If I'm not mistaken, there was a study done in MS that statistically suggested that mechanicals had the edge in recovered deer. Also, it's nice not to have to sight in broad heads and tear up targets. I've never had my Muzzys hit where my field points do, but I have no doubts that my Grim Reapers will.
On the other hand, if your Slick Tricks fly as well as your field points, I don't know that I'd make the switch. Honestly, despite what I've already said, I went to mechanicals mainly because I just couldn't get my Muzzys to group like my field points.
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