One thing we've all forgotten to ask is what brand of brass was the split case?
I've had brand new brass split axially in the middle, not good, but not all that uncommon either. I just toss 'em and forget 'em. I've had splits from both Remington and Hornady brass. Don't believe I've had any from Win, Fed or Starline.
It's the splits like SL1 mentioned where you have to start looking at things like head spacing, especially with rifle loads.
Oh, and 3 ft is much too close for your skyscreens. I would suggest a minimum of 5 ft., and 10 is even better. 10 ft is the minimum for rifle loads. Your 3 ft. distance tends to make me think the gas-blast-triggering-both-sensors theory is what did happen.
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