How to Choose the Best Hunting Arrow - Heavy vs. Light

Curt Wells and Randy Ulmer [video] explain the importance of momentum and penetration when choosing heavy vs. light arrows for bowhunting.

Whether you bowhunt with a recurve bow, a longbow, or a compound bow, choosing the best hunting arrow is critical to success. That arrow must be the correct length, straight, and stiff enough to fly well out of your bow.

Just as critical is arrow weight because that affects penetration and bowhunting is all about achieving two-hole penetration, profuse bloodtrails, and quick, humane death.

The eternal debate over which arrow is better - light and fast or heavy and slow - will never end, but it's really very simple physics. Heavy arrows penetrate better.

The first reason why it's important to choose the best hunting arrow is because once an arrow leaves the string it ceases to be propelled. Force, in the form of drag, immediately begins to work against the arrow, causing it to decelerate.


That force has a greater effect on the faster arrow (see Newton's Second Law of Motion) so it decelerates faster than the slower arrow. When an arrow hits an animal, the difference in deceleration can be dramatic because the heavier arrow will have a slower deceleration rate, thus penetrating deeper.


The Best Hunting Arrow Is?

If this were not the case traditional archers seeking maximum penetration would shoot the lightest arrows they could find, when just the opposite is true.


Yet another testament is the poor arrow penetration often seen on hunting shows on television. My guess is it's the result of some bowhunters who believe the best hunting arrow is a light arrow. Unfortunately, when bowhunters only focus on maximum arrow speed they often end up on a misguided quest.

Most bowhunters cite kinetic energy when referring to the penetration potential of their bow setups but it's really momentum that determines how well an arrow will drive through an animal. Let's look at the numbers in the table below, which compares three bow set-ups, a compound with a light arrow, a compound with a heavy arrow, and a comparatively slow traditional bow with an ultra-heavy arrow.

Arrow Weight Arrow Speed Kinetic Energy Momentum
350 gr. 340 fps 89.75 ft. lbs. .527 Slug/ft. per. sec
480 gr. 290 fps 89.54 ft. lbs. .617 Slug/ft. per. sec
750 gr. 175 fps 50.95 ft. lbs. .582 Slug/ft. per. sec

Note the high-speed setup generates nearly equal kinetic energy to the compound with the heavier arrow, but the momentum is significantly higher with the heavier, slower setup. Most notably, and maybe even a bit surprising, the very slow and very heavy traditional arrow creates much less kinetic energy but still generates more momentum than the compound setup with the light, fast arrow.


Why Momentum Matters

So what is the right arrow weight? That's a question that must be applied individually based on your draw weight, draw length, and species of game being hunted. A deer hunter can get away with a lighter arrow when the shot is perfect. But what if it isn't? That is when you need all the momentum you can muster.

Personally, I believe the best hunting arrow/broadhead combination in one that weighs at least 400 grains. My typical arrow for most species weighs around 450 grains but for 2015 I'm increasing my arrow weight by shooting a 29-inch Easton Deep Six XD shaft with a 100-grain Rage Hypodermic broadhead and a Lumenok for a total arrow weight of 488 grains.

At my draw length of 30 inches and with a draw weight of about 67 pounds, that arrow is generating more than enough momentum for any North American big-game species.


Best arrows for bowhunting

If you have a shorter draw length, and/or you shoot less draw weight, choosing a lightweight arrow shaft to gain speed is actually counterproductive when it comes to penetration.

I know that doesn't sound logical, but think of the traditional archer shooting a heavy, slow arrow that passes completely through a 1,500-pound bull moose. If you're not confident that your lightweight, fast arrow can do that, then you're not shooting the best hunting arrow.

Strive for Maximum Penetration

The only tangible disadvantage to a heavier shaft is the increased trajectory of the arrow in flight. That makes yardage estimation more critical but a good rangefinder mitigates the trajectory problem. Experienced western bowhunters, who tend to shoot game at longer distances, often opt for a heavier shaft because it is less susceptible to wind drift and it hits harder when it does connect.

Certainly, there are many factors, like bow tune, fletching and broadhead design, that determine how well an arrow performs in flight and on impact.

Still, some ask if their arrow zips through a deer now, why do they need more penetration? The answer is, you choose the best hunting arrow and broadhead combination not for what it will do when the shot is perfect, but for what it can do for you when your shot isn't perfect.

There's no such thing as overkill.

Recommended for You

Check out our top picks for the year's best new bowhunting packs! ATA Show

New Hunting Packs for 2019

Brian Strickland - January 10, 2019

Check out our top picks for the year's best new bowhunting packs!

New year, new look at your whitetail ground How-To

Summer Scouting from Scratch

Tony J. Peterson

New year, new look at your whitetail ground

As a bowhunter, you need complete faith in your physical ability to hike in to your hunting ground, stalk your prey, pull your bow stealthily and pack out your animal. That means it's essential to train for your hunt. How-To

10 Workout Routines Every Bowhunter Should Master

Adam Holt

As a bowhunter, you need complete faith in your physical ability to hike in to your hunting...

See More Recommendations

Popular Videos

Turkey Decoy Beatdown

Turkey Decoy Beatdown

Bowhunter contributor Matt Palmquist witnesses a hen trying to destroy one of his decoys while hunting turkeys in Kansas.

Mountain Caribou Hunt

Mountain Caribou Hunt

Curt Wells can't pass up this opportunity to hunt mountain caribou in the Northwest Territories.

Elk Bulls Abound in Colorado

Elk Bulls Abound in Colorado

Bowhunter team member Rudy Bachraty gets his chance to take an elk with Cross Mountain Outfitters of Colorado.

See more Popular Videos

Trending Stories

Here's how to choose vanes that will yield the best accuracy, forgiveness, and trajectory. Arrows & Broadheads

What Are the Best Vanes For Hunting?

Joe Bell

Here's how to choose vanes that will yield the best accuracy, forgiveness, and trajectory.

Archer Chris Cammack has arrowed the new world record for brown bears with his Alaskan giant. Other Game

Massive Alaskan Brown Bear is the New World Record

Lynn Burkhead - October 18, 2018

Archer Chris Cammack has arrowed the new world record for brown bears with his Alaskan giant.

This past fall my twin daughters started kindergarten, which meant that I stopped paying for Bows

9 Top Budget Bows for 2018

Tony J. Peterson - February 20, 2018

This past fall my twin daughters started kindergarten, which meant that I stopped paying for

See More Stories

More How-To

Follow these tips for spotting and stalking mule deer with a bow! How-To

Tips for Stalking Mule Deer

Matt Palmquist

Follow these tips for spotting and stalking mule deer with a bow!

Taking long-distance shots at big-game animals has become acceptable, but here's why it isn't the ethical choice. Conservation

Is it Ethical to Take Long-Distance Bowhunting Shots?

Curt Wells

Taking long-distance shots at big-game animals has become acceptable, but here's why it isn't...

Staying physically relaxed when at full draw is critical. How-To

Relax Your Bow Arm for Increased Accuracy

Levi Morgan

Staying physically relaxed when at full draw is critical.

See More How-To

GET THE MAGAZINE Subscribe & Save

Temporary Price Reduction

SUBSCRIBE NOW

Give a Gift   |   Subscriber Services

PREVIEW THIS MONTH'S ISSUE

GET THE NEWSLETTER Join the List and Never Miss a Thing.