The Sportsman’s Shop, PA Gun Dealer, Used Guns in PA

.223 vs. 5.56 mm Ammo – a Comparison

many firearms novices, and even seasoned shooters, are diffident of the deviation between .223 and 5.56 millimeter ammunition. Many incorrectly assume that they are interchangeable, but they are, in fact, not interchangeable.
here are a good a few of the similarities and differences between .223 and 5.56 millimeter ammunition angstrom well as a little history on these two types of bullets .
History
The 5.56 x 45 millimeter round first came about during the late 1950s as an experimental cartridge for the U.S. Military M-16 rifle. This “ small quality, high speed ” round was desirable because it helped overcome weight and command issues present in the 7.62 x 51 millimeter round that was used in the previous-generation M-14 plunder.

After the official adoption of the 5.56 x 45 millimeter round as the NATO standard in 1963, Remington introduced a .223 quality “ civilian ” adaptation of the attack shortly thereafter in 1964 .
A identical democratic frolic plunder for today ’ randomness enthusiasts is the AR-15. This firearm is normally chambered for 5.56 mm ammunition because it is a descendant of the M-16 rifle .
Case Size
The out dimensions of the administration case for the 5.56 x 45 millimeter and the .223 are the like. however, there are many early factors that determine what is a safe orotund to chamber in a particular firearm, and although the case size is identical on these two rounds they are not interchangeable.
Chamber
The 5.56 millimeter chamber has a longer distance between the mouth of the magazine and the orient at which the plunder engages the fastball. The .223 Remington chamber has a shorter distance before the rifle engages the fastball. This means that the imperativeness within the chamber that is produced when fuel can be dramatically different for these two rounds.

Pressure
Due to the differences in the chamber described above, a .223 round fired through a 5.56 millimeter chamber will result in lower atmospheric pressure than what is safe for the firearm and is therefore typically safe. however, a 5.56 millimeter turn fired through a .223 bedroom will result in higher pressure than what is safe for the firearm and thus is not considered safe. This over-pressuring of the chamber can lead to all sorts of dangerous malfunctions and should be avoided at all costs .
Bottom Line?
It is safe to fire a .223 round from most 5.56 mm firearms, but it is not safe to fire 5.56 mm rounds from a .223 firearm. Because these two rounds look very similar and have the same size case, always check the head stamping on your ammunition before loading your firearm just to be safe.
Which is Best For You?
There are all sorts of considerations that go into deciding what bore of firearm to purchase. Your shooting expressive style, what type of shooting you prefer and many other variables will impact the decision about which quality is right for you.

Please stop by the shop and old world chat with one of our friendly team members if you have questions. We stock all types of ammunition, including .223 and 5.56 millimeter in bulge packs and smaller boxes of 20 rounds a well. Our team looks ahead to touch you and chatting with you about what caliber cycle and type of firearm will be the best fit !

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