Crapped out bores
I've never shot out a 'bore' before. But, here's some possible REASONS why Lugers, and other various guns get bad-bores, thin-rifling, etc:
-Past use of Corrosive ammo
-Used Corrosive ammo, and not cleaned while in a Humid Climate
-Steel jacketed Bullets (Russian, or other surplus)
-Other effects....?
I know if you leave a corrosive shot casing out overnight in a Humid Climate, it'll turn steel around it into instant rust. (or something like that).
Cleaning a bore to death with a brass-brush may affect the bore to a certain degree.
I have a Remington 51 (old gun) autoloader pistol, and it had a smoothed out bore on it. It had also never been 'really cleaned' before. I took a brass-brush to it, and lots of solvent. After about 10 minutes of cleaning, and recleaning the bore, I picked up TONS of black residue. Residue built up over 50 years. After a good-cleaning, the bore was minty again, and the Rifling strong. Oiled up of course too.
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