I do have the 357 - 9 convertable, to tell the truth it stays in 9mm all the time as I have 2 ruger 357s that dont convert. I reload and use a 125grain 358 RNL bullet as the barrel is 357. I put them in the 9mm shells and thats not a problem, gun is very accurate using the 358 bullets. A 9mm bullet is 356 and I've had them tumble when used in my convertable, the 358 bullets never tumble and are better shooters. The gun is a sweetheart to use, I don't keep track of how much ammo I've put thru it but I shoot it once a week and usually throw 150 rounds down range and I've had it a few years. Charlie