Ruger LCR or SP101 9mm cut to accept 357??

[danez71]

General question but specifically thinking of the LCR and SP101 9mm.

Can you have the cylinder worked over to accept 357 or can you only have a 357 cylinder cut to accept 9mm?

 

[reddog81]

Who will machine a .357 cylinder to accept 9mm? I'd ask whoever does this.

The rounds aren't really interchange and you'll have problems due to cases size variations between the wide base of the 9mm and the much longer .357 rounds. I'm sure it's possible to make it work but I don't think it'll work very well. Usually .357/9mm conversions involve separate cylinders.

 

[Monster Zero]

General question but specifically thinking of the LCR and SP101 9mm.

Can you have the cylinder worked over to accept 357 or can you only have a 357 cylinder cut to accept 9mm?

Whichever one you have, go buy the other one and don't mess with either of them.

Then you'll have two.

 

[C0untZer0]

The portion of the 9mm chamber forward of the case mouth can be reamed out, its usually 9.03 or somewhere thereabouts - its a 9mm freebore, but there is no support for the 357 case at the back of the chamber. The 9mm cartridge is 9.93 mm toward the base, the 357 magnum cartridge is 9.6266 mm at the base and straight-through.

 

[mcb]

I know TK Custom will take a 357/38 revolver and re-chamber it to 9mm. After he does the work it will accept 9mm on moonclips or 357/38 with or without moonclips. I wouldn't be surprised if he would do the same for a 9mm revolver, wouldn't hurt to ask him.

 

[gotboostvr]

you'd trash your 357 brass and possibly have wonky extraction due to buldging where the case swells to 9mm dimensions.

 

[mcb]

I have no personal experience with the 9mm conversion all though I am thinking about having it done to a Model 10 Heavy Barrel I have. According to TK Custom once the conversion is done you do need to limit your pressures to ~34,000 psi. If you shoot 9mm +P or hot 357 Mag you will have sticking issues. But you can use moonclips!

 

[Tallball]

I did the opposite, sort of. I recently bought a 9mm cylinder for my 357 Blackhawk. It fits just fine, and now I can easily shoot 9mm, 38 special, or 357 from the same revolver. It's already proven to be very convenient. I had read that sometimes the spare cylinders might not fit a different revolver, so maybe I got lucky.