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Altair,
Do you have a method for removing that rib from inside the Pmag body?  A 1/4" wood chisel is what I am considering.

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Only the 9 inch barrel version of the BLACKOUT has the gas port in the pistol position (really the only option) the 16 inch version uses a carbine position port. Here is the link where they talk about it. http://www.silencertalk.com/forum/viewtopic.php?f=128&t=62993

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There are a number of posts on silencertalk under subsonic/ 300 whisper and also on quarterbore under 300 whisper where rsilvers talks about the carbine gas port being the best option. Most did not agree. Seems they have one or two subsonic loads that work well using 1680 powder and they are sticking with that. All and all I think what they are doing is a good thing. I think it will open up this round to alot more people, ones that don't reload and want to by something off the shelf that works(assuming the price is right) for upper/ammo/suppressor. And hopefully give the rest of us access to brass from alot more sources without having to form our own.  I've got 3 whisper uppers, I started with a m1s 16 inch upper back in 2004 and almost gave up on the round because of all the issues with getting it to cycle well with subsonics. After finding the quaterbore site with all the great info and people on that site and learning from all the mistakes I made I find my 7 inch 300 whisper of the most fun guns I shoot.

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It will not compare to the 6.8 SPC in terms of faster or flatter.  Assuming this round can improve on 300 Whisper by 100fps you'll see velocities like 2200fps for the 123gr bullet, 2000fps for the 155gr bullet, and around 1000fps for the 220 (since subsonic is the point) in an SBR.  Add about 100-150 fps or so for a 16" barrel and maybe 50-100fps more for a 20" barrel.

This round will likely be very efficient in short barrels just like the 300 Whisper and the 7.62x40.  It has a large bore to case diameter ratio and uses fast burning powder.  That is also why you won't gain much in a longer barrel.  The case volume and powder burn rate won't take advantage of a long  tube.

A long range gun it will not be.  For CQB or suppressed work it could be very useful provided they use the right bullets.

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Link to AAC's site within the Military Times article.  It's a 7.62 x 35.

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The following was posted on Quarterbore from someone claiming to be R&D for AAC:

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According to the AAC Blog on the AAC website the first batch of uppers are shipping tonight for availability on Oct 7th.  An SC dealer has an allocation of 12 currently being pre sold according to a thread at the link below.



Link



http://i752.photobucket.com/albums/xx166/jasonusvi/LMT%20MRP/300-main.jpg

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I wonder which one of those is mine

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$1080 shipped?  Guess its not too bad a price if includes BCG.  What rail does it use? CL barrel?  I just cant wait to see the ammo start to flow and see if its compatible with my new Whisper... or if I need to ream and get a set of 300BLK reloading dies to get with the big money standard.

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So they basically standardized the .300-221 Fireball/.300 Whisper? Or is it something else?

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So they basically standardized the .300-221 Fireball/.300 Whisper? Or is it something else?

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now this is how cartridge development should work. Not some damn boutique round that you can only buy 3 types of ammo for and only one gun for. I wonder what it would do out of a 20 inch bolt gun? Make a nice 400 yd deer/coyote rifle.

hmm could use .223 stripper clips, mags, bandoleers, ammo cans. Only problem would be clearly identifying the caliber of the weapon. a 223 would not chamber a 300 but a 300 would chamber a 223 could cause a messed up barrel.

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good points. what about making it a 7mm?

kind of like a 7-08 but based on the 300 blk.

lots of 7mm bullets out there.
wildcatting a wildcat. i guess that is what happens once it goes std.

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There are 7mm variants of the .223 case like the 7mm TCU that could be used to hunt deer with.  The trouble is that if you use the full length of the .223 case you run into OAL problems and if you seat the bullets deep you get capacity restrictions as the bullet encroaches on the powder space.  That can be somewhat mitigated in a bolt gun that doesn't have the AR mag length restriction but ultimately the case is just too small to support a 400 yard deer rifle.  200 can be done and maybe 250 but much past that and you need something bigger IMO.



ETA:  I'm not saying you couldn't hit a deer with a .223 variant at 400 yards, but I don't think it would have enough punch left to kill humanely.

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Just a couple things I noticed......

If below is a pic of the blackout....




+1 on that...Kurt any news on the 7.62X40 barrels ?

It doesn't seem to jive with their below suggested COAL of ~ 2.089"......round looks about the same length as the .223 ?  2.250 ~2.260"

If it does go to market and it ends-up headspacing the same as a 300 Whisper it would be a great thing for brass availability if nothing else.....if the Blackout chamber is set-up to run such a short cartridge overall length, the factory loaded ammo would have close to .200" jump to the lands in a Whisper chamber???

I think a better solution to the magazine rib problem would be to work a deal with MagPul to make a rib-less Blackout PMAG and keep the longer loaded length....
I spoke with Drake at MagPul about two years ago to try this with the 7.62x40, I was willing to buy 1,000 mags if they would modify a set of tooling to make a rib-less "wildcat" version......there are probably a dozen .223 based wildcats that could benefit from such a mag including the 300 Whisper and now the Blackout....I still think there is a market for a rib-less PMAG, including a joint Blackout PMAG.....It would be too easy to do and solve several problems at one time....

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Woo Hoo!  I think I just decided on my #3 300 BLK.

My #s so far

#2 .223/5.56
#4 458 SOCOM
#5 50 Beowulf

Hmmmm, anyone make a .17 upper?

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I sent an email to Noveske asking if they had plans for this round.  Here is the response:



"Noveske Rifleworks will be changing our 300 Fireball barrel production to the 300 AAC BLACKOUT.



We will also make complete rifles and uppers when ammo is available for test firing.



The 300 AAC BLACKOUT is a standardized/SAAMI version of the wildcat 300 Fireball or 300-221 and the proprietary 300 Whisper(R). Ammunition will be made by Remington at first but other ammunition manufacturers will be more likely to offer it as a standard cartridge with specs available.



http://300aacblackout.com/



We are going to be looking at barrel lengths and function when we start testing the 300 AAC BLACKOUT. I'm not sure what sizes we will be producing until then.





Todd Krawczyk

Noveske Rifleworks LLC

P.O. Box 1401

Grant Pass OR 97528

541-479-6117

Fax 541-479-2555

www.noveskerifleworks.com"

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[div]My 10.5" is well above the cutoff, now to actually build it into a rifle and buy a .30 can.

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The 300 won't chamber in a 223 because the bullet is too big.  

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Umm, 110 Vmax seated to ogive drops right in... just saying....

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Nice. I have the same barrel. You going to reload or shoot commercial? I'm hoping to find a recipe that will shoot and cycle 175s subsonic so its cheaper and compatible with my 308 stash of projectiles.

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Doc, have you done any testing with the Whisper?  I'm just wondering if you've had any luck finding good terminal performance at he reduced velocity.  If not, I don't see how this round could begin to replace 5.56 or other calibers.  I hope to do some gel testing with my 300/221 and my 7.62x40 soon.  My department may be doing some testing on 5.56 ammo soon so I'm plan to learn the process buy some of my own gelatin.

While the 30 HRT, 300 Whisper and 7.62x40 all indeed mimic the 7.62x39 in
terms of muzzle velocity and energy, the similarities end there.  The key to
these .30 caliber cartridges is the ability to use the vast array of .30
caliber projectiles compared to the relatively limited selection of .312
bullets.  For the .300 Whisper and the 7.62x40, the added benefit is the
ability to use standard .223 magazines, bolts and brass, reducing not only
the cost of components, but also often affording longer service life (AR15
bolts in 7.62x39 are more prone to failure than their .223 counterparts)

Really the main reason for the .30 HRT was to be able to use a carbine
length gas system with the 240 SMK subsonic loads - some other barrels
makers were making .300 Fireball barrels with that gas system and they would
not work, this was a way to rechamber those and get them in a working state
(without having to relocate the gas port).  That and the plethora of .30 cal
bullets - the only thing the .338 has over the .308 subsonic loads is mass
(using COTS bullets, not counting custom bullets) with 300 gr versus 240 gr
and a slightly larger frontal area...

The case capacity for the 30 HRT is about 35 gr water, whereas the .338 has
about 29 gr water, plus the 30 HRT can run at much higher pressure - there
is a phenomenon that comes into play when the bullet diameter is close to
the case diameter (minimal shoulder) that makes these types of short cases
unusually efficient - the .22 Spitfire is another one of these little ones
that just shines.

The 30 HRT will run just fine semi-auto with the 240 SMK loads - we even
built an upper with a piston system that runs the supersonic loads and then
the suppressed subsonic loads without a hiccup, just select the proper
setting on the piston system...

The 35-10mm Magnum has actually been chambered and was one of the cartridges
we referenced during the design of the .338 Spectre - the challenge is that
in .35 caliber there are no true match grade bullets available, plus it will
require a custom twist that is not normally found to stabilize the subsonic
loads.  That was the blessing of the .30 cal and the .338 cal - because they
are used in the military and long range competition, both have match grade
heavy bullets available and there are more twist rates out there.