Yep! It's a modified #4, but I've never seen such a modification, perhaps this is due to a local gunsmith? The bore is in overall good condition, and it seems that it hasn't been too much shot; cases are perfect after firing.

I measure my bore 313" at groove, and 304" / 305" ont the lands. I figured I would order at Nei a 305" mold for pure lead, so I could have slighly "bumped up" my bullet with the alloy, or increase the paper thickness if needed.

In my opinion a 200 / 210 grs PP bullet would be devastating.