Bushmaster Varminter. Never happened before today. Rounds fired and ejected fine, but have weird markings. Looks like a small crescent shape on one side, and a bigger one on the other side. Tula primers which have never been an issue before, but first time using ZMAX 50 grain .223 with 25 grains of H322. All brass fully sized and trimmed to spec. Some of the primers even came out on their own during ejection. Too hot maybe?