Just switch to a harder bullet alloy. I use straight Linotype with or without a gas check for handgun bullets that I want to shoot at magnum velocities. It also works well in rifle loads up to at least 2,200 fps if used with a gas check.
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Where can you buy bullets cast with linotype that are affordable? I have had no luck with any commercial 158 gr SWC at velocity getting close to 1000 fps. All I get is leading and poor accuracy. I have used bullets from many commercial casters and have tried multiple powders in five different 357 magnum Smith and Wesons with no luck.