Search:

if its just the crown then a few inchs might do the trick
there are little gauges that will tell if the bore is worn if you get a local gunsmith to have a quick look
I had my brno counterbored to...

708 is a fine cal but you do have the choice of 308,6.5creed,243,260 and any others that pop up in the time you are looking that are based on the 308 family case

its cost me roughly 100ish for a...