AR 10/165 SST/IMR 4064- Need Data

[hafejd30]

I'm putting together an AR 10 for hunting. Inside 500 yards, mostly under 300 yards. I've done a lot of reloading/shooting etc for bolt guns but never for an AR. I'm looking for someone who can share hornadys recommended data for IMR 4064 and a 165 SST. Also if anyone has used this combo in a gas gun please let me know what you started with. I will most likely be crimping at the cannelure. My following list is this:


165 Hornady SST
IMR 4064 Powder
CCI 200 Primer
Winchester Brass- full length sized using RCBS AR dies

I've used this combo in my bolt gun with a 20" barrel. Tested 42.0-43.5 grains and found a good load at 43.5 gr with no pressure signs. I don't remember where I got this info from when I loaded for the bolt gun but wanted to make sure before I used about the same loads to test that the AR can handle this. I'm afraid I'd beat the gun before knowing its to much.

This is with a Rock River LAR8 in 308 win with a 20" barrel.

Again just looking for a starting point. Even just the data from hornadys book will do I just don't have the book and almost always use Sierra bullets but have these SST's laying here with 8lbs of 4064 and have had good luck on whitetail deer with them in my bolt gun.

Hodgdon is showing 42-46.3gr for 165 Hornady SP. I'm assuming the SST would be about the same. Just keep on the lower end for the AR platform....

Any help is appreciated,
Thank you

[bearcatrp]

Haven't shot that combo out of my AR-10, shoot 168 A-Max. Just suggesting you use LC brass. Gas guns shew the crap out of commercial brass. The LC is thick and can take the abuse. Was using 4064 on my DPMS 308 but sold that and now shoot a 12.5 barrel 308 AR with 8208. Have found soft points load a little different than the A-Max. Can go dig up the data if you think the 168 data will help, which should be very close to the 165 your shooting.

[shagerott]

Looking at older data . . safety precautions and load workup disclaimer applies here. Bolt action rifle data.

Sierra 308 from 2012 - 165 grain bullet 37.6 to 43.5 grains IMR-4064
Speer 308 from 1995 - 165 grain bullet 41.0 to 45.0 grains IMR-4064 (Note OAL is longer to 2.800" for BTSP and FBSP)
Hornady 4th - 165 grain bullet 38.5 to 43.5 grains IMR-4064 (They dropped 4064 from the 9th edition but gave same data for 165/168)

[hafejd30]

Thank you both. Seems I'm right in the area I need to be. I'll start low. This isn't a 1000 yard gun or anything so I can skimp on velocity to save on pressure