Did a ladder test with the Sierra 140 gr. Gamekings in my 6.5CM, except for two shots, all 18 went into the same hole. A ragged, elongated, 1 inch hole.
In my 6.5x55, using Nosler 120 Ballistic Tips, got around .6 inch with three shot groups.
H4350 in the 6.5CM and the 6.5x55, W760 tended to...