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I am sure that subsonic .223 ammo would be O.K. for target practice when fired in a gun with a silencer-but dropping the rounds velocity down to the subsonic level would definitely adversely affect its "knock down power."
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"Knock down power"?
I'll assume you mean kinetic energy of the projectile ......
Look into 300 Blackout for an AR cartridge capable of subsonic ammo with decent energy on target. It still aint stellar, but it is subsonic.