I trim my brass before I ever load it even once. Then, I use a modest load that is very accurate for my gun. So far, I have shot some of them about 5 times or so. They have actually shrunk a little in length and show no signs of wearing out. I shoot a wylde chamber. Maybe that has something to do with it. I don't know, but my m1a and garand don't do that well.
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