"Need" is a word that doesn't quite work for me with shooting stuff, particularly T/C barrels!
In the Contenders, I've got a .222 , a 30/30, and a .358 JDJ in 14", and a 7mm TCU which is a 13" after removing an aftermarket brake. There is some overlap with the 30/30 and the 7mm TCU, but both shoot great and I've already invested in dies, brass, etc.
I also have one Contender carbine barrel, a .223, which also shoots great and makes up a very handy, light, accurate rifle.