I ran .357 Federal HSTs through mine once..... ONCE! Mine being a 340. Aside from how awful I found it, there's a better than even chance my wife will have it on her from time to time so between that and abusing my wrists, I keep .38s only in it. I'm out of them now but as with my .41s, and .44s - I have a couple of loads that I built *magnum* cased Special loads for. Regardless the points of view which might exist to the contrary - if I can limit the jump to the cone, I like to do so. Todd.