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Weapons & Marksmanship Fundamentals Core

Archery & Crossbow Basics

Lesson 26 of 60 · Module 4, lesson 5

Your objective

By the end, you'll be able to explain how a compound bow and a crossbow work, the core gear terms, and why bowhunting demands a short, honest effective range.

Concept ~9 min

A buck steps into the food plot at 50 yards — easy with a rifle, but you’re holding a bow. Do you draw? With archery gear, that 50 yards might as well be 500. The whole game changes when your projectile is a slow, heavy arrow that drops fast and kills by cutting. This lesson is the gear and the math behind that decision.

Safety check

Quick recall from Safety First — a crossbow is cocked and resting on the rail in your lap. How should you think of it?

Quick recall from Safety First — a crossbow is cocked and resting on the rail in your lap. How should you think of it?

Two ways to launch an arrow

You’ll hear about several bow types, but two dominate modern hunting: the compound bow and the crossbow. Both store energy in bent limbs and release it into an arrow — they just do it very differently.

A compound bow is the most popular bow for hunting. Wheels and cams on the ends of the limbs store energy as you draw and, past a “peak weight” mid-draw, roll over to reduce the weight you actually hold at full draw (Bowhunter-ed, The Compound Bow). You draw it by hand, hold, aim, and release with your fingers or a release aid.

A crossbow mounts horizontal limbs on a stock with a trigger, like a gun. You cock it once — mechanically, with a crank or rope — and a latch captures and holds the string until the trigger releases it (Bowhunter-ed, Parts of a Crossbow). That means it stays cocked and ready, and you aim it off a rest like a rifle.

Draw weight and let-off

Draw weight is the force, in pounds, needed to pull the string back. It’s the single number people fixate on, and it does matter: arrow speed and energy climb with it. Most states set a legal minimum draw weight for hunting big game — commonly around 40 lb, though some differ — so this is the first thing to check locally (Easton, minimum draw weight for whitetail).

Let-off is the compound bow’s trick. Because the cams roll over past peak weight, at full draw you hold only a fraction of the peak — modern bows commonly let off 65–85% of the weight. A 70 lb bow at 80% let-off means you hold roughly 14 lb at full draw, so you can settle, aim, and wait for the shot without shaking.

Diagram of a compound bow's draw-force curve. The holding weight rises steeply to a peak partway through the draw, then the cams roll over and the weight drops sharply to a low value held at full draw.
Peak weight (hardest pull) Let-off — what you hold at full draw
Diagram (not a photo). The curve rises to PEAK weight, then the cams roll over and the weight drops to the low 'let-off' weight you actually hold at full draw.
Deep dive Crossbows: power stroke and speed (FPS)

Crossbows describe their power differently. Power stroke is how far the string travels from cocked to released — a longer power stroke makes more speed. Modern hunting crossbows commonly launch bolts around 350–460 feet per second (fps), and flagship models advertise 500+ fps; roughly 300 fps is plenty for deer inside about 40 yards. Many states also set a minimum crossbow draw weight (commonly cited near 125 lb) and require a mechanical safety — one more thing to verify with your state agency (TenPoint, U.S. crossbow regulations overview — a pointer only; the state is the authority).

Arrows and broadheads

An arrow has four parts: the shaft (the body, usually carbon for hunting), the fletching (vanes that spin and stabilize it), the nock (the slotted tail that snaps onto the string), and the point up front (Hunter-ed, Parts of an Arrow). The shaft’s stiffness, called spine, must be matched to your bow or the arrow flies erratically (Bowhunter-ed, The Shaft).

You practice with cheap field points, but you hunt with a broadhead — a bladed point that kills by cutting and causing rapid blood loss. Broadheads come in fixed-blade (no moving parts, rugged and reliable) and mechanical / expandable (blades fold in for flight, deploy on impact, and often fly closer to a field point) (Bowhunter-ed, Broadheads). Both work — but a broadhead must be razor sharp, and you must confirm it hits the same spot as your field points before you hunt.

Because an arrow kills by hemorrhage, arrow energy and penetration matter more than raw speed. Easton’s guideline pairs kinetic energy to game size: roughly 25–41 ft-lbs for deer, and 42–65 ft-lbs for elk and bear (Deer & Deer Hunting, citing Easton).

The honest range problem

Here is the heart of bowhunting. An arrow is slow and drops fast, so a small error in distance becomes a big error at the target. The official bowhunter-ed standard: the average bowhunter’s maximum effective range is about 30 yards, and many shoot closer (Bowhunter-ed, Ethical Hunting and the Risks of Long Shots). Bowhunter-ed calls your real limit your “zone of confidence” — the range at which you are assured of vital, trackable hits — and tells you to start close and only extend it as your accuracy holds (Bowhunter-ed, Advanced Archery Practice).

Check the calls

Knowledge check

On a compound bow, what does 'let-off' describe?

On a compound bow, what does 'let-off' describe?

Knowledge check

You can keep all your arrows in the deer's vital zone out to 30 yards, but past that they scatter. A buck is feeding at 45 yards, calm and unaware. The ethical call is to…

You can keep all your arrows in the deer's vital zone out to 30 yards, but past that they scatter. A buck is feeding at 45 yards, calm and unaware. The ethical call is to…

Set up your first rig

You’re putting together a beginner deer setup. Make the calls that keep it legal and ethical.

Decision

At the pro shop you're choosing a draw weight. You can pull 55 lb but it's a strain to hold steady. What do you set it to?

Take it to the woods

Find your honest effective range

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Sources

If you remember nothing else

  • A compound bow uses cams to store energy and to let off most of the holding weight at full draw; a crossbow holds the string cocked on a latch and fires from a stock with a trigger.
  • Draw weight is the force to pull the string; most states set a legal minimum for big game (commonly around 40 lb). Let-off is how much of that weight the cams hold for you at full draw.
  • An arrow is shaft, fletching, nock, and point. For hunting you swap field points for a sharp broadhead — fixed-blade or mechanical — and arrow energy drives penetration through the vitals.
  • Effective range is short and personal. The average bowhunter's max is about 30 yards; only shoot inside the distance where you keep every arrow in the vital zone.
  • Crossbow and archery legality and seasons vary by state — verify current SCDNR regs before you hunt.

How ready do you feel?

How ready are you to explain how a bow or crossbow works and to name an honest effective range you'd actually shoot inside of?

Before you go — a quick look back

Distributed practice: one fast recall from an earlier lesson keeps it from fading.

Quick recall

From Firearms Safety & The Four Rules — which rule still applies the instant you nock an arrow or cock a crossbow, even though it isn't a firearm?

From Firearms Safety & The Four Rules — which rule still applies the instant you nock an arrow or cock a crossbow, even though it isn't a firearm?

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