Aqbill.................. Listen carefully. Don't believe anything you've read about NOT having to clean a rifle soon after shooting it. It is a load of bolloc..........., er........., what's the word I'm looking for here chaps? Ah, yes..... horse manure
You need to go to the length of cleaning ANY weapon after shooting it, regardless of the primer mix and/or the propellant or what anyone else has told you. Best bit of advice ever given out by old and experienced Armourers to up and coming learner Armourers is this. TREAT ALL AMMUNITION AS BOTH ERROSIVE AND CORROSIVE. If you do, then you just can't go wrong