The powder [Unique] bridged in the die and dropped a light charge with a low impact. The next charge jostled the press enough that all grains in the die entered the case. Not the fault of the measure just showing that nothing is foolproof.
Got it, like I said I'll just remove the case after each charge and peek inside then put it back and proceed to seat the bullet, only takes an extra second or two. I use Win 231, 4.5 grains, definitely wouldn't want to double charge.
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