f 20 factory new Winchester in 270 Winchester unprimed brass rifle shell cases, packaged in vintage W-W cartridge box
Brass case mouths MAY not be perfectly round from the manufacturing process, this can be corrected by running brass through the size die (always recommended) prior to loading. Residue from the annealing process may leave a stain on the case neck that can be removed by tumbling. Annealing involves rapid heating then cooling to impart the shell cases with the proper hardness to securely hold bullets in place and provides flexibility to expand and contract through multiple firings handloaders expect.
History: When introduced by Winchester in 1925 the .277 diameter bullet was totally new to the shooting public. The 270 Winchester was first offered in the Model 54 and since then has become a classic American cartridge. Jack O’Connor from Outdoor Life was a early champion of the 270 Winchester, he favored the flat shooting 130 grain bullet. Today the 270 is a favorite cartridge to reload, per Lyman the 270 Winchester rifle die sets sales is among their companies top three.