300 WSM vs 300 Win Mag: The 30-Caliber Magnum Clash
300 WSM vs 300 Win Mag: Which is the best big game hunting cartridge? Both use the same 30 caliber bullets and are great for long range shooting. Is one better?
I was once perusing my local gun forum and someone posted a question, “Which is better for big game hunting in North America? 300 Win Mag or 300 WSM?” The users who answered all began debating differences in ballistics, case capacity, terminal performance, and ammo selection.
However, I’d like to pose a simpler answer: Yes!
The truth is that both rifle cartridges are more than sufficient to take down any whitetail, mule deer, feral hogs, elk, moose, caribou, or bear you set your sights on. Although there are minor differences in the ballistics of each, it’s unlikely any game animal will be able to feel the difference.
The question comes down to which type of rifle action you prefer, as a 300 Win Mag fits in a standard length or long action receiver and the 300 WSM fits in a short action.
Although the differences between the two cartridges are slight, it’s a good idea to know them so you know which 30-caliber magnum you want your new hunting rifle chambered in.
What Is the Difference Between 300 WSM and 300 Win Mag?
The 300 Winchester Magnum has been around since the 1960’s and has been a favorite for military snipers, big game hunters, and benchrest shooters alike. It is truly in contention for the title of America’s Favorite Magnum Cartridge and is the gold standard by which all belted magnum cartridges are measured.
The 300 Winchester Short Magnum (WSM) is a relative newcomer to the shooting community being released in 2001. The 300 WSM embodies the ballistic advantages of the 300 Win Mag and crams them into a short action rifle.
The result is a lighter rifle with identical barrel length and extremely similar external ballistics. Having a shorter, more maneuverable rifle can be extremely handy when elk hunting in thick brush.
Both rifle cartridges are extremely accurate and can easily achieve MOA to sub-MOA level accuracy with match grade factory loads or properly tuned handloads.
Although both cartridges are excellent for hunting or target shooting, they are not without their disadvantages.
Some detractors of the 300 WSM will point to its rebated rim, claiming that this might inhibit the ability of the bolt to push the cartridge from the magazine into the chamber. The 300 WSM’s steep 35-degree shoulders also play a part in this critique, as some forum users theorize that the sharp angle might hinder smooth feeding into the chamber.
Although I will say that feeding a 300 WSM is not as smooth as the experience with other cartridges, I’ve yet to experience a jam.
For the 300 Winchester Magnum, most of the complaints center around the useless belt on the cartridge case. As you’ll learn later in the history of the 300 Win Mag, the belted case is an artifact from the parent 375 H&H Magnum case.
Early rifles used the belt for headspacing, which caused premature case stretching and thereby reduced the lifespan of the brass. If all you shoot is factory ammo and you aren’t into reloading, this is a non-issue. However, for handloaders it’s a serious problem as it means you will have to replace your 300 Win Mag brass more frequently.
Many 300 Win Mag rifles now have their chambers reamed to headspace off the case shoulders, which eliminates premature case stretching entirely.
The last strike against the 300 Win Mag is the painfully short case neck. Some long range target shooting gurus state that the 300 Win Mag’s neck is not long enough to securely hold the projectiles and maintain concentricity. In theory, this could cause the bullet to enter the rifling off-axis and affect point of impact for long distance shots.
However, based on the lack of complaints by military snipers who routinely shoot well past 1000 yards with a 300 Win Mag, I’m guessing this critique is more an online forum talking point as opposed to a real-world issue.
In the following sections, we will analyze the 300 WSM vs 300 Win Mag in detail so you can understand the differences between these two rifle cartridges.
Cartridge Specs
When evaluating two big game hunting cartridges, it’s a good idea to analyze the cartridge specs to gain more knowledge of each.
The first, and most obvious, similarity is that both the 300 Win Mag and 300 WSM fire the same 0.308” caliber bullets. However, this is where the similarities end.
The 300 WSM is a good half inch shorter than the 300 Win Mag in terms of case length and overall length. This means that the 300 Win Mag will fit into a long action while the 300 WSM will fit in a short action.
However, the base diameter of the 300 WSM is 0.02” wider than the 300 Win Mag. The wider base allows more powder to be loaded into the considerably shorter cartridge, meaning that there is about 10% less powder capacity for the 300 WSM compared to the 300 Win Mag.
However, the 300 WSM is rated to handle 1,000 more PSI of pressure based on SAAMI specs. So how is it that a cartridge with 10% less case capacity is capable of higher muzzle velocities than the larger cartridge?
The answer is simple: Efficiency
Since the 300 WSM is a shorter, fatter cartridge, this means that the powder column will be closer to the ignition source (the primer). As such, this creates an extremely efficient powder burn that leaves very little (if any) unburnt powder in the case or barrel. The 35-degree case shoulder also aids in a clean powder burn.
The 300 Win Mag is not an inefficient cartridge, the 300 WSM just does it a little bit better. With all of this in mind, let’s see how it affects the external ballistics of both cartridges.
Recoil
Recoil is the energy directed towards the shooter when a cartridge is fired from a firearm. For experienced hunters or marksmen, recoil will be a non-issue. However, for less experienced shooters or those who are recoil sensitive, less felt recoil will be preferred.
Lower recoil will also allow shooters to get their sights back on target quicker for follow-up shots. In contrast, heavy recoil can cause shooters to flinch before they pull the trigger, and during long-range shooting sessions, shoulder fatigue can become an issue.
The 300 Winchester Magnum is well known for having stout recoil, and many shooters will opt for a good recoil pad or muzzle brake to make shooting the 300 Win Mag more enjoyable. But how does it compare to the 300 Winchester Short Magnum?
The 300 WSM will fire the same bullet weights as the 300 Win Mag, so the only factor that will play a role in recoil is the powder charge being used. As the 300 Win Mag has about 10% more case capacity, it will have more felt recoil on average than the 300 WSM.
However, the difference is only slight as the average recoil for the 300 Win Mag clocks in at 28 ft-lbs of shoulder punishment while the 300 WSM has on average 25 ft-lbs of recoil energy. Just like case capacity, there is about a 10% decrease in felt recoil when you switch from 300 Win Mag to the 300 WSM.
To be honest, 3 ft-lbs difference is not all that much. It’s nothing like the difference between 308 Winchester and 223 Remington! But it’s also not nothing either.
If a shooter is recoil sensitive, then the 300 WSM is the better choice as it has less recoil than the 300 Win Mag.
Trajectory
Trajectory is how we quantify a bullet’s flight path as it travels downrange measured in inches of bullet drop.
Obviously, a flatter shooting cartridge is preferred for shooting longer ranges, as a shooter will require fewer adjustments to their optics to compensate for bullet drop. Having a flatter trajectory also means that a cartridge will be more forgiving of ranging mistakes.
For this comparison, we will consider the 180 grain bullets from the Nosler Accubond line, as this is an extremely popular hunting round.
Looking at the ballistics tables below, you’ll note that the bullet drop for 300 Win Short Mag at 400 yards is -17.2” while the 300 Win Mag has dropped -18.5”. Using the Hornady ballistic calculator to extrapolate to a 1000-yard shot, the 300 WSM is at -287.1” and 300 Win Mag has experienced -298.7” of bullet drop.
The slightly faster 300 WSM traveling at a muzzle velocity of 3,010 FPS will reach the target just a little faster than the 300 Win Mag traveling at 2,960 FPS and this is the reason for the small discrepancy in trajectory.
Benchrest shooters might be able to tell the difference at 1,000 yards, but the vast majority of shooters will have a hard time detecting any difference in trajectory between the two (especially at normal hunting distances).
Ballistic Coefficient
Ballistic coefficient (BC) is a measure of how well a bullet resists wind drift and air resistance. Put another way, it’s a numeric representation of how aerodynamic a bullet is. A high BC is preferred as this means the bullet will buck the wind easier.
Generally, heavier bullets will have a higher BC as it takes more force to disrupt the flight of a heavier bullet than a lighter one. Ballistic coefficient varies from bullet to bullet based on design, weight, and other factors that are beyond the scope of this article.
As the 300 Win Mag and the 300 WSM fire the exact same caliber bullets, they will have identical SD’s provided the factory loads are similar between the two.
Sectional Density
Sectional Density (SD) is the measure of how well a bullet penetrates a target. This is extremely important when hunting big game, as you need a bullet that can punch through thick hide, bone, and sinew.
Sectional density is calculated by comparing the bullet weight and the bullet diameter. The higher the SD the deeper the bullet will penetrate into the target. This is a simplified view of penetration as there are other factors to consider, such as bullet expansion and velocity.
As the 300 Win Mag and 300 WSM are neck-and-neck when it comes to velocity, there is little to no detectable difference in penetration between the two rounds provided the same bullet is being fired from each.
Hunting
This is the question that gets asked most frequently in hunting forums and at gun store counters: Which is better for hunting big game? 300 WSM or 300 Win Mag?
Although I’d like to share with you some super-secret ballistic data that clearly shows one cartridge is superior to the other, sadly I can’t, because they are essentially identical.
The only caveat I have to this statement is that there is a wider range of factory ammo available for 300 Win Mag due to its longer time on the market. This gives you more options to find the type of ammo your rifle really likes the best, whereas with 300 WSM you have fewer options to choose from.
Other than this, there is little difference between 300 Winchester Magnum and the 300 WSM, so shoot whichever you like best and know that you have more than enough cartridge to go elk hunting or to head into bear country.
Ammo and Rifle Cost/Availability
As mentioned in the previous section, the 300 Win Mag has a greater breadth and depth of ammo varieties due to its age. For example, Federal Premium has over 20 different varieties of 300 Win Mag ammo listed on their website alone! All of the other major manufacturers like Hornady, Nosler, Barnes, and Berger and Federal also have extensive offerings for 300 Win Mag.
This is not to suggest that you will feel constricted in terms of factory ammo for 300 Win Short Mag, quite the contrary. There are plenty of options and bullet weights available for 300 WSM. However, the are about 2x more options for 300 Win Mag compared to 300 WSM.
In terms of ammo cost, as the 300 Win Mag will be lower as it is more widely used and is also a military and police cartridge.
Generally, 300 Win Mag ammo can run as low as $2/round for cheap FMJ practice ammo and about $4-5/round for the high-quality hunting factory loads.
For 300 Win Short Mag, the cheapest ammo I could find ran about $2.50/round for practice ammo and $5+ for hunting ammo.
The difference in price is not to the point that it would inhibit most shooters from picking the 300 WSM, but the widespread popularity of the 300 Win Mag has had a positive effect on the price (for the consumer).
For rifles, most offerings you’ll find from Remington, Ruger, Savage, and Sako will be the bolt action variety. However, if you want a semi-auto rifle, then the Browning BAR is your main option currently.
As far as cost is concerned, there will be virtually zero difference in price between a 300 WSM and 300 Win Mag when purchasing a new rifle.
The only major difference between 300 Win Mag and 300 WSM rifles will be their overall length.
As the 300 WSM requires a short action, it will typically be about a 1-1.5” shorter than a 300 Win Mag rifle. Both rifles utilize a 24 inch barrel, but since the 300 WSM uses a short action, it makes for a shorter overall rifle length.
Continue reading more about 300 WSM vs 300 Win Mag: The 30-Caliber Magnum Clash.