[tangolima]

I went back to check my notes.

For .357, the range rod diameter is .345" for normal grade revolvers, and .346" for match grade. There is another unofficial method to determine the ranging rod diameter in case you bump into a odd ball caliber. It is the land diameter of the bore minus 0.002".

Using pin gauge is an acceptable poor-man method. But make sure whether your pin gauge is a minus or plus set. For a minus set, the actual diameter is the indicated value less 0.001", the other way for a plus set.

You mentioned your revolver passed the test with .345" pin gauge. It is excellent indeed if all chambers cleared without a tick, especially .345" is the land diameter. That's why you don't have spitting, and the gun shoots well.

As far as I know (I'm not quite a gunsmith yet, mind you), this is the way to check range of the revolver. I wouldn't say it can be off by 0.006", more like 0.004" to not to have a tick. 0.004" out of 0.357" (1%) is no easy task, as it is for all chambers.

Hope this helps.

-TL