Undoubtedly, Waterman’s excellent, detailed information correct.
However, please note that “gallery practice” was largely intended for more or less basic marksmanship training using indoor ranges in National Guard armories when access to outdoor ranges was impractical due to distance, weather, or the time required not fitting into the Guard’s weekly/monthly drill schedules. For this purpose, the cheap, easily reloaded at the local level with Army provided tools, .30 caliber round ball gallery practice cartridges were sufficient. Later gallery practice loads with conical lead bullets were better than the round ball, but still not really “match quality.”
At the same time, there was also a very strong movement for competitive marksmanship with many units taking it quite seriously, as Waterman’s details above suggest. For them, more sophisticated and accurate equipment was highly desirable. Since many Guard units at that time were as much social clubs as warfighters, some had the money and willingness to invest in the latest items to achieve improved scores.
There was also competition using “service rifles” with civilian teams competing against others, including military teams, subject to whatever rules were in place at the time.
This was also the time (circa 1908) the the Cummings Sub Target marksmanship training devices entered the market and became widely used by military units (active and reserve) as well as among high schools with sort of JROTC type programs, or just an interest in marksmanship competition. (These required no ammunition or actual range- a plus for the bureaucrats, but a loss for us cartridge collectors).