With a good high quality custom made home grown gas check, an alloy of 50% range scrap and 50% WW, the proper sizing, and a good heavy double coat of JPW I consistently shoot 2300 fps with 150 gr boolits out of my 30-30, and 2500 fps with my 30-06. There is no leading when I am done shooting.
I don't heat my boolits or the JPW I just dump 'em both in a plastic jar and shake, stand up base first on wax paper to let dry. 24 to 48 hours later repeat the aforementioned steps then load and shoot. If sizing and or gas check seating is required size in between coats of lube.
Best wishes from the Boer Ranch,
Joe