PSE,
The bore of the Bushy Varminter barrels is pretty rough as compared to a Krieger barrel. But don't get me wrong, my Varminter shoots extremely well out to 600yds. I used the same breakin for the Bushy as I did for the Krieger. Rather than describe it here, just go to the Krieger website below. Bushy barrel took about 60 rounds to break in. Krieger barrel shot well from the start.
http://www.kriegerbarrels.com/RapidCat/catalog/pagetemplate.cfm?template=/RapidCat/common/viewPage.cfm&PageId=2558&CompanyId=1246
HTH & have fun!
Carey
Edit: I used Winchester White Box(WWB) for breakin. It is not very accurate, but it burns pretty clean so breakin is easier. The 1X9 Varminter barrel does very well with bullets up to and including 69 gr. Mine shot 69 gr. Sierra HPs best, but 55 gr. Nosler BTs were a very close second. Remember to care for the Varminter barrel properly as it is not chrome lined.