I have started reloading 38 special, and soon gonna be loading 357 mag for three different revolvers. The firearms are a ria m206 with two inch barrel, a Taurus 605 with two inch barrel and a ruger gp100 with three inch barrel. The first round of 38's were loaded with a 125 grain cast bullet with 4 grains of win231. The rounds were really accurate, but the brass was really dirty on the outside. I assume that it is insufficient pressure being formed in the chambers causing the brass to not swell enough and letting a little gas get around it. If this is the cause is there any reason to bump up the charge and possibly lose accuracy. The brass is easily cleaned while tumbling. I still have quite a bit of room to bump up the charge. What is the consensus of the experts on here.