10g.. I have had a bunch of 37s and I really like them.. When I was a kid 60 years ago several of my older cousins owned them in 16 g. The handled really well and those guys put a lot of rounds through those old guns. I always had a soft spot for them, b ut the one I have never owned is the 16.. Had a 20, and a number of 12s, but never a 16.. If I weren't so old I would still look into one.. But with the little bird hunting I still get to do, I doubt I ever get a 16.. Get one and enjoy.. I do like the older models.. I might be seduced in to an older 16 with a solid rib.. But I am not sure I ever saw one. Enjoy/..
