If one researches the “Illustrated London News” and other contemporary news sources, Much propaganda use was made of the use of “Explosive” Bullets during the Serbian campaign ( 1914-15). It was intimated that the cartridges were general Infantry Issue, and the Horrendous wounds in Flesh were contrary to the 1866 St.Petersburg accords, and also the 1899 Hague Convention and the 1907 Geneva convention on SAA “fragmentation” munitions.
The Austro-Hingarians retorted that (a) They were Not general Infantry Issue, but used to locate machine gun Positions etc, and were meant to explode on the Shields and revetments of duly protected MG and Artillery Positions and (b) sometimes someone will be wounded or killed by such a bullets, just as soldiers are killed by Shell bursts etc… (Mis) Fortunes of War. The propaganda war continued on both sides( Captured French “Balle M” was also said to be “Dum-Dum” by the Germans, when it was just Flat Point FMJ (for use in Lebel Tubeloaders), and the “de Stand” ammo speaks for itself.
(Balle Sectione’e and Balle Fraise’e)
The “Balloon” justification is a bit early in the war( before 1915) as Balloons and Zeppelins only became a problem from late 1915 onwards; and anyway, it was an Allied development, first in 11mm Gras, etc, and then in rifle calibre cartridges.
Whether the Austrian cartridges should be called “Beobachtungs” or “Ubungs”-Patrone is a moot point…The One term (Observation) the second (Test or Trials) both describe the Function of the cartridge. They were definitely NOT an “Exercier” or “Platz” Patron (For training Purposes); Probably the term “Explosiv Gerat” patrone would have been more appropriate ( check my German Terminology), irrespective of its use. Certainly they were used later in the war as an Anti-Aircraft and Anti-Balloon ammunition, costly as it was to produce them.
A few Points to ponder… “The First Casualty of War is Truth”