Most states have minimum bow draw-weights for deer hunting, which can certainly be used as the starting point. A sharp, 3-blade fixed broadhead is what you need. Rules are rules whether you agree with them or not. My PH was shocked that my little 42lb bow with such a short draw length could get that much penetration on such a large animal. It can resist shot after shot, that too without ruining its shape or integrity. I am unsure about mechanicals having larger margin of error.
Stay with steel broadheads that are time proven with in-field experience on big game. While some mechanical blades are as thin as. Their advertising has made it sound like there was a problem to be solved. Leading Edges - Chisel Tip vs Cut on Contact Broadheads that use a chisel tip will punch through an animal's tough hide before the broadhead's blade surface begins to cut. Smaller shaft diameters also mean there is less surface area cross-section for wind to push against and move the shaft off its trajectory, so accuracy is also a major benefit.
Hunting Arrows, Compound Bow Arrows | Archery Supplies Australia
The available profiles differ greatly. For me, I like to have both in my quiver. The weight needs to match your arrows. Some of the kinetic energy at the point of impact is used to expand the blades, so theoretically mechanical broadheads will always have less penetrating power than fixed blade broadheads. The main thing is to find which type you personally like and try different brands to see what fits best.
There are a cumulative number of factors that add up resulting in an ethical shot on wild game. First, inspect for breaks, cracks, and chips. Once bowhunters actually try heavier arrows with the right kinds of broadheads they never go back. Once you are done inspecting the broadheads, take a closer look at your arrows. I had a father bring his son to our Quality Deer Hunter proficiency test last year with that in mind. This gives the archer a facility to replace the dull or damaged blades. Sign up today and get a special offer for your next purchase!