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S&W Revolvers: 1961 to 1980 3-Screw PINNED Barrel SWING-OUT Cylinder Hand Ejectors WITH Model Numbers


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Old 03-21-2023, 05:48 PM
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Default Groove Diameter On 22 WMR

I looked high and low but I cannot find the groove dimensions for S&W RF models with the aux cylinder options. A member has posted about having a cylinder rebored to WMR and I know that the mag is a small bit larger but I'm curious about the barrel diameter.
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Old 03-21-2023, 06:36 PM
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22 Long Rifle: "SAAMI specifies a nominal bullet diameter of 0.2255 with a tolerance of -0.004, while the specified bore diameter is 0.222." Groove diameter should be .223. In reality they'll vary a little. WMR is .224 but a little more or less too. I've never had a problem shooting 22 WMR in 22 LR S&Ws or Rugers or Colts.

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Old 03-22-2023, 09:54 AM
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minus .004 sounds like a recipe for leading. No wonder .22 rimfires show a preference for different brands of ammo. I suspect that the low velocity of 22's contribute to the lack of leading problems. When you get the velocity up to WMR levels the jacket saves the day.
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Old 03-24-2023, 10:18 PM
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I used to own a Ruger Single Six Convertible that shot 22WMR ammo fairly accurately but not 22LR ammo. Ruger told me that because a 22WMR bore is slightly larger the 22LR bullet fits just loosely enough to degrade accuracy. I guess that given manufacturing tolerances, shooting 22WMR ammunition through a 22LR bore could cause excessive pressure if the tolerances were off in the right direction. But many others have stated that their convertible revolvers shoot both types of ammo accurately.

Ed
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