Reloader7-62GuestJuly 11, 2021 at 5:05 pm
My older Lyman #45 manual has load data using IMR-3031 listed for the 7 mm Remington Magnum using a variety of bullet weights including the Remington Core Lokt 150 gr. bullet. The starting charge weight is 45.0 grs. while the Max charge weight is 52.0 grs. so your father’s load is right in the middle. Powders used for a specific cartridge can stay the same over decades or change for one reloading manuals edition to the next depending on whom the author is and their bias they have towards certain powders. Personally, with all the inconsistencies you have mentioned, I would just pull the rds. down and salvage the brass and bullets.