[IowaShooter]

Well… a good outcome… they had sent optic in separate package… should arrive today

Found some risers at the LGS last night… ready to affix scope today and then take rifle to the range!

 

[Coalcracker]

I did my group test between the AR and my RAR. At 100 yards. The AR did terrible. I had some horizontal stringing with the RAR. I think it was me. The AR has 7lb trigger VS the RAR with a 3lb. I sure hope the AR improves as it breaks in.

 

[Oldoutlaw]

Were those your reloads? You may need to try a few different recipes to see what it likes best.

 

[Coalcracker]

Yes reloads. Im planning on playing with loads too. Im going to run some of my unique loads in at as a straight pull bolt. I should have tried that today. I was running them in my RAR. I had the AR loaded with CFE Black.

 

[Oldoutlaw]

Yes reloads. Im planning on playing with loads too. Im going to run some of my unique loads in at as a straight pull bolt. I should have tried that today. I was running them in my RAR. I had the AR loaded with CFE Black.

What is the diameter of the bullets you are using ? Also, you need to know the Bore Groove and Bore Dia. for each rifle. Makes a big difference if you are off on this. 7.62 bullets are available in.308, .310, .311, and .312.

An Official Journal Of The NRA | Handloading The 7.62x39 mm (M43)

The key to unlocking the 7.62x39 mm’s utmost potential is matching its projectiles to the bore diameter of the rifle in which they will be fired.

www.americanrifleman.org

 

[Coalcracker]

Im running Berry's .311 123 grain. I looked at the data.I have 2 other powders on hand. IMR 4198 and H335. I'll slug the bore then. If .308 i have 120 grain on hand. My RAR shoots good with both bullets. But i was concerned about gas cutting running .308 in it.

 

[Oldoutlaw]

Im running Berry's .311 123 grain. I looked at the data.I have 2 other powders on hand. IMR 4198 and H335. I'll slug the bore then. If .308 i have 120 grain on hand. My RAR shoots good with both bullets. But i was concerned about gas cutting running .308 in it.

I doubt either barrel is at .308. H4198 should be a good one as is the one you have now. I read on an older AR forum that BCA in 2018, I think it was, had a barrel dia of .312. .311-.312 is the norm for this caliber in rifles. You may just have to shoot a lot more rounds to break it in right.

 

[Coalcracker]

I slugged the bore with a 95 grain .312 coated cast bullet. It swagged it down to .306 on the flats. I couldn't measure the grooves. They were off set. So ill try .308.

 

[Oldoutlaw]

Hmmmm

I slugged the bore with a 95 grain .312 coated cast bullet. It swagged it down to .306 on the flats. I couldn't measure the grooves. They were off set. So ill try .308.

That doesn't sound quite right to me.

 

[Coalcracker]

I did some digging for others who had slugged at .306 and was successful
. Bear Creek upper blow up? [Archive] - Cast Boolits

A plus is with 120 grain .308. You can run them up 3000 FPS. I tried them in my 30.06 and no platting failure. My AR is a 1:10. Data for what i have in powders i can get 2500 and change. The owner of Accura outdoors told me this.

 

[Oldoutlaw]

I did some digging for others who had slugged at .306 and was successful
. Bear Creek upper blow up? [Archive] - Cast Boolits

That thread was all over the place. Call BCA and see what they say. Or email them.

 

[IowaShooter]

I’ll take mine back out and try at 100 yds. with a couple of types of ammo