Guys,
I've mentioned how much i like the Krieghoff insert bbls for shooting rim fires in a shotgun tube! I still think a decent double or O/U shotgun with one of these insert bbls makes a "really fine" combi gun for small game!! And you can pull the insert bbl. out and use the shotgun for bird hunting when ever you want!!! "If" properly installed the first time, they then will go back to zero EVERY time you put it back into that shot bbl.!!!
Anyway, here's a couple targets showing how a couple of mine have shot in the past.
Drilling Man