CptCurl,If you have any doubt that what NE450No2 is saying, let me tell you I have personally witnessed the rifles, and loads being shot first hand. His formulas seem to work accross the board. I have personally had several doubles that would print two or three weight bullets in the same general group at 50 yds, of course with each weight utilizing it's own powder, and load. That is only done by finding a regulating load for each weight, and bullet. Of course, there are some doubles that simply do not follow the rules.