Cartridge: .300 AAC Blackout


  If anyone has flipped through an American shooting magazine, you will have noticed that the yanks sure do love their AR-15 based semi-auto’s. And in all honesty, why shouldn’t they? It’s a reliable platform that has been highly appreciated by American troops since they were first carried into Vietnam. Although there were a few problems with early production guns, over the years they have been modified into the futuristic weapons that we see advertised today. The Americans use their AR-15’s for everything from home defence to competition shooting and it’s this varied use that has led the development of a few new cartridges along the way.

 The .300 Blackout is the newest cartridge and perhaps the most appealing. The .300 Blackout (300BLK) has been specifically developed for use in AR based platforms with only minimal amount of modifications. There is no need for change to the magazine and capacity is the same as its original cartridge the 5.56x45mm or the .223 Remington. The bolt face also remains the same and the only required modification is the barrel itself. So, the cartridge has been successful in its suitability for the AR platform, but how does it preform?

 Users of either 30/30 Winchester or the 7.62×39 Military cartridges aren’t going to notice any difference in terms of real world performance. With the choice or either sub or supersonics loads, the cartridge has a lot in common with the .300 Whisper. In fact, Remington is so sure of its success that they have brought out factory ammunition suited to both hunting and target type applications.

 There has been (and always will be) a lot of debate in Australia as to whether or not we should be allowed to own semi-automatic firearms. Personally, I can see a lot of potential for hunting and competition uses. Few could argue the effectiveness of a semi-automatic when it comes to eradicating mobs of feral pigs.

 I don’t have enough room here to cover all the information available on the .300 BLK. The below link has everything covered and is definitely worth a read.



24 thoughts on “Cartridge: .300 AAC Blackout”

  1. Jason that was a well written and very interesting article. BUT…
    America is an entirely different place to Australia. While we enjoy similar culture. Things are different here. I don’t see anything to be gained by pushing for firearms which look like “Assault rifles”. Many of the police force are keen hunters and we should support them. In NSW a firearm that resembles an assault rifle even if it is a single shot is illegal. in Victoria it is an instant capital punishment if you point one at a police man. I thought it a dumb move importing those Simonov SKK & SKs. They were poor quality and the prime reason I lost my Garand and later my 4 shot Remington 740. Sounds like a contradiction? No way; my local police sergeant was very apologetic about the latter saying that it was obviously a hunting rifle and of no obvious threat. The Garand was well known as a World war II infantry Rifle and very heavy; it did not look like a “machine gun”. War weapons frighten the public. The Newspapers especially our arch enemy the “Telegraph” like to frightening the public. It is wise not to feed their frenzy. We are far better off pushing against the stupid paperwork. All of the Hoo Haa about the incredible “tactical weapons” has already frightened the Police Commissioners in all of the States. I have seen little in this “tactical” craze that helps hunters. It might impress the “toy soldiers” but it does not impress me. It has endangered the legal status of many real hunting rifles that belong to the “grownups”. Bolt action 338Win rifles for example. My firearms are for hunting and for paper/clay target shooting that’s all. I sometimes wonder about the sense of some importers. The imports of the Russian AKK burp guns probably sent a lot of our hunting shops broke. Think about it.

  2. The ARs have never been on our civil register. I have nothing against any of the semi auto’s EXCEPT the ones that frighten our wives , the ones that frighten the police, police commissioners, and 95% of politicians. I would love to be able to use a .22Lr Semi autos. They were great when shooting rabbits. I liked the semi auto shotguns for shooting ducks. Less important was the semi auto centrefires. The ARs do not belong in our political climate. You are very naive if you think that any ruling party is going to allow such firearms except for military, police, and official parks and wild life bodies for helicopter culling. Ordinary hunters should forget it. Fight for some goals that we can win. See the PETA article.

  3. You are right Jack in the fact we’ll never see ARs in Australia and I am sure Jason knows this.
    That said I fail to see why law abiding shooters can’t have one!
    I also would not be willing to throw any discipline or firearm type under the bus to appease politicians and anti-gunners. If you give them one type
    Of firearm they will want another and another.
    I am certain that we won’t ever see private ownership of semi auto centre fires in this country but I won’t change the desire to own an AR-15 or any other gun to appease the anti’s as they want ALL guns banned!

    Shooters shouldn’t throw one another under the bus because we don’t use a particular firearm type.

    With that said a Remington 7615 would only need a new barrel. Does anyone know if they are able to have the barrel replaced? I have 0 experience with the platform.

  4. My second comment was mainly in reply to “andrewk”. I have no criticism with the article which I found very interesting. We need to separate our hearts from our heads. There is a very big difference between fighting against the thin edge of the wedge and making ambit claims. The organisations that fight for us including sites like this one, Bob Katter’s new party in Qld and the Fishers and Shooter’s party in NSW; are not going to push for introduction of fully automatic firearms, bazookas or AR15s. They are far too sensible. They will fight tooth and nail to maintain ownership and purchasing rights to what was legal post 1996.
    “What’s it good for”- Elmer Keith said when Remington brought out their 8mmMag cartridge.
    I am a compulsive “wildcater”(articles to come)but I ask what can this cartridge do for me?
    Keith (our’s) mentions an excellent firearm in the Rem pump 223. I think that practically speaking rebarreling to this new cartridge would be a very retrograde step. Select handloads of the 223 would be far more useful. Try the 64g Win powerpoint if you have a 10″or shorter twist or 70g Speers if you have a 12″. There are no flies on the Rem 760 in 243. I use a Rem 760 in 308Win (another article to come) which is much cheaper to buy and to provide ammo for. It also responds very well to reduced loads. I was never impressed with the M1 carbine.
    But I still loved the story.

  5. Jack,
    Savage has committed a bolt actioned rifle to it. The 300AAC is interesting in that it offers memories of the long forgotten 30Myra. Cheers…

  6. Jason,
    Savage configuration is allegedly follows:



  7. Jason and Con; The Savage Model10 is an excellent bolt action rifle.I have one with two barrels in 338Win Mag and in 7mm Mashburn super magnum (7×67). The the nut that adjusts the head space on the barrel of the Savage 110 makes it amenable to switching barrels; an idea I got from Dal Birrel. We could then apply Keith’s idea of rebarreling a 223 with the advantage of being able to switch back. I wonder if Savage has thought of that? I have a savage Model99 in 308Win which is an excellent rifle for goats to sambar. Jason where do you see the 300ACC being used? Target shooting with military calibres? Shooting pigs from helicopters? Youth and ladies deer rifle?
    You have got me interested?

  8. Jack,
    Limited application in Australia for sure. But a handy little gun for pigs/goats out to maybe 150yards? Interesting little case for a 30cal varminter (short range) using say a 110gr V-Max. If it had a longer neck it’d also be interesting as a short range cast bullet shooter … I dont think anyone in Australia officially shoots cast benchrest.

    I bet though that it sees a run as a Silhoette pistol chambering which seems a natural for it.

  9. Good thinking Con. There are some excellent little single shot rifles which would accept this “fun” cartridge. In such a rifle it could be a substitute for a pistol; for those who want a bit more of a challenge to their pig shooting. In anything other than a factory rifle I do not see much economy in it. The novelty value is very high, which is what we were all thinking about. I’d be very interested to see what my old mate John Robinson has to say about it in “Gun’s Australia”.

  10. Here is something straight out of the WIKI: “The Federal Government continues to be involved in adding or adjusting restrictions via the Attorney-General’s Department, using the Customs power and consultation with States. Examples include proposed importation bans on calibres used for long range sniping such as the .50 BMG, .416 Barrett and .338 Lapua Magnum; large capacity magazines; stocks and parts for various categories of firearms; and controls affecting participants in international competitions. A Firearms and Weapons Policy Working Group (FWPWG) operates across government bodies and input of major stakeholder groups is enabled at national level via the Commonwealth Firearms Advisory Council (CFAC) and occasional public consultation on proposed changes.”

  11. If I recall correctly, some disabled dude got an AR-15 or something like that and shot up a bunch of people. He was also dumb as a brick.

    Maybe we could humanely cull the idiots from society? It would do us all a favour.

  12. ” Russ Crane prefers it that way. Crane is not his real name. He wants to remain obscure. He is an experienced military sniper, a serious man in a serious profession that, however, excites a fringe of pretenders and psychopaths.He knows those people are out there. They inhabit gun shows, firing ranges, and war-porn recesses of the Internet; they have a poor idea of how real snipers do their work, or of its effect upon their lives.”
    That quote comes from an earlier article on this site and highlights why the police are very worried about the wave of interest in things “tactical”.

  13. I really like the look of the Savage 10 precision carbine chambered in 300 BLK. Most of the shooting i do at the moment is with a 308win loaded down to subsonic. Many ask why on earth….. i answer it quiet and relatively no recoil. Very effective on goats out to 150m.
    The 300 BLK (and 300 whisper) are great for those of us that like to keep noise down and get a feed. There is some great info about this cartridge on AAC’s web page. I hope more rifles become available in 300 blk soon.

  14. 1 in 7 twist with a 16.5 inch barrel. Muzzle threaded (not likely in Aussie) Xmark Pro trigger and a hogue ghilli green stock. Thats as much as I can find on it atm. Will be interesting to see if it makes it to our shores.

  15. Sounds great, I reckon it’d be just the thing for me.
    Do you know what twist rate the savage precision carbine 300blk has?
    I couldnt find it mentioned on their website? Regards, Andy

  16. Wow, Australians can’t open semi auto centerfire weapons? I’m curious how you would protect yourselves under the threat of invasion or in a situation of civil unrest or even civil war. In America, the founders did not guaruntee the right to bear arms for the purposes of hunting or even specifically self protection. The real reason is so that the government will fear the consequences of mistreating its people. It is in the constitution so that the citizens can get rid of their current government if they feel the need. (To be honest I wouldn’t be surprised if that happens here in the next hundred years.) My question is this; I don’t claim to no Australia’s history but I would bet that your country had to fight for its freedom at some point in time. In modern times, how would your citizens fight for their freedom if needed against an armed military? Of course the military will have superior weapons and training. However, here in America there are enough civilians with guns that we could collectively relieve our current politicians of their duties. How would Australians do that with only single action weapons?

  17. Keith, I have a 7615P in 300BLK. It is a simple job to get a barrel extention from Lumley arms and then fit a barrel as required. I now have a takedown switch barrel 7615 gotta love that!

  18. Keith, I have a 7615P in 300BLK. It is a simple job to get a barrel extention from Lumley arms and then fit a barrel as required. I now have a takedown switch barrel 7615 gotta love that!


    Where did you source the 300BLK barrel?

  19. Hi Steve,

    Been watching the conversation with interest. I would also like to know where you sourced the barrel? I have just ordered the Lumley Arms extention and the next step is try to locate a barrel blank or have one made by a competent gunsmith in SE Qld? Any suggestions or advice would be most helpful! Thinking 16 inch with 1/7 twist rate for 220gr subsonic factory loads?


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