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While I don't have any actual evidence of this, I don't think any subsonic bullets would destroy small game (maybe with the exception of 900grain+ big bore stuff)
At subsonic velocities, you don't get the hydrostatic shock, which is what gives the .223 it's killing power. You likely wont get much, if any, expansion from a bullet. Subsonic bullets essentially do what most pistol rounds do. They pencil a hole, about the size of the caliber, in the target. (slightly bigger hole, if the bullet expands) Heavier bullets are used in subsonic loads because it carries more momentum to the target and allows the bullet to penetrate as much as possible, because that's the only way you're going to get damage. If the bullet doesn't penetrate, it probably means it hit a bone, stopped, and didn't do much damage.
Terminally, a subsonic .223 will essentially do what a subsonic .22LR does, if you happen to have bullets with better sectional densities than the .22LR, then you'll get a little more penetration, which wont matter, if .22LR can already pass through your intended target. Likely the same damage will be caused, unless the .223 happens to yaw.
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