I picked up a box of 350 rem mag stuff at a gun show today. In it there are several boxes of factory ammo. Some of it is newer yellow and green box stuff, while there are several boxes of the old green and white boxes. There is one box of the old stuff that has the brass colored primers, and there are several other boxes of the old stuff that has silver primers. Was there a time when Remington used silver primers instead of the brass colored ones used today? Is there a way to tell if these are reloads? Thanks for any help.