Okay, some people say yes, some people say no. I'm in the "no" camp. The 10mm Auto chamber is not like a .357 Magnum chamber. Specifically, the 10mm Auto headspaces on the mouth of the case, and at that point in the chamber, there is a sharpish edge. If you shoot a .40 S&W in the longer 10mm Auto chamber, it's possible that the bullet will nick or shave this sharp edge on it's way out. An idea, which maybe not catastrophic in results both as to pressure and accuracy, doesn't agree with me. The .357 Magnum chamber is ramped, so a .38 Special projectile fired in same doesn't have anything to catch on.10 MM revolvers can or can not work with a 40 cal?
Having said the above, I've read numerous posts from owners of Smith & Wesson 610's who say they've fired .40 S&W in their 10mm Auto revolvers.