Sure Shot Mc Gee
New member
I don't know when manufactures decided to bored 410 barrels to 3" as my little Iver Johnson 410 a turn of the 19 th century shotgun originally shot 2-1/2 hulls only. Knowing that piece of info I took my shotgun to a store front Gunsmith and had my barrels chamber re-bored to accept 3". Shot load went from 1/2 oz to 3/4 oz. and that is a 50% increase in shot weight and doing that made my 410 a genuine 30 yard bunny thump-er.