Don’t mind me, just duck hunting Stukas
Here we see a Degtyaryov PTRD-41 team practice anti-air gunnery with a single-shot 14.5×114mm antitank gun.
Don’t laugh, it actually worked a couple of times, reportedly.
According to Soviet sources, one Red Army sniper of 82nd Guards Rifle division, Mihail Lysov, shot down a Ju-87 Stuka dive bomber in October 1941, using such a rifle while another Hero sniper of 796th Rifle Division, Vasily Antonov, downed a much larger Ju88 with four rifle shots of a semi-auto Simonov PTRS-41 in July 1942.
The single shot PTRD and 5-round PTRS were popular in the days of thin-walled tanks such as the PzKpfw I which had just 13mm of armor at its thickest point (the 14.5mm round could zip through 40mm of steel at 100 meters), but as tanks got meaner the guns were basically used to snipe trucks and thin-skinned vehicles at ranges out past 1 km.
However, the Soviets used them in their whaling fleet as late as the 1970s
And they still pop up in the Donbass today…