just completed a hunt....using 50#@28 Mohawk Sparrowhawk, doug fir shaft, Ribtek 190 heads with turkey fletching.
Downed a 150-160+ lb old boar....cutters about 3+ inches from gumline to tip....he started broadside and turned to prepare to run and hesitated. 10-15yds away...arrow entered just at right rear ham angling towards front left shoulder....arrow nock disappeared in the boar with it entering him fully.
Hour later he was found watching his back trail less than 75 yds away....hurt bad and unable to run or fight. Finished him there then drug him 150 yds through Marsh and mud and 6-8foot tall reed grass to the islands edge to the boat.
reasonable bow weight with reasonable arrow weight and very sharp broadhead for maximum penetration...shot placement and arrow weight I think are more important than speed and all that other mess. SHOT PLACEMENT being the number one aspect. There is NO MAGIC BULLET....a bow you can shoot a heavy shaft accurately...and then your own skills getting close to make the shot.
The weight of arrow keeps the arrow in motion going through thick hide and bone and muscle...but unless it hits vitals he is not going to stop and may not bleed much anyhow.
I put these on the Dangerous Game thread but here is pic...hard to see pig as he is sinking in marsh mud and looks black...but was blonde on whole body except for strip of jet black long hair from forehead to tail.
Bow was prototype Sparrowhawk Rob D tested two years ago and wrote up here for Mohawk Bows.
45# will do it as well...I have no doubt with right arrow and broadhead and an accurate shot.