A friend of my dad offered to load some rounds for my 7Rmag, when i gave him the cases he told me that the primers were all flat. this is a sign of pressure? what are the others? i have been told about a hard to lift bolt but i cycle my round quite hard and would not notice a problem unless it was really bad. the rounds were fedral factory i have put just under 300 through the rifle would this have caused any damage?