I've had good results with fixed blade 4-blade Zwickey heads, replaceable fixed blade 3-blade heads and for the past decade mechanical expandables. Presently shoot 3-blade NAP Spitfire 1.5" mechanical heads.....had good blood trails, get excellent arrow flight, and they are adequately tough. Biggest critter with them was a dandy polar bear. Also have arrowed an elk, 6 black bears, a couple Coues bucks plus a Dall ram and a couple caribou with the Spitfires.
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