different barrel different load...the bore is most likely tighter than the factory barrel...i dont shoot a 338 but IMHO you should back the bullet off to .020-.025 drop the powder charge and work back up...i also had the best luck with CCI 250s in my 300....the 215s always gave me high or erratic ESs...ive also had the best luck with all the bullets ive shot at .015 to .035 off the lands.
Bookmarks