Brand new Savage 10, .223. I have used CCI BR4's, CCI 450, Fed 205, and Rem 7 1/2 with various loads, trying to get this new gun to shoot. All of those primers have had some that did not ignite. When they do go off, there is a nice crater in the center. When they don't go off there is no sign of a firing pin strike. Happens about 10% of the time. Sometimes, if I return the same cartridge to the chamber it will go off. Other times, it will not. This has me baffeled. Any thoughts appreciated.