Ive had a couple of issues with the "red plastic" type, specifically, in a couple of .308's. Never had any issues with the A Zooms.
I use them when I dry fire as well, with pretty much everything. I figure they cant hurt, and they also offer another level of safety, as you cant have a live round in the chamber, if you consciously load the snap cap.
In 50+ years of shooting, Ive only ever broke one firing pin. It was in an M1A, that was heavily shot and dry fired without a snap cap.
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