My box states "Staynless" and that's why I didn't initially question the primers because the early Winchester "Staynless" primers were silver in color. From further research the 30 on the headstamp is not a caliber as I thought but year of manufacture. The only other photo I could find of just a WRA headstamp without the Co. was WRA 31 220 gr full patch with a copper jacket and "Staynless" silver primer made in 1931. The top label of my box confirms this on the bottom right where it reads 8-30 (August 1930).