There is always a lot of controversy about the videos and content from my courses. It's not intentional, nor am I offended if people politely disagree.
Marking the cam pin has less to do with saving the life of the cam pin and more to do with extending the life of the bolt.
The more you do to minimize wear and slop between the bolt and cam pin, the longer the bolt should last.
When you allow excessive amounts of slop between the cam pin and the bolt, you increase the chance of stretching or breaking the thin webbing at the edges of the cam pin bore.
I have done extensive testing using custom ground gage pins to track when wear becomes a concern. Some people have a philosophy where they shoot until something breaks or fails. I like to know before something breaks or fails so I can avoid a catastrophic malfunction.
FWIW, I mark my cam pins with a starter drill bit.
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