I didn't know they made them in .22. A number of years ago one of the gun manufactures came up with an idea for a caseless round. I don't remember the man. or the caliber but the one I read about was for a bolt action rifle. I'm not sure if it took a special gun or could be fired in any bolt action, it was a slug mounted to a special powder composit. Once fired there was nothing to eject. As memory serves me it never cought on.
If memory serves, this ammo features a cellulose (thereby combustible) 'casing' that was electrically ignited, and required a special firearm. I do not think that this ammo could be used in any rifle but those specifically chambered for it.
I think the Daisy caseless .22 was a "compression ignition" round. The rifle had a piston (much like in daisy air guns) which was released by the trigger. The released piston compressed air in a chamber that was vented through a pin hole into the rear of the caseless round. This compressed air (super heated!) fired the round.
Not to good for target grade weapons as the piston movement was like the bolt going home in a slam fire weapon....but these were play guns/plinkers and a commercial failure.
A kid in High School got a Daisy VL for Christmas as his first rifle. We tried it out along the river one afternoon. It wasn't all that accurate. After trying out my old Browning T-Bolt, he lost interest with the VL & eventually got a Ruger 10/22.