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John, i've found for my real small needles i use a Remington 20 ga 3 buck 6mm, which will fit snug in a 15/64 or loose in a 1/4. For the larger needles i use a Remington 12 ga 1buck 7mm which fits a 19/64 hole or loose in a 5/16. If i remember right, i think the Federals were a little larger in those same gauges.
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