Use heavy bullets (158 - 200 gr.) at moderate pressures. Going with a fast light bullet is not the way you want to go with a rifle shooting a pistol cartridge. You will be able to reach velocities very easily that will cause the light jacketed bullets to come apart rapidly. I like to use heavy cast SWC flat point bullets in all of my lever guns. I have a 180 gr. cast load that is easy to shoot and packs a serious thump on the target. The .357 mag. in a rifle barrel is much more powerful than it is in a pistol barrel. Much more. It also shoots a much flatter trajectory than I would have believed. Elmer was right again.
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