I would just send it to get the cylinders honed either to .357 if you will only shoot jacketed or to .358 if you will shoot lead as well. Easier and will get a better result than sending it to S&W. Send it to Doug at Cylinderhone. He will do it to whatever size you want, within reason. He's done nearly a dozen for me.
This^^^^
Very common revolver cylinder situation ( for me more so in Rugers). For cast lead bullet accuracy and reduced leading a slightly oversized bullet (.358). and accommodating cylinder dimensions as compared to bore diameter will allow the bullet to properly obturate. The last thing you want is for your cylinder to swage down your bullet so that it is undersized for the bore.
