subsonic load for AR57

[i8asquirrel]

we played around this weekend and found what seems to be the Load.
60 gr. V max
cci 400 SRP
2.7 gr Clays ( Hogdin)
coal 1.585"

fucntioned great and seemd pretty accurate at 100yds!
very quite through my suppressor good luck!:uzi2:

[sharky47]

Basically the same load I came up with via quickload. I am using my mono-metallic 60 grain .224 bullets I make on the CNC lathe though. Same powder, but for me the best load was 2.5 grains of the same powder.

Here is a link to my YT video of this ammo through my 16" AR57 and Gemtech OB2:

http://www.youtube.com/watch?v=k1z_cDYnfuk

[i8asquirrel]

Outstanding have you used it on game I was thinking that at subsonic velocity the 60 gr Vmax would have more standard expansion. but have not used it on anything but ground squirrel so far. I owe you the credit for the load data I think It got it from one of your previous threads!

[sharky47]

Glad I could help!

No, I havn't shot anything but paper/steel.....Sooner or later I am going to design a more appropriate bullet shape for the subsonic loads though. We are swamped at the shop and all the lathes are busy on "real" jobs right now.

[Garrett]

Outstanding have you used it on game I was thinking that at subsonic velocity the 60 gr Vmax would have more standard expansion.

Sorry - zero expansion at subsonic speeds. This was shot into a row of water-filled milk jugs. I think it went through two and stopped in the 3rd (or maybe it was the 4th. It's been a while).

Even so, I've been following some of the subsonic 5.7 threads. It seems this would be the answer to all of those guys who want a subsonic 5.56 that still cycles the action. A 65 or 70 gr. bullet would be excellent, even if it doesn't expand.

http://img.photobucket.com/albums/v632/GarrettJ/Misc%20NFA/103_5669.jpg

[sharky47]

Sorry - zero expansion at subsonic speeds. This was shot into a row of water-filled milk jugs. I think it went through two and stopped in the 3rd (or maybe it was the 4th. It's been a while).

Even so, I've been following some of the subsonic 5.7 threads. It seems this would be the answer to all of those guys who want a subsonic 5.56 that still cycles the action. A 65 or 70 gr. bullet would be excellent, even if it doesn't expand.

http://img.photobucket.com/albums/v632/GarrettJ/Misc%20NFA/103_5669.jpg

That's pretty much my view on the whole project.

[kanton]

Which way does the AR57 upper eject?

[mak91]

Down the original ar15 mag well.

[Garrett]

Down the original ar15 mag well.

Yep - which makes things even better. If you use a hollowed out M16 mag as a brass catcher, you have the added benefit that it is also covering the ejection port, muffling port noise.

[kanton]

Does the AR57 upper require the AR-15 buffer assembly?

Thanks.

[mak91]

Yes it does, It comes with a heavy buffer, I think its just over 8oz if I remember correctly.

[LouBoyd]

The AR57 has a special bolt and "buffer". Both are heavier then bolt carrier and buffer in an AR-15. The AR-57 is a straight blowback design, not gas operated. It does require a buffer spring. This is my AR-57 pistol: The plastic "magazine" is the brass catcher. That requires cutting off the feed lips. . The one shown holds all 50 pieces of spent brass. The buffer shown is a M1S "pistol" buffer. It uses a standard AR-15 Carbine spring. The much shorter GSE pistol buffer will not work as the AR57's bolt is not bored out from the rear like the bolt carrier in an AR-15 is.

http://i174.photobucket.com/albums/w108/ubvri/Ballistics/dsc08239.jpg?t=1287239959

[i8asquirrel]

no its came with a heavier buffer that you use with your AR spring!