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My 12 gauge Ithaca Flues
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03-04-2013, 01:02 PM
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Up through the first Ithaca Gun Co. NID-period catalogue, 1926, they state their 20-gauges are regularly chambered for the 2 1/2 inch shell. Beginning with the 1927 catalogue they give their standard 20-gauge chambering as 2 3/4 inch.