FrankTripuckaGuestJuly 11, 2021 at 5:05 pm
I think that IMR3031 is not an appropriate powder for this caliber. I see zero data in any of my books for it in 7 mag and 150 grain. It is a fast powder so better suited to lighter loads or smaller calibers. I saw one load in the Sierra manual of 54 gr for a 120 bullet. That is all I found. Your dad probly worked these loads up. Me? I would pull the bullets and dump the powder, then salvage the brass.