Those will tend to pierce much easier than those with brass or copper based striking surfaces (because the steel ones don't stretch when hit with the firing pin like the brass or copper based primers will). In my experience, I've had pitted firing pins from shooting ammo with primers with ferrous (steel) striking surfaces either the ones I used in reloading or factory shells with those types of primers. Has your friend ever shot shells that have primers with steel striking surfaces? Or use primers with steel striking surfaces in his reloads? The 725 may be piercing those types of primers only occasionally, but I've found that it doesn't take many to pit a firing pin tip. In looking at recent spent shells for evidence of pierced primers, you may not see any at that particular time.
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