I shoot alot of cast lead target loads. I have noticed in developing two loads for two different guns that the harder I throttled the bullets the tighter my groups got. The guns a S&W 686 4" 357 and a Ruger 96/44 . The bullets were Magnus 200grn in the 357 and 300grn in the 44 both were flat base. The powder is Win 296 12.4 in the 357 and 21.5 in the 44. The primers were magnum pistol small and large as the cases call for. Now here's the kicker everything that I've read is that the best accuracy is given by a lighter load, but the heavier I load these rounds the Better they grouped. These bullets didn't lead more than normal there was no gas cutting and the bullets recovered showed this. This blows the hole cast lead bullets are for lighter loads all out of the water. I also must add that these are or just under the published max loads.