If you don't reload, nope. Bad trade. Even if you do, you should get some $$ out of the deal. The guy w/ the 7mm08 would be making out on the deal. Depending on your particular rifle it could be worth what his cost new. Just buy a new barrel in 7x57. The bolt face is the same as 06. Why do you want to trade yours?
Freedom is not free. The best of us always leave too soon.