I have an old mauser (Yugoicon M24/47) that I inherited. I was told that it shot well but it doesn't. I have never seen such big groups with a rifle (6-9 inches at 25 yards).

I have cleaned and scrubbed the barrel a dozen times or more but it hasn't helped. The bore looks dark/black and not shiny and smooth. The rifling is visible and crown looks undamaged. Slugging the barrel resulted in .323 to .324 inches in diameter and the rifling was visible in the slug.

I have run modern factory ammo through it and reloads but nothing shoots well in it. I thought the mausers were known for accuracy but apparently not this rifle.

Does it sound the like the barrel is shot out or corroded?
If so, would it be worth rebarreling or should I just hang it on the wall?

The rifle is in okay cosmetic shape but isn't worth much. I don't want to sink any more money into it if it sounds like it is a lost cause.

Thanks in advance for your advice!
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