The current issue of the IAA Journal (Issue 458,Nov-Dec 2007) on page 44, shows a picture of of box of .30 Government (.30-40 Krag) 158 gr. Lead bullet “For Riot Use”
Randy Hedeen is quoted as saying " it as only listed for a few years.
It was first produced in late 1902 and is not listed in the 1902 catalog. I do not have a 1903 catalog, but it is listed in the 1904 catalog. The 1905 catalog shows the load name changed to “.30 U.S. Army, Guard”. The bullet weight is shown as 156 gr. Lead. I am sure this is the same round with a new, more acceptable name. Under this “New” name it is carried in the catalog to at least 1909. I do not have a 1910 catalog, so I do not know if it is still listed there. The 1911-1912 (combined catalog) which is now Remington-UMC no longer lists the Guard load.
So, to sum up the production of this scarce loading, It as called a “Riot Load” only in Fall 1902 to 1904. As a “Guard Load”, it is listed 1905-1909 (most likely until 1910).