If you have enough CLP on your magazines that you can see it, you have too much CLP on your magazines. Wipe the magazines down with a clean cotton cloth so that you can not see the CLP, and they should be fine.
If these are just range magazines, loading them just before shooting should have no effect on the ammo. If they are carry magazines, the CLP could contaminate the primers and/or the powder in fairly short order.
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Guns cause crime like spoons cause Rosie O'Donnell to be fat!
I hunt, therefore I am.