My Savage 10 did well with the factory barrel. I wasn't really interested in how well it shot as I was going for a rebarrel from the start but groups were good and mine also liked the heavier bullets. I shot some 150's and 165's, 180's and the groups on the heavier rounds were tighter. Mine was never a tack driver that I know of, as I said, I wasn't measuring groups but 1 moa did show up a few times. Might have been better if I cared but was throwing lead downrange to get the scope set up, abuse the barrel and didn't really care because the new barrel was sitting in the safe just begging to be put on.