My first Whelen was a 98 Mauser built in 1968 before the round was adopted by Remington. My go to loading in that gun was the Speer 250 gr. Hot Cor over 56 gr. of IMR-4320 (old formula) which generates 2597 fps from a 22" barrel. I have used the 225 gr. Nosler PT in my 10.5" .375 JDJ and it expands well at those velocities. My two .358 Norma rifles are built on P-14 actions. These are heavy bullet elk guns which drive 250 gr. Speer Grand Slams over 2,800 fps, and deliver consistent one shot kills on bull elk. Been thinking about rebarreling my .300 WSM Striker to .358 Norma but have not gotten around to it.