I am about to begin reloading .375 H&H using 235 - 300 grain bullets. I have purchased H4350 as the powder of choice for my 300 grain SP and solids. I have a question on what primer to use with this powder. I currently only have Winchester primers and for some reason think I am supposed to be using a Federal model primer with this particular cartridge. Again, .375 H&H Magnum (belted) not a .375 Winchestor or .375 Remington cartridge, but the classis .375 H&H Mag. Should it be the 215?

Thanks for the help.