Pet loads for me were 64 gr. of IMR4895 behind the .300 grainers...they hit within 3/4 in of each other in my rifle.Velocity was right at 2500 fps. Seating depth was always easy with the .375, seat them so they fit in the Magazine, or in your case...the chamber...
300 Horns. would be a good practice boolit, and we ( me and a pard..) used some on PG with great results..
Ingwe
