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For rifle cases, I check length and trim if needed every time. I only deburr and chamfer if case is trimmed. I also check headspace dimension of re-sized cases either with Hornady gauge or Wilson drop-in gauge. Typically check COAL for each completed cartridge, either with calipers or Hornady bullet comparator. I also check primer depth by feel for every single case and measure some too. AR-15s and M1As both have floating firing pins, so slam fires are a danger.
For any new cases, pistol or rifle, I deburr the primer flash hole. Out of any 100 cases, there seem to be at least 3 or 4 that are really tight or mis-shaped.
Now that I have a digital scale, I like to weigh every cartridge before boxing just to triple check for over/under weight by a powder charge. Especially if I used the progressive press.
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