I am running a 327 m&p R8 currently.
i've got mij cylinder done to accept .38 super reloaded with an undersize die.
I've recently reloaded 9mm brass on the same dies with .38 special bullets (.158 grain) and they ran flawless.
I shoot minor. This years vote on the ga for the new rule is probably going to be 6 Major and 7+minor on loading not shooting.
i shoot ipsc with it in the Netherlands. I think that the 929 needs to much werk when the come from the factory.
So beter an 627 or the 327 then the 929. And the shorter barrel better in balance with the gun.