I have a modern-made 16ga flint double with no chokes. All my loads are with FFg (or CTG) powder, and for clays, most upland, or snowshoe hares, I usually use 1oz over 2dr or 2.1/4dr, or 1.1/8oz over 2.1/4dr or 2.1/2dr, with #8 - #5 shot (usually magnum), depending. The gun's not a lightweight...