i noticed after shooting my dan wesson that there was excess lead splatter next to the barrel. my head spacing was correct. then i realized the cylinder wasn't aligning right on every shot. looked it over. i've always felt the lock up wasn't the best. but now i decided to do something about it. i saw the arm could move left an right about .014". definitely, your revolver needs a tune up if you see lead splatter on the left side of the barrel. my cylinder wasn't aligning on every shot and so rounds were being shaved as they entered the rifling.