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Need advice on inconsistency using 100 gr Nosler BT in Sako L61R 25-06 w/ twist 1:9.5; Loads are IMR 7828 SSC 53.5gr; COL 3.200". Nosler custom brass +/- 0.5 grains wt variation; groups range 0.38 to 0.63"; most results are 0.50-0.63". Cannot get consistent 0.38 results; I have tried 55-57.0 gr...