Now I can't remember if this has been gone over before but I usually get my brass from buying some factory stuff and keeping the brass. I mostly have federal brass, I have not had issues with it apart from taking the crimp out of the pockets and some being tighter than others.
A while ago I decided to try Winchester brass, partly because of the primer pockets are not crimped, and it was cheaper.....

Anyway I am not that happy with the brass I have got from the Winnies, I have found the primer pockets are loose it some, it concerns me and I have thrown out some as the primers have practically fallen into place. After just the factory load has been fired!
So I am now wondering if there is a brand that people buy because the brass is good. Not wanting to buy expensive brass as I regularly loose cases while out shooting. But I have only ever tried federal(LC stamped I found good, but was told FC stamped should be avoided) and Winchester. What do others use?