Heavy vs Light Arrows: Which Weight Should You Shoot?
Shoot a heavier arrow, roughly 425 to 500 grains, if you hunt: it carries more momentum, penetrates better, and makes the bow quieter. Shoot a lighter arrow, still above 5 grains per pound of draw weight, if you shoot 3D or unknown-distance target where a flatter trajectory forgives range estimation errors. Never drop below 5 grains per pound for any reason.
Arrow weight is the single tuning variable that changes everything downstream: speed, trajectory, energy, noise, and how the bow feels in your hand. The debate looks like speed versus penetration, but the useful framing is different. Light arrows buy forgiveness of distance error. Heavy arrows buy forgiveness of everything else.
The verdict
Go heavy if you hunt. A 425 to 500 grain total arrow from a modern compound gives up 30 to 50 fps against a light build and returns quieter shots, less hand shock, more momentum, and better performance if you hit something you did not intend to. Since you should be ranging every shot anyway, the trajectory cost is manageable.
Go light if you shoot 3D or unknown distance target. When a yardage guess is the main error source, a flat trajectory shrinks the penalty for guessing wrong. That is a scoring advantage that does not exist in hunting, where you have a rangefinder and time.
Go very heavy, past 550 grains, only with a reason. Elk, moose, low draw weight setups, and traditional bows all qualify. Chasing extreme front of centre on a whitetail bow at 25 yards is solving a problem you do not have, and the trajectory cost is real.
Head to head
| Factor | Light, 350 to 400 gr | Mid, 400 to 475 gr | Heavy, 475 to 600 gr |
|---|---|---|---|
| Speed from a 320 IBO bow | ~290 to 300 fps | ~265 to 285 fps | ~235 to 265 fps |
| Trajectory | Flattest | Manageable | Steepest |
| Momentum | Lowest | Good | Highest |
| Bow noise and vibration | Loudest | Moderate | Quietest |
| Wind drift | Most affected | Moderate | Least affected |
| Typical use | 3D, target | Whitetail, general hunting | Elk and larger, traditional |
Speeds are approximations from the IBO relationship of roughly 1 fps per 3 grains over 350, at a 30 inch draw and 70 pounds. Your real figures depend on draw length, accessories, and string weight. Chronograph if you need certainty.
Energy versus momentum
These two numbers get used interchangeably and they should not be. Kinetic energy is grains x fps² / 450,240, so it scales with the square of speed and therefore rewards light, fast arrows. Momentum is grains x fps / 225,218, scaling linearly with both, which rewards mass.
For a projectile that has to keep moving through resistance, momentum is the better predictor. That is the physics behind the heavy arrow trend, and it is why two arrows with identical kinetic energy can behave very differently. Run both numbers for your build on the kinetic energy and momentum calculator rather than trusting one figure.
The 5 grain per pound floor is not negotiable
Every arrow weight conversation has to start here. Total arrow weight must be at least 5 grains per pound of your bow's peak draw weight. A 60 pound bow needs 300 grains minimum, a 70 pound bow needs 350. Below that, too much stored energy stays in the limbs rather than leaving with the arrow, which is functionally a partial dry fire.
The consequences are cracked limbs, damaged cams, a voided warranty, and in a bad case a bow that comes apart at full draw. Some manufacturers set their own higher minimum, so check your bow's documentation. Build your weight properly with the total arrow weight calculator, counting shaft, insert, point, nock, vanes, wrap, and glue. People miss the insert and the wrap and end up 30 grains short of what they thought.
Weight changes your spine, not just your speed
Adding weight at the front of the arrow, which is how most people add mass, weakens dynamic spine. Going from a 100 grain to a 150 grain point can push you a full spine group, and adding a 50 grain brass insert on top of that pushes you further. If you build heavy without changing shafts, your arrows may now be underspined and your broadheads will tell you so.
Check the change on the arrow spine calculator and confirm against the spine chart before ordering points. The related benefit is that forward weight raises front of centre, and the standard targets are 7 to 12 percent for general shooting, 10 to 15 percent for hunting, and 19 percent and above for extreme FOC builds.
Noise, vibration, and the part nobody puts on a spec sheet
A heavier arrow absorbs more of the bow's stored energy, so less of it is left over to shake the riser and make noise. The difference between a 380 grain and a 500 grain arrow from the same bow is audible and easy to feel. For a hunter, a quieter bow is a genuine advantage, since a string-jumpy animal reacts to sound.
Light arrows do the opposite. They leave more residual energy in the bow, which shows up as hand shock, noise, and accelerated wear on strings and cables. This is a real reason to keep a comfortable margin above the 5 grain minimum rather than sitting exactly on it.
Practical grain targets
- Whitetail, modern compound, 60 to 70 lb: 425 to 475 gr total.
- Elk, moose, or larger: 500 to 600 gr with high FOC and a strong fixed head.
- Turkey and small game: arrow weight is not the constraint, head choice is.
- 3D and unknown distance: as light as your class allows above the 5 gr/lb floor.
- Youth or low draw weight, under 45 lb: keep total weight moderate, use a light point and a properly weak spine, and shoot closer.
- Traditional recurve or longbow: 9 to 12 gr/lb is a common traditional target, well above compound practice.
Related reading
Frequently asked questions
What is the ideal arrow weight for hunting?
For whitetail-sized animals with a modern compound, 400 to 475 grains total is the mainstream answer and it balances speed against penetration well. For elk and larger, 475 to 600 grains is a better target because momentum matters more than trajectory at those energies. Never go below 5 grains per pound of your bow draw weight regardless of the animal.
Is a heavier arrow always more accurate?
Not inherently, but heavier arrows are more forgiving of wind and of small form errors because they carry more momentum and are less affected by crosswind. They also drop faster, so they are less forgiving of a range estimation error. The net effect for most archers inside 40 yards is that heavy arrows shoot at least as well.
What is the 5 grains per pound rule?
It is the minimum total arrow weight most bow manufacturers require: five grains of arrow for every pound of peak draw weight. A 70 pound bow needs at least a 350 grain arrow. Going lighter leaves too much energy in the bow rather than the arrow, which is close to a dry fire and can crack limbs or cams. It also voids most warranties.
How much speed do I lose per grain of arrow weight?
A useful rule of thumb is about 1 fps lost for every 3 grains added above the IBO standard of 350 grains. So a 500 grain arrow from a 320 fps IBO bow gives up roughly 50 fps against the rating before you account for draw length and accessories. Use that as an estimate and chronograph if you need a real number.
Do heavy arrows really penetrate better?
They carry more momentum for the same bow, and momentum is the better predictor of how a projectile continues through resistance. Heavy arrows also tend to have higher front of centre, which improves the way the arrow tracks. The practical caveat is that a heavy arrow with a dull broadhead or a bad tune does not penetrate well, so the whole system matters.
Are light arrows ever the right choice?
Yes, for target and 3D where a flatter trajectory reduces the cost of misjudging distance, and for archers with a lower draw weight who need to reach a target at distance. Light in this context still means above the 5 grain per pound minimum. Light arrows also make a bow louder and harsher, which is a real downside in the field.
How we choose: we compare published manufacturer specifications, verified owner reviews, and pro shop guidance. We do not test gear in person. Draw weight and arrow spine affect safety, so follow your bow manufacturer's specifications and have setup work checked by a qualified pro shop.