The test fire went pretty well. I fired 100 rounds of Winchester White Box through it and never got any doubling; before, I'd had one about every magazine.
I only brought the military magazine with me today, since it had performed so well before. However, this time I did get quite a few nose-up jams--almost one every magazine full, accompanied by a few failures of the bolt to lock back. It was annoying. I'm betting it was the magazine, but I don't know yet the relationships involved that lead to this malfunction. Oddly, this happened more with slow-fire. Rapid fire emptying of the magazine was trouble-free.
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