I just want let you guys know if you are needing your cylinder throats open up a little bit I sent my S&W 657 .41mag to a guy in Denver Co. I told him I wanted them opened up to .411. The total cost was $35.00. with shipping. I tell what guys, he did a perfect job, I checked and rechecked them 3 times and they were spot on. His name is TOM SOKOL, REVOLVER CYLINDER REAMING, 2810 DEXTER ST., DENVER, CO 80207. Ph# 303-618-4329