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Nope, never heard of it done. Not sure the 66 is up to the challenge. Maybe 40, but I would say definitely no on the 10mm. There is a guy, Dave Clements I believe, that converts Ruger GP-100's over to 10mm. Nice finished product, but the conversion starts out around $600. For the cost of the GP and the conversion you could have a new S&W 610 and a trigger job.
I can't see how it could be done either but over at the Greybeardoutdoors forum (??) sometime back there was someone who had posted a conversion to ,40 S&W I think to a Model 19 done around the Spokane area by a gunsmith. He claimed that if the loads were kept "light" the gun had no problems. I wonder if it was the same outfit that made the .44 Sp Ruger Sixes?
S&W did it with the L frame (646) not the K. The K will not handle it. I wonder though if a 646 could be bored to accept 10mm. I have seen a very nicely done M28 converted to 10mm. Smith also made the 610 on the N frame.
If I were going to attempt such a thing and for whatever reason did not want a gun as large as an N frame, I would most likely look at a GP100.
The K frame S&W is not up to the task. It was designed as a lightweight revolver for .38 Spl that can fire .357 mag. If you open the cylinder you'll notice the bottom of the barrel isn't perfectly round, this is the weak spot of the gun.
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