Comments by "Pete Sheppard" (@petesheppard1709) on "Ask Ian: What is Headspace? (And Why It Matters)" video.

  1. Ammunition using steel cases are very common, especially for Soviet/Russian designed weapons. Alloys are used that provide the necessary ductility; to soften steel and strengthen aluminum. Also, steel and aluminum are considered one-use cases, not suitable for reloading, though some have succeeded in reloading steel. You make a good point about steel expansion; while safe to shoot, they don't seal quite as well as brass, so a small amount of residue gets into the chamber, which results in slighty greater fouling which requires more frequent cleaning
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