Menu
Back to Skills

Selecting the correct rifle cartridge for your needs

 

Selecting the right rifle cartridge for hunting
Photo credit: Stefan Wilson

Choosing a rifle can be a daunting task. Not only do you have to find a rifle that fits you and is comfortable to shoot, but you also have to then choose the right chambering of that rifle for the specific round you want to shoot. A variety of different factors play into that decision: what size game will you be hunting? What range will you be shooting? Do you want a chambering with a lot of available ammunition? What about recoil?

With so many factors influencing your rifle cartridge selection, it is important to understand the minute details of each that will affect your choice.

Before we begin, I feel it necessary to make a disclaimer up front. I am not promoting one specific cartridge as the "best all-around" cartridge. I have seen way too many internet comment threads that dissolved into complete insanity and childish name-calling as a result of someone choosing a rifle cartridge that someone else was not a fan of.

Instead, this article will seek to give you the information on which to base your own decision.

Basics about rifle cartridges

There are three words that you need to know before we go any further: caliber, casing, and cartridge.

Caliber
 

Large caliber rifle cartridge for hunting
Photo credit: Brady Miller

This refers to the diameter of the projectile being fired (e.g., the bullet). Bullets come in all kinds of different sizes, but the two most common measurements are inches and millimeters. Here are some examples: a bullet from a .243 is a .24 caliber bullet because it is .24 inches in diameter. A 7mm-08 is a 7mm caliber bullet because the bullet is 7mm in diameter. Make sense? If multiple chamberings have the same caliber, then the bullet diameter is the same for all of them. The bullet diameter is the same for .30-06, .30-30, .300 Winchester Magnum, and .300 Weatherby Magnum — the differences lie in the weight of the bullet and the amount of powder that is propelling the bullet downrange.

Casing
 

Large caliber rifle casing
Photo credit: Brady Miller

This refers to the brass that holds the powder charge behind the bullet. A casing is nothing but a paperweight if it doesn't have a primer, powder, and a bullet. Casings differ in shape and length depending on the chambering of the rifle for which they are intended because different cartridges require differing amounts of powder to push the bullet at varying speeds.

Cartridge
 

338 Edge rifle cartridge for hunting
Photo credit: Brady Miller

This refers to what you get when you put everything together. A .30 caliber bullet inside of a .30-06 casing will result in a .30-06 cartridge that can now be fired out of a rifle that is chambered in .30-06. You still following?

Rifle cartridges and recoil

Simple physics becomes clear when you start talking about pushing a larger, heavier bullet at speeds that are equal to its smaller, lighter peers. Newton's third law of motion tells us that for every action there is an equal and opposite reaction. This means that the same force that is driving that bullet forward is also driving your rifle backward. This is called recoil and it only takes one pull of the trigger on a high-power rifle to know it well.

This is all based on a simple formula that tells us that mass and velocity lead to energy (E=1/2MV²). I'm not going to solve for recoil energy, but the fact remains that propelling a bullet downrange at high velocities requires a great deal of energy and that energy is driving right back into your shoulder. This is why high velocity, large caliber rifles kick so hard. The energy created from that .338 Weatherby Magnum is just too much to make that 7 lb rifle easy to manage.

You might think that simply finding the sweet spot of large bullet size and manageable recoil would be the ticket to choosing your new rifle, but it isn't that simple.

Common mindset toward choosing a rifle
 

Brady Miller shooting Browning X Bolt Hells Canyon Speed rifle
Browning X-Bolt Hells Canyon SPEED rifle in .a 26 Nosler caliber. Photo credit: Brady Miller

Things start to get confusing when people start allowing conjecture and assumptions to rule the day. Here are a few common misconceptions that often lead people astray when trying to choose a rifle cartridge:

"Bigger is better"

Proponents of this mindset will say, "If a .26 caliber bullet can do the job, then I know a .30 caliber bullet will do the job even better." While this might be true in some circumstances, bigger is not always better. If shooting that larger caliber means that I feel more recoil and I am no longer able to shoot the rifle without flinching; this reduces my accuracy. The tradeoff was not worth it.

"The faster the better"

If you have the need for speed, this might be you. Speed is great as it means flatter trajectories and more kinetic energy downrange, but at what point do we say, "That's fast enough to kill anything that moves?" 2,600 fps? 2,800 fps? 3,200 fps? Remember that speed comes at a cost and it is usually paid in a harder recoil, louder report, and shorter barrel life. Finding a good compromising point is prudent for many.

"If it doesn't say 'Magnum', it isn't good enough"

I know of plenty of hunters who own multiple rifles and the only thing the rifles have in common is the word "magnum." It doesn't have to say magnum to kill even the largest of animals. For years the .30-06 was king and, last I checked, it still kills things just as dead as it did 50 years ago. Plus, with the advent of modern hunting bullets, non-magnum cartridges are more effective than ever.

Factors required for an ethical harvest of an animal
 

Mule deer buck taken with 300 win mag rifle
Photo credit: Brady Miller

With the basics and some misunderstandings out of the way, let's address the factors that must be present for the ethical harvesting of any animal: penetration, placement, and wound channel.

Penetration

This refers to the bullet’s ability to go deep into the animal's vitals, preferably all the way through, exiting on the other side. This allows for maximum blood loss and vital damage. Penetration is the result of momentum, which results in kinetic energy; speed is not the determining factor for penetration. A bowling ball rolling at 10 mph has more momentum than a 100 mph fastball. A heavier bullet moving at a moderate speed will result in better penetration than a lighter bullet that is flying at a faster rate of speed.

Placement

This is by far the most important factor in ethically killing any animal. A poorly placed shot with a high power, high-speed cartridge will likely result in a wounded and lost animal. A well-placed shot with a smaller, milder cartridge using a quality bullet will nearly always result in a quick kill. Bullet placement is absolutely paramount.

An effective wound channel

This is another necessary factor. The wound channel is the damage that is caused as the bullet passes through the body cavity. It does not make a clean hole, but instead makes a ragged, expanded chasm through its path. Larger bullets tend to make larger wound channels, but bullet choice is ultimately the largest factor, not only size. A smaller bullet that expands well and retains its weight will cause a more effective wound channel than a larger bullet that breaks apart. Yet, all things being equal, a larger, heavier, and faster bullet will cause more damage, which gives the shooter a cushion for error in the event that errors occur (which they do).

Combining these three factors will result in an ethical, quick kill of an animal… every time.

Continued below.

Find the hunts you want with goHUNT INSIDER promo code gear

How to find the right rifle cartridge for you
 

Loading rifle cartridges
Photo credit: Stefan Wilson

How do you find the right rifle cartridge for you? Here are a couple of questions that I like to ask whenever trying to select a new rifle:

What is the largest bullet that I reasonably need to harvest the animal I want to hunt?

If you are hunting antelope, you don't need a .338 Lapua (.33 caliber) when a .25-06 (.25 caliber) or 6.5 Creedmoor (6.5mm) will do just fine.

What is my recoil threshold?

We all have one. It is the point where I am no longer able to comfortably and confidently squeeze the trigger with absolutely zero flinching. Flinching means missed shots. Whatever amount of recoil causes me to flinch is too much.

What is my budget for ammunition?

If money’s‘ no object, then you can shoot any cartridge you want, but if you need something that costs less than $20 per box, your choices will be reduced considerably. Some of the most common and affordable cartridges include .243, .270, .30-06, .308, and others. Magnums tend to be pricier than their non-magnum counterparts.

Am I letting others' opinions influence my decision?

Are you worried about what people will think when you roll up with your .260 Remington in elk camp? Don't be! Other people's opinions should not play into your rifle choices. You have to live with your choice, not them. Don't let others make your choice for you.

General guidelines for rifle cartridges
 

.30-06 rifle cartridge for hunting
.30-06 rifle cartridge. Photo credit: Stefan Wilson

For the sake of helping to distill down all of the options to a manageable list, here is a basic list of the range of rifle calibers that would be appropriate for various sized game:

Common caliber sizes for big game

Animal category Rifle caliber size
Deer and smaller .243 to .30-06
Elk and similar sized gme .260 to .300 Magnum
Larger game (grizzly bear, moose, etc.) 7mm Magnum to .338 Magnum


 

7mm magnum rifle cartridge for hunting
7mm Remington Magnum rifle cartridge. Photo credit: Stefan Wilson

There are also great alternatives to some of the older cartridges. For example, the .308 has long been used as an effective hunting round, but some wanted to shoot a 6.5mm and a 7mm bullet from the .308 casing. Thus, the .260 Remington (6.5mm) and the 7mm-08 were born. These are very effective, tame, and fun-to-shoot rounds that have put down even the largest of animals with a well-placed shot. Be sure to investigate these options as they fall well within the necessary size and velocity for harvesting large game.

There is no such thing as a perfect cartridge
 

Browning X-Bolt speed rifle in 26 Nosler caliber
Browning X-Bolt Hells Canyon SPEED rifle in .a 26 Nosler caliber. Photo credit: Brady Miller

The information in this article is meant to help you make a decision, not make your decision for you. Only you know your exact needs and limits. No rifle round will be the perfect blend of everything. You must choose what your biggest needs are and then compromise as necessary on the others. For me, I know that I mainly hunt elk and mule deer with a rifle and that I will reasonably take shots out to 300 yards. I can handle a decent amount of recoil and wanted something that had been around for a while and wasn't going anywhere so that there would be plenty of ammo available. All of these factors led me to the 7mm Remington Magnum — not because I had to have a magnum (I hunted with a .30-06 for almost 20 years), but because it met the most needs on my list while still being easy to shoot consistently and accurately. I plan on adding a .260 Remington or 6.5 Creedmoor to my gun safe for my wife to use on elk and deer hunts because that is the cartridge that will suit her best for her needs.

Ultimately, you have to live with your own decisions. Make them carefully. Make them confidently. Then enjoy shooting your new rifle.

Also, be sure to enter to win one of FIVE Browning X-Bolt Hells Canyon Speed rifles in goHUNT's April INSIDER giveaway.

Learn more here

3 Comments

Log in or register to post comments.

scott.lewis60
Scott L. - posted 1 year ago on 05-23-2016 11:58:24 am
Mohave Co., Arizona
goHUNT INSIDER

Excellent article! " A bowling ball rolling at 10 mph has more momentum than a 100 mph fastball." Is a great analogy.

But, as I'm sure you're already aware, you've wandered into an area that ignites a lot of sentiment on the part of hunters, their guns. Which is one reason I don't tend to get involved in campfire discussions about the best cartridge. Guys get personal about this, and rather opinionated far more than they should. So, unless someone is significantly and obviously undergunned, I tend to leave the issue alone.

All that said, you're article is fantastic and leaves room for individual perspective and thought. I rely on a fairly simple selection method. Can I consistently and accurately put the round where I want it on target? And, is the bullet of sufficient weight and design to do what I want it to? If the answer is yes to both, I feel I'm going to humanely harvest my animal.

Stefan Wilson
Stefan W. - posted 1 year ago on 04-25-2016 05:58:36 am
Gilbert, AZ
goHUNT INSIDER

Yes, I believe they are as accurate. Many marksmen choose 6.5mm (.260) and 7mm rounds for long-range precision. It is a matter of preference, but the .260 and the 7mm-08 are very accurate cartridges.

Warren_Lacour
Warren L. - posted 1 year ago on 04-24-2016 10:41:57 am
Shelton, CT.
goHUNT INSIDER

Do you think the 260 or 7mm08 is as accurate as the 308?