I shoot a lot of RST ammo out of my old guns. Guess they are 2.5". That said, there are a number of 12 gauge lite loads out there that are 2 3/4" and they will work fine. Doesn't take much lead in the air to knock down a gamebird a long as the ranges aren't unreasonable. PS. I do have a Fox 20 gauge Sterlingworth made circa 1937 and shoot standard Remington Game loads out of it (7/8 ounce). Don't believe I'm causing much of a problem and I probably only shoot a box or two a year.
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