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Some of the "low number" '03 had too high of temp during the heat treatment, this made them brittle and reportedly unsafe to fire. No way to know if a certain rifle was over heated. You may be able to have a machine shop do a Rockwell hardness test.
This unsafe to fire '03 was pretty much unheard of until CMP outlawed them at matches. It has been exaggerated by the internet IMHO. I understand why CMP took this stand. They can not exposes themselves to the possible litigation from a injury or death.
Lot's of folks shoot low number '03's and a lot don't.
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