Thank you... it did seem excessive to me as well. But it seems that finding some definitive specs on this is a bit difficult. I just emailed S&W to see what they say. Unfortunately I am the second owner of this 460 so I get no warrantee.

Now the 460 cylinder yoke is a bit different than other revolvers with its front yoke ball detent. Will shims still work on this type of cylinder with the skinny extractor rod?

And shims would space the cylinder rearward correct? In other words, shims do not change cylinder gap measurement, just end shake?

Thank you for the info.