The short answer is no, brass for 223 and 5.56 are not the same.
Brass for 223 is typically softer than brass for 5.56, meaning that it can be more easily formed into casings.
In addition, the chamber pressure for 223 is lower than for 5.56, so the brass needs to be able to withstand higher pressures to work properly in a 5.56 rifle.
The thickness of the walls of casings for 223 tends to be slightly thinner than those for 5.56, which also affects how well they can withstand pressure over time.
There are slight differences in the brass used for 223 and 5.56 rounds, but they are generally considered to be interchangeable. The primary difference is that certain manufacturers produce brass specifically for 223 rounds which is a bit thicker and stronger than the brass used for 5.56 rounds.
However, most shooters find that either type of brass will work just fine in their guns.
223 brass and 5.56 brass are the same. They are both made of brass alloyed with copper and zinc.
The main difference is that 5.56 has a higher pressure rating than 223, so it can handle more shots before needing to be reloaded.
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