Well, gang, I think a shot cartridge for the .500 would be a nice thing to have. What would make a nice 1/2" (.500) diameter container that could be loaded with shot? Do they make plastic vials or test tubes of the correct diameter? Didn't I see .500 gas checks for sale somewhere? If the .500 case is based on the .348 Win, then why not get some of those cases, cut them off to cylinder length, and contain the shot with gas checks top and bottom? Your thoughts....