Never had a live primer go pop
and I *have* double-stroked the 550 more than once.
I just sit high enough to see inside the case mouth whenever the loading density is low enough to not spill powder with a double charge. And I look at every case mouth before plugging in a bullet.
Heck, I look at every round anyway. Differences in powder level from the norm get immediately inspected & weighed. The only time I've had a no-powder in a progressive was the *first time*, using a Lee Pro 1000 that I was unfamiliar with.
I find that the rhythm of all the operations, including the sounds and the feel on the op handle, keeps me from having any malfs with the Dillon. I even peek through a tiny gap in the machine and look for a primer in the seater cup as it returns to its spot under the shell plate.
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