I'd pattern a full first then screw in the modified and willing to bet the full is better. Alot of older shotguns had choke written on the barrel and were more than a full/ fuller choke more like an extra full constriction. Great patterns but sometimes it was believed to be from the longer forcing cones the older ones beared.
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living in FL but my home's in alabama! From Squirrel to Elephant, the Shotgun is your gun. sincerely, Blain
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