If you have a .45 caliber rifle, try a .440 caliber ball/.015 inch patch with 60 grains of real 2f black powder. These are good starting places for you to find what your gun prefers. If you have bought a used gun, ALWAYS have a knowledgeable black powder gunsmith check out your gun before firing any load.
The size of balls are measured using a Heidenhain Certo 60 to an accuracy of 10millionths of an inch and is calibrated using standards traceable to NIST. Most balls are produced to the AntiFriction Bearing Manufacturers Association ( Book 10), military specifications, or our customers' needs.