Michael: Don't get confused here by some of these posts. The 40-70 does NOT use necked down 45-70 brass like the 40-65. The 40-70 uses generally reformed 30-40 Krag brass. There are several choises available from Buffalo Arms, but you need to know exactly what the application will be. As for Big Timber there are two gun manufactures there, Shiloh or C. Sharps. They are not the same either, so you best contact whoever is making the rifle and especially ask about the brass questions.........best regards IowaMichael said:Getting a 40-70 straight sharps.Need to work up a load.Wish to shoot targets.Which bullet style is best? Why? Which brass is best? Why? Which powder is best? Why?