For my Alaskan Grizzly hunt this past Sept I settled on 65.9 gr of Big Game with the Nosler 286 gr Partitions. I seat them long to reduce pressure and yet still had plenty of room in the CZ550 mag. Accuracay was just over 1 MOA, but velocity was 2497 fps. Use Lapua brass and WLR primers.

Ended up taking a large bull moose w/ my 45 LC @ 15 yds. whistle