I have a "mutant" version of a trooper. The frame is from a trooper, with the "V" mainspring. The barrel is from a Colt Python Hunter. I have no history on the gun, I bought it used through the Gun List many years ago. Is it safe for .357 mag loads, or is it for .38 special only? I've fired a few mag loads through it with no problems, but mainly just 38 special wadcutters.