I shoot BP 45-70 ,45 Colt and 44cal Cap & Ball. I was at a small swap meet gun show and got a good deal on 3 pounds of GOEX BP. There was 1 can 2F , 1 can 3F and the 3rd can was 4F.. My question is can I use the 4F the same as I use the 2F and 3F ? In 45 Colt is use 27 grains by volume of either 2 or 3 F. In 45-70 I use 65 Grains of 2 or 3F with either a 405 or 500 grain bullet. If I use the 4F can I use the same loads or do I need to reduce the load ? If I need to reduce the load I ask by how much?