Conversion to 300 AAC BLACKOUT reamer

[rsilvers]

PTG is making a reamer which cuts the complete chamber except for the shoulder so it will not increase headspace. Generally, this will lengthen the throat and ensure the diameter is not too small.

This is the same idea as converting a 223 to 5.56mm chamber or a 6.8 SAAMI to 6.8 SPC-II chamber.

They will have a match one for bolt actions and one with a little more space for ARs to feed easier.

[jacack]

what is the blackout?

[rsilvers]

It is the version of 30-221 Fireball which has been submitted to SAAMI by Remington and AAC as the new standard.

www.300aacblackout.com

Remington is making ammo for it in large quantities and at good prices starting real soon now.

[HOG GUNNER]

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.

[Idge]

At this time I don't have time to reload. So I bought some Corbon 300 Whisper ammo to shoot through my 300 Fireball. I had to put a carbine length spring in my full length tube to make them to eject out of my 16" 300 Fireball (model 1). Then I got a hold of some cheaper $20 a box 300blk ammo. (Compared to $40 a box Corbon 300 Whisper,) and they chambered and ejected perfect and seemed just as accurate as the 300 Whisper to me. Go gauge said go. So 40 rounds of BLK no fails to feed, shoot or eject. I think the 300 Whispers were quieter.(no suppressor) Maybe do to the less depth of the 220gr. bullet? Does anyone think think the less depth would mean slightly better accuracy too? You can tell that the shorter BLK feeds quicker/smoother. Which factory220 loads do your reloads resemble more? Corbon or Rem?

[Hoser]

Originally Posted by jacack

what is the blackout?

http://www.quarterbore.net/forums/showthread.php?t=4361

[rsilvers]

http://www.ar15.com/forums/topic.htm...f=121&t=516732

You can't just ream out an existing chamber. Doing so would alter the headspace which is something you can't fix as that would cause problems with the gas tube length.

All of which is moot cause the 300 Blk is the same thing as a 300 Whisper. The Blk is just a saami standardized 300 whisper

.

You can ream out an existing chamber. You can do it with a normal reamer being careful to not increase headspace, or you can do it with a special reamer as discussed in this thread. Further, 300 AAC BLACKOUT is not the same as CIP 300 Whisper(TM).

There is more freebore in 300 AAC BLACKOUT, which means if you load ammo to max pressure for each, you will get more velocity from 300 AAC BLACKOUT. It also means if you load ammo to be max pressure in 300 AAC BLACKOUT, and then shoot that ammo in 300 Whisper, you will likely have additional pressure.

[sha-ul]

Originally Posted by rsilvers

PTG is making a reamer which cuts the complete chamber except for the shoulder so it will not increase headspace. Generally, this will lengthen the throat and ensure the diameter is not too small.

This is the same idea as converting a 223 to 5.56mm chamber or a 6.8 SAAMI to 6.8 SPC-II chamber.

They will have a match one for bolt actions and one with a little more space for ARs to feed easier.

do you know anyone with this conversion reamer,& any idea how much it should run for the touch up?

[rsilvers]

There is a guy on silencertalk who ordered one and said he would charge $50 plus shipping.

[sha-ul]

Originally Posted by rsilvers

There is a guy on silencertalk who ordered one and said he would charge $50 plus shipping.

Got a link?