My girlfriend shoots a Sweet 16, so I bought a 16 ga conversion kit for my Lee loadall2 and she loads for it. I took her S16 grouse hunting last fall and it was a joy to shoot.
When I saw an old Western field 16 pump in the lgs a few months ago for cheap, I reasoned that it only made sense, as I already had the reloading gear for it. I dont know if it's built on a 12 frame, but it's lighter than my Mossberg 500 12 ga and shoots just as hard. Counting down to grouse season.