I really doubt S&W will ream the chambers, I think there are several members who would do it if you don't feel like attempting it. With the correct Manson reamer from Brownell's it isn't difficult as long as you go slow, use plenty of cutting oil, and keep the reamer clean. (Pull it out and wipe down 2 or 3 times per chamber while reaming).

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H Richard
SWCA1967 SWHF244