the biggest reason is that I cant afford jacketed bullets for cleaners. I would like one good heavy gascheck bullet not only to try for game but to shoot once in a while to scrape the barrel. Sound pretty lazy dont I! Like you I have had very little leading with plain base bullets at any vel. in the .500 its just that I go out and shoot a couple hundred at a time some days and I feel better when I can shoot a jacketed or gas check bullet though it once in a while its probably all in my head but it seems like it helps tweek the last bit of accuracy out of my guns.