Today while trying to make an HK 21-E function and experiencing feeding problems. These 3 HS were used. There was a significant velocity and pressure difference between the case’s with the green annulus and the red primer annulus. The green (brass colored primer) were much higher pressure than the red. The red was linked in disintegrating links and the green in fixed links. By looking at the HS can it be determined if the loadings were supposed to be significantly different. This gun did not like the cartridges with the red sealant. Barely ejected them if it fed at all. I hope the scan is clear enough.
Can you tell me who made these? FMJ ball projectile.