I recently acquired some old ammunition in both 257 Roberts and 219 Zipper. The boxes are any where from good to rough condition. Some are handloads and some are factory cartridges. The brands range from "Western Super-X Lubaloy", "Kleanbore Remington UMC Hi-Speed", "Remington Kleanbore Express", "Winchester Superspeed" and a bunch of Random Brass in the aformentioned calibers. There are also some bullets from Sierra and Hornady which the lead tips are corroded. I am estimating that these cartridges were manufactured anywhere from 1940 through 1960. I have the same rifles for which this ammo was shot through.
Would it be safe to shoot the old factory ammunition and reload using the old brass and bullets? What would the value of these cartridges and their boxes be?