Experience level: no problem to keep 5 shots 0.25"@ 100, 600 yards 2.8" - 3"
Using bipod and rear bag, shooting of bench, flags yes use them all the time.
Optics remove it from rifle which shoots 0.25".
This gun is not designed to shoot VLD or any 140 grain bullets, the chamber is cut using standard 260 reamer suited for 120 gr hunting bullets, seating 140 gr Bergers will push them way below datum line.

here are 300 yards 5 shots no wind cottony seeds from nearby trees where slowly moving through the air, I would say perfect condition.
[img width=600 height=450]http://img542.imageshack.us/img542/787/p1050336.jpg[/img]

[img width=600 height=450]http://img198.imageshack.us/img198/7976/p1050331f.jpg[/img]

Copper was embedded in the barrel when I shot those groups.

I did some fire lapping using KG-2 and this instructions http://www.cleenboreusa.com/kg/firelapping.asp
I used IMR Trail Boss for fire lapping rounds.

This barrel must be replaced, to shoot long range freebore must be extended also HS stock needs to be skin bedded.

I have Savage 111 model in 270 WIN it shoots 1/2 MOA no problem, and doesn't create copper fouling, so I think you are misled that copper is good for accuracy...
Problem with copper, it changes its state more quickly then steel, so you groups will suffer as soon as barrel warms up from the first shot.