300wm Federal brass head stamps
 

Was looking at my coffee can of 300wm mixed head stamp brass and I noticed the fc brass I have collected has a few different stamps on it I have some stamped fc some stamped fc 10 and some stamped fc 11 there all 300wm does anyone know the difference?

here's a pic

Year maybe? May designate different manufacturer. Some of their brass is from Lake City for sure. It’s decent brass. I definitely prefer the same lot in my old age, but really for hunting and the average shooter as long as it’s one brand and trimmed to length, I feel it’s fine.

I emailed federal the 10 and 11 are the year it was produced.