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Calling BS. Pics Or It Didn't Happen
(lemmy.dbzer0.com)
People tweeting stuff. We allow tweets from anyone.
RULES:
The cartridge casing exists to form a seal against the breach end of the barrel. It doesn’t go anywhere. It just expands slightly from the high pressure gases inside, preventing those gases from escaping out the back, propelling the bullet forward with as much pressure as possible.