357 Maximums
I shot silhouette back in the 80s. I shot (and still have) a Dan Wesson model 40. Like was mentioned, if you keep the bullets at 180 and up, no problems. The downfall of the Ruger, as I recall, was the cylinder was shorter than the DW and you could not do 200 from it very easily. The Dan Wesson cylinder is 2.075" where I understand the Ruger was 1.935." Doesn't seem like a lot but it was enough difference to cause problems restricting the heavy bullets. People went to 158s and even lighter in the Ruger and the flame cutting became a problem. The Dan Wesson came with 2 barrels and I never shot the second barrel yet because I never had any issues. Hope this helps.