Can You Shoot 7.62×51 in a.308 AR 10?
The debate about shooting 7.62x51mm (also known as.308 Winchester) in a.308 AR-10 platform has been ongoing for a while now. In this article, we’ll explore the possibility of using this caliber in your.308 AR-10 and answer the question in a definitive manner.
What is the.308 AR-10?
Before we dive into the topic, let’s clarify what a.308 AR-10 is. The.308 AR-10 is a semi-automatic rifle chambered in.308 Winchester (7.62x51mm), designed to operate with the same principles as the famous M16/AR-15 platform, but in a larger, more powerful package. It’s often referred to as a "big brother" to the AR-15, and its popularity among shooters has been growing steadily.
Can You Shoot 7.62×51 in a.308 AR 10? – The Answer
In a nutshell, yes, you can shoot 7.62x51mm in a.308 AR-10. But, before you start reeling in your.308 AR-10 and rushing to the range, let’s outline some important factors to consider.
Bolt Carriage and Extraction
One of the main concerns when shooting 7.62x51mm in a.308 AR-10 is the potential for issues with bolt carrier group (BCG) extraction. The 7.62x51mm case is slightly longer and larger in diameter than the.308 Winchester case, which can put additional stress on the extractor and bolt carrier group.
However, most modern.308 AR-10 BCGs are designed to handle the slightly larger 7.62x51mm case. As long as you’re using a quality BCG from a reputable manufacturer, you should be able to extract the cases without any issues.
Barrel Threading and Suppression
Another crucial consideration is barrel threading and suppression. The 7.62x51mm case produces more significant recoil and barrel movement than the.308 Winchester case, which can affect the accuracy of your shots. To combat this, many shooters choose to thread their barrels with a heavy contour or add a compensator to mitigate the recoil.
Rifle Components and Upgrades
To shoot 7.62x51mm in a.308 AR-10, you’ll need to ensure that all your components are compatible. Upgrading your trigger, hammer, and springs to heavier-duty units can help mitigate the added stress and pressure of firing 7.62x51mm rounds.
Additionally, you may need to adjust your gas system to compensate for the increased gas generated by the 7.62x51mm round. A high-quality gas system and gas block will help keep your rifle running smoothly and reliably.
Ammunition Options
When shooting 7.62x51mm in a.308 AR-10, you’ll need to choose the right ammunition. Look for high-quality, match-grade ammunition that’s specifically designed for the.308 Winchester/.762x51mm cartridge. Avoid using surplus or lower-quality ammo, as it may not perform optimally in your rifle.
Comparison Chart:.308 Winchester and 7.62x51mm
| Specification | .308 Winchester (7.56x51mm) | 7.62x51mm |
|---|---|---|
| Caliber | .308 | 7.62mm |
| Case Length | 51.2mm | 57.05mm |
| Case Diameter | 11.14mm | 11.43mm |
| Average Muzzle Velocity | 2,650-2,700 ft/s (810-823 m/s) | 2,700-2,800 ft/s (823-853 m/s) |
| Maximum Muzzle Energy | 2,300-2,500 ft-lbf (3,130-3,370 J) | 2,400-2,600 ft-lbf (3,260-3,535 J) |
Conclusion
In conclusion, yes, you can shoot 7.62x51mm in a.308 AR-10, but it’s crucial to understand the potential issues and considerations involved. By upgrading your components, adjusting your gas system, and using high-quality ammunition, you can enjoy the benefits of shooting this powerful caliber.
Remember, it’s always important to prioritize safety and reliability when modifying your rifle. If you’re unsure about the compatibility of 7.62x51mm in your.308 AR-10, consult with a firearms expert or manufacturer’s documentation before attempting to fire this caliber.
