Just thought I'd share my most recent findings with my 300 wsm. Rifle is a savage model 10 center feed with a 27 inch 10 twist Hart sendero contour barrel. With the 230 hybrids at a 3.220 oal I am getting 2850 fps on the nose with single digit es and sd. Barrel is still in the break in process but is already showing promise with several 5 shot groups in the .1's and .2's. So far it appears case life should be exceptional with Winchester brass showing little to no expansion at the web and primer pockets are staying tight. All in all I am extremely pleased the rifle should be a serious long range hammer.