DO NOT USE bullets that are larger than .277" in these 6.8 barrels, 99.9% of all .270/6.8 bullets made are .277" diameter. The chambers were designed for .277" bullets and all 6.8 barrels have a .277" bore so bullets larger than .277" will cause excess pressure and increased copper fouling. It seems some Cavity Back bullets are .278" and on top of that they are solid copper so check the diameter of the bullets before using them.
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AR Performance (ARP)
Hi performance 5.56 & 6.8 SPC barrels and parts since 2007
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Phone: 786-782-8209 8am-5pm eastern time M- Fri only