In fact I bought mine from a guy who had bought it and was not given enough info about it. He was trying factory loads and very lucky he didnt ruin his frame or worse. It will handle loads similar to the 358 JDJ, However, the maximum case capacity is about 50 grs of AA2520 compressed. It certainly is sufficient for the .356 pistol though. Most gunsmiths will not chamber it for you, and I have heard people say that the ones that do are considered to be irresponsible. Robert