I replaced my plastic magazine frame today in my 11VT with a metal one from Savage. This in turn required a new magazine. I was doing a simple function test with a fully loaded mag and noticed the bolt was extremely stiff on close. I discovered it was the ammunition itself. Its PPU .308 FMJ. I've never shot it before. I tried some other brands I have around and it chambered everything else just fine. Anyone here have a similar problem?