What does the new 4" .500 weigh? It should be a handfull!! At least it would be packable. I used to own a Linebaugh built .45. We shot 310 Gr. cast at about 1450 as a steady diet. It was a lot of fun once you got used to it. I think I will wait for a single action before I buy a .500 though. they are a loy easier on the hand!