I've been loading wcc,lc and rp brass. Same load,same bullet,same primer. On paper I dont see any difference if I mix the 3. If military brass is thicker,shouldnt the military brass produce higher pressures ? causing more velocity
and possibly shoot higher than the RP brass?
Just wondering if anyone else has found the same thing.

Of the commercial brass, RP is one of the heavier. Ultimatly you need to weight a lot of 10-20 each to get an idea how uniform and how much each lot weighs.

Brass is strange. Sometimes you can change brass, and your groups will shoot in the same hole. Other times, they will move a foot. IME the only way to know is to take it to the range.

I shoot comp-etition with 223. Hardly anyone worries about which brass case of those you listed for out to 300 yards. At the 600 yard line people get more particular with the ammunition components.

For the record that reduce the charge for military brass is for 30=-06 and 308.

The LC 223 brass is usually lighter than Rem, Win or WCC. And none of these choices are different enough to worry about interchanging except for 600 yards and beyond.

quote:

On paper I dont see any difference if I mix the 3.

May take a bolt action benchrest rifle to tell the difference?? Good link > http://www.6mmbr.com/223Rem.html

From Wikipedia ; So we all don't listen too my dribble .


While the 5.56mm NATO and .223 Remington cartridges and chamberings are very similar, they are not identical.

Military cases are generally made from thicker brass than commercial cases; this reduces the powder capacity (an important consideration for handloaders[9]), and the NATO specification allows a higher chamber pressure. NATO EPVAT test barrels made for 5.56mm NATO measure chamber pressure at the case mouth, as opposed to the location used by the United States civil standards organization SAAMI. The piezoelectric sensors or transducers NATO and SAAMI use to conduct the actual pressure measurements also differ. This difference in measurement method accounts for upwards of 137.9 megapascals (20,000 psi) difference in pressure measurements. This means the NATO EPVAT maximum service pressure of 430 megapascals (62,000 psi) for 5.56mm NATO, is reduced by SAAMI to 379.21 megapascals (55,000 psi) for .223 Remington.[10] In contrast to SAAMI, the other main civil standards organization C.I.P. defines the maximum service and proof test pressures of the .223 Remington cartridge equal to the 5.56mm NATO.

The 5.56mm NATO chambering, known as a NATO or mil-spec chamber, has a longer leade, which is the distance between the mouth of the cartridge and the point at which the rifling engages the bullet. The .223 Remington chambering, known as SAAMI chamber, is allowed to have a shorter leade, and is only required to be proof tested to the lower SAAMI chamber pressure. To address these issues, various proprietary chambers exist, such as the Wylde chamber (Rock River Arms)[11] or the ArmaLite chamber, which are designed to handle both 5.56mm NATO and .223 Remington equally well. The dimensions and leade of the .223 Remington minimum C.I.P. chamber also differ from the 5.56mm NATO chamber specification.

Using commercial .223 Remington cartridges in a 5.56mm NATO chambered rifle should work reliably, but generally will not be as accurate as when fired from a .223 Remington chambered gun due to the longer leade.[12] Using 5.56mm NATO mil-spec cartridges (such as the M855) in a .223 Remington chambered rifle can lead to excessive wear and stress on the rifle and even be unsafe, and the SAAMI recommends against the practice.[13][14] Some commercial rifles marked as ".223 Remington" are in fact suited for 5.56mm NATO, such as many commercial AR-15 variants and the Ruger Mini-14, but the manufacturer should always be consulted to verify that this is acceptable before attempting it, and signs of excessive pressure (such as flattening or gas staining of the primers) should be looked for in the initial testing with 5.56mm NATO ammunition.[15]


Military brass is also slightly different in brass composition , Red Brass is harder than Yellow brass ; You can Goggle the differences . Also another reason NOT to shoot 62 grain GREEN TIP Surplus Machinegun ammo out of AR'S or Bolt Rifles !!!.

Wikipedia is nothing but unconfirmed dribble. Some one is refering 30-06 and 308 as far as thicker brass.

The original post was about AR-15 brass, not ammunition.

Real world measurements consistently show LC as lighter than Rem or Win. There is a lot of info over on AR15.com as far as cases go. Let's not cloud the issue with differences in the loaded ammunition.

quote:

Military cases are generally made from thicker brass than commercial cases

That is flat-out wrong regarding .223 or 5.56x45mm.

There isn't a dimes worth of difference between military and most commercial 5.56/223 brass.

My experience shooting 3,000+ rounds/year of .223 for the last 10 years in Service Rifle ARs mirrors this: 223 vs 5.56