With the huge 80-gr bullets I havd wondered what it would take to get a 221 fireball or perhaps something smaller like a 22 Hornet to shoot subsonic. It would require a custom chamber but a Bolt gun with a proper chamber and an 80-gr or the heviest bullet we can get out of 1:7 twist barrel should do the job.
The problem is the terminal energy would not be all that impressive and a subsonic 9mm would work better... I personally think that it would only be useful as a technical challange and if I was to spend that much money on a challange I would work on something more useful.
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