According to DGJ tests, it will decrease chamber pressure by about 300psi ( out of maybe 9000psi total) which will in turn have a small effect on recoil pounds. You might get 19 pounds of recoil instead of 20.
Not significant to me, but its not my gun and not my money.
Some people desire these 0 frame 16's because of light weight and some get close to 6lbs, but these light 16's are notorious as hard kickers. If a person wants one for hunting in which he carries a gun all day and gets off a few shots, then maybe recoil doesn't matter so much. If you are concentrating on the bird and wearing a coat, you are probably not even aware of the recoil. But if he is going to shoot a round of 100 sporting clays, maybe the heavier gun is the better alternative. Playing with chamber length to reduce pressure and velocity ( velocity is part of the recoil equation) is only going to help by a very small amount. The reduction in chamber pressure is insignificant to a strong barrel.
I have several 16's in fluid steel and damascus, all are around 6 3/4lbs and are 1 frame ejector guns. I'd like to find the right 0 frame 16 some day, I shot one in SoDak that was a great little gun. The lightest of the 16's seem to be the plain wood, 26" extractor guns, which are usually V grades.
Even with a 6 3/4lb gun 16 , I like these 7/8 oz 2 1/2dram loads, much nicer on my shoulder than the standard 1 oz 2 1/2dram load if I am shooting a round of 100. But of course a big, meaty guy might not even feel the heavier loads. I'm kinda bony.
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