I have a Savage 99 in Savage 250 cal. When firing, the lever drops a little, and the bolt unlocks and drops a little also. The gun is in excellent condition with some case colors still in the lever, and maybe 80% original blue. Serial is 246xxx. Fired casing of factory Winchester show a flattened primer, with some cratering. Remington ammo shows very little of these, but also causes the bolt to release, and the lever drops. I am thinking excessive head space. What do you think??