Probably not, mainly because there are so many other factors besides bore condition.
Counterbore? How deep? Is the interior face of the counterbore crisp and clean?
Counterboring effectively changes bore length, thereby changing accuracy load requirements. Decades of storage, partially corrected cleaning rod wear and decrepitude can mess with the face of the counterbore, which is effectively the barrel's crown.
That's just for starters.
Even the 148gr surplus loads are optimized for a full length bore. They shoot rather well in one for surplus.
I don't discredit counterbored barrels, but I think they do change the game somewhat.
No matter whether or not you chop the barrel, load development is probably the best way you'll be able to attain the barrel's true accuracy potential. Do it and you may surprise yourself.
Greg