Originally Posted by trout-n-salmon
I am building a 375 RUM to shoot the Barnes 350 TSX &/or the Matchking 350. I intend to have the barrel length 26" from recoil lug to crown + muzzle brake. What would you all recommend for number of grooves and twist rate to optimize the 350 grain bullet?
Thanks for the assist.
I would look for 6 to 8 groves.
The grooves are only 3 to 5 thousandths deep and the larger bullets are hard to get started rotating
and will sometimes shear the jacket unless there are plenty of groves and lands.
I have had the best luck with 8 groove barrels with 10 to 14 twist the 1 in 12 should be good for
the 375 rum because of velocity. the old 375 H&H did ok with the 1 in 10 (Slower).
For the 416s the 1 in 14 seems to be the best.
Barrel length will be ok (26") + the brake.
J E CUSTOM