I've got a Superlative gas block, Falkor receiver, Faxon 16". Barrel had to be dimpled. Shooting Gorilla Barnes 210gr TSX supers. If using the carbine buffer doesn't fix it, I'll have my gunsmith do as you've recommended, thanks. 18 clicks out, it throws the brass at 1pm. 10 clicks 2pm, 7 clicks 3pm. After burning through half a box I decided to ask the internet because this ammo is no longer on sale. My reloading press is still virgin and probably going to stay that way unless the end of days. Reading above about the quality of the Faxon barrels, I do believe I'll have the bore inspected too. 308 kicks too much for me, I've got neck problems. Can't shoot 30-30 bolt action anymore. My next move if this 8.6 doesn't float my boat is to just make do with 6.5 CM and 7.62x39. I don't like to contaminate meat with numerous tiny lead fragments, my lead levels are already borderline high. 7.62x39 is plenty adequate for whitetail shot in the neck at 25 yards, but somewhat questionable for bigger hogs using copper bullets that don't kill as well, and I don't like to have to try to track animals just want them to drop right there. I have read that the uber fast ~3000 fps really kills a lot better, but somehow from a physics perspective, a 64% bigger in cross-sectional area 210 grain bullet traveling at 2000 fps feels like it should work as well or better than a narrow 120 grain bullet traveling at 3000. But I could be wrong. Hydrostatic shock maybe. Thanks again for your suggestions.
I just weighed the buffer it 3.8 oz...I use the same buffer and spring in 308, 6.5 Creedmoor, 8.6 blackout, 358 win,...
I see the delima, velocity opens the bullet to enlarge its crosssection, plus blasting bone, blood and tissue at greater speed, causing trauma and massive wounding, and a larger permanent cavity.
Using only factory ammo on a less popular caliber always limits your choices.
I do not know how well the Barns bullets preform at 8.6 velocities...or what range limitations the lower velocity may have...Hornady has printed limits on muzxle velocity vs expansion like 2500 fps min , for all hunting copper and lead except the 338 Marlin 200 gr goes down to 1800 min muzzle velocity.
So ya probably need more ammo or reload to get it tuned and lock back the bolt. I don't remember the size I drilled out the gas port probably .086 or .093" I believe it was .093"
So it runs supers and subs. So I went to check the 8.6 upper and it does not have an adjustable gas block! One of the few! Most are SA adjustable. So it's a Faxon gas block with a drilled out gas port...I was gonna count the clicks to close...but I remember being skeptical of this caliber and was going to make it work with the least expense...my barrel was horrible, the worst barrel I ever seen, galling and torn rifling, with pits...had to lap it with silicon carbide lapping compound and polish it ...so I could see some rifling...it was bad at the chamber and better toward the muzzle.
So with the 3.8 oz buffer and a .093" If I remember correctly gas port it will run.
What's nice about the 6.5 Creedmoor is their is factory ammo, with the 120 gr copper Barns it may be the way to go with respect to recoil management and killing power...the 338 federal or 7mm-08 barrel is available from Wilson combat....338 200 gr copper bullets at high velocity...but more recoil... 7mm-08 and 308 probably fairly close in recoil...
The 6.5, Creed is popular and available...
But don't give up on the 8.6 Blackout without a few tweaks.
Picture: My barrel is accurate with the big 300 gr Berger, the 225 gr copper is accurate enough for hunting...but the speed was like 1900 something... it needs more experimentation. It could be a real hog smaker at 50 yds...the potential is there, but I'd like a little more velocity...good luck hope it works out. Should be all ya need, open up the gas port, and 3.8 oz buffer.