With a 1:13 (my old one was 1:12) I could never get it to shoot heavier projectiles. Try a 50 gr or even lighter...Mine really liked the 45,50 and 35gr vmax. The slower twist really lends itself to faster lighter projectiles. I never found one over 55gr that wasn't 2" or more at 100m but the 435 and 50gr were mostly same hole...
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