It takes more constriction in a bigger gauge for the same choke. I just found some data on chokes that's a little different than JA's. For the 10 it's .045/full and .030/mod. so I must have a mod choked gun. I have the Gold and Silver Gauge Mates and feel it was a waste of money to buy the Golds. Other than a case and brush the only difference is some of the lip is missing on the Gold. If one simple grinds off half way around removing some lip on the Silver you'll have a Gold that allows a shell to be removed while still in the chamber. George, my 10 is also 2 5/8. The chambers don't have a forcing cone but a step at the end. Believe it was made for brass shells. A brass shell would butt up against the step. That way a wad would be a perfect fit for the bore. If you think 7/8oz has a tight pattern, go to 3/4oz. Claybusters has a 3/4oz 12ga wad - call them and they'll send a free sample. Paul
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Paul Harm
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