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joneb · August 29, 2012, 12:31 AM

Keeping the velocity below the sound barrier would be a good start. A 173-180gr bullet at a 1000 fps would be somewhere between 38spl and 357mag at about 400 ft/lbs of energy.
I prefer a 45acp or 44spl myself for subsonic shooting.

August 29, 2012, 12:31 AM	#17
joneb Senior Member Join Date: December 10, 2005 Location: Central , OR Posts: 1,888	Keeping the velocity below the sound barrier would be a good start. A 173-180gr bullet at a 1000 fps would be somewhere between 38spl and 357mag at about 400 ft/lbs of energy. I prefer a 45acp or 44spl myself for subsonic shooting.