Im fairly new reloading but wish to have a good starting point for my .375 RUM and heavier 350gr smk bullets. does anyone have a good load that i could start with? I open to suggestions and have read Retumbo is one of the best for these larger magnums. I have Retumbo,H4350 and H4831SC avalible to me. Any help for overall cartridge length and power weight would be really helpful. Thanks!