Rimfire ammo is much cheaper to manufacture. A rimless centerfire 22 with about the same power as standard 22 LR ammo would certainly be possible. But the cost would be about the same as 223 ammo.
Instead of paying $15-$20 for 500 rounds you will be paying $8-$10 for 20 rounds. Possibly more. I don't see much of a market.
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