Lc 78 nm 30-06

Not sure how rare this one is (if I have it, it can’t be to rare), but I don’t think it’s real common either. (sorry for the poor photo). Headstamp is in a “Y” configuration LC (@11), 78 (@1). NM (@6)

Anyone have any information on these? Why, for who, how many etc.

I am the last person to speak on the subject, but could it be for people who load their own for competition only? I see people at my club’s range loading as they shoot, one at a time, altering the loads according to surrounding conditions.