The K&C cartridges is marked “M 93” so obviously a Romanian contract cartridge (NOT “M95” which would indicate Netherlands)
AS to the Nature of the Projectile, not “Incendiary” but more likely “Observation”. The system was also used in 8x50R (Austrian) cartridges, for striking the shields of MGs and Artillery Pieces, thus giving an Indication of “Fall of Shot” ( Tracers and Incendiaries were only developed in WWI, for Aircraft use against Gas filled Aerostats (Observation Balloons and Zeppelins).
The “explosive” components of the bullet made them come under the Restrictions of the Treaty of St. Petersburg (1868) and more explicitly, the Hague Convention of 1899 ( which expressly forbade the use of Explosive SAA and Expanding SAA ( caused Britain to withdraw its “303 Mark II Special (Dum Dum)” and Mark III,IV, and V — all types of Hollow Point…all developed 1894-1899.) from use in the South African War ( 1899-1902).
Nice collection of early Romanian and Dutch 6,5s.
PS, The USC Co 17 shown as last on the list of Photos, is a 1916 Contract for Romania…but it is not certain that it was ever actually delivered, as Germany Over-ran Romania in 1917. Other Materials ordered by Romania before 1916 (Locomotives etc) were re-directed to Italy, because of Impossibility of Delivery, even by neutral ships via the Bosphorus (Turkey); By the time Romania was invaded in a Manner fore-telling the BlitzKrieg of WW II, the German Troops were carried by Truck into the Main Romanian Garrison towns, the Troops were armed with a pre-ponderance of “Musketen” ( Danish Madsens) and MG 08/15s, besides Rifles.( 1918 German Army Order of Battle) Also The US had become a Belligerant in 1917 as well, so delivery to Romania became even more problematical.
Austria ( K&C, etc. and Steyr) had “sequestered” all contracts for Romania in 1914 (R. was neutral), The Rifles eventually being rebuilt to 8x50R , but in the meantime, existing 6,5x53R ammo was used by the Austrians in sequestered M93 Romanian Rifles…it is unknown if Steyr , in 1914, had any undelivered stocks of M95 Dutch firearms; in any case, no more were delivered during WW I, and Hembrug began both “rebuilding” Long rifles into Carbines, and Making their own Long and Short guns.
Afterthought by Doc AV
I became aware of the “USCCo Romanian contract” over thirty years ago, when Tillinghast Auctions had a complete set of USCCo Tools and Gauges for checking the specs., of manufacture of the 6,5x53R M93 Romanian Cartridge. A rare find indeed at that time…I wonder who has it now?