Won’t eject - Nosler .28 Nosler Partition 160 grain Brass Cased Rifle Ammunition

Bought 2 boxes from optics and had a few problems with about 10 of the 40 bullets not wanting to eject after firing didn’t group well either.The rifle was new and was performing the break in at the time I’ll try a different brand but to have a problem with some and not all the bullets leads me to believe that the quality of brass is not being checked