Quarterbore's Forums - 300 AAC BLACKOUT 12.5 inch = 300 Fireball 16 inch?

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- - 300 AAC BLACKOUT 12.5 inch = 300 Fireball 16 inch? (http://www.quarterbore.net/forums/showthread.php?t=4686)

When shooting subsonic rifles cartridges, it is not if you will get a bullet stuck in the bore but when you will get a bullet stuck.

What was your velocities on the two test barrels. I have not gotten to look at the 300 Blackout print yet. How much longer is your throat then the Whisper?

Quote:

Originally Posted by rsilvers (Post 25102)

You can seat longer if you want but 300 Whisper(R) / Fireball has a poor reputation for reliability and that is due to the bullets contacting the USGI rib. Remington ammo is loaded shorter and so is very reliable. A custom magazine will allow both a long OAL and feed reliability if people don't mind buying them.

Yes. Its time for another option. I would like to see custom magazines available.

I would be interested in those mags. I load long for the 300/221 and have a 7.62x40 and both prefer de-ribbed Pmags. It would be nice to get one that I didn't have to modify.

AAC will have mags with shorter ribs.

Any time line or pricing on those mags ? I'd be good for a few of them.

Quote:

Originally Posted by alorton (Post 25112)

I would be interested in those mags. I load long for the 300/221 and have a 7.62x40 and both prefer de-ribbed Pmags. It would be nice to get one that I didn't have to modify.

Yep - I've had best luck with P-mags as well. I've got a couple of 20-round aluminum mags that I modded as well, but the P-mags just need the rib scraped off with a sharp wood chisel.

Quote:

Originally Posted by rsilvers (Post 25096)

...So in effect, the 300 AAC BLACKOUT can get 16 inch 300 Fireball performance from a 12.5 inch barrel...

Okay. But the whole purpose for the .300 Whisper was to shoot heavy bullets at subsonic velocities. It's neat that the 300 AAC can push bullets faster. So can a .308, .30-06, etc. If I want supersonic bullets, I'll use one of those. If I'm shooting a .300 Whisper, or a 300 AAC Blackout, I'm going to tailor the load to give me between 1000 and 1050 fps, in the barrel I am using, whatever that length might be. The top-end velocities in this type of cartridge are not relevant, as long as they are above the speed of sound.

Don't get me wrong. I like what AAC has done with the new cartridge. I like that it's been submitted to SAAMI to give it the mainstream legitimacy that SSK was never able to generate for the .300W. But to tell us that it can push a bullet faster than the .300W just doesn't impress me. That's not the cartridge's reason for being.

Now if you came out and said for a given powder / bullet / velocity combo, the AAC round produces 20% less noise than the .300W when shooting suppressed, I'd be more interested.

Quote:

Originally Posted by rsilvers (Post 25159)

AAC will have mags with shorter ribs.

Shorter ribs (top to bottom), or just eliminate the front rib altogether?

These are of interest to me.

Well it is different things to different people. I am into silencers but I keep my 300 AAC BLACKOUT loaded with full power ammo for home defense. The cartridge can be used for hunting with an AR by people who won't hunt with a 22 cal or where such hunting is illegal with smaller calibers. Then they can still load up 30 rounds and plink away. You can't shoot 308 in an AR15. I think getting lots of velocity is important. Anyway I known Remington will sell far more full power ammo than subsonic.

Quote:

Originally Posted by rsilvers (Post 25096)

I am saying that if you fix the OAL of two cartridges and load the same bullet - one to be 55,000 PSI in a 300 AAC BLACKOUT chamber and load the other to be 55,000 PSI in a 300 Fireball or Whisper(R) chamber and use the same barrel blank for each, the 300 AAC BLACKOUT will be higher velocity.

So in effect, the 300 AAC BLACKOUT can get 16 inch 300 Fireball performance from a 12.5 inch barrel.

The difference being like comparing 6.8 SPC-II to 6.8 SPC SAMMI.

Robert what is the advantage of the 300 AAC blackout over the 300 Whisper? Is the faster velocity the only advantage? I have not really read up on the 300 AAC. I figure you are the one to ask. Thanks