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Actual, real, patent H&H Paradox choking is not a standard-form rifling like you'll see in your Remington Model 700 or in the rifled choke tube that you buy from the sporting goods store

I seriously doubt that Holland and Holland would put their name on "any old back-bored 40 caliber rifle barrel" to be included in a multi-barrel set or dedicated Paradox gun

Development is the "fucking around and finding out" part of the process, and at H&H the process would no doubt revolve around their distinctive ratchet-rifled Paradox choking design -- or not -- but that would be on them.

They'd want acceptable patterns and shot density, and they'd want acceptable accuracy with the single projectile etc

They aren't going to do it for free

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