300 blackout

[SwampF0X]

So, what's the deal with this new cartridge? Why or is it any better than a 300 whisper 300/221 fireball?? Is it still made from .223 brass?

thanks,
swampf0x

[rsilvers]

About the same but was submitted to SAAMI as a standard. The velocity is a bit higher due to longer freebore - like 5.56mm compared to 223.

[bigginall8s]

basically the same critter. although JDJ will prolly disagree!:grin:

[sha-ul]

basically the same critter. although JDJ will prolly disagree!:grin:

I imagine if JDJ had ben a little more flexible, instead of demanding royalties, could have submitted the whisper for SAAMI and there would not have been a need for the 300blk or all of the other 300whatever names

[jimpa]

I imagine if JDJ had ben a little more flexible, instead of demanding royalties, could have submitted the whisper for SAAMI and there would not have been a need for the 300blk or all of the other 300whatever names

My gunsmith called him to get a reamer. No WAy Hosea,,, $700 for him to chamber5 and install a standard douglas bbl on my action.
Nope/ went 300/221 bought a reamer and the gauges,,, He could have rented one out and made 50 bucks from most everyone on here.

[i8asquirrel]

Pacific Tool and Gauge has them. . .

[bigginall8s]

I imagine if JDJ had ben a little more flexible, instead of demanding royalties, could have submitted the whisper for SAAMI and there would not have been a need for the 300blk or all of the other 300whatever names


You're EXACTLY RIGHT! Now look at all the publicity his round WONT get all because of pride and arrogance.(IMO) Its a shame , because the AR world wouldve propeled the whisper to greater levels of popularity and he wouldve gained much more business to boot. :confused:

[SwampF0X]

So, which one would be more accurate/reliable from an AR action? Can the brass be made from .223 hulls?

swampf0x

[Alleycat]

Factory brass will be available soon.

[Hoser]

So, which one would be more accurate/reliable from an AR action? Can the brass be made from .223 hulls?

Both are plenty accurate in an AR. The BLACKOUT just has a slightly different throat. Kinda like comparing a 5.56 chamber to a 223 chamber.

Just like the whisper, 300 BLACKOUT brass can be made from 223/5.56 brass. I have many thousands of pcs for people this past year.

[Spook]

Both are plenty accurate in an AR. The BLACKOUT just has a slightly different throat. Kinda like comparing a 5.56 chamber to a 223 chamber.

Just like the whisper, 300 BLACKOUT brass can be made from 223/5.56 brass. I have many thousands of pcs for people this past year.

Hose, has anyone checked to see how easily blk brass can be formed into whisper?

[Hoser]

Hose, has anyone checked to see how easily blk brass can be formed into whisper?

Should be too easy. Run a sized Blackout case into your Whisper chamber, if the bolt closes, your in business.

I have Blackout and min spec Whisper (300 Hush) case gauges. FL sized Whisper brass goes in both.

I have SSK Whisper dies, Redding 300/221 and Forester 300 AAC BLACKOUT dies and they all size the case to almost the exact same dimensions.

[Spook]

So if your thinking of swapping out chambers solely for the purpose of being able to be able to utilize the new factory brass...
you'll be able to run it throgh a whisper die and end up in the same place:confused::smile:

[rsilvers]

What will a Whisper(R) die change about 300 AAC BLACKOUT brass?

[Spook]

What will a Whisper(R) die change about 300 AAC BLACKOUT brass?

Thats what I'm asking. See the little question marks over the blue smiley head?

[Hoser]

What will a Whisper(R) die change about 300 AAC BLACKOUT brass?

Nothing that I have been able to find, so far.

[rsilvers]

I don't have an SSK drawing, but I saw a CIP 300 Whisper(R) drawing (well after BLACKOUT was submitted) and there seemed to be at most a 0.0004 difference in headspace - which is metric->imperial conversion tolerance (within 0.01mm).

[Mike Bell]

So if we have a 300/221 Tp555 barrel....300BLK dies would work? I havent bought dies yet and I have been waiting on hearing what the differances were.

[rsilvers]

There is probably far more variation in 308 dies from brand X to brand Y than there is between 300 AAC BLACKOUT and the 300-221 drawing I saw.

[sha-ul]

You're EXACTLY RIGHT! Now look at all the publicity his round WONT get all because of pride and arrogance.(IMO) Its a shame , because the AR world would've propelled the whisper to greater levels of popularity and he would've gained much more business to boot. :confused:

Talk about cutting off your nose to spite your face:confused:


on a different tact... looking at the different throat between the 300blk& the 300whatever it looks like the pressure issue because of it would be most noticeable with the longer heavier bullets such as the 220& 240, there would by default have much more clearance with a 125 or other smaller bullet correct?

[HOG GUNNER]

There is probably far more variation in 308 dies from brand X to brand Y than there is between 300 AAC BLACKOUT and the 300-221 drawing I saw.

With Chamber pressure at 21,100 psi ? I feel if you make a 300 AAC M1 carb round cheaper than the 30 carb ammo on the market now. You could open a hole new market for this round, and run it in the platform it was made for 30 years ago. With a ream and a little bolt work any M1 carbine could fire this round loaded to an (OAL) of 1.680 with 110gr RNFMJ or 110gr RNSP. and be legal to hunt with. I like hunting with my hand me down carbine from pop in .300 fireball. I would much rather have had it on any of my deployments than any M4. Even at close range 5.56 had all it could do to punch threw block or mud huts. My fireball will make dust out of block at 100 yards with FMJ.

[Shadow 300]

I have been looking for a 300 BLK and was thinking I would use a 8" or 10.5" barrel. I have a YHM 7.62 Phantom for it. The problem is YHM states that they won't warranty their suppressors against baffle strike if a barrel less than 12.5" is used. They claim that regardless of the 1:8 twist that a barrel must be at least 12.5" long to stabilize a subsonic bullet. I have read many posts about people using 8" barrels with the various versions of a 300 whisper. Are baffle strikes a concern with barrels less than 12.5". I had thought bullet stabalization was a function of barrel twist and bullet length, not barrel length. Can someone give me their opinion please?

[rsilvers]

Stability is a function of RPM.

Bullet RPM = MV X 720/Twist Rate (in inches).

So the faster the bullet goes, the better.

Run the Miller stability calculation and see if the value is high enough. 1.5 or more under nominal conditions should be fine.

[Shadow 300]

rsilvers
Is this (mass x velocity) x 720/twist or (mass x velocity x 720) / twist, what are the units? Thanks

[Retooferab]

I think mv = muzzle velocity

[rsilvers]

MV = velocity in fps

[grey2112]

I have been looking for a 300 BLK and was thinking I would use a 8" or 10.5" barrel. I have a YHM 7.62 Phantom for it. The problem is YHM states that they won't warranty their suppressors against baffle strike if a barrel less than 12.5" is used. They claim that regardless of the 1:8 twist that a barrel must be at least 12.5" long to stabilize a subsonic bullet. I have read many posts about people using 8" barrels with the various versions of a 300 whisper. Are baffle strikes a concern with barrels less than 12.5". I had thought bullet stabalization was a function of barrel twist and bullet length, not barrel length. Can someone give me their opinion please?

I have an 8" barrelled 9mm with a 9mm suppressor, and have used the same suppressor on my 8" barrelled .300-221 - nary a problem - maybe I'm just lucky, but both the 9mm and the .300-221 out of those barrels are damn accurate and don't keyhole.

[mak91]

I've got a 7inch 300 whisper that I run a aac 7.62 can on, no issues yet with baffle strikes.

[Shadow 300]

Thanks Guys,
The Miller stability calculation can be found at JBM Ballistics. It indicates there will be no problem. It doesn't consider barrel length at all just length of bullet, diameter, weight, muzzle velocity, twist rate, temp, and ambient pressure. I have read before that barrel length is not a consideration so I am comfortable with the result.

[rsilvers]

http://img156.imageshack.us/img156/7178/p1050155b.jpg