Home Forums Reloading Varmint Rifles 223/5.56 brass question

I spent a lot of time weighing .223 brass this summer (COVID boredom); the vast majority was 92 - 94 grains. But there were some anomalies like a few FC (visually indistinguishable from other FC) and some foreign manufacture that were a lot heavier. Being rather OCD, I turned the heavier stuff into .300 BLK and then measured the new necks, some were quite a bit thicker than others, but there was ton rhyme or reason to them. As AS said, different lots and different manufacturers.