My all time favorite was IMR 4350 for rifles (25 caliber) and Bullseye for my good old Colt 1911A1 Gold Cup. However, I too had a large collection of cans of powder. I also had just about every Federal primer available. Quite a collection.

Back on topic... Yep, I really cringe when I see someone under-prop an engine at the field, then claim it's so much better and faster with that noise maker turning 15K+. I've never seen one go to lunch, but I imagine it ain't pretty.. especially at that RPM. So, I tend to work with the lower RPM range to get performance, even though it's not in the power range stated in engine specs.. which I feel is somewhat overstated.

CGr.