A small update, I would give this ammo a hard pass. Novelty round. Corbon moved from SD to somewhere, and currently doesn't answer their phones or email. Website is abandoned. No telling what the the bullet really is. Starline brass and a NOS bullet is the best guess. Whether this has any real world application, as opposed to the Underwood with a XTP bullet, who knows? Without a chrony and gel test - just no.