That question sounds simple enough, BUT it ain`t. mbklatt gave you some data that reloaders can use with canister powders. The thing is the ammo manufactures do not use these canister powders, but use powders that may very in burn rate quite abit from 1 lot of powder to the next. They presure test every lot of powder and the amount of powder in a round can very from 1 lot of ammo to the next. You can pull a bullet and weight the powder, but it will be different with the same load from a different lot.