Rule 303
AH elite
Bugger the old 350 Rigby magnum was downloaded to what is 35 Whelen performance. Pondaro Taylor believed the 300 grain 358 bullets from that penetrated as deep as the 300 grain bullet from a 375H&H. So the 275 and 300 grain 358 bullets will penetrate a bit more than a 250 358. As you have the 375 then stopping at 250 grain bullet in the 35 Whelen makes sense.