Along with the two slower than shotgun powders, IMR 4759 and VV N110 that ignite reliably with shotgun primers, that are easier to load for slugs, in heavy bbl can get 20% plus more velocity, I've found another. It is IMR 7383 $3 a lb surplus. Tested plastic 3" cases, perfect ignition with regular primers. 8 types of cases,600gr slug starting load 100gr. Full load 140gr giving 1800 fps plus in 24" bbl NEF.With loads halfway between start and full didn't even have to resize to shoot again.Full load just has a card wad under slug in 3" plastic.Wad just tight on charge, as no extreme compression of powder needed. Will next do heavier slugs and RMC brass cases. Ed
