There is 7000 gr of powder to a pound ,devide that by the load your using .
With the loadI use I can get 4666 rounds from 8 lbs of powder. I buy once fired 9mm brass for$10.00 a thousand ,pay $12.99 a thousand for primers and $39.00 a thousand for 115 gr FMJ bullets . And it don't foul my guns like Wolf ammo . You can do the math