Others have explained things pretty well, but one last point: it’s extremely rare to have a huge box of unfired cartridges that are randomly oriented. Factory packaging for ammunition is designed to hold the rounds in a specific orientation. There are various ways to do this, such holding them in a pegboard-like plastic or cardboard tray, or having smaller inner boxes of 10 or so rounds. For military use the cartridges may be held in stripper clips, magazines, or belts which keep them confined and oriented in the same direction as well as being ready for immediate use. Which ever way it is done, the packaging is designed so that the bullet tips cannot impinge on the primers of other rounds in the larger boxes.
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