"if you're after a proper groove diameter projectile shooting 'bore rifle', you're (for the most part) shopping for an antique." That is exactly what I'm looking for. I don't like the sabot slugs. I've been trying to find one online but so far haven't even found one. Think I'm not using the right search terms. If you don't mind tinker could you measure the wall thickness of the barrel on your 16 gauge?

"If you are thinking of making up a conversion, look for a 12 gauge with a Greener crossbolt. I did one of these on a 16 gauge and it really didn't work out very well, not enough steel in the breech area to do a good conversion." was the conversion a 16 gauge rifled shotgun on a 16 gauge? Or did you downsize the bore and use the larger frame? like a 20 gauge bore on a 16 gauge shotgun?

Anymore suggestions for me to think about?

thanks again,
mike