The biggest problem with 3" 20ga is not just the recoil,but the shot string.Each gauge has an efficient shot to bore diameter ratio.When you pass that efficient ratio the shot sting lengthens.If you look at Bob Bristers book "Shotgunning the Art and Science" you will see that the 3" 20 with 11/4 oz of shot has a very long shot string at 40 yards.That is why you shoot at the lead bird and one 4 birds back falls.You will put more pellets on a crossing bird with 7/8 oz than with 11/4 oz because of the shorter shot string of the 7/8 load.
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Threaded Mode