Okay you gun guys. What is this round, who made it, and for what rifle? The bullet is not original, and is just stuck in there.
Limbaugh .500 Big Booma! IDK, looks like something designed for ether an AR or other semi to fit the magazines.
Leiter-Wise Rifle .499 Some links here: 499 LWR ammo ammunition single cartridge Leitner-Wise Rifle Co. lwr .499
Maybe not so obsolete just yet. Scroll down the store section, see the bolt head and carrier for the rebated cartridge. Our Legacy – Leitner-Wise LLC