I personally do not like .44 mag. barrels on Contenders. They hurt my middle finger everytime I shoot one. I much prefer the Encore for the .44 mag., handles the recoil much better. I have 3 Contender frames and 2 Encore frames and no idea how many barrels, but the .357 is the largest I shoot in a Contender. Anything larger goes in an Encore frame.