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Probably not far off, short barrels kill velocity, badly in some cases....:(

More case capacity, the 7.62 x 39 brass is small inside when fire formed

Similar :)

30 Grendel upper

http://i1004.photobucket.com/albums/af161/Kiwi-Greg/IMG_2178_zpsv0up8jzt.jpg

Shoots pretty well :thumbsup:
...

The accuwedge seem to work ok

I'm not sure if there is a problem to fix as the scope is attached to the upper anyway

Here is a video I haven't watched ...

...

And another one is introduced to the 338 :)

http://i1004.photobucket.com/albums/af161/Kiwi-Greg/IMG_1178_zpswjro0qhu.jpg

The little shits make a hell of a mess :XD:

450 Bushmaster bolt head, I'm using BM1, 2207 works well too

I do :)

http://i1004.photobucket.com/albums/af161/Kiwi-Greg/IMG_9564_zpsl2dpotvm.jpg

160 TTSX at 2600fps now

Good old 338BRX upper strikes again :)

http://i1004.photobucket.com/albums/af161/Kiwi-Greg/IMG_1126_zps1jzfwc64.jpg

They are getting smaller ;)

Buggers were still digging up the grass :XD: the 338 got another one :)

http://i1004.photobucket.com/albums/af161/Kiwi-Greg/IMG_1009_zpsmb6hipbe.jpg

65lb Sow looks like the Boar I got the other...

The 338 got another one :)

http://i1004.photobucket.com/albums/af161/Kiwi-Greg/IMG_0954_zps3nbma2ib.jpg

Dressed 142lbs, he won't be making a nuisance of himself anymore :D

Here is the 300 AAC Proof barreled upper I got going yesterday :)

http://i1004.photobucket.com/albums/af161/Kiwi-Greg/IMG_9910%202_zpsga44du60.jpg

Shoots great just like the 6.5 Grendel upper,...

That bits easy, http://www.nzhuntingandshooting.co.nz/f45/ar15-proof-research-6-5-grendel-barrel-37192/#post629653

Its a upper for me, I have a few, only one 223 though :thumbsup:

Proof Research 6.5 Grendel barreled upper :)

http://i1004.photobucket.com/albums/af161/Kiwi-Greg/IMG_9866_zpsrgzibvpb.jpg

Well I for one really like hunting with my ones, they still don't like my 338 BRX :)

http://i1004.photobucket.com/albums/af161/Kiwi-Greg/IMG_9720_zpshi09pll9.jpg

Been a wee while since I saw...

Now the 450 Bushmasters on the board

http://i1004.photobucket.com/albums/af161/Kiwi-Greg/IMG_9693_zpskdrulzhk.jpg

The 275 grain Barnes did a pretty good job.

The 338BRX is on the board :)

http://i1004.photobucket.com/albums/af161/Kiwi-Greg/IMG_9597_zpss7pk6c04.jpg

Might have to take the 450BM next

30 BRX upper

http://i1004.photobucket.com/albums/af161/Kiwi-Greg/IMG_9537_zpsbtx3aqdi.jpg

338 BRX upper

http://i1004.photobucket.com/albums/af161/Kiwi-Greg/IMG_9556_zpsaq3pfhgv.jpg

450 BM...

You have to be careful not to over power the bolt head, very easy to do & they are quiet delicate :(

Here is my Lower with the 30 BRX upper on it.

http://i1004.photobucket.com/albums/af161/Kiwi-Greg/IMG_8039_zpsscv7jl4a.jpg

As mentioned previously it shoots pretty well, yesterdays efforts.
...

LOL, I have a custom CA 10 that puts 250 grain projectiles out at 3100 fps, 1/2-3/4 moa accuracy :cool:

Its an AR15 :)

Define a standard AR15 :)

I have 8 or 9 uppers, can't remember, think its 9 from 223 to 450 BM :)

30 BRX 20", rifle length gas.

Spikes lower, Aero Precision upper, TF barrel, ASE suppressor :)