Guys for what it's worth I've been trying tac in my wife's tactical 6bra... I started at 28gr and worked up to 31gr... at 31gr I began seeing the slightest of shining on the case head and I stopped... the 29gr load was a very small clover leaf in the high .3s and average velocity of 2723fps for corrected drop but the chrony showed 2785fps... it's a keblys atlas tactical action, 28" brux barrel, TT diamond... I will be trying N135 next and then possibly varget after that