[Ricklin]

20 gauge does not "kick less" than a 12. In fact they often "kick more"

It's all about the payload. A one ounce load in a 20 gauge will have more kick than a 12 gauge with a one ounce load.

I am speaking of felt or perceived recoil. The 20 gauge is usually a lighter weight gun. Thus pushing the same weight projectile, at the same velocity the 20 will "kick harder" than the 12.

The most effective and least expensive way to tame recoil is the weight of the gun. A 12 gauge for trap might weigh 9.5 or even 10 Lbs. Trap shooters will often shoot 200 rounds a day or more. The heavy gun really helps manage the recoil.