Chamber loading is where you drop or push a cartridge into the chamber and then release the slide. Most people probably do this to avoid having to chamber a round from a full magazine, then remove the magazine and load a new round into the magazine to top it off--in other words, due to laziness.
It is not an issue on some semi-auto pistols, but most semi-auto pistols--including all those using a Browning type action--use a controlled feed design: it is designed so the as the cartridge is pushed off the top of the magazine by the slide and into the chamber, the rear of the cartridge moves from a slanted angle to a horizontal position, and the rim slides in behind the extractor claw. Letting the slide slam onto a cartridge already in the chamber means that the extractor is forced over the rim which can cause wear and tear or even break the extractor.
VIDEO: "How Chamber Loading Hurts Your Handgun"
Paul W. (4 min.)
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