I have two 280/30 cartridges with the h/s of FN 7MM 52. They are both within 3 grains in weight of each other. The only difference I can see is one has a flat brass primer with light purple primer sealant and the 3 stab primer crimp and the other one has a oval primer and no primer crimp with dark purple primer sealant and. Is this the only difference between these 2 cartridges?
Thank You