I was given some Herter's 7mm Remington Magnum brass, the ammunition is from the late 60's, the previous owner recently fired the ammunition a few months ago without a problem, he gave me the brass, most of the brass looks in good shape, about 10 rounds have a lot of tarnish, haven't tumbled yet,is this brass safe to reload(hasn't be reloaded yet), or toss in the trash? I've never used brass this old. Thanks for your advise.