Since S&W has chambered the L-Frame in .40 S&W, albeit in a Performance Center custom jobbie with Titanium cylinder, and since custom gunsmiths have been re-chambering "L's" to the wildcat .41 Special for a while, I recently asked a pistolsmith of national reputation if he thought it would be feasible to re-chamber a 686 to .40 S&W...he looked at me kinda funny, but...after thinking about it a minute, he allowed as how it just might work...and, NO, I'm NOT tellin' who it was...my idea, I get to go first!!!....mikey357