If the cases are not expanding into the pits, they are not large enough to worry about - in my opinion. You MUST make certain the barrels are scrupulously clean & dry after shooting and well oiled with a water displacing lube, flushing out any residual moisture before final oiling if a final oiling is necessary in your climate.

If living in high humidity area, you may require extra protection for your barrels. Around here, with the average humidity around 50%, WD40 is all that is needed after flushing the barrels with water and drying with patches. You may need a better 'reservative' than we do.

About value change - can't say, don't know.