You would need to slug the barrel and measure groove ridge gently with precise calipers. That’s your barrel diameter, guaranteed AVS has that diameter. Good luck. If you don’t know how to slug a barrel, watch Air velocity sport on YouTube, specifically epic 2 slugging barrel and range shooting. Key in on slugging technique.I shoot 218 h&n slugs very good but very few measure 218 most 217 or 217.5 . As to bore & groove all I can say is at my age I am a bore but lack groove .
That isn't necessarily true. Too many variables in barrels for an assumption like that.I willassume that a barrel that is .218 would not shoot smaller diameter slugs very well or as well as a .218 . Correct me if I am wrong but what about a .217 barrel shooting .218 . Any experience with and conclusions about this would be much appreciated . Muches grabass !
