If you are restricted to only CCI primers you'll have to run the springing not much less than stock and a full strain screw cranked in tight. I would just run it with the stock spring and after all of those nasty CCI primers are gone install a lighter mainspring and start using Federal primers. Trust me, once you try a light S&W action with Federals you'll never go back. You do have to have to seat the primers ALL THE WAY in the pockets. Using Federal primers has given me 100% ignition on all of my revolvers for many years, and they are all set up with light springs.
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