Literally for 5.56 NATO 48 lbs. of powder would load 13,280 rounds if you didn't spill any and used a 25.3 gr. charge. Winchester 844 as an example with the 62 gr. SS109 bullet and that powder charge gives you your own M855 ball load.
I myself have 8K in 5.56 cases, fully half of which are not loaded yet. I seem to load 3 or 4 hundred then go shoot them so I never get ahead.
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