8.6 Blk reloading info

[bodhisafa]

Depends on the twist rate. A 3 twist is limiting. My 3 twist could not take the same loads as my 6.5 twist with copper bullets...the 3 twist reached max with 2.5 grs Less powder with copper bullets...but it was a rough early Faxon 3 twist, also inaccurate.

I have not tried the 124 gr hammer in 8.6 blkout.

I use a bolt gun 6.5 twist with a 24" barrel, dropped the Faxon 8.6 blkout 3 twist is now a 375 Raptor with a 20" barrel.

My 8.6 blkout with 6.5 twist and hybrid cases shoots Barnes 160 gr at 2800 fps 200 Speer at 2600 fps.
The 350 Maker at 1800 fps with no blow up in 6.5 twist.
300 gr SMK at almost 2000 fps.
The little Maker 165 gr high velocity is for the 338 Spectre and limited ro 2100 fps but ive shot them to 2300 in the 338 ARC imp.
I haven't pushed it to 2800 in the 8.6 blk as it may come apart copper or not.

But I also load the worlds fastest 338 ARC improved at over 3700 fps.16" AR 15 6.5 twist.
The 338 ARC imp 16" AR 15 is about as good as a heavy AR 10, 8.6 blk 3 twist, in a 12" barrel and will actually shoot many bullets faster, especially jacketed lead.

These light bullets go fast but have limited range...unlike a 160 gr tipped Barnes at 2800 fps.

What bullet was this?

 

[45-90]

What bullet was this?

I guessing on the bullet....you mean, the little AR 15 338 ARC Imp running over 3700 fps... the bullet is a 9mm 50 grain copper, re-machine in a lathe collet to .338"... also used in AR 15 9 mm 16" at 2640 fps, and high velocity 358 win loads.

 

[MSBR.]

I’m guessing the limited range is from the low bc bleeding off speed?

My idea would be to slow the twist down to maybe 9 or 10 twist since I don’t plan on shooting anything heavier than 185 grains.

Building this for hogs.

Try experimenting with slow, heavy projectiles. I did this with 6.5 CM before the hybrids were even a thing. I pushed a 150 projectile somewhere around 2450 fps out of a 16” gun. It went transonic around 900 and had better performance in the wind than lighter, faster projectiles pushing above 2600 fps. Plenty of people are putting down all kinds of animals with a similar set up in 8.6, including hogs.

 

[45-90]

I built a 6 lb 308 AR 10 16" barrel, titanium, carbon fiber, magnesium upper.

It's lighter than my AR 15s.

It does 2442 fps with 208 ELDM.

Beats carrying a heavy AR 10 in 8.6 Blkout for range and potential killing power.

155 gr 2875 fps with Sierra Palma.
168 ELDM, 2756 fps.
308 sub moa, cheap to shoot, huge variety of bullets, magazines, etc.

The 8.6 Blk is mainly a sub gun...thats why most buy it...it has little range potential with supers and the 3 twist. Poor BCs at low velocity.
I increased it super potential with 6.5 twist running 200 grs to 2600 fps in 24" bolt gun.

High velocity kills alot better for general use.

The standard 308 put more energy on target with supers, cause it has more powder capacity and new bullets with good BC for any reasonable range for hunting hog or other game.
My 16" 308 AR has 1200 yd upper turrent dial if needed 168 eldm at 2756 fps to go long for targets...not game.