The .250-3000 round, designed in 1915, was produced by 'Savage' company. Here we have the designer and manufacturer have no problems with US Army using it, as long as they have a sizable contract for supply. I'm not suggesting this cartridge as be-all end-all, just picking up something available in the period the self-loading rifle was being designed for the Army. Nor I'm suggesting that ww2 will end in Allied victory by 1943. After the lenghty intro: - what weight and length we can expect for the ALT M1? - scale of issue? - possible spin-offs before 1945? - earliest automatic weapon with this round? - M1 Carbine is still developed? - what might be reasonable/feasible answers by Germany, Japan, Italy, UK, USSR once they get good data on the rifle, and/or acquire the examples of it? - post war development & spin-offs of both infantry firearms and cartridges? The .250-3000 does not to have fire at actual 3000 fps, I'm okay with a bit lower MV when heavier bullet is used.