saddlesore has already covered it for me. Only I used 4831. """Take the .06, but stuff it with 180gr Partitions and H4350 powder. A Game King at 30 yards out of an .06,might not give you the desired results/. As for the pre 64 being a might heavier, I am 76 and I still tote mine around at 10,000-11,000 feet.""