Weatherby uses inch rather than SAAMI-standard inch barrels to establish nominal muzzle velocities. Then in , in an effort to continue to capitalize on the short magnum phenomenon, Winchester introduced an 8mm version.
But because this metric caliber never really caught on here, they called it the. Anxious to capitalize on the excitement surrounding its WSM series, and betting on that trend to continue, Winchester took the short magnum concept to the extreme with the introduction of its.
Ruger commissioned Hornady to develop a series of cartridges they could call their own. The result was the debut of the. Both the Winchester and Remington shorts are based on the same basic case with a head diameter of.
It is unique among non-proprietary commercial cartridges in that it does not step down to form a belt, but continues forward at that. The result is a case body that averages. Both Remington and Federal load for it, as well as the. I also think the. The RCMs are based on a unique case that is proving popular with wildcatters, and that tends to contribute to success.
Secondly, using propriety loading techniques and propellants, Hornady, the sole source of loaded ammunition, is able to match the ballistic performance of the larger-case WSM, and do it with less powder. I see no reason for anyone owning a. As for the. It does, however, occupy a unique niche in the cartridge lineup. They do represent a step forward, if only a small one, and I refuse to be left behind! Subscribe today to have GunHunter delivered to your home. Buckmasters entertains and educates deer hunters with current strategies and technology from the most respected experts in the field.
Email Sign-Up. Search Register. Ask the Biologist. Buckmasters On TV. In The Kitchen. Dinner Diaries. Find a BTR Scorer. Disabled Hunters. Advertise With Us. About Buckmasters. It fits actions designed for length cartridges. The WSM is a rebated rim, short-action round that fits length rifle actions. It gets the necessary powder volume to make up for its shorter length via the fatter diameter body of its non-belted, Jeffery-based parent case.
Furthermore, I doubt any game struck fairly with either bullet will know the difference. Why, then, the magnums? This might not make a significant difference on a deer or elk shot broadside behind the shoulders, but it could make a significantly harder impression on a wounded moose or eland running straight away or a ticked off grizzly running straight at you.
The other reason for magnum velocity is reach. But if you prefer to set up for the versatile Maximum Point Blank Range system for quick targeting at unknown distances, the flatter trajectories of caliber bullets at magnum velocities really pays off. That covers the majority of most hunting shots. Now, if you take this same bullet down to the 2, fps MV of the Win. But why two of them? Well, some magnum shooters like a long-action rifle with inch barrel, but others appreciate a short-action rifle.
However, their. Additionally, the Winchester Short Magnum Cartridges all have a case with very minimal taper and a 35 degree shoulder. Taken together, these factors all maximize the case capacity of the WSM cartridges, even though their overall length of 2. In theory, this results in improved accuracy for the shorter case. Now, the Winchester Short Magnum cartridges were not the first commercially produced short magnums.
Indeed, the 6. However, Winchester made a big splash with the. They rounded out the lineup with the Winchester Short Magnum in The first three cartridges were all designed and marketed specifically as short action alternatives to extremely popular and effective standard length cartridges: the. For that reason, the. Scroll down or click the appropriate link below to jump to the specific comparison you want to learn more about. However, Winchester did produce several versions of their Model 70 chambered in the cartridge for many years.
The differences in external dimensions between the. First, the. This makes sense since the WSM is specifically designed to fit in a short action rifle instead of a standard length action like the.
However, the WSM has a very fat case with minimal taper and a much steeper shoulder angle 35 degrees vs Additionally, while neither cartridge has a belt, the. Second, both cartridges use the same. When you consider the fact that the WSM has significantly more case capacity than the older. This is illustrated in the table below comparing Federal Premium factory ammunition loaded with gr Trophy Bonded Tip.
As you can see, since the loads for each cartridge used the exact same bullet and since the WSM had a slight advantage about fps in velocity it has a slightly flatter trajectory than the. The chart below compares how much a 10 mile per hour crosswind impacts those same four loads out to yards. Once again, the WSM has a slight advantage over the.
The table below compares the recoil produced by two Nosler hand loads available here and here with ballistics roughly comparable to the gr loads above for those cartridges when fired from a Winchester Model 70 Featherweight rifle. This specific model weighs 7. Felt recoil will vary from shooter to shooter and rifle to rifle, but free recoil energy is still a useful way to compare cartridges.
As you can see, the two cartridges have almost identical amounts of recoil with the WSM in this particular example actually having a tiny bit less free recoil energy than the. However, the WSM uses a heavier rifle and the. This is not a hard and fast rule, but it is a common occurrence with these two particular cartridges. However, regardless of the firearm in question, rifles chambered in. For example, round magazines are pretty common with the.
In that same vein, those fat, stubby WSM cartridges with their very steep shoulder angle can sometimes present feeding problems. What about accuracy of the Winchester vs WSM? After all, fans of the Winchester Short Magnum cartridges like to point out the benefits of the shorter and fatter powder column.
The Winchester Short Magnum very likely does gain some accuracy benefit from its shorter powder column. However, there are many, many other factors that influence accuracy more than that one trait.
Does the difference between the two cartridges in terms of accuracy make a difference for most hunters under typical conditions? Again, probably not. The answers to the above questions really depend on the rifle, ammunition, and shooter in question though. However, both cartridges are capable of excellent accuracy in the right hands and will get the job done under most circumstances if the shooter is up to the task.
The WSM is by no means rare though and most sporting goods stores carry ammunition for both cartridges.
Both cartridges are also well suited for hand loaders and reloading components for the. Due to the long running popularity of the. The same goes for guns: rifles chambered in. The WSM does indeed have a flatter trajectory and more resistance to wind drift than the. It also carries a tad more energy out to longer range and is capable of excellent accuracy. That extra velocity makes a bit of a difference in terms of wind drift and overall trajectory to be sure, but that slightly flatter trajectory is less important in this day and age of laser rangefinders, particularly if you have a scope equipped with a bullet drop compensating dial.
Basically, the. Both will work exceptionally well on deer sized game out to several hundred yards. Both are wonderful for situations like hunting mule deer in Arizona or pronghorn in Wyoming. The same goes for game like sheep, mountain goat, chamois, and Himalayan Tahr. You can even use them both on larger game like kudu, eland, red stag, elk, and moose with great results. The generally better feeding and overall reliability of most. The verdict?
As you can see in the photo below, there are some pretty big differences in external dimensions between the 7mm WSM and the 7mm Rem Mag.
First, the 7mm Remington Magnum cartridge is significantly longer. This makes sense since the 7mm WSM is specifically designed to fit in a short action rifle instead of a standard length action like the 7mm Rem Mag.
However, even though the 7mm Mag is derived from the. Even though the 7mm WSM uses a larger diameter case, the 7mm Rem Mag uses a relatively large diameter case itself and is significantly longer. For those reasons, the two cartridges have very similar case capacity, but the 7mm Rem Mag can hold a tiny bit more powder than the 7mm WSM. Additionally, the 7mm Remington Magnum is a traditional belted magnum while the 7mm WSM has a rebated rim and no belt.
Finally, while the two cartridges use the same 7mm bullets. For instance, the vast majority of 7mm Rem Mag factory loads shoot bullets in the grain range. Of these, grain, grain, grain, and grain loads are by far the most common. On the other hand, the majority of 7mm WSM factory loads use bullets in the grain range and , , and gr bullets are pretty common.
Factory loads for the 7mm WSM and 7mm Rem Mag often use the exact same bullets fired at virtually the same muzzle velocity. As you can probably guess, there is very little difference in the trajectories in the two cartridges.
This is illustrated in the table below comparing Federal Premium and Hornady factory ammunition loaded with gr Trophy Bonded Tip. With these loads, the bullet from the 7mm WSM is going feet per second faster than the bullet from the 7mm Rem Mag. This is an incredibly small practical difference. So, while the 7mm WSM is faster on paper, the two cartridges have essentially the same velocity for all intents and purposes.
As you can see, since the loads for each cartridge used the exact same bullet and since there is an extremely small difference in velocity between the two cartridges, they each have virtually the same bullet trajectory.
As you can see, the two cartridges have almost identical amounts of recoil with the 7mm Rem Mag in this particular example actually having a tiny bit less free recoil energy than the 7mm WSM.
Once again, there is essentially no difference between the recoil of the two cartridges though. Just like with the WSM, this is due to the very large diameter of the 7mm WSM cases that simply take up more space in a rifle magazine than the thinner 7mm Rem Mag case. In that same vein, those fat, stubby 7mm WSM cartridges with their very steep shoulder angle can sometimes present feeding problems.
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