I've run 124gr HP (Freedom Munitions @1060 fps) Underwood Extreme Defense @1470fps, through my SBR'd EVO with a Gemtech can. They obviously aren't Sub sonic but they were accurate as all get out. I have run Freedom "HUSH" ammo (range ammo) 147 gr @870fps & they were VERY quiet, but I found them to be less accurate. 3" groups at 75ft as apposed to 1.25" groups for the Defense ammo. My normal 147grn fmj round nose were more accurate than the "HUSH" as well.
George