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There's a tremendous amount of corrosive primed surplus 7.62x54r in spam cans to be found on the cheap. After shooting such ammo it is important to flush the moisture-attracting salts from the barrel to prevent rust build-up and eventual pitting of the bore.
The time tested method used since civil war times is to run boiling water down the barrel to clear it out, send any cleaning solvent soaked patches down the bore, dry patches run down it and then oiled patches run down it. Works like a charm.
Alternatively you may use any cleaning solvent that is marked as a black powder solvent such as Hoppe's #9 (A popular black powder solvent that works very well). Personally I use 1 part Balistol 9 parts water to clean my nuggets, but have used Hoppe's prior to great effect. Just remember to oil the bore before storage and you're set for corrosive ammo.
Safe shooting and have fun!