All of mycases are trimmed after the first firing and then discarded after five reloads. iweigh my cases when i am after real accuracy.There is this general belief that military cases are always heavier than .223 commercial cases: This is largelyuntrue. Indeed, some commercial cases are much heavier and, therefore thicker, than any US military case ever made. Watch out for foreign military cases though: Some are very heavy.

http://www.ar15barrels.com/data/223weights.xls