New bowhunters spend a lot of energy chasing draw weight — more pounds, more perceived power, more confidence that the shot will do its job. Draw weight determines how much kinetic energy an arrow carries, but energy alone doesn't kill an animal. An arrow kills through hemorrhage, by cutting enough tissue and blood vessels to cause rapid blood loss, and the part of the setup that actually does that cutting is the broadhead — not the bow. Which broadhead a hunter chooses changes the wound itself in ways draw weight never will.
Unlike a bullet, an arrow doesn't rely on shock or blunt energy transfer — a broadhead has to physically slice through enough vessels and tissue to produce fast, significant blood loss. That means the size, shape, and number of the cutting edges the broadhead presents at the moment of impact matter more to a clean kill than how much energy was behind the shot. A narrow, poorly placed cut from an overpowered bow can perform worse than a wide, well-placed cut from a modest one.
A fixed-blade broadhead has no moving parts — the cutting edges are set in their final position from the moment it leaves the bow to the moment it hits. That simplicity means nothing has to deploy correctly for the head to work, and it tends to hold together better when it meets heavier resistance like bone or a shoulder blade, since none of its impact energy is spent opening anything. The trade-off is aerodynamic: a fixed blade's exposed edges act like small fins in flight, which can cause the arrow to plane or steer slightly off a pure field-point trajectory, especially at longer distances or in wind. That's why fixed-blade shooters typically have to tune and practice specifically with their broadheads rather than assuming field-point practice translates directly.
A mechanical broadhead keeps its blades folded against the ferrule in flight, so its profile is close to a simple field point — which is why mechanicals often group more predictably with field-point practice and are popular with hunters who don't want to separately tune broadhead flight. On impact, the blades deploy outward, typically cutting a wider diameter than a comparable fixed blade, which tends to produce a larger wound channel and an easier blood trail to follow. The trade-off is that deployment is a mechanism, and mechanisms can fail: blades can open prematurely on brush or a limb before the shot even reaches the animal, rubber bands or O-rings can weaken with age or cold, and the energy spent deploying the blades on impact is energy not spent on penetration — a real concern on a marginal hit or heavier bone structure.
Draw weight affects how much energy is available to drive an arrow through an animal; the broadhead determines how efficiently that energy gets converted into a lethal wound. A hunter shooting a heavier bow with a broadhead that flies inconsistently or fails to cut effectively is worse off than one shooting a lighter bow with a head that flies true and cuts reliably. The broadhead is the actual interface between the arrow and the animal — draw weight only supplies the energy that broadhead gets to use.
Fixed blades tend to be favored for bigger, heavier-boned game or hunters prioritizing certainty that the head will hold up on a tough hit. Mechanicals tend to be favored where a wider wound channel and an easier-to-follow blood trail matter more, and where the hunter has confirmed their bow's setup reliably deploys the blades in testing. Some states also restrict certain broadhead types during specific seasons, which makes checking local regulations as much a part of this decision as the mechanical trade-offs themselves.
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