glen ring wrote:I've had two marlin .357 cowboys. Neither liked lead bullets at any velocity. The one I shoot often loves a 140 grain xtp at about 1300fps. I shoot a 180 grain xtp at about the same velocity when I shoot the 200 yard course. It is a great gun for PC but too light for big bore, in my opinion.
I found the same thing on my 357mag Marlin 1894(s). Couldn't get them to shoot plain lead (any weight, at any velocity, using any vendor's projectile or powder combination) into anything better than a 8" group... at 50 yards
(wouldn't put 3 out of 5 on paper at 100). Same guns shoot pretty much all jacketed, plated, and even gas checked lead into 2" groups at 100meters (or better) at a variety of velocities from subsonic to jacketed at 1900fps.
Judy uses a 357 for big bore CLA. 158gr at 1700fps AMV for CPTs and a 205gr gaschecked lead boolit running just barely 1200 once it reaches the 200meter point. Unless the wind is on the backside of the target, it is about 95% knockdown/reliable and 2MOA at the Rams. The 180gr XTP jacketed, while accurate, we found were often less than 75% reliable on the CLA rams... 180gr Remington Cor-Lokts were slightly better. Sil-TMJs a bit better yet, but the last two are impossible to find now.
just my .02,