I have a number of convertibles. Of course I have a Ruger Single Six .22LR/.22 WMR, a Ruger Blackhawk in .38-.357/9mm, a Ruger Blackhawk in .45 ACP/.45 Colt, and finally (I believe) I have a CZ52 with barrels for both 7.62x25 and 9mm Luger. They all shoot well enough. I don't think any of them will be considered by the Olympic shooting team, but they are accurate enough that I would never tell the difference in caliber by shooting under field conditions. Possibly from sandbags you could determine that one of the calibers shoots better than the other, but I haven't spent a whole lot of time shooting them from sandbags. Actually I bought them all for use with the primary caliber and having the extra cylinder/barrel was just something that I thought was nice. I never shot the second cylinder a whole lot. I think it adds some versitility to the whole package and would certainly do it again. For example, if you like the Ruger Blackhawk anyway, why not get a convertible ? Even if you never use the second cylinder, you have it there if you ever decide to. I think the last time I used my 9mm cylinder was when I slightly overloaded some 9mm ammo. It wasn't anything drastic, but I wasn't comfortable shooting them ouit of my 9mm autos. I was going to throw them away until I remembered having the second cylinder for the BH.