I shoot the older model .357. Use both 150 and 158 from lazer cast and others. Have found that before you quit shooting run 4-5 jacketed loads through the gun. I read this in a gun mag. several years ago. In anyevent I never have to scrub out the barrel doing this.
James, A funny thing about what you say here about the jacketed stuff is....... If you ask 100 lead shooters about doing that, 50 of them will tell you to do it and the other half will tell you it's the worst thing you can do. Go figure!!