here goes:
Civil war era cartridges (paper) used Buck and Ball, or various Minie style bullets. There is something of a precedent.
Some 30 years later smokeless powder comes into being. Velocities increase, various armies start using makeshift soft point bullets. for example, the brits based in India (DumDum) start modifying 303 ammo. Higher velocities and soft point/hollow point and in some cases explosive filled bullets create wounds that are considered inhumane.
Then comes the Hague convention. Among other items, it regulates the use of acceptable bullets in humnae warfare. Bullets must be non-expanding (Metal clad/jacketed) and have a pointed or rounded (BALL) profile. A .45 bullet that is metal clad but has a wadcutter profile (flat) woul dnot be acceptable..
I beleive the requirement for a rounded (or pointed) profile gave birth to the term "ball". Of course "ball" ammo is no longer rounded (but pointed), and while it is non-expanding, it IS most certainly fragmenting (thus violating teh spirit of the Hague convention).
Propellent is completely irrelevant. "Ball" rpunds were in use long before the existance of Ba;ll-type powders. For example, British Ball rounds were using cordite (threadlike strands of propellant) well before the development of ball powders some 40 years later.