How many shells can you reload using A grains of 1lb of powder?

Grain is a unit of weight. There are 7000 grains in a pound. The number of grains loaded intoeach cartridge will vary, dpending on the cartidge, and on the powder used. IF it were 7 grains per catridge, you could reload 1000 cartridges. Divide 7000 by the weight of powder for each cartridge.