Trying to incease energy by using a heavier bullet in a subsonic is a waste of time. Subsonics penetrate to such a huge degree that even lightweight bullets will overpenetrate any soft target. Adding weight just increases the amount of energy that flies out the back side of the target.
I terminal tested 150gr subsonics and found that they blew through more than 16" of wet phonebook, through the bottom of the bucket and disappeared into the dirt deep enough that I could never recover one.
If a 150gr bullet can do that, what improvement would a 220gr offer over a 200 gr bullet?
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