I have an opportunity to buy about 1000 rounds of 30-06 ammo from the estate of friend. It was resized, swagged, and reloaded with 150 g. ball. It has been stored in a cabinet in a garage since it was reloaded in 2006. The cases are tarnished but not corroded. I would use the ammo in my M1 garand. Is it OK to purchase and fire this ammo? I can buy the cartridges for about $.50 each. Any thoughts? The deceased friend who did the reloading was a long time reloader and shooter--very skilled.