If you want the 7.62x25mm, get it, but admit you're getting it because you want it. That's fine, but bears are really not involved at all. If you were getting a rifle in any case, an SKS with a Mojo sight would be a good bet, with powerful (compared to x25mm) but cheap ammo.
When I talked about friends who hunted black bear with .357s, I meant with Blackhawks. If you want a good concealable "do (nearly) anything" platform, something like a 3" Model 65 .357 is a good bet, and the bullets available in .357 will more than make up for for any penetration advantage the x25mm has. That still gives the reduced recoil, inexpensive .38 loads for plinking and small game. If it doesn't need to be concealed, a 4-5" S&W L frame or 4 5/8 or 5" Blackhawk would be a good bet. I'd personally go with the 4 5/8" BH, if I didn't need to conceal it.
John