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The Routledge Bore is an invention by Fred Routledge which consisted of the last 12"-17" of the barrel of a .22 bored to about 3/8" or .375" . This allows the tiny .22 shot payload to stop spinning from the rifling or in a fully smooth bore .22 to open smoothly in a sort of jug choke effect. The effect of the Routledge bore was to enable the .22 Shot cartridge to be effective at 15 yards or so on vermin,about 4 times farther than a .22 rifled barrel is able to deliver a useful pattern of it's tiny shot.

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13y ago

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