Bolt action you have to cycle the action every time you fire, to bring a new cartridge from your magazine into the chamber. Semi-Auto, you simply the rifle once, and then every time you fire a new bullet is automatically ready to go for next time you squeeze the trigger. Fully automatic is much the same, except that you hold the trigger down and it just keeps firing, just like machine guns.
Automatic weapons use the gas discharged after firing to self-load the next round i believe, and they are a little less reliable then a manual loaded firearm.
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