Accidentally, ran into this "study" comparing the penetration of different types of broadheads. The "study" appears to be pretty good without any noticable bias.
I will never trust expandable bh again. I have tried two different ones with bad results. They did manage to kill the deer but did not pass all the way through and that isnt good for tracking. I've used 100 g muzzys for the last 7 years and they have passed through every time. They work great and the deer sure dont like them.
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Patience, Persistance, Preparation and Practice.