The 6.5 Grendel's parent case is the .220 Russian (5.6×39mm).
Understanding the 6.5 Grendel's Origins
The 6.5mm Grendel, renowned for its performance in AR-15 platform rifles, was developed by modifying an existing cartridge case to meet specific ballistic objectives. The concept of a "parent case" refers to the original cartridge design from which a new cartridge is derived. In the case of the 6.5 Grendel, its designers chose the .220 Russian due to its suitable dimensions for adaptation.
By widening the neck and altering the shoulder of the .220 Russian case, the 6.5 Grendel was able to accommodate 6.5mm (.264-inch) bullets. This clever modification allowed for improved external ballistics, including better long-range performance and energy delivery, compared to smaller cartridges typically used in AR-15s, while maintaining compatibility with the platform's magazine well.
The following table outlines key specifications of the 6.5mm Grendel:
| Aspect | Detail |
|---|---|
| Parent Case | .220 Russian (5.6×39mm) |
| Case Type | Rimless, bottleneck |
| Bullet Diameter | 6.71 mm (0.264 in) |
| Land Diameter | 6.50 mm (0.256 in) |
This engineering approach of utilizing an existing parent case is common in cartridge development, allowing designers to leverage proven case dimensions while optimizing for new calibers and performance characteristics.
For more detailed information on the 6.5mm Grendel, you can visit its Wikipedia page.
