Need advice on bullets for a build

[bulldog911]

I ha love had 300wm and 7mm, 6.5 and list goes on. I want to pack a lot more powder in a case a d still stick a 30 cal pill I. It. Or is that not right? 300wm is fast but need it fasted. It bucked the wind good also. Any caliber I should look into. Keep in myvi still need to send these through s 30 cal can. This is strictly a long range elk hunting rig. Thanks!