Size (and decap), then trim. Try using a countersink bit in a cordless drill to remove the crimp -- not sure about 5.56 LC brass but it works great with some and it's *fast*.
All the FC brass that I've picked up was too short by a thousandth or two after sizing . So I separate it out and use it together as a batch because I might have to adjust the dies for it. No need to trim, just check for any long ones.
I haven't shot enough 5.56 yet to know if I should invest in a small-base die.
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