It should be noted that 5.56 NATO is also known as 5.56 x 45 mm. The 5.56×45 comprises of several cartridges making a general family. The family members of these cartridges contain similar case dimensions. Studies show that there are only a few cartridges that have been selected to participate in NATO.
5.56×45 NATO cartridges, when it is in its standard form, generates SS109 green tip (penetrator) is within the sixty-two-grain projectile that is bimetallic and contains lead core at its core and also steel core at its tip. The United States of America Army usually use the M855 during its operations.
Various big 5.56×45 ammo for sale cartridges contain several weights and types of projectile. They are hardly used by NATO, and the truth is that it is also rare for all types of 5.56×45 cartridges to use the NATO moniker. For instance, the M1193 cartridge that was developed and used by the US Army has fifty-five projectile of grain. It contains the weight of the original projectile, and it generated sixteen rifles.
Nonetheless, this cartridge was rejected by NATO. The reason for rejection was that it used to tend to produce inhumane fragmentation when in use. Other cartridges that were adapted by NATO include MK262 that generates seventy seven-grain projectiles.
You need to know that the outer dimensions of both the 5.56 and 5.56×45 cartridges are, at times, identical.
The chamber measurements for the 5.56 and 5.56×45 are uniquely different. This was attributed to the need for NATO and the US Army to make sure that they use rounds of tracer that need a thicker and longer projectile.
Research, studies, and dimensions prove that the 5.56 cartridge chamber barrel contains a lead that is short together with a very steep angle. The 5.56×45 cartridge, on the other hand, has an overall volume.