AAC 300 Blackout 9" accuracy

View previous topic View next topic Go down

AAC 300 Blackout 9" accuracy

Post by Bitwise on Mon Oct 31, 2011 8:01 pm

I know some of you guys have 300 blackout uppers. I'm thinking that, for my next project, I'm going to get a 9" upper and an AAC 762-SD for my SBR.

Does anyone have any idea the accuracy that I can expect from a 9" barrel? I'll be shooting subsonic handloads exclusively and, from what I've read, you don't miss much energy from the shorter barrel with subsonics, but I'm not sure how it will affect the accuracy of the round out to 200 yards.

Bitwise
Veteran Poster
Veteran Poster

Posts: 192
Join date: 2011-01-06
Location: Oxford, MS

Back to top Go down

Re: AAC 300 Blackout 9" accuracy

Post by miker84 on Fri Dec 02, 2011 6:03 pm

Don't have any real world experience with a 9" on a 300, only what I've read at arfcom and 300blktalk

miker84
Distinguished Poster
Distinguished Poster

Posts: 2963
Join date: 2010-03-15
Age: 43
Location: Senatobia

Back to top Go down

Re: AAC 300 Blackout 9" accuracy

Post by rsilvers on Fri Dec 23, 2011 4:14 pm

Aimpoint Micro with no magnification at 100 yards. 5 shots.

http://img521.imageshack.us/img521/9564/img7117urlsmall.jpg


rsilvers
New Member
New Member

Posts: 11
Join date: 2011-01-02

Back to top Go down

Re: AAC 300 Blackout 9" accuracy

Post by Bitwise on Mon Dec 26, 2011 4:36 am

Thanks Robert!

Bitwise
Veteran Poster
Veteran Poster

Posts: 192
Join date: 2011-01-06
Location: Oxford, MS

Back to top Go down

Re: AAC 300 Blackout 9" accuracy

Post by SHANE704 on Mon Dec 26, 2011 10:28 am

shooting a mix of subsonics and full power ammo, would there be any advantage of going to an 11" bbl over the 9"

SHANE704
Established Poster
Established Poster

Posts: 141
Join date: 2010-02-25
Age: 25
Location: Wayne County

Back to top Go down

Re: AAC 300 Blackout 9" accuracy

Post by SHANE704 on Fri Jan 06, 2012 12:14 pm

anyone?

SHANE704
Established Poster
Established Poster

Posts: 141
Join date: 2010-02-25
Age: 25
Location: Wayne County

Back to top Go down

Re: AAC 300 Blackout 9" accuracy

Post by miker84 on Fri Jan 06, 2012 5:19 pm

All I can tell you is that my 16" barrel with 125gr handloads runs 2150-2250fps. AAC shows that a 9" runs 2000fps with that same projectile....that isn't a big difference for the ranges the caliber would be used. As soon as I get my paperwork done, I'm going with as short of a barrel as I can on my 300. If I hunt with it, I'm sticking with inside 100yds. If I'm trying to hit kill something 200+, then I'm using a different rifle.

That's one of the benefits of this cartridge is that you don't get a real big gain by going to longer barrels.

miker84
Distinguished Poster
Distinguished Poster

Posts: 2963
Join date: 2010-03-15
Age: 43
Location: Senatobia

Back to top Go down

Re: AAC 300 Blackout 9" accuracy

Post by SHANE704 on Sat Jan 07, 2012 6:50 pm

my main concern was it cycling subsonics...i didnt know if the extra 2" past the gas port would make much difference

SHANE704
Established Poster
Established Poster

Posts: 141
Join date: 2010-02-25
Age: 25
Location: Wayne County

Back to top Go down

Re: AAC 300 Blackout 9" accuracy

Post by miker84 on Sat Jan 07, 2012 7:24 pm

SHANE704 wrote:my main concern was it cycling subsonics...i didnt know if the extra 2" past the gas port would make much difference


That's why I went with the pistol length gas system.

miker84
Distinguished Poster
Distinguished Poster

Posts: 2963
Join date: 2010-03-15
Age: 43
Location: Senatobia

Back to top Go down

Re: AAC 300 Blackout 9" accuracy

Post by Stumpbud on Sat Jan 07, 2012 8:03 pm

Mine has a pistol length gas tube also.

Stumpbud
Veteran Poster
Veteran Poster

Posts: 168
Join date: 2010-12-22
Age: 49
Location: Kokomo Mississippi

Back to top Go down

Re: AAC 300 Blackout 9" accuracy

Post by SHANE704 on Sun Jan 08, 2012 2:15 pm

does the 9" with pistol length gas system cycle sub's fine?

SHANE704
Established Poster
Established Poster

Posts: 141
Join date: 2010-02-25
Age: 25
Location: Wayne County

Back to top Go down

Re: AAC 300 Blackout 9" accuracy

Post by miker84 on Sun Jan 08, 2012 2:40 pm

SHANE704 wrote:does the 9" with pistol length gas system cycle sub's fine?


It's my understanding that the pistol length gas system is best for subsonic so the action will cycle on short barrels (like a 9").

miker84
Distinguished Poster
Distinguished Poster

Posts: 2963
Join date: 2010-03-15
Age: 43
Location: Senatobia

Back to top Go down

Re: AAC 300 Blackout 9" accuracy

Post by rsilvers on Tue Jan 10, 2012 2:12 pm

Pistol length gas is best for any barrel under 16 inches for any type of ammo.

Remington UMC 115:

http://www.midwayusa.com/product/547535/remington-umc-ammunition-300-aac-blackout-762x35mm-115-grain-full-metal-jacket-box-of-20

On a full auto, subsonic suppressed and supersonic unsuppressed 115 are at the same cyclic rate. Adding a suppressor to the 115 UMC only raises the cyclic rate about 50rpm - about 1/4 as much as it would in 5.56mm. So the same gas port is ideal for both.

rsilvers
New Member
New Member

Posts: 11
Join date: 2011-01-02

Back to top Go down

Re: AAC 300 Blackout 9" accuracy

Post by TooBeers on Tue Jan 17, 2012 3:40 pm

I have a 16 inch one and I can get between three and four inches with mine but that is with open sites and remington subsonic ammo.

TooBeers
New Member
New Member

Posts: 16
Join date: 2011-08-02
Age: 31
Location: Grenada

Back to top Go down

View previous topic View next topic Back to top

- Similar topics

Permissions in this forum:
You cannot reply to topics in this forum