Welcome to the board. I would think either here or the revolver forum would be best place to discuss your sixgun. I can't help much with the big 500 as I don't own one. I do however make a bullet for the thing. The DC 500-400-K. I don't have a picture on our site but the bullet looks a lot like the DC 45-355-K or the DC 475-400-K, both of which can be seen on the bullet page at
www.creeker.net