I look in every trash bin on any range I visit and found only ONE 40 S&W case in all the years here.
have found more 38 S&W cases because there is a guy with a webley revolver visiting the range from time to time.
9mm and 38Sp/357 mag dominate all!
sometimes 32 S&W long what is a serious target shooter cartridge, sometimes 9 mm Makarov( because a lot of them were sold very cheap after the end of the cold war) and 44 mag. 45 acp is also very, very rare.
have only the walter ppk with 1000 geco cases for reloading so fear I am not a real support for the ammo industry when making 7,65 Br/32 ACP.
in my eyes still the best cartridge in a pocket pistol, would not go for the 380 acp.