Good point about the 10 gauge being a heavier gun and counter-acting the recoil of a heavy slug.
I will say this, you load it up with number 4 buckshot in a semi-auto and you have some kind of fire-power. I hunted with a guy back in NJ during the 70s who used a 10 gauge double with number 4 buckshot and I saw him whack a doe. The poor thing just crumpled up like an accordian. Just blew the animal right off its feet.