A few corrections are in order:
>The Secretary of War adopted the Schofield Smith & Wesson on July 3, 1874, and did not "drop" it until 1898.
> Individuals and units do not dictate policy to the Army.
>The Frankford Arsenal stopped making .45 Colt service cartridges in August of 1874, one month after the Schofield was adopted.
>The Frankford Arsenal began producing Schofield cartridges starting in 1875.