John,
Use the search function for threads on Thompson center contenders, there are quite a few good bits of info here on them.
Try this one:
http://www.thefiringline.com/forums/...ghlight=encore
There are a ton of good calibers that you can get the contender in, either from the tc factory, bullberry, e arthur brown, ssk....
They are addicting. A person can't have just one barrel for a TC...