what is the differnts between these and a standard t/c barrels

Bergara barrels are made in Spain by Bergara. I don't have a TC barrel, but I have a 7mm-08 and 300 Win Mag for my CVA Optima Elite, they're both excellent barrels, just as nice as my Encore barrel, inside and out.

http://www.bergarabarrels.com/index.html

http://www.bergarabarrels.com/products.html