I was gonna say the dime test is for 12 gauge shotguns only. It won't fit in the barrel, much less the choke area of 16 gauge shotguns.

Your 16 gauge is probably a full choke. Most guns sold in the old days were full choke.

My first shotgun was a single shot 16 gauge -- full choke. The first one I bought was a 12 gauge and I was a little leery of getting one that only had a modified choke.

Times sure change. My duck gun these days usually sports screw in chokes of CYL in the first barrel and IMP CYL in the second.

I also use these combos with lead shot for upland birds. And..... it works real well in shooting 5 stand with trap loads as most shots are within 35 yards.