How safe is a S&W M34-1 rechambered to a .22Mag

I'd be more concerned that the LR-positioned firing pin would give good/constant ignition with the little bit larger diameter rim of the .22WRM; and the barrel's bore/groove diameter being suitable/accurate as well. Great point. .22WMR seems to be built to a higher grade than bulk .22LR is, but both are relatively thin in the case head, and must be by design. Hit it in the WRONG place (yet still detonate it) and you've got gas leakage, and that is NO small problem.

To further discuss your second point about the bore/groove diamter-- it's been said that the Ruger Single Six Convertible's barrel is built to a jacketed .224" bullet spec, and "also" runs the ever so slightly smaller diameter heeled .22LR slug, and that accuracy -MAY- lack a bit when running .22LR in a platform designed around the .22 WMR.

I simply do not know if this is truth or internet rumor fodder, but it begs the question of the barrel's bore diameter in the Smith & Wesson Model 34. If the bore diameter is designed around a heeled, lead or copper-washed .22LR slug and not a true, jacketed .224" barrel, you'll have issues right there, specifically with regards to increased pressures.

Dangerous pressures? I wouldn't imagine so, but perhaps outside the design.

The project sounds like a Rube Goldberg at every turn. And when you consider the attractive Model 34-1, there's a very nice revolver that gets corrupted in the middle of it.

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Attention Brass rats and other reloaders: I really need .327 Federal Magnum brass, no lot size too small. Tell me what caliber you need and I'll see what I have to swap. PM me and we'll discuss.

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