"In terms of 300 mags generally, what bullet-weights are you guys using and/or finding success with - either in factory or handloads? Thanks!"

I load my 300 wby with 200 grs Swift A-Frame. Behind the bullet I stash 80,5 grs of Norma MRP-powder to push it up properly. Sums up with very good precision. This is a perfect medicine for moose, elk and caribou or anything else on the northern parts of this planet, I guess.