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It is difficult to double charge on the 550. The biggest clue would be when seating the primer. The level goes forward to seat it. If there was already a primer in there, you won't be able to push forward. You should then realize that you may have just double-charged.
Before you pull the level you should simply check that there is an unseated bullet in station 3 and unprimed or no brass in station 1.
On smaller calibers, you can just look inside the brass. On a 9mm I'd be near overflowing with a double charge.
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