I killed two deer with Magnus 2-Blades, and the first, a double lunged doe gave an amazing blood trail, I mean, blood-sprayed two feet off the trail (Im assuming I hit an artery) and nearly non-stop blood. The next wasa spike. I shot him quartering away and only got gut-liver-lung, so the blood trail was non-existant 'cept for a puddle and a few specks...So, both good and bad...the bleeder blades couldnt hurt though...

I'd go with the bleeder blades for deer.
Just my two cents...

Good luck!