Fat pins and a Hornet's 45,000CUP just don't go together in my experience so far. If the Hornets are loaded down - perhaps as I did in an unlartered Martini conversion. With factory ammo, the primers cratered badly and leaked more times than not. Bushing and small pins solved that.

Most modern .410 shotgun pins should be able to be bushed, I'd think. I still like the idea of a 2 1/2" or 3" .416 or .420" cal., grove to groove Black Powder Double rifle for cast bullets on a plastic .410 case. Should make a great deer, goat and pig rifle.