I have been using this product for several years but it became hard to find until I found Miwall.
Aguila Ammunition - 22 Long Rifle - 20 Grain Lead - Super Colibri -Powderless - 500 Rounds W/ Free Ammo Can
These 22 LR do not have Gun Powder, and go off of the primer charge only. THEY WILL NOT CYCLE IN A SEMI-AUTO WEAPON.
The Super Colibrí was made for hunting and target shooting. Ultra-quiet, it offers higher velocity and energy than the standard Colibrí for when that little extra punch is needed. It’s designed for bolt-action or revolver platforms.