Commercial 12.7x108 blanks

Just for the records.
I wonder who might be the civilian customer for commercial 12.7x108 blanks offered by Novosibirsk Cartridge Plant.
Image taken from the Russian gun magazine “Kalashnikov”.

Movie Gun Suppliers…Many nations (with more Film-Friendly MG Laws) use Dushkas in films. I am chasing 23x115 Blanks for my NS-23 and NR-23 Aircraft guns…

Doc AV
AV Ballistics Film Ordnance Services

i never seen blanks in 23x115
it’s strange because they exist in 23x152 for ZU and ZSU 23

Nothing strange in that as blanks for aircraft guns are useless.