My culcan 3 hp .30 has a slugged barrel at .3055 and avs .3063 shoot good just tight on probe closing i have not compared .3055 yet as im waiting on press and dies. I would imagine to small and your losing velocity with air blowby and to tight lose velocity on excessive friction ...like goldi locks will prolly shoot better when its just right...for my sake i hope so as i have lys invested just to be a little beter
 
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My culcan 3 hp .30 has a slugged barrel at .3055 and avs .3063 shoot good just tight on probe closing i have not compared .3055 yet as im waiting on press and dies. I would imagine to small and your losing velocity with air blowby and to tight lose velocity on excessive friction ...like goldi locks will prolly shoot better when its just right...for my sake i hope so as i have lots invested just to be a little beter
Was vulcan 3 stupid fat fingers and small keypad
 
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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 . :p
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.