Calgrammas is good advice, also for sticking, try punching through some waxed paper, or rubbing a little beeswax onto the punch. (Available from anywhere you can get quilting supplis). If you have a good solid type of Beeswax polish you could use that.
One other thing, is the weight of the cardstock. Some punches are really only meant for using with (typically) a copy paper weight - whilst others are intended to cut through thin card.
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