Mine would have to be this Mod. 657 re-chambered and ported by Gary Reeder to 41 GNR .

Kinda a strange story behind it too , when i first got this gun it came with a box of Rem. 41 Mag ammo with 6 missing , picked it up for $250 ammo and all . Took it out and fired 6 more rounds , the brass was split from top to bottom . My first thoughts were GREAT i just bought a junk revolver .
Called S&W about it , they said send it back and they would check it , well i took it to my local smith first to see what he thought , turns out he says its a Reeder .

What the ---- is a Reeder , so he explains . to finish up , I called Gary , he sold me a set of dies and sent me the reloading data for it . now i just love this thing .

stimpy