I am about to build a .300 H&H however, sometime down the road, I may rechamber it to .300 RUM.

In either case I never shoot bullets in excess of 180 grains and really like to shoot 150's and 165's.

My question is what rate of twist should I use. My .300 RUM has a twist of 1 in 12. My .300 H&H has a twist of 1 in 10.

Which should I use? I would appreciate the forum's thoughts.

Thanks in advance.

If you PROMISE SOLUMNALLY never to shoot any bullet over 180 grains, then go ahead and rifle it 1/12"!!