I have found that in 1906, Frankford Arsenal was directed to produce 10,000 rounds each of .45 ammunition, for both pistols and revolvers submitted to the Army pistol trials (both S&W and Colt submitted .45 DA revolvers). Unfortunately, details are lacking regarding exactly what these .45 revolver rounds made by FA looked like. There are rimmed .45 revolver rounds headstamped FA 4 06 known, but whether these are the revolver rounds made by FA for the 1907 trials has not been established, and even if so, are they any different from the .45 S&W/Schofield Government cartridges? They don't appear to be, and at that time there would have been no reason for them to be anything other than the same .45 round that FA had always produced. More to come.