There are only a few 'smiths that do re-bore work...Oregunsmith, Reboring by Jess at 35caliber
http://www.35caliber.com/, and a couple of other you need to search for yourself.
Prices run from about $225 to $400 or more in some cases.
The 6.5 Lapua is an interesting cartridge along with the 6mm through 30 cal versions.
Step up to the .473 case size and you have a lot more choices and can still use the Lapua case if you want. I built an stub barrel NEF 6mm BR I like very much that would have been a 6.5 cal if I had a 6.5 cal barrel instead.
To many choices...not enought time OR money....
Hahahahahahahahah
Luck