You are confused, it's Ok,
Your trouble is comparing barrel size, caliber and stock options.
Each are specific, some are related.
We need to define them. And you need to help us with what your options are?
Aftermarket barrels for all T/C models have been/where available for many years and in many size/caliber.
Do you seek information specific to T/C options alone or to include after market?
1" aftermarket barrels to fit T/C stocks with a 1" channel were available from .32 cal up too 12ga.
T/C Hawken had both 15/16 and 1" channels, The Renegade frame was available with 1" octagon and round.
So, Please, help us and define your quest,,