Ok second try, this time by the rules:

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Same gun: Stag Varminter (Model 6) with SWFA 16x FF
Black Hills 69gr. MKHP
28.3mm = 1.114 OD, .89 CTC left target (fliers were shots 1 and 2)
30.9mm = 1.212 OD, .988 CTC right target

(.89+.988) = 1.878/2= .939

Last edited by Fiddy; 06/07/15.