Pete, My experience has been the spreaders open the patterns 1+ choke size. IE: From Improved mod to improved cylinder. One thing I have learned is the the speed of the load is critical. If you overspeed the load it will blow the pattern and too light a load and the pattern will not open as much as you would expect.
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"Much care is bestowed to make it what the Sportsman needs-a good gun"-Charles Parker
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