I am new to reloading and have a novice's question. I have been trying different loads/bullets in a 41mag revolver. When using H110, with jacketed bullets, gases were shooting out from the front of the cylinder where I could feel them strike my face. I saw no signs on the cases of pressure problems, but after only 10 rounds gray powder residue was all over the outside of this gun. I shot the same charge and bullet weight but with cast bullets and this doesn't happen. I have been trying to analyse what caused this (haven't shot any of the "blowbackers" since as it almost seems like the bore is too tight for the jacketed bullets, also seems that this would jump pressure thru the roof). Any info,ideas,experience, or info would be much appreciated.