I try to keep my brass sorted, but not because I think it affects accuracy. For .45 auto, I have Federal, Winchester, UMC, plus a few odd ones.
Federal brass is the thickest, and won't chamber in my 625 when loaded in moon clips.
UMC is so thin I have bullet setback issues when used in my 1911s.
So my Federal brass is 1911 only, my UMC is 625 only, and the Winchester works in both.
In .38 special, I have federal and UMC. I use mostly the Federal brass, because the UMC is so thin that the case mouths sometimes get bent in a little when seating the bullet, shaving lead. The Federal brass doesn't do this.
Federal brass is the thickest, and won't chamber in my 625 when loaded in moon clips.
UMC is so thin I have bullet setback issues when used in my 1911s.
So my Federal brass is 1911 only, my UMC is 625 only, and the Winchester works in both.
In .38 special, I have federal and UMC. I use mostly the Federal brass, because the UMC is so thin that the case mouths sometimes get bent in a little when seating the bullet, shaving lead. The Federal brass doesn't do this.