When it comes to the world of firearms and ammunition, there are countless options available, each with its unique features and capabilities. Two popular choices among hunting and shooting enthusiasts are the 7mm Weatherby and the 7mm RUM (Remington Ultra Magnum). These cartridges share similarities in terms of case capacity, but they have distinct differences in chamber design and overall performance.
Case Capacity
Both the 7mm Weatherby and the 7mm RUM offer impressive case capacities. This capacity determines the amount of propellant the cartridge can hold, directly impacting its velocity and energy. In this aspect, the 7mm Weatherby and the 7mm RUM stand on equal ground, as their case capacities are quite similar.
Chamber Design
Where these cartridges truly differ is in their chamber design. The Weatherby rifle chamber employs a long free bore, meaning there is a significant distance between the cartridge case mouth and the rifling of the barrel. This design choice allows for increased velocity and potential accuracy, as the bullet has more room to accelerate before engaging the rifling.
In contrast, the 7mm RUM features a chamber design that is quite the opposite. It is known for having a shorter free bore and a tighter throat, which can sometimes restrict and grip the bullet more closely. This design choice can contribute to increased pressure and potentially higher bullet velocity, but it may also limit the overall versatility and accuracy of the cartridge.
Performance
Regarding performance, both the 7mm Weatherby and the 7mm RUM offer impressive power and trajectory. The long-range capabilities of these cartridges make them popular choices for big game hunting and long-distance shooting. However, due to the different chamber designs, the overall performance characteristics of each cartridge can vary.
The 7mm Weatherby’s long free bore design allows for higher muzzle velocities and flat trajectories, making it ideal for long-range shots. Additionally, it exhibits excellent accuracy and bullet stability, attributed to the bullet’s smooth transition into the rifling.
On the other hand, the 7mm RUM’s tighter chamber design may provide slightly higher velocities, but it can also result in increased pressures and potentially negatively impact accuracy. While it still offers superb overall performance, it may require careful load development and meticulous bullet selection.
Ammunition Availability
Another factor to consider when comparing the 7mm Weatherby and the 7mm RUM is ammunition availability. The 7mm Remington Magnum, which shares the same case capacity as the Weatherby variant, has a broader and more accessible selection of factory ammunition, making it easier to find and purchase.
Although the availability of factory-loaded 7mm Weatherby ammunition is more limited, handloaders can still take advantage of the cartridge’s performance by developing their custom loads. This is especially beneficial for those who prefer tailoring their ammunition to specific hunting or shooting requirements.
Choosing the Right Cartridge
Ultimately, the choice between the 7mm Weatherby and the 7mm RUM comes down to personal preferences and specific shooting needs. If you seek a cartridge with a long-range capability, excellent accuracy, and a proven track record, the 7mm Weatherby is worth considering.
However, if you prioritize potentially higher velocities and are willing to carefully handload and experiment to find the optimal balance between pressure and accuracy, the 7mm RUM may be a suitable option.
As with any firearm and ammunition decision, it’s crucial to evaluate your shooting goals, intended application, budget, and available resources to make an informed choice that aligns with your needs and preferences.
