Dogdoc,after re-reading your OP,one thing popped up in my mind;are the bullets you are using .357 or .358''?Have you measured them to see if they are as advertised??If they are .357 try to find some that are at .358 or,if you want to go the whole 9 yards,measure the chamber mouths of your cylinder.If the dimensions of the bullet is too small for the chambermouth,the accuracy will go out the window...and might collect some leading as an unwanted bonus.
Good luck!