TX hunter the only time I have seen 7.62x54R fail to fire was from light primer strikes in a Dragunov. It was still packed in cosmoline as well. After the guy cleaned it with carb cleaner, and oiled it all the ammo went bang every time. I agree with picking up a couple of spam cans while they more affordable. The prices have kept creeping up due to its becoming more popular.
No matter how many times you do it and nothing happens it only takes something going wrong one time to kill you.