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In this PDF is a diagram without numbers and not to scale, but shows the gas port pressure spec of the AUG rifle compared to the M4 and the ranges do cross, but ammunition is often suited fo one or the other, but not for both.

https://web.archive.org/web/20150801074633/http://www.dtic.mil/ndia/2011smallarms/WednesdayInter12397Evenden.pdf

Then shows F1 ammunition compared to M855 ammunition.

They then developed a special powder to meet the crossover range of the gas port pressures for both the AUG and the M4 and used the powder in their F1A1 ammunition.

Note that they were using a 62 grain penetrator bullet, but was a different shape from NATO specs and the case capacity was smaller than M855 cases.

When they changed the powder, they also switched to NATO spec bullets to match the trajectory of the M4 optics and they increased case capacity to that similar to M855 ammunition.

Australia destroyed their only primer factory in 1999 to make room for the 2000 Olympics and now imports 5.56 and 7.62 primers from CCI in the US and 50 BMG primers from RWS in Germany.

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Way to show your work... I learned something new, thanks...

and Radway Green was the Brit ammo that was under pressured. and had a safety of use message in the early 2000's. To be used for training only.So much for NATO STANAG.
https://i.imgur.com/TbCh9Zn.jpg
Shit did not run well in my Gun at a class.

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I have a cheaper AR upper, but its 4150 CRMOV nitrided barrel with m4 feed ramps and is holding up real with after 1200 rounds so far. (400 steel, 800 brass ish)  I've designed my rifle to make sure it feeds, shoots, and extracts any type of ammo (including steel) reliably. Steel ammo is steel ammo, its going to have failures regardless of the manufacturer, but I wouldnt design a gun around steel case ammo. If you want to shoot 10k rounds of steel just buy an AK, and then you wont really have to worry.

From what I learned is as long as youre not shooting thousands and thousands of rounds of steel consecutively and you clean your gun after every range trip, your barrel will last just as long running any old brass ammo. People will have other opinions on that, but thats from my experience from talking with people who train alot on steel.

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The experiments have been done, the math calculated, the science settled.

Shooting steel case ammunition trashes your components. But the cost of brass over steel ammo outweighs barrel cost.

Conclusion: It's cheaper to shoot steel and replace barrels than shoot brass and get 30-40% more barrel life.

Final thoughts: Though it's cheaper to shoot steel and replace barrels, premium loads are not found in steel cases. Seems like a waste of time and money to build a gun for shooting steel unless you're only purpose is mag dumping into the berm.. but that again strikes me as a waste of time and money so. YMMV

Quoted:

Member @MisterPX had a thread here that says a lot...about cleaning and steel case.


16k of Wolf ammo before issues outweighed the test....


https://www.ar15.com/media/mediaFiles/416992/ppppp_desktop_px_2-tm-tfb_jpg-1902750.JPG

https://www.ar15.com/media/mediaFiles/416992/ppppp_desktop_px_1-tm-tfb_jpg-1902752.JPG


IIRC, the bbl was a Bushy.