Looks interesting, but is it jacketed or plated? I would think it would have to be just plated (thinly) to be soft enough to let the hollow base expand to seal the bore.
At least it will be nice to just have to buy one bullet for all my .50s! The ad says it will perform flawlessly in all .50s and since I own 1:28 - 1:32 - 1:48.......... sure will cut down in inventory!