Ironically, the 1st Contender I ever owned was a 14" .41 MAG. Like a former poster says, it turns a nice handgun into an unweildy hand-rifle... I subsequently purchased two 10" bbls that I like MUCH better. I had a 'smith cut my 14" to 12" and it is much better, I own a number of the 12" barrels with the muzzle tamer on them. I like them ALOT... In fact they're my favorite for a hunting gun... Unfortunately, they were never chambered in .41 Mag.
IIRC, only .223 Rem, 7x30 Waters, .30-30 Win, .35 Rem, .375 Win, .44 Mag, and .45-70 Govt. (Other calibers may have been available from the Custom Shop...)
The very worst recoiling Contender barrel I ever owned, was the 14" .35 Rem...
Not for the faint-of-heart... Trust me!
GH