There are a couple of guys here with them.
Everything is custom, IE custom barrel and I think SSS can machine out the bolt head.
A 223 magazine should work.
I had one in an AR and my 89YO dad has a mini in 6.8 and loves it.
Its a deer killing machine out to 300 yards. With barnes bullets sledgehammer death to hogs.
We have never had one hog get away after being hit with a 6.8 SPC barnes bullet.
Very very light recoil.
Some guy out in Colorado killed a 5X elk at about 350 yards with a 110 gr accubond.
Artteacher over at arfcom killed a black bear with one so its a pretty leathel round.
To me its the best low recoil hunting round made.
BTW barnes is just now releasing a new 95 gr tipped bullet.
Still probably overkill for small eastern whitetails.
Skip the Remington crap ammo and brass and get SSA small primer brass. Good stuff.
The 6.8 SPC forum has every load you would ever want.
As far as barrel chamber and twist, 20" is good. You definitely want a SPC II or DMR chamber and no faster than a 11 twist. Some guys are shooting 12 or 13 twist.
All of that gets you less pressure.
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