Shot out barrel, It would depend on how many shots were fired through the gun. If thousands after 35 years of rat shooting, yes it could be. If used for Deer hunting where 100's I doubt it. My question would be, How many rounds Have been shot in the 35 years and what cleaning methods do you use and how often. I have a Ruger M77 tang in 243. Bought it about 25 years ago. Ruger it has been claimed, bought there barrels from outside vendors back then, causing mixed quality issues. My barrel shoots VEEeerrrry accuratley until it reaches a point where it drops off. A good scrubbing with shooters choice to get out powder fouling/residue, then J.B. bore cleaner for the copper fouling, (patch wrapped very, let me say that again VERY) tightly around a worn out bronze brush, a 100 strokes for and aft is not out of the question. I then check a with a patch of Sweets, if it comes out blue I work it until clean. I've had Friends whom are not that well versed in the cleaning of firearms, (but love to shoot&shoot&shoot) complain that there rifle is shot out, until I clean it for them and its back to normal. (or maybe they just don't like cleaning guns and found an idiot who will). Crash87