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Joined: Aug 2006
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Sidelock
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Spent a couple of days googling, but came up with only "fairly sharp". How much is that in inches or mm per turn? Especially interested in 12 and 20 bores.

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Don't have an answer that I am willing to stand behind. I know the Westley's were changed slightly.

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Must be pretty hard to measure, with the rifling so short AND progressive. I've met only one positive figure on this topic - the Buturlin-Matska Paradox, 20 bore 24 gauge, had 1 in 900 mm. And 7 grooves, just like Fosberry's patent. The Russian sources have it as if Buturlin invented small-bore Paradox rifleing, a few years before Holland and Westley came up with their own 20 ga. paradoxes (the hint being that the wily Brits picked up the idea from an innocent naive Russian lawyer-ornitologist-gun guru). I'm wondering.

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In what year did the Buturlin appear?

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Sidelock
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Matska took the order some time in 1898 and the gun was completed around 1900

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Holland didn't adjust or reinvent the paradox for each gauge. Even though they didn't release a 20 until after 1900 it followed the same format as the 12.

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up to the twist rate?

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Haven't held a Holland 20 between my hands and can't measure minor variances in the twist with certainty but the 8's 10's and 12's don't seem to vary. One other point, Holland and Westley were just as concerned with patterning their rifled choke guns as their accuracy, I would think more so with a 20. Westley Faunetas have a three groove choke. With the rifled choke guns all the "magic" is in the that last several inches of the barrels.

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I thought as much. Thanks.
And by the way, I don't think Fosberry's patent mentions bore size or twist rates.

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1 turn in 36"

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