I Could be happy strolling the earth, for all big game, other than dangerous, with my 300 H&H and M70 7x57.
I sure miss my Ultra light (5lbz 2 oz scoped) .260 mountain rifle
and long range rig a M70 in .264win , but the 300 H&H and 7x57, could cover most of the capabilities,
If you want to have a few shots with a 300 H&H, (300 win) are essentially the same, I can lend you mine to go to the range.
cooper's are hefty, A 300win mag, won't be a problem,