Great story..and yes it is amazing how far they can run with the lungs gone..had very similar experience with the first antelope I ever shot using a 300 Win mag..it still ran about 80 yards before tipping over --and it had no idea I was there..was feeding when I shot him...
Congrats on the antelope..
Ripp
-------------------- ALL MEN DIE, BUT FEW MEN TRULY LIVE..