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Old December 20, 2021, 03:07 PM   #1
Smoke & Recoil
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Krieghoff Drilling Information Sought.

I have read many times about European shotguns having 65mm, 2-9/16" or
70mm, 2-3/4" stamped on, but this ole gal has nether. I know it's 16X16X8x57JR (IR). Am I missing it somewhere ? Any help would be great.
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Last edited by Smoke & Recoil; December 20, 2021 at 03:21 PM. Reason: goofed
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Old December 20, 2021, 03:14 PM   #2
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More pictures.20211220_143120.jpg

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Old December 20, 2021, 03:18 PM   #3
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Old December 20, 2021, 03:25 PM   #4
Jim Watson
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It isn't specifically marked 70 so it is 65mm, 2 9/16", that is the default.
16.1 codes the bore diameter, near 16.99mm, .669".
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Old December 22, 2021, 05:17 PM   #5
Scorch
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You have a pre-WW1 drilling in 16 ga/7.9X57 (German Imperial proofs). The 2-3/4" 16 gauge shell did not exist back then, it was introduced between the two world wars. FWIW, the rifle barrel groove diameter is .318".
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