John,

Thanks for posting. I liked this video, particularly seeing round in very slow motion hitting a steel plate and breaking into basically lead dust.

I guess the loads are really NfB loads.

I have seen a couple of 4 bore double rifles and it is always amazing how massive they really are. One I remember most was cased with verious accoutrements and was highly engraved with loads of gold inlay. I doubt that the maharaja ever shot it and if he did, likely it was shot only once and then put into thye gunroom to show off to friends.