Schweik deals with the low level fuckups mostly
Plenty of low level examples also. For example whole reason for introduction of Mannlicher 1895 straight-pull rifle was to reach mythical 20rpm (most turn-bolts topped at about 10-12). Which was all fine, except troops were issued with whole 45 rounds (so bit over two minutes of firing). Luckily for logisticians most troops were not even trained to utilize high rates of fire...
Then there was a handgun issue.
Cavalry adapted Roth-Steyr M.07 pistols (really it should be called Roth-Krnka, as both Steyr and FEG were only manufacturers) in 8mm Roth caliber.
Infantry used 1898 Rast-Gasser revolvers in 8mm Gasser
Steyr 1912 was introduced as a war started in 9x23mm Steyr.
Since there was not enough of those guns old Gasser 1870, 1873 and 1877 models were used. Caliber 11mm Gasser
Then there were also officier's Gasser Kropatschek in 9mm Gasser.
And substitute standard, private purchashe, Steyr Pieper 1909 in .32 ACP
And C-96 Mausers in 7.63x25mm
And Mannlicher 1901/1905 in 7.65mm Mannlicher.
Then Hungarians used 7.65mm Frommer Long, dimensionally identical to .32 ACP, but more powerfully loaded, so regular .32 ACP produced stopages in Frommer pistols. Which was (un)fortunate as Frommer pistols were PoS and none liked them.
So 8 calibers (not including whole horde of non authorized pistols) of small arms.
But at least rifles were standardized, right?
Mannlicher 1895, 1890 used 8x50R Mannlicher. Older Mannlicher 1888 used dimensionally same cartridge, but loaded with compressed black powder. Even older 1886 Mannlicher used 11mm Werndl Long cartridge, same one used by Werndl rifles. Fruhwirth gendarmerie carbine (also used in some reserve cavalry units) used 11x36mm caliber, fortunately originally same as 11mm Gasser. Except AH adopted shorter 11mm Gasser loading (11x29 instead of 11x36mm) in 1888 and that shorted cartridge produced problems in Fruhwirth carbines. And there was also 11mm Werndl Long Carbine, that was used by Wernd carbines used by reserve cavalry and artillery units..
Then due the rifle shortages various other rifles were used, in 7x57mm Mauser, 7.92x57mm Mauser (both I and IS version, ofc, not interchangeable), 6.5mm Schonauer and 7.65mm Mauser.\
So about 10 calibers for long arms.
Made Russians look like well standardized.