While you can shoot similar powder charges, you have to remember.. the accuracy might suffer and so might the shooter. Some of the recoil people are willing to endure, amazes me. When I shoot large conicals, I normally start them out around 65 grains and work up from there. If I hit 90 grains, that is really pushing one IMO. Shoot the powder charge that is most accurate and do not worry about the other guy. Just never exceed the recommended powder levels put forth by the manufacturer of the rifle of the powder maker.