I know this is an old thread, but see if this works. Check the case mouth of your reloaded ammo, see if you are removing the bell on the case completely. If not maybe take your micrometer to the chamber as see if they are cut to spec. Might have to call S&W to get the dimensions you need. Does this happen with new ammo as well as reloads?
"Have a gun, stack the deck, load the dice, and cheat."
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