Fastest bow kill I have had was using a 430gr arrow with a Grim Reaper Whitetail Special (2" diameter 3 blade mechanical). The shot was at 20 yards and complete pass through catching a portion of both front shoulders. The mature doe hit the dirt, then stood up with her back legs and plowed on chest through the grass for 25 yards and died within a few seconds.
I actually caught the arrow hit on my trail cam video. Pretty cool to see, and LOUD.