Picked up a batch of 45 ACP brass recently. Mixed range brass, tagged as large primer, but I spotted a small primer here and there, no biggie. I am seeing some AMERC brass now, have never loaded any of this before. I have never felt the need for my shooting purposes to separate brass by makers, but while processing (I run them through my progressive (sizing, depriming, and flaring only) I notice the AMERC brass always has a bulge in it. I use an RCBC flaring die, which has the stem that leads the flared edge into the case. The stem measures .448 up to the flare. I also noticed the AMERC brass mics almost double the thickness of any of the other mixed brass. Most others measure .011, but AMERC mics .017 to almost .020.
I do have one of those universal flaring tools that would do the flare without bulging the case, but I assume the stem is opening the case mouth a bit to allow insertion of boolit. Those using the LEE powder through expander die don't have this deeper case mouth expansion feature of the RCBS.
I'll prolly sit down in my man chair and separate some night, but also feel since when I load, I have the LEE FCD in the last station, this will clear it all up, so I should just not worry about it. What do others on the board think of this brass?
I'll end up with only a handful of small primer brass, but of the 2000 mixed, there seems to be maybe 5% or less AMERC.