To The Group I recieved this response to converting a RSM to 404 Jeffery and decided if there are other people out there who have had trouble like this? It make me nervous about picking up RSM's to convert to non-ruger calibers.

"Brad,

what you describe is exactly what I did six years ago, and I still don't have a rifle that will feed, even after a trip to Dennis Olsen, the "world's best 'make-it-chamber-right' gunsmith."

There's something about the magazine set up for the .375 (at least in the RSM) that makes it incompatible to ever chamber the 404 right. What's happening is the feed rails, which have been relieved as much as they can be relieved and still hold rounds in the magazine, force the cartridge to sit too low in the magazine. When the bolt picks it up, the bullet hits the feed ramp at too steep an angle, and the nose bounces off the ramp and the cartridge jams against the top of the chamber mouth.

So far, I've put about five grand into this rifle. That's a lot of money for a gun that was supposed to be a "cheap" alternative to a custom rifle."

I read with some significant concern GAHUNTER's post regarding converting a RSM. I know that Bowen did a 505 Gibbs Conv and there has been a sucessful conversion to 470 MoBogo. Does anyone know of any other caliber conversion taht have worked? I have a 500 Jeffery under construction. I just plain like this rifle. I'd like to know if it could work with other unique rounds. Listed are my idea's

RSM 375 - 375 RUM,416rem,470 Capstick, 500 Jeffery? 505 Gibbs
RSM 416Rigby - 450 Rigby, 470 MoBogo
RSM 458lott- 460 G&A, 470 Capstick

Thanks Brad