I disagree with anysharp bladetalkand blood trails. If the arrow passes through ..regardless of dull or sharp......you have a large blood trail....

I do believe sharper blades will help with penetration....but lets be real...with the speed most of us compound shooters are using ...does it matter? Dull or not...at 20 yards @ 290 FPS + you're going through lungs.

I have taken multiple animals with the same NAP spitfire mechanical..over and over...I clean the hair and tissue out of the grooves and they continue to work fine.