West Calamus
Well-Known Member
First 10 shots out of new 300 win mag with Shilen barrel. First 5 was IMR 4831 - 67,2 gr. 200 gr. Sierra gameKing, bullet jump- .120 and M.V. 2862 fps. Second day another 5 with exact same load but with a ,090 jump and a M.V. of 2743 fps. Temp was within 5 degrees each day. Seems like a awful lot of M.V. variation with only a COL change or am I missing something else you think. Each group was only 3 to 4 fps up and down from average velocity.