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Just read an old article about the Daisy V-L caseless bullet. Daisy made them for a couple of years, but apparently quit when the government decided that they did qualify as 'firearms'.
Daisy probably tried to qualify them in the same class as their BB guns.
However, the article was full of speculation about how this concept could revolutionize military weapons. (Less weight and other benes).
I wonder what the fatal flaws were. The powder was made into a solid form and there was no primer. It used a small hole and compressed air to ignite the charge. From what I read, the air got extremely hot and easily fired off the round.
I THINK that Daisy just made a single shot system. The whole concept might have unstable as a repeater ( maybe the chamber would stay too hot).
Reading the title of your thread made me first think of the 1850's (or 60's not exactly sure) Smith and Wesson Volcanic lever action pistol. It too used caseless ammunition except there was in fact a primer and powder inside the bullets hollow base.
My guess is caseless ammo such as the Daisy round would have been too easily contaminated from moisture and such. Although the round could be treated, I'm guessing that that would effect the compressed air's ability to ignite the round.
Novel idea, combines my two favorite things; guns, and compression ignition!
Last thing I recall reading about this involved electronic ignition--that would be a weak point for sure. Maybe on a ship or in a tank where you have an electrical system. But not in a rifle where you would need to change batteries.....
IMO you'd need something with a lot stronger and more reliable spark than that thing. It might light flammable gases, but the caseless cartridge can't be volatile or explosive, as magazine, transport and storage ignitions are not your friend.