Thanks, Hunterdn78. I plan to use 777 in the Optima. I hunt away from home and may not be able to do the cleanup that Pyrodex requires. I think that the 777 residue in a stainless barrel will keep a day or two until I get home. Actually, I think I can do a quick clean on it in the field and a better one later. I hunt in north MO, it does not usually get that cold there. Thanks again and good luck.