I have a #3 frame 10ga NH of pre 1900 vintage that had been rebuilt several years ago by the DelGrego shop. Along with restocking and refinishing, 32" fluid steel barrells were sleeved in and choked "full & full" with 3&1/2" chambers. I sprung for a 10 round box of 3&1/2" bismuth and decided there had to be a better way and bought a set of 3&1/2" 12ga Guagemates. I had collected a couple of 12ga Black Cloud wads I had shot out of my 12 and found that they would fit smoothly/closely through the chokes of the NH. I tested/patterned some 3" and 3&1/2" steel 12s through it and they were tight and on center at 40 yards. I have not used it enough yet to prove anything.
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