The Winchester Model 70, a legendary rifle renowned for its accuracy and robust build, offers the exciting possibility of conversion to the versatile 6mm GT cartridge. This guide delves into the process, considerations, and potential challenges involved in this conversion, empowering you to make an informed decision.
Why Convert to 6mm GT?
The 6mm GT (6mm Gunwerks Thunderbolt) cartridge has rapidly gained popularity among long-range shooters and hunters. Its exceptional ballistic performance, flatter trajectory, and less wind drift compared to many other calibers make it an attractive option for upgrading your Model 70. Its capabilities extend to hunting a wide variety of game, from varmints to larger big game, depending on bullet selection and appropriate shot placement.
Feasibility and Considerations
Converting a Winchester Model 70 to 6mm GT is achievable but requires careful planning and potentially professional gunsmithing services. Several key factors determine feasibility:
1. Barrel Replacement: The Core of the Conversion
This is the most significant aspect of the conversion. You will need a new barrel chambered in 6mm GT. Finding a pre-fit barrel specifically for your Model 70 action is ideal, simplifying the process. However, you might need a custom barrel made to your specifications, potentially impacting the overall cost.
2. Magazine Compatibility
The 6mm GT cartridge's dimensions might necessitate a new magazine. Standard Model 70 magazines likely won't accommodate the 6mm GT round. You'll need to source a magazine specifically designed for the 6mm GT or have one custom-made.
3. Action Compatibility
While the Model 70 action is robust, ensure it's compatible with the higher pressures generated by the 6mm GT cartridge. This is especially critical for older Model 70s. Consulting a qualified gunsmith is paramount to assess the action's suitability for the conversion.
4. Bolt Face Modification (Potentially)
Depending on the specific Model 70 and the manufacturer of your new barrel, a slight modification to the bolt face might be required to ensure proper headspacing. This is a job best left to a competent gunsmith.
The Conversion Process: A Step-by-Step Overview
While the specific steps will vary depending on the gunsmith and the components used, the general process usually includes:
- Disassembly: The rifle is carefully disassembled by a gunsmith.
- Barrel Removal: The existing barrel is removed, taking care to preserve the action's integrity.
- New Barrel Installation: The 6mm GT barrel is carefully installed and headspaced.
- Magazine Fitting: The new magazine is fitted and tested for functionality.
- Headspace Check: A crucial step to ensure the cartridge headspaces correctly to prevent dangerous malfunctions.
- Reassembly and Testing: The rifle is reassembled, thoroughly inspected, and test-fired to verify accuracy and functionality.
Cost Considerations
Converting your Winchester Model 70 to 6mm GT is not a cheap undertaking. The costs will include:
- Barrel: The price of a new barrel will depend on whether you opt for a pre-fit or custom-made option, and the manufacturer.
- Magazine: The cost of a 6mm GT magazine, whether pre-made or custom, needs to be factored in.
- Gunsmithing Labor: This is often the most substantial expense, encompassing the disassembly, barrel installation, headspacing, and reassembly.
Finding a Qualified Gunsmith
Choosing a reputable and experienced gunsmith is crucial for a successful conversion. Look for a gunsmith with proven experience working on Winchester Model 70 rifles and familiarity with the 6mm GT cartridge. Seek recommendations from other shooters or check online reviews before making your choice.
Conclusion
Converting a Winchester Model 70 to 6mm GT is a significant undertaking that requires careful consideration and skilled gunsmithing. While it offers the advantage of upgrading to a highly capable cartridge, the costs and potential complexities necessitate a thorough understanding of the process and a commitment to working with a professional. Prioritize safety and precision throughout the entire process to ensure your upgraded rifle remains a reliable and accurate tool.
