More Apples to Apples. I Have a Beretta 687 O/U with two sets of barrels . 12 & 20 length weight and balance identical. Shooting 7/8 oz loads 12 or 20 it easy to forget which barrels are on the gun. In theory the 12 ought to pattern better than the 20 never checked to see.
On the other hand have Trojans 16 & 20 that are near identical. 16 weighs 2 oz. more & LOP is 1/4 inch shorter than the 20. With 3/4 oz loads felt recoil is less with the 20. LOP must be the difference.
Felt recoil is subjective though somebody else likely different .
William
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