Looking for the best 75 grain mech. head. I will be delivering over 90lbs of KE.

Is a bigger cutting dia. better?
2 blade vs. 3 blade?
Should I use fixed heads instead?<img src=icon_smile_question.gif border=0 align=middle>

Please help, I have a hunt in Pike County IL. this weekend!
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Good judgment comes from years of bad judgment.