rd ball .44 is 140 grs, IIRC .45 colt fits
in a 410 chamber. So 410 is about 50 to the lb. 12 ga is said to be 12 rd balls to the lb,but that's not accurate, either. A rd lead ball, .72" in OD, would not weigh 583 grs. 7000 gr in a lb, divided by 12 is 583grs. The elongated 12 GA slug is 1oz, 438 grs. So a rd lead ball, 12 ga, would weigh less than that.