Reloading the .308 for an AR-10

[300 RUM]

The question is simple.
I just finished building an Ar-10, I chambered it with a .308 Bisley, barrel is a .298/.308 bore 26.0" in length. Are there any tips anyone would like to share for loading for accuracy in the AR-10 rifle?

 

[flatlander]

Give the old Sierra #2155 bullets a try in your new 308. I re-cut the throat of my AR10's bbl. - which had been chambered with an Obermeyer Match reamer - with a Bisley reamer, and accuracy improved from 2+MOA down to just under 1 MOA - with no other changes. The Obermeyer has a 2.5* angle in the leade, while the Bisley's is 1.5*.

My AR10 shoots the old 155s better than either 168s or 175s, and isn't particularly picky about what powder I use.

 

[300 RUM]

What kind of case prep are you going thru. I've gone to the extreme for many bolt rifles before, but not sure on the depth I should go for an AR. I have been told to simply stick with FL sizing and standard trimming to 2.0" when needed.

 

[markm87]

We run 42.0 grains of IMR 4064 with 168 SMKs. FC brass trimmed to 2.04" and Federal Large Rifle Match primers. Full length sizing with a type S bushing die.

Shoots great out of my buddy's LMT MWS .308 gas gun.

 

[300 RUM]

OK today was the day.
I loaded up 45gr- RL15 inside a Nosler case with Winchester primers, sat a 155gr Lapua on top and this is what I got:

imag0109 = .481"
imag0112 = .239"
imag0113 = .365

German thanks for the advice!!!

 

[effendude]

My DPMS LR-308 loves the 175 SMK over Varget. Load to mag length and enjoy. The .308 guide on this site lists some very good AR loads. I use some Lake City brass, but range pick-up Federal brass from the local sniper team practices works well. I only use the brass 2-3 times and toss it in the recycle bin. AR-10's are tough on brass!

Scott

 

[jonbearman]

I have an armalite ar-10 and if I want flawless feeding with brass used in anything other than my rifle,I have to run it through a small base die to make sure. If you dont it wont lockup. After all the steps,it is a sub minute of angle gun.I have the a-2 model and wish I had bought the flat top. It wheres a weaver classic extreme 2.5-10x50mm . I cant believe the hornady 168's are so darned accurate using surplus blc-2 . Have you guys had to use a small base die when using unproven range pick-up's?

 

[Will]

ALWAYS use a SB die when running brass hat isn't yours. Makes life a whole easier. That way brass FITS. 'nuff said

 

[Ray123]

I have an armalite ar-10 and if I want flawless feeding with brass used in anything other than my rifle,I have to run it through a small base die to make sure. If you dont it wont lockup. After all the steps,it is a sub minute of angle gun.I have the a-2 model and wish I had bought the flat top. It wheres a weaver classic extreme 2.5-10x50mm . I cant believe the hornady 168's are so darned accurate using surplus blc-2 . Have you guys had to use a small base die when using unproven range pick-up's?

Nope, all of my 308 win dies rcbs, redding, Wilson, & Lee are standard base, and I can shoot a loaded round in any of my 6 308's auto or bolt gun just size to the minimum in a Wilson .308 cartridge gauge. I use a surface plate, the gauge and a drop indicator. All the bolt guns I chamber to minimum with the same reamer. If the chamber is in spec then a cartridge on the minimum setting on the Wilson case gage, will fit any correctly chambered .308, military LC, and all brands of commercial brass, will run through any ar 10 or bolt gun I own.

 

[Dusty Stevens]

Get a jp enterprises case gage and some small base fl dies

 

[6bra1k]

Nope, all of my 308 win dies rcbs, redding, Wilson, & Lee are standard base, and I can shoot a loaded round in any of my 6 308's auto or bolt gun just size to the minimum in a Wilson .308 cartridge gauge. I use a surface plate, the gauge and a drop indicator. All the bolt guns I chamber to minimum with the same reamer. If the chamber is in spec then a cartridge on the minimum setting on the Wilson case gage, will fit any correctly chambered .308, military LC, and all brands of commercial brass, will run through any ar 10 or bolt gun I own.

wow making CLAIMS TEN YEARS LATER.
LIKE any other rifle SIZE FOR THE GUN, not some spec.
and then you can skip the sb die and the case gage
my berger 175's do about 1/2 moa from an early ar10(t)

 

[Ray123]

wow making CLAIMS TEN YEARS LATER.
LIKE any other rifle SIZE FOR THE GUN, not some spec.
and then you can skip the sb die and the case gage
my berger 175's do about 1/2 moa from an early ar10(t)

Yep I size for the rifle chamber in my 4 308 bolt guns, which are set at minimum on the go gauge and the measurement transfered to the wilson case gauge. BECAUSE I chamber All my own rifles, with the SAME reamer, that I own ...and the AR 10s are then sized .002 to .oo4 undersized on the same setting. So now all my ammo precisely fits all 6 308s with the same case headspace setting on the die to cartridge chamber ... it's done that way on purpose. My ARs will do 1/4" 5 shot groups, sometimes 10 shots are under an inch. They all shoot under an inch and mostly 1/2" to 3/4" most of the time. The head of the cartridge case is only sized down 1/2 of one thousandth of an inch in diameter smaller than the fired case even with hot loads. No small base dies on any AR cartridge I own except 2 the 224 Valkyrie and the 6 mm ARC because RCBS made em that way. The AR 10 in 6.5 Creed is also a regular base die...and many thousands of rds of .223, 300 hamr, and 300 blackout fired in AR15s on regular base dies...works or me.