That lifted my eyebrow, 444 marlin, 454 Casull and 44 mag in a 410.
Watched another one they had with it too shooting the 444 Marlin and cut 410 rounds.
A long time ago, @ the end of the 19th century and beginning if the 20th, htere was a single barrel break open shotgun made that was chambered in .410/.44-40. I believe but am not sure it was made by H&R. So this was not that much of a surprise to me being that the cases and bullet diameters are roughly the same.
