I just picked up 300 brass for my next build, a 6.5 Remington Mag. Its all twenty years old. 100 once fired, 160 new brass and 48 new primed brass. they all have the original boxes, the Styrofoam and cardboard is degrading and some of the brass is tarnished but looks good. I read somewhere that old brass should be annealed. Does anyone have experience with old brass? How should I prep these cases before loading? I don't think I want to use the old primers although they look fine. How do you deprime live primers? Your expertise would be appreciated.