Hello everyone, this may not be the proper place to ask but I will give it a try. I have a custom five and a half inch bisley by David Clements. It shoots 7.5 grains of unique and a 250 grain lead head bullet very good, however I get leading in front of the forcing cone. Mr Clements said to try 16 grains of 4227 which I did and the leading went away, however it is not near as accurate. He said some guns will lead with unique but I hope this isnt one of them. He also said the gun wont leave the shop unless the dimensions are perfect, so that is out of the equation. Any help would be greatly appreciated. Thanks for any feedback.