A gentleman on another site has posted and confirmed that he has seen WWII TW production of 8x57 ammunition, with T W 4 4 headstamps, and that Twin Cities produced .303, 7.7x58, and 6.5x50SR during the war, without headstamps, using unidentifiable primers, for clandestine issue and distribution. His source for all this info was a neighbor described thusly: “He started work at TW in 1943 when he graduated trade school as a millwright. Deferred from draft for vital defense industry work. After the war, he worked for Honeywell for awhile, then Federal Cartridge the remainder of his career, working his way to managing the metallic cartridge division. Retired in the mid '80’s.”
I think it is 110% bunk, but before I get involved any more I would like to hear if there is even the barest shred of anything valid here.