I noticed today on MidwayUSA that Winchester is now selling 230gr FMJ .45 auto ammo in 50rd boxes which are styled after military type packaging. The M-number doesn’t make sense for ammo, and just refers to the Colt 1911. I wonder if this is the same headstamp, or same exact thing as their 230gr FMJ “WIN1911” packed ammo? It would be a nice touch if they made up some sort of neat military-style headstamp for it, but my guess is no. The index number is SG45W which refers to “Service Grade” as Winchester labels it.
Not sure if this is the 50rd box, or the big box for the 500rd pack with 10 50rd boxes: