Winchester 572 is identical density as Longshot. They aren't the exact same powder, nevertheless the bushing chart for Longshot ought to get you in the ballpark to pick the bushing to drop the identical weight of 572. A box self-protection ammo would last be 3 lifetimes. Hence, alternatively that tediously https://handloadingsupply.com/product/572-winchester-smokeless-powder-4-lb/