.22 LR to .22WMR


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Melvin
January 10, 2003, 11:24 PM
Has anyone converted a S&W revolver from .22 LR to .22 mag? Seems like it shouldn't be too much of a job,however I had to do a small lathe cut on the extractor star of a S&W 25-2 and had to use a carbide tool bit . The star was either full hard or case hardened.
Thanks Melvin

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DeBee
January 10, 2003, 11:36 PM
Not generally recommended...

The bore diameter of a .22RF is generally around .222 and the chamber about .225", not to mention the headspace difference between .22RF and .22WMRF.

For less trouble, you could just pick up a used Ruger Single Six with a .22 Mag cylinder. Bore is about .224 on these so mag ammo is ok but accuracy suffers with .22RF

Jim K
January 11, 2003, 12:37 AM
I don't know about that S&W, but in general the conversion is not a good idea, even aside from barrel diameter. The barrels on most .22 LR guns are made of fairly soft steel and the .22 WMR will eat them up in a pretty short period of time, what with the high velocity and the jacketed bullet.

Not to mention that some older .22's won't take the higher pressures.

Jim

GooseGestapo
January 14, 2003, 12:11 PM
Melvin;
I suggest you take your question to www.rimfirecentral.com.
There are a lot of highly qualified rimfire affectionados there that can help you with your project.
You didn't say what model you were converting. If it is a K-frame, it would be easiest to fit a new cylinder.
The bore diameter would not be a major issue with the Revolver as the bullet will be passing through the forcing cone. Be sure to polish and lap the forcing cone. This will improve the accuracy.

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