No aluminum for HK?

There are claims by individuals that aluminum-cased 9mm ammo has narrower extraction grooves than with brass ammo. I have no idea, but---

US-made aluminum ammo in the white/blue box caused the first minor malfunctions in my CZ PO-1.
It either didn't correctly extract, or possibly didn't eject.
 
Aluminum cases have an increased risk of case separation and of erratic ejection over brass. This is due to galling of the aluminum in the chamber over time. The case expands but has a rougher texture to it than brass cases and so resists extraction to a greater degree. They tend to stick more than brass. It also has a tendency to leave bits of itself in the chamber at times.

I've run aluminum cases in some guns without issue but in others problems have developed with extraction. I reserve aluminum cases, mostly, for revolvers.

Most folks, I think, discover this on the range and pick their way through it. Meaning we use what works in our guns and don't use what is problematic. Same with steel cases.

Companies, large and small, employ CYA to varying degrees. That's why Ruger has billboards on the sides of their guns about reading the manual and some others don't.

Here's a link to another thread discussing the issue.

https://forums.brianenos.com/topic/262020-aluminum-cases-require-more-extraction-force/

https://www.ar15.com/forums/ar-15/9mm-Blowback-and-Steel-Aluminum-cased-ammo/15-718139/

tipoc
 
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