alright there is two brands of ammo and two conditions of the ammo. the brand doesnt seem to matter but the condition does. Half the ammo is like new condition being shinny brass, the other half has turned black on the rear half of the cartridge. The good looking ammo is going bang about 60% of the time but is doing things like not having enough power to cycle the next round. The half black ammo is going bang 100% of the time and funtioning properly as well as being accurate.