As far as the accuracy debate goes, the 20g is a little more accurate than the 12. The reason is that the projectiles ( usually .45" diameter ) are closer to bore size ( .615" inside diameter). The 12g with .50" diameter projectiles and .720" ID barrels. That means 20s have thinner, easier to shed sabots and easier to stabilize slugs. This is out of the October Buckmasters magazine. I know for a fact that my 220F loves the 3" Accutips. I sighted in my new gun at 50yds. and it hits the 100yd target in the same place which tells me that it's pretty flat shooting. The 12 may have more knock down power but my H&R 20 would knock the crap out of a Deer out to 100yds and without the added recoil of a 12.