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Interestingly, SAAMI maximum pressures are the same for both .22 LR and .22 WMR. Ammo for both are typically loaded in the 20,000-24,000 PSI range. Bullets for the .22 LR are nominally .223" dia, where the .22 WMR is a bit bigger at .224" dia. Not a big deal at all with the soft lead bullets with which these are loaded.
When I bought my Single Six as a 21st birthday present to myself, I opted for the one without the additional cylinder. Don't get me wrong, it's really cool to have one, but its practical application is rather dubious. The .22 WMR really doesn't offer much more velocity than "high velocity" .22 LR rounds from a short revolver length barrel. It needs a rifle barrel to really stretch its legs. All it really does is triple or quadruple the cost of shooting it, while making a good deal more noise as well. Still awesome that you found it, though, and can re-acquaint it with its revolver.
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Jeff
'72 911T 3.0 MFI
'93 Ducati 900 Super Sport
"God invented whiskey so the Irish wouldn't rule the world"
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