Remington handgun brass cases have generally seemed to be thin at the mouth to me. I especially had issues with jacketed bullets, so I started segregating Remington cases for use with cast bullets only. I continue this practice today. I've heard that Remington generally buys brass from other manufacturers, and this is reinforced to me by the wide variance of case headstamp fonts & headstamp layouts. Federal seems to be good for this, but 9mm Remington brass for example really shows a lot of headstamp variations. A lot of the cases I've seen lately appear to be either Aguila or perhaps S&B. My 44 mag brass all seems pretty uniform, but 45 ACP brass has really required a tighter taper crimp with jacketed bullets at times too,