Take the one with the longest COAL and make sure it chambers in your 300blk. Shoot half a box, this will naturally check function, but then pick up the brass and look for split case necks or any other deformities. All that will be putting an enormous amount of effort into shoot some factory ammo. But if you are concerned that's what you can do to ease your mind.
“Twenty years from now you will be more disappointed by the things you didn’t do than by the ones you did do. So throw off the bowlines, sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover.”
- Mark Twain
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