The 7.62X39 seems to be within about 5% power wise of the 300 AAC. With all of the options available in the market when it comes to 7.62X39, is it ever going to be worth going over to the 300 AAC? Is there something magic about the 300 AAC?
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The 7.62X39 seems to be within about 5% power wise of the 300 AAC. With all of the options available in the market when it comes to 7.62X39, is it ever going to be worth going over to the 300 AAC? Is there something magic about the 300 AAC?
To me, it seems the "magic" of the 300 blackout round is that you get a .30 caliber round out of your AR, and all you need is a new barrel. Existing BCG, magazines, etc. already work, for a round that (again, from what I have READ) is supposed to improve CQB lethality of the AR platform.
I like the .30 cal round , and I've got a Colt 7.62X39 upper. I was just wondering about the 300 AAC.
There are issues feeding the 7.62x39 round into an AR upper. The 300 BLK does not have these issues, can be used with only a barrel swap, and is SAAMI standardized.
In terms of power they are similar.
The advantage of the 300 BLK is:
- Developed for the AR system- in terms of fit and cycling
- Factory ammo fits 30 rounds in standard 30-round 5.56 mags with no mods (including GI mags, PMags, etc)
- Case head the same as 5.56, taper the same as 5.56 (not as angled as 762x39)
- Uses a standard 5.56 AR bolt, carrier, etc
- ONLY change needed to a 5.56 gun is the barrel
Plus, the 300 BLK uses .308 caliber bullets which makes variety and availability very good for reloaders, unlike with 762x39.
And part of the development for 300 BLK included reliable and safe subsonic options for real quiet suppressed operation. That is another nice option.
Todd from Noveske choreographed the 123 grain Remington ammo as 2345 fps from a 16 inch Noveske barrel. One of our customers got 2360 average from an AAC Model-7 barrel. Both of these are higher than what Remington claims - but we wanted to publish a spec that was conservative and was easily made by the shipping product.
7.62x39mm, averaging some data I saw posted around the interweb, is about 2250 fps from a 16 inch barrel. I know the spec for 7.62x39 is supposed to be faster than that, but it seems to be loaded mildly in practice.
Where the 7.62x39 wins is available ammunition, and price of ammo. If you've seen a PWS Diablo in 7.62x39 run in F/A then you know feeding issues can be resolved. When loaded brass cased ammunition comes down to $0.30/rd I'll throw my x39 barrels out the window and get 2 blackout barrels to replace it. Until then, I'll happily enjoy shooting my 7.62x39 uppers for $5.00/20rds in brass cases :D
$5?
It seems to be more like $13.79 for imported and $16 for USA.
http://www.midwayusa.com/viewProduct...tNumber=373939
http://www.midwayusa.com/viewProduct...tNumber=883096
Come on, now.
http://gun-deals.com/ammo.php?caliber=7.62x39
That helped me find $10.99:
http://www.cabelas.com/product/MFS-2...h-All+Products
I recall seeing numerous cases of 762x39 at $200-220 at the last Chantilly gun show.
Don't get me wrong- 300AAC looks like a promising round and I'd love to have one but you need massive economies of scale to make a round affordable to shoot. 762x39, 9mm, 5.56, 22LR, etc. It's a bit of a chicken vs egg paradox
Neat site. Basically it is telling me that 223 or 5.56mm I would buy begins at 31 cents a round. It also has 300 Whisper(R):
http://www.ammoengine.com/find/ammo/.300_Whisper
Instead of fighting over who can find the cheapest 7.62x39, why don't we concentrate on the 300AAC. Sounds like a great cartridge. Now if we can just find some affordable ammo, maybe some MFG's will start to produce some uppers (BCM).
Yugo Milsurp M67. $3.29/15rds.
I really love the idea of the 300BLK and will be building an upper in it....someday.....
To me the attraction is also a simple barrel replacement.
Same bolt, same mags without loss of capacity.
The down side is the ammo price.
But, for me it's something I would use with a short barrel in a HD scenario. I wouldn't be shooting paper with it on a regular basis.
Its peaking my interest due to its ability to stay subsonic and cycle the weapon. Ill speak for myself, .223 does everything I need it to do (punch holes in paper) its cheap economical and fun to shoot. I am interested in 300 Blk because it uses existing ar mags, and you swap a different upper or barrel and you can have a round thats a little more fun to shoot supressed.
My main interest is to shoot it suppressed. Close secondary interest is I may make it my main HD rifle.
Wilson announced a 300Blk upper about 2 weeks ago.
Hi, I'm somewhat new to the forum and this is my first post.
From what I have seen is the 300 AAC Blackout being loaded with H110 pistol powder gives it the advantage that most of the powder burns before exiting the muzzle on a shorter barrel. This both reduces the muzzle blast and flash. From my limited experiences with this, it also provides reloaders with a great platform. Trimming and forming from 223 brass can yield inexpensive 300AAC brass. Unlike 6.8, this round feeds fine with standard AR mags and requires no special bolt, firing pin, or other non-standard parts aside from a barrel.
Where I really seeing this cartridge shining is the LE world where one can deploy from a vehicle with a 30 cal SBR that can still sling lead at 2300 + fps. On top of that, there is significantly less muzzle blast for indoor use even without a suppressor.
Just from what I've seen, I will probably be getting a barrel assembly in the near future. Has anyone used the CMMG 300AAC barrels?
I like the 300blk cartridge, it has a lot of advantages. But I've decided it just costs too much for me right now. If the ammo price comes down some, and availability goes way up, then I'll reconsider. I'd like to put together a suppressed HD carbine in 300blk, but I know I won't shoot it much (i.e. practice) due to the ammo cost. I'll stick with 5.56 for 'serious' use for now, and I'm slowly gathering parts to build a 9mm AR for a fun suppressed gun.
anybody roll their own 300 brass out of 223 yet? does it work good?
I'm still seeing availability is a minimum. has any news been published about the 5m rds that Remington said would be out in February?
Yes, I said we lost two months to do testing including arctic and desert temp ranges. It is not that it took two months to do the testing, but it had to be worked back into the loader schedule. More ammo is being made this week and will be out this month.
i AM looking forward to building the upper and trying the round out, and realize that initial startup is always a PITA. I just want my cake and eat it too, without making my own brass and ammo :).
Allen Arms and others have 300 AAC factory primed brass in stock now. 2000 cases per box. Prices are much lower than 7.62x39 brass.
CMMG is also carrying the primed brass for 300 now.
http://cmmginc.secure-mall.com/categ...g-Supplies-190
One of the criticisms I've seen of the 300BLK is that the rounds are limited in OAL due to the magazine rib in the AR magazine. Do any of the reloaders have expperience with this?
It seems a fine detail that would only arise in certain situations, but when I'm looking at a non-suppressed 300BLK vs 6.8SPC, that would happen to be one!
6.8 always needs custom mags.
Yes, I am aware of that, one of the selling points of 300Blk is it doesn't.
My question was are people finding the claim that the magazine is limiting the OAL of the 300BLK true.
For the 110-125 grain bullets I like, it does not limit them because they are short.
It mostly effects heavier bullets - like the 175 Sierra that I use to make major power factor.
I have been loading my own for a couple years now. Works fine. Very easy caliber to load for. Kinda like a 30 Carbine.
I load my 300 plinking ammo on a Dillon 1050 and 300 bolt gun ammo on a Dillon 550 with a Prometheus measure.
For supersonic ammo I really like the Nosler 125 Ballistic Tip. For subsonic the Sierra 220 is awesome. For full auto subs I use the 175 Sierra surplus.
In fact the 300 Whisper/Blackout M-16 that Thunderbeast Arms used at their suppressor demo day last weekend used my brass.
The _.__x39 can be tricky to make feed out of an AR due to the taper of the case. I have had 5.45 and 7.62 uppers and neither could go 500 rounds without an issue related to mags and ammo.
How are those surplus 175 grain Sierras? A friend of mine said he got some 6 months ago at a match but hasn't loaded them yet.