If you use normal ammo, you wont wear out any .22 matchrifle any time soon
2 bullets in the barrel, a bulge...wouldnt worry about that either, as matchrifles are singleshot, and you 'cant' reload .22LR. Havent heard of 1 single problem like that.
Even if it wás a clubrifle, it'll still be accurate and outshoot you. As I said, those things dont wear out easily! I have 2 Anschutz rifles(1808, 2002), 1 walther(kk100).
If the stock has many damages, that cán be a sign of an ex-clubgun.
You can feel the bolt for wear (in closed position). You can also look for signs of wear on the shiny bolt surface itself.
If you REALLY want to know? There áre 'calibers'for .22LR, go and no-go's. But I cant recall anyone ever being able to close the no-go.(=worn)
Check for pistolgrip stock cracks.
They dó wear significantly faster with high velo ammo.
You can spot rust if you clean the barrel out with a feltpad (brown). But wouldnt expect much rust though, as they're matchguns, not hunters used in open rain.

But besides the obvious? Dont worry too much about buying a .22..