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Best .300 Blackout BLK Ammo: Self Defense, Hunting, Target

My .300 Blackout HD Pistol
.300 AAC Blackout ammo comes in lots of flavors from training to home defense to hunting, we took a look at the whole range of ammo and picked out our top favorites for each type so that you can save time and money!
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    Updated Feb. 2024: Added US Cartridge FMJ, AAC Ammunition Black Tip & FMJ

    What fails faster than me trying not to eat Taco Bell when I’m trying to lose weight?

    Completely new rounds.

    Seriously, every year we get a new round that’s been declared the latest and greatest.

    Subsonic .300 Blackout
    Subsonic .300 Blackout

    One round that hasn’t failed is the .300 BLK. In fact, it’s simply grown and grown in popularity.

    Here’s what we have found for ammo that is in stock:

    .300 BLK Ammo in Stock

    Deal
    Grain
    Cost Per Round
    Notes
    Assorted
    $0.60
    Assorted
    $0.70+
    125gr OTM
    $0.90
    CYBERMONDAY 8% off, Free Ship $149+
    AAC
    220gr OTM
    $0.80
    90gr Hollow Point
    $2.25
    CYBERMONDAY 8% off, Free Ship $149+

    For more specific .300 Blackout ammo, check out Palmetto State Armory and True Shot Gun Club.

    For the most up-to-date ammo info for all other calibers…check out our Best Places to Buy Ammo Online article.

    Lots of Ammo
    Lots of Ammo

    If you don’t have time for the details, here are our top picks for best .300 Blackout Ammo:

    As the shooting industry was beginning to lean towards short rifles and suppressors – the .300 BLK just so happened to be designed for short-barreled rifles, equipped with suppressors.

    It was one of those moments where everything collided just perfectly.

    Emp New Groove Just Right
    When the ammo is just right…

    While initially designed for a military RFI (Rapid Fielding Initiative) the civilian market accepted it quickly.

    .300 BLK functions perfectly in an AR-15 platform with hardly any changes, this makes it inexpensive to adopt and easy to test out. 

    So what about ammo?

    .300 BLK vs 7.62x39mm
    .300 BLK vs 7.62x39mm

    If you have a .300 BLK, you need to feed it, right? We’ve put together some of the best ammo on the market.

    Given the fact this is such a versatile round, we’ve broken up our choices by end purpose.

    THE QUICK LIST

    Table of Contents

    Loading…

    How We Chose the Best .300 BLK Ammo

    The entire team at Pew Pew Tactical had a hand in contributing to this post. Most of us have a .300 BLK rifle in some variation and know a thing or two about what kind of ammo you need to achieve your goals — be it training, home defense, or hunting.

    PPT Team Staff
    The Pew Pew Tactical team at the range

    We constantly test ammo and regularly update articles as new ones become available, so if you’re favorite isn’t here, check back soon!

    Best .300 Blackout Ammo

    1. US Cartridge

    Best Plinking Ammo
    $130
    at Ammunition Depot

    Prices accurate at time of writing

    Prices accurate at time of writing

    Available Coupons

    Pros

    • Slightly more affordable
    • Good for plinking

    Cons

    • Purely for plinking

    When it comes to purely plinking, you want something that will perform at the range without totally breaking the bank. Though .300 BLK has gotten a bit more affordable at the range, it’s still not as cheap at 5.56 and 7.62.

    That’s why we suggest buying in bulk to keep the cost per round down. For that, we go with US Cartridge. You can get 200 rounds of 147-grain for a reasonable $135 – not bad if you’re doing training at the range.

    It’s basic ammo, designed to function reliably. It flies at 1,886 feet per second and offers consistent primers.

    We wouldn’t take this out hunting, but if you need to sight in some rifles, accomplish some training, or just want to unleash lead on the range, this is the most affordable way to do it.

    2. Sellier and Bellot

    Pros

    • Subsonic
    • Great for suppressors

    Cons

    • May be a little dirty when fired

    One of the best things about the .300 BLK round is the fact it’s superbly versatile. The rounds can range greatly in weight from light 90-grain supersonic loads to 220-grain subsonic baseball bats.

    When it comes to a suppressor, slower is better. A subsonic round lacks that supersonic crack. Suppressors only stop the blast at the muzzle end of the gun — they do nothing for the supersonic crack.

    .30 Cal and 5.56 Suppressors
    .30 Cal and 5.56 Suppressors

    A subsonic load through a suppressor is nice and quiet. Nowhere near movie quiet, but quiet enough to be hearing safe.

    One solid subsonic load for the suppressor enthusiast is the Sellier and Bellot 200-grain FMJs.

    These are on the lighter side of subsonic loads, so they move a little faster than the 220 grains, and this translates into a little extra energy.

    The lighter loads are chugging along at only 1,060 feet per second.

    Swap in a magazine full of supersonics, and bam, you got your long-range performance back at the sacrifice of getting a little louder.

    3. Barnes Vor-Tx

    Pros

    • Good for hunting
    • Premium ammo

    Cons

    • Pricey

    I personally hunt with an AR-15 and don’t see an issue with it, but the .300 BLK has found its way into guns like the Ruger American Rifle.

    It’s a great hunting cartridge and can be used both in a suppressed platform and a loud platform.

    The only thing you need to consider when using .300 BLK to hunt with is that it offers a limited range…200 yards for supersonic ammo and 150 yards or less for subsonic ammo.

    When it comes to hunting, I’d stick with a supersonic cartridge. They fly further, hit harder, and are much more capable of quickly harvesting your game of choice.

    There are a number of different hunting cartridges out there, but one that’s proven is from Barnes.

    Barnes is a premium ammo, and it comes at a premium price, but the payoff is ethical hunting, and that makes it worth the extra cents.

    4. Federal Premium Power-Shok .300 AAC Blackout 150 grain 

    Available Coupons

    Pros

    • Works on a variety of game
    • Reliable and consistent

    Cons

    • Not the best for longer range shooting

    Another decent hunting round to consider is Federal’s Power-Shok. This 150-grain soft point features a muzzle velocity of 1,900 fps.

    In short, it packs the punch you need to bring your chosen game down.

    This reliable round is consistent – which is everything when it comes to hunting.

    You don’t want to guess whether your ammo is going to perform like you need it. Not to mention, we believe in ethical hunting around here, so we chose rounds we know will be both humane and effective.

    Federal answers that call.

    5. Fiocchi 125-Grain .300 BLK

    Pros

    • Best for home defense
    • Controlled expansion

    Cons

    • Out of stock a lot so availability could be a problem

    A suppressed, short-barreled rifle is a mighty good home defense device. Even if you subtract the short-barreled part, a semi-automatic rifle is a helluva way to deal with things that go bump in the night.

    For this, the Fiocchi load is perfect. This is a brass-cased premium round loaded with a projectile from Hornady.

    The projectile is a Super Shock Tip projectile, reaching 2,200 feet per second. It’s designed to deliver controlled expansion at high velocities.

    A lot of times, a company hypes its ammo a bit; what I like about the Fiocchi SST is that it actually has some solid reasons backing it up:

    • SST projectile expands on contact and penetrates with near-reckless abandon
    • Hornady’s Interlock ring keeps the copper jacket and leads internals together, allowing for excellent weight retention and penetration without over-penetration

    6. Hornady .300 BLK 125gr HP

    Runner-Up Home Defense
    $69
    at Brownells

    Prices accurate at time of writing

    Prices accurate at time of writing

    Available Coupons

    Pros

    • Great performance
    • High quality brass and primers

    Cons

    • Pricey

    The folks at Hornady have been in the ammunition game since the late 1940s, meaning they know a thing or two about what works and what doesn’t.

    Hornady’s .300 BLK 125-grain HP offering brings a quality option for those looking for a defensive-style round.

    Not to mention, even amid an ammo shortage, we’ve seen this on shelves more often than not.

    The company equips its rounds with high-quality brass and primers, so you can expect to get a solid performer that won’t let you down.

    These rounds bring a velocity of 2,175 fps with muzzle energy at 1,1313 foot-pounds.

    7. AAC Sabre Blade Black Tip 125gr & FMJ 150gr

    Best Home Defense
    $12
    at Palmetto State Armory

    Prices accurate at time of writing

    Prices accurate at time of writing

    Available Coupons

    Pros

    • 2,175 FPS
    • Great for home defense

    Cons

    • Best out of a 12"+ barrel

    Last but certainly not least, AAC brings two .300 BLK rounds we think are worthy of some attention.

    First up is the Sabre Blade Black Tip. This is a 125-grain round designed with self-defense in mind. Using Sabre Blade Black Tip bullets, the round looks to offer maximum expansion and weight retention.

    AAC .300 BLK BLADE Black Tip 125gr

    The brass is fully reloadable, so if you’re into that sort of thing, that option is definitely on the table. Velocity-wise, the Blade pushes 2,175 FPS. In our testing, we found it fed reliably and performed well.

    If you’re after a simple range FMJ, though, we recommend the AAC 150-grain FMJ.

    $12
    at Palmetto State Armory

    Prices accurate at time of writing

    Prices accurate at time of writing

    Available Coupons

    This one is a basic, no-fuss round perfect for days at the range or training. It pushes out a velocity of 1,900 FPS, and the FMJ bullet is great for getting those training reps in.

    Again, brass is fully reloadable, and we’ve had no issues while testing this one out, either.

    AAC .300BLK 150gr FMJ

    Final Thoughts

    The .300 BLK is a modern little cartridge that absolutely rules the 0-300-yard range. It’s potent, powerful, versatile, and popular enough to give you a wide selection of rifles to choose from.

    DDM4 300 Blk ADS

    You can do a lot with a .300 BLK rifle, and the task you choose is going to determine the ammo you need.

    Let us know in the comments what your favorite .300 BLK ammo is and why! If you’re looking to build a .300 BLK rifle for yourself, take a look at our top picks for .300 BLK Uppers!

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    31 Leave a Reply

    • JRB

      My experience of Sabre was negative out of a 9 inch barrel with continual failure to eject.

      October 1, 2024 9:42 pm
    • Randall

      Earlier this year I did chronograph and gel block testing on about 12 types of 300 blackout ammo, both from my 5.5 inch Sig Rattler, and my 16 inch IWI Tavor. I almost exclusively used supersonic ammo for these tests as subsonic was too similar to handgun rounds in terms of ballistic energy, although the bullets are more aerodynamic.

      In terms of the muzzle velocity in chronograph testing, the longer barrel typically got 400 to 500 fps better muzzle velocity, which you'd expect to see in 16 inch barrel vs 5.5 inches.

      As far as gel block testing goes, most of the hollow points behaved pretty similar to each other, with the exception of the Controlled Chaos bullets from Lehigh and Underwood. Those had massively larger wound channel due to some of the petals consisterly breaking off. Unlike the Liberty Ammunition pistol rounds that explode on contact but have petals only penetrating 4 to 6 inches deep in ballistic gel, the Controlled Chaos 300 blackout rounds consistently had their petals penetrating 9 to 12 inches deep, and creating tracks that were usually the full 6 inch width of the gel block. To me that was hands down the best round to use for home defense, and I assume it would do well for hunting, except maybe not penetrate enough against really thick hide animals. It also had its core piece consistently penetrate 18 to 22 inches in gel block, while many other hollow points would hit 24 to 28 inches deep and likely a little higher risk for over penetration. The Fort Scott TUI rounds also create pretty wicked overall wound channels with wider tracks at deeper depths than most due to their tumbling, but they also frequently penetrated over 32 inches, so they're definitely a risk of over penetrating in an urban home defense setting, but might do well for hunting tougher animals.

      Almost all rounds did perform better with the added velocity of the 16 inch IWI barrel, but the 5.5 inch Rattler was still enough to get good enough expansion, except with the Sig Elite Hunting round. That one did not expand at all from the Rattler.

      I also tried shooting through level 3A soft and hard armor plates, the only round that didn't pretty easily get through from either the IWI or Rattler was a 150 grain Precision One hollow point. The Controlled Chaos left pretty nasty wound channels even through 3A armor, especially from the longer IWI barrel, while some of the other hollow points left pretty mild channels after slowing down from penetrating the armor. I expect basically any supersonic round should get through 3A armor. I tried shooting some through level 3 steel plate and none of them came remotely close to penetrating that, so don't expect to defeat heavier armor. Almost all the rounds penetrated through four 2x6 wood boards (shooting through the 2 inch direction on each), so they could definitely go through the walls of your house if you miss, but they won't go overly far after, so only your next door neighbor would probably be in danger in a typical neighborhood.

      Long winded reply, but just wanted to share my testing results from earlier this year. Again based on all my testing, I will primarily keep the Controlled Chaos rounds loaded for home defense as they were far and away the most effective round in gel blocks, they defeat 3A armor, and are slightly less risk of over penetrating vs most others. There was little difference between the Lehigh vs Underwood variety. I'll also keep some of the Fort Scott in case a scenario arises where I need better penetration.

      May 31, 2024 4:46 pm
    • David

      Huge fan of Gorilla Ammo.

      November 22, 2022 8:17 pm
    • Mark

      Big fan of the Hornady 190g Sub-X. I've been handloading them with CFE BLK powder to get 1000fps, 1" groups at 50yds.

      July 21, 2022 5:12 pm
    • Bemused Berserker

      My first build was a .300 AAC AR Pistol with an 11" barrel. It's my Home Defense AR. I enjoy shooting it more than 5.56. I've used the Fiocci and Hornady 123 gr's, and reload with Hornady's 123 gr bullets (saves a few bucks per box). In the process of building a 2nd .300 with a 16" barrel to see how it compares to my 5.56 rifles. Retired, so it takes me a bit to get all the parts together on a fixed income.
      I'd love to get a suppressor, but I refuse to pay $200 to A$$holes Taking Firearms for "permission." F that and F them. I'll do without.

      July 21, 2022 5:08 pm
      • STL6s

        8.5” PSA with an Aero Precision Lahar K with a Vortex 1-8x24 Strike Eagle. Barnes 110 gr VOR-TX Blacktip, absolutely deadly on whitetails to 150 yds. Measured velocity using a Garmin Xero C1 Pro for a 5 shot average was 2186 fps for the 8.5” barrel. This is about the best 300 hunting ammo there is out there. Price shouldn’t matter for one shot ethical kills and nontoxic to the environment to boot. Broadside shots are nearly always pass throughs with massive internal damage. Right shot placement, DRT. Very lightweight, maneuverable platform for hunting. Great kids rig cause the adjustability of the brace, light recoil and muzzle blast and hearing safe with supers. Will stack Blacktips at 50 yards. Ya don’t need a magnum to take whitetails cleanly out to 150.

        I agree completely with BB. The Fed regs on suppressors are ridiculous, oppressive and relic from the gangster era. We gotta get this changed, somehow. Every firearm should be capable of being legally and easily suppressed, including shotguns.

        February 5, 2024 9:07 am
        • Hertervillian

          Saved me a bunch of typing! However I’ve made the extortion payment. I’ve spent more to get less enjoyment. Maybe the kids hearing will last longer than mine.

          May 4, 2024 9:50 am
    • Roy

      I just bought an Aero Precision .300 pistol with an 8" barrel. I plan to buy a suppressor for it soon. This will be a home defense gun. Is it possible to use the same self defense ammo for suppressed and non suppressed?

      February 22, 2022 4:26 pm
    • Jerry

      You will have to let me know what SBR gets 2200 FPS with a 125 grain bullet. Would that be a 16” SBR?

      August 23, 2021 4:44 pm
    • David Hochstetler

      I’ve tried using that Fiocchi on deer in south Texas out of a 16” barrel. Zero expansion on thin skinned animals. It’s probably the most consistently accurate ammo I’ve ever used but I won’t use it for hunting deer or home defense. On hogs it’s an absolute beast.

      February 1, 2021 3:24 pm
      • Jason Parsons

        Great comment! Appreciate you taking the time to make it.

        June 10, 2021 9:44 am
    • Tom

      Any runner up home defense options since Fiocchi is sold out literally everywhere? Would the plinking rounds suffice?

      September 19, 2020 4:15 pm
      • ENIGMA6

        Hornady with the same bullet. Check gunbroker for currently available ammo, then daily for new offerings. You can filter what is shown by new within 24 hours, 48 hours, currently active, and price. Be prepared to pay $2-3.00 a round, perhaps more for specialty ammo like Lehigh. Try to snag brand name new 300 aac/Blackout cases by a reputable manufacturer like Norma, Remington, Winchester, Speer, etc. Get some dies (preferably small base with taper crimp.) You can add a cannelure if desired. , primers, and what ever bullets you prefer. Cases will run 50¢ to $1 each. Bullets $1.00 or so, perhaps more depending on design. Follow your reloading manual. I prefer to run the 110-125gr around 2250-2300 if no pressure signs appear. If using short barrels, use faster burning powders. It isn't cheap to roll your own at present, but it helps with availability.

        October 10, 2020 6:52 pm
    • Terry S

      Have a question that wasn't really covered in the article, I’m looking to build a .300 blackout pistol AR with a 7.5 barrel... I’m going with the .300 for this because it performs better in a shorter barrel. Gun is going to be range toy and HD. I will be looking to go suppressed but that is a long way down the road. So 1: firing a 7.5 300 blackout in an indoor range... what ammo would work best as so I’m not flash banging myself?

      June 28, 2020 7:43 am
      • Ben

        The reason it works better than 5.46 in a shorter barrel is because the volume and burn rate of the propellant used in .300 BLK is intended to burn quickly and efficiently within the first 9” or so of barrel so you probably won’t get an amazing muzzle blast from any loading. However, the heavier bullets are longer and take up even more space inside the cartridge case, leaving even less room for propellant, so if you want the absolute minimum muzzle blast/flash from your unsuppressed shorty then get the heaviest subsonic ammo you can find.

        July 17, 2020 10:31 am
      • David

        The shorter barrels are flame throwers. I do have a coworker at the range I work at that installed a Witt machine SME muzzle break. The flip, sound, and flames were greatly reduced.

        November 10, 2021 2:29 pm
    • Patrick O Davidson

      Checkout out Discreet Ballistics.... they specialize in subsonic rounds for hunting and home defense. They even have a target round to help zero and practice with your rifle. When you order they even ask for barrel length and twist to make sure they get you the proper round

      June 24, 2020 3:34 pm
    • J

      I’m confused. For home defense you start by saying a short, suppressed .300 BO is great for home defense (agreed). You even include a picture of 2 suppressed rifles in the section. Then you state the Fiocchi SST 125gr is a perfect round for defense after just explaining in section 2 that supersonic ammo is eneffective at staying suppressed because of breaking the sound barrier. Are you assuming that even though supersonic, it wouldn’t reach those velocities in the close confines of a home defense situation or something? The holy grail round for self defense .300 BO seems to be 1) subsonic so quiet, 2) expanding (at subsonic speeds) so no over penetration yet is still a one shot threat reliever and maybe 3) costs less than $1 every time you need to take a shot. Honestly most people will settle for 1 and 2. You really don’t need high velocity, long distance accuracy when the largest open space in your house is 30-40 ft. Despite the confusion I do appreciate the article because it was quick and helpful but still searching for the holy grail. Thanks!

      December 9, 2019 8:51 am
      • Cameron

        I didn't read the subsonic part here b/c it's not what I was looking for, but I assume his point is that subsonic 300 isn't ideal for defense, it's ideal for being quiet. Once 300AAC is going subsonic it's not really a rifle round anymore it's a handgun round, ballistically similar to subsonic 45ACP. You don't get the hydrostatic shock, the round has to be going 1800-2000+ fps. Also rounds need to be supersonic and then some to penetrate cheap 3A soft armor reliably, which has become more common in home invasions, which is when you're most likely to need a HD rifle.

        There's been a lot of back and forth on this over the years, and it's not like subsonic 300 is BAD, some people want lower sound over actual fight stopper, especially since most bad guys run away after getting shot at anyway. Still if I were building a subsonic AR today, it'd probably be a 9mm shooting 147gr HST out of a super short 5"-6" barrel with a 9mm suppressor. I kinda wanna build one as a small persons/first timers rifle anyway, light shooting and suppressed makes for a good intro.

        May 28, 2020 7:46 am
        • Javier Rojas

          I know there are lots of opinions about home defense, and all are respectable.
          My thoughts:
          1.- The louder my gun, the better, as I would want all my neighbors to know something bad is happening. Anyway, suppressors are illegal where I live.
          2.- The heavier and most expansive my bullets, the better. The sonic or subsonic part of the equation has nothing to do in the decision.
          3.- The less penetration my bullets have, the better. I'm hoping not to confront armored assassins, and at least I'm pretty good at going for head shots.
          4.- #s 2 and 3 above is why I'm betting on medium to heavy .300BLK bullets vs. 5.56, but still haven't decided on what grainage to use for hollowpoint bullets.
          Any suggestions will be appreciated.

          March 8, 2023 1:57 pm
      • Tyson

        The speed of the bullet is determined at exit of from barrel so size of house plays no factor in sub vs super. Expansion without over penetration is king for home defense, speed is critical for expansion. Yes you are correct that common sense says quiet in home defense would be awesome but reality is suppressed supersonic blackout is tolerable without ear protection and expansion is more important than a little ear irritating. Hunting is all about quiet because of follow up shots and not spooking other animals or neighbors is king.

        September 5, 2020 5:34 pm
      • Twilla Garrett

        Get some 200-220 grain for home defense..hollow point if you can find them
        Sig sauer 120 grain elite all copper are great on hogs and deer.
        I keep my shots within 200 yards

        January 13, 2022 6:30 pm
    • Douglas

      I built two 10 1/2 Daniel Defense barrels. I have been shooting Sellier and Bellot 200hrs full metal jacket subsonic. I tried to abbreviate but system changed it to CNN. Queer Don't you think.

      October 16, 2019 9:51 am
    • Craig

      Ok, I'm perfectly clear on the self defense rounds. Not really. I saw the Lucky Gunner gel test of handgun ammo, but sadly haven't seen a rifle equivalent. I get the concept of over penetration, but again I do not see actual tests demonstrating that concept with data that I can use for an informed decision. Plenty of personal experience and learned wisdom out there though.

      I can see the logic in a handgun for close range, but from close range to 100 or 150 yards is that a shotgun or 300blk, or 5.56, or something else.

      March 30, 2019 9:01 am
    • Tyran Mayberry

      Out of all the sub loads for 300 BLK what are the top 10 or 5 with the quietest sound and can be fired without a suppressor and will load properly in a ar pistol. Same goes for 9mm in ar pistol platform n glock, .45 acp in ar pistol platform, n 5.7 in ar pistol platform and fn pistol.

      January 26, 2019 3:31 pm
      • Joshua Cappuccilli

        Without a silencer there is still going to be considerable noise even from subsonic rounds. I thought i could shoot my surpressed 22 (10/22) in my back yard but after two shots of powderless subsonic rounds it became evident the neighbors would notice in short order. Silencers (like the inventor called them) or suppressors do NOT make your weapon a little poof poof gun. Subsonic rounds without a silencer will obviously still be load enough to hurt your ears. A standar 1911 in 45 acp is sunsonic but loaud as fuck without hearing protection.

        June 17, 2020 9:19 pm
    • Taragis

      I use CZ 7.62x39 carbine and Ruger Scout .308 to hunt deer and hogs. Two years ago I bought a Ruger American Ranch in 300 Blackout and learned to love the caliber. I even built an AR with 16” barrel around that caliber. I get consistent devastating result using the all copper Sig Elite 120gr HT hunting ammo at less than 100 yards. Hearts turned to mush. Couple times I used a Remington 120gr OTFB with Barnes casing on hogs. Result was great. Will try the Fiocchi SST on my next outing.

      November 23, 2018 6:24 am
      • Twilla Garrett

        Sig 120 grain elite is a great round

        January 13, 2022 6:32 pm
    • I Love Freedom

      I never wanted an AR-15 until larger calibers started being produced for the rifle. 6.8 x 43 and 6.5 x 39 Grendel rounds were great but I love and currently own a .300 AAC Blackout rifle. It uses magazines that feed the standard 5.56 x 45 round and I use 123 grain rifle rounds with it. (If you are using supersonic rifle rounds I recommend 110 to 125 grain rifle rounds.)

      I believe the rifle to be really effective to about 230 yards using a 16 inch barrel. After 275 yards the bullet drop is about ten inches and at 325 yards that increases to about twenty inches. As long as 7.62 x 39 and 5.56 x 45 rounds are around .300 AAC Blackout will be around as this cartridge is assembled using a 5.56 x 45 casing and 7.62 x 39 bullets.

      Maximum effective range using supersonic 125 to 110 grain rifle rounds is about 440 yards (but bullet drop is around 57 inches at this range).

      November 20, 2018 9:00 pm
      • Randall Thompson

        Wrong. The 7.62x39 uses a .311 diameter bullet while the .300 Blackout utilizes .308 diameter bullets. Size matters, dude.

        January 13, 2020 10:06 am
      • Keith P.

        My experience has been that standard 5.56 mags (specifically, Magpul Gen 3 windowed P-mags) are NOT ideal for 300 blackout, because ribs in the magazine brush against the larger shoulder of the bullet, and cause failures to feed. I had to get mags that are designed specifically for 300 blackout for reliable feeding. The internal specs for every mag are a little different, so your mags may feed them fine. But mine didn't.

        June 9, 2022 10:57 am
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