I have two Taurus revolvers, one model 605, and a model 445. I purchased them together, and both had extremely tight cylinder/barrel gaps, the 445 the tightest. I could not get the smallest feeler gauge I had (0.001") in the gap, and after about two cylinder full of lead bullets, the cylinder jammed. It was pretty hard pushing the cylinder out. I removed the cases and tried to close the cylinder, but it was too tight. I did not attemopt to force it. Instead, I looked at the cylinder face, and the build up of bullet lube and powder residue was enough to create drag against the forcing cone. I returned it to Taurua with my observations and asked if they would open the gap a bit. I got it back in about 3-4 weeks, the gap now measures about 0.002", and wokrs fine. It has not failed again.
While the 605 is also tight (about 0.0015") it has not caused any problems. I shoot it more than the 445, and use both lead and jacketed fodder through it. I've found that it shoots 125 grain bullets as fast as my 6" S&W mod 28, which has a gap around 0.005-0.006". I'm well satisfied with both guns, and the Taurus service I recieved on the 445.