We played with exactly that scenario this past weekend My 2 daughters, my son and I, ran through about 600 16 bore loads in 3 different doubles, a Stevens, a Cz and a "G" Lefever. We shot short shells in one bbl and LP handloads in the other, a number of times. All shooters tried the test. Which recoiled more? The short shells...in all guns.We all agreed on that. I dont know what chamber length my Lefever has. The load I am using is 1 oz shot, SG16 wads in both Fiochi and Federal/estate 2 3/4" plastic hulls.......pressure supposed to be under 7k, velocity 1220 fps...Non Scientific eval..FWIW