At that date Phil I'm going to guess 2 5/8 but it could be 2 1/2. You would need to measure it to be sure. But if this helps I've shot nothing but 2 3/4" out of all my Parkers, Foxes, Lefevers and even my Wm Ford damascus 20 with no problem. Of course I handload and keep the pressures and payloads down to sensible levels.
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Wag more- Bark less.
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