What Caliber to Convert to 6mm BR? A Comprehensive Guide for Precision Rifle Enthusiasts
Converting a rifle to 6mm BR offers significant advantages in terms of accuracy and long-range performance. However, the optimal starting caliber for conversion depends heavily on your existing rifle's action, barrel dimensions, and your specific goals. This guide explores various options and factors to consider for a successful 6mm BR conversion.
Understanding the 6mm BR Cartridge
The 6mm BR (6mm Bench Rest) is renowned for its exceptional accuracy and consistency, making it a popular choice for competitive benchrest shooting and long-range precision rifle applications. Its relatively small case capacity contributes to low recoil and allows for precise load development. However, this also means a higher sensitivity to powder charge variations and less forgiving reloading procedures compared to larger cartridges.
Calibers Suitable for Conversion to 6mm BR
Several parent calibers lend themselves well to conversion to 6mm BR, each with its own advantages and disadvantages:
1. 6.5x47 Lapua: This cartridge's popularity stems from its relatively easy conversion to 6mm BR, often requiring minimal re-chambering and only slight barrel modifications. The 6.5x47 Lapua's larger case volume allows for some experimentation with powder charges and bullet weights, offering more versatility than some other options. However, it might necessitate additional neck turning for optimal accuracy.
2. .260 Remington: A close relative of the 6.5x47 Lapua, the .260 Remington shares many similarities in terms of conversion ease. Generally considered slightly less expensive than the 6.5x47 Lapua, it’s an excellent option if budget is a concern. However, its slightly smaller case capacity may limit bullet weight options compared to the 6.5x47 Lapua.
3. .308 Winchester: Converting a .308 Winchester to 6mm BR is a more significant undertaking, potentially requiring a complete barrel replacement and considerable action work. While achievable, it is a more expensive and time-consuming process. However, the abundance of readily available .308 Winchester rifles on the market makes this a viable option for those who already own a .308 and are willing to invest the necessary resources.
4. 6mm Creedmoor: Although already a 6mm cartridge, converting a 6mm Creedmoor to 6mm BR isn't usually the most cost-effective approach. The 6mm Creedmoor is a longer cartridge, and the modifications would be substantial, with less overall benefit compared to converting from other calibers listed above.
Factors to Consider Before Conversion
Before committing to a conversion, carefully assess these crucial elements:
- Action Type: Different actions have varying levels of compatibility with the 6mm BR. Some actions require minimal modifications while others necessitate extensive work.
- Barrel Dimensions: The existing barrel's diameter and length will dictate whether it can be re-chambered or if a complete replacement is necessary. A qualified gunsmith can determine this.
- Budget: Conversion costs can range significantly depending on the required modifications. Factor in the cost of re-chambering, barrel work (if needed), and potential action modifications.
- Gunsmith Expertise: Finding a knowledgeable and experienced gunsmith specializing in precision rifle builds is crucial for a successful conversion.
Conclusion: Making the Right Choice
Choosing the right caliber for 6mm BR conversion depends on a careful evaluation of your existing rifle and your budget. The 6.5x47 Lapua and .260 Remington offer relatively straightforward conversions, while a .308 Winchester conversion is more involved. Consult a qualified gunsmith to determine the most feasible and cost-effective route for your specific situation. Proper planning and expert execution are key to maximizing the accuracy and performance potential of your 6mm BR conversion.
