I process brass from range pickup for general AR rounds. After prep, I use whichever I grab out of the box and reload it.
I can say that LC is by far the hardest to process of the major brands you see. I use a 45deg bit made for removing the primer crimp and you can feel the difference in LC brass. PMC is the softest I have done prep work on, and FC is nearly always shorter than Spec, but they all run through the AR's without issue.
I have a couple thousand LC, I think they are 2014's set aside that the weights are within a few hundreths and the oal are identical within spec's.... these have been received from different places and they are all the same... good run of brass that time.
