Originally Posted By: VaHowlerOriginally Posted By: CatShooterOriginally Posted By: HillshooterMy new AR upper will be here this week, Red X 16" fluted bull barrel 5.56. I have never owned this caliber before so here are a few questions.
Can I use the same load data for the 223 as the 5.56
I take it from other posts that loading to mag length will get me the best results
The components that I have on hand are 55gn V-Max, thousands of cci, winchester and remington small rifle primers, lots of varget powder and both 5.56 and 223 brass.
Any help in starting my load workup is appreciated, thanks.
"Can I use the same load data for the 223 as the 5.56"
Yes - they are the same cartridge.
You can use Varget, but it really is too slow for the 55gr bullet - you would do better with one of the faster powders like H4895, 8208, Benchmark, BLC2, H335.
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.223 Rem and 5.56 Nato are not the same cartridge, nor should you use the same load data. Many people believe they are one and the same but it is simply not true.
Primarily the difference is more about chamber dimensions, specifically throat length, and about brass thickness and case capacity. Chamber pressure can become a danger if you go the wrong way because of this. I havent the time to go into much more detail, but google it and you will find very detailed information. Be safe and get all the facts before you proceed. Good luck.
Sorry, but that is purely wrong.
The chamber dimentions vary in ALL rifles. That is why we "work up loads". I have owned a bunch of rifles - marked 223 and marked 5.56... none of them had chambers that were similar to any other one.
Case volume and dimensions are exactly the same - pressures are the same - it is the SAME.
EVERY SINGLE CHAMBER IS DIFFERENT.
.. if they are not, and as you say, "... nor should you use the same load data.", then just where is the loading data that people are supposed to use for the 5.56
I have NEVER seen a separate section for loading data for the 5.56 and MILLIONS of people load for it.
The brass capacity and thickness are the same for the 5.56 case as every day .223 cases.
I really don't know where you get this stuff. This garbage just keeps going around and around and around...