I had 2500 or so, AA !2 ga, which I have been loading for probably 20 years. I just keep shooting them until they no longer have a good crimp. Primers always seem to seat ok. Sometimes when the get pretty fried, I will pitch them..
The really rough looking ones, I keep seperate, and I let the kids shoot them up. They are not too good about bringing back the emptys sometimes.
I finally bought another 2000 once fired AA's and I really don't know when I'll need them. I keep saying when I throw all these others away, but who knows when that will be!
One thing for sure, it's not like the old days, when you had to look in the bottom of the paper casings and see if there was still a cardboard base down there.
In the 20 ga, I use the AA casings, but they just don't load the same. One of the group members said good things about the Remingtons, but I don't shoot that many of them.
Regards
Bestboss