Epic Torture Test: 40,000 Rounds and Four AR-15s
Shooters have been debating the cost/benefit of shooting steel-cased/bimetal-jacked ammunition verses traditional (and more expensive) brass cased and copper jacketed ammunition. My good friend Andrew Tuohy has conducted an epic torture test to see how the more expensive brass-cased ammunition compares with cheaper steel-cased ammunition. It turns out that brass cased ammunition is a lot better, more than I thought it was, but over 10,000 even with two barrel changes the steel still works out to be ~15% cheaper. His summery is in the video below, but you should read his entire exhaustive writeup, including barrel cut-away photos.
Read the complete text here.
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Not to pig out, but it'd be nice to see malfunctions included in these graphics too.
the firing with so many mag dumps exacerbates the otherwise slight extra barrel wear from the bimetal.