Originally Posted By Tmain:
Can anyone recommend the best subsonic ammo to use?
The .223 round relies very heavily on velocity in order to generate effective amounts of tissue damage. At subsonic speeds, .223 bullets are not only not capable of making wounds larger than the bullet diameter, and fairly shallow, but will generally cause LESS tissue damage than a .22LR round, because the .223's jacket prevents any expansion.
Then, consider that subsonic .223 is VERY expensive, while .22LR is very inexpensive. It's hard to find a good reason for .223 subsonic.
A better option would be something like .300 Whisper, which gives you a lot more bullet mass to play with.