Can You Shoot .308 Out of a 7.62x51? Understanding Cartridge Compatibility
The short answer is: generally no, you should not shoot .308 Winchester ammunition out of a rifle chambered in 7.62x51 NATO. While the cartridges appear similar and share a similar projectile diameter, there are crucial differences that can lead to dangerous consequences.
Key Differences Between .308 Winchester and 7.62x51 NATO
Although both cartridges fire a .308 inch diameter bullet, their case dimensions are different. The 7.62x51 NATO case is slightly larger and has a different shoulder angle. This seemingly small difference can have significant repercussions:
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Chamber Pressure: 7.62x51 NATO cartridges are designed to operate at higher chamber pressures than .308 Winchester. Firing a .308 round in a 7.62x51 chamber might result in the round being loosely seated, causing dangerous pressure build-up. This could lead to catastrophic rifle failure, resulting in injury or death.
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Case Head Dimensions: The case head—the base of the cartridge—of the 7.62x51 NATO is slightly larger. While a .308 cartridge might fit into a 7.62x51 chamber, it may not be fully supported. The lack of proper support could cause the case to bulge or rupture under the pressure of firing, leading to a malfunction, damage to the rifle, and potential harm to the shooter.
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Headspace: Headspace is the crucial distance between the bolt face and the cartridge case head. Differences in headspace between the two cartridges can cause a misalignment that makes safe firing impossible.
Why the Confusion?
The similar bullet diameter and overall appearance of the two cartridges frequently lead to confusion. However, it's crucial to remember that subtle differences in dimensions can have profound effects on firearm safety. Always carefully match ammunition to the chamber specifications of your firearm.
Safe Practices: Always Check Your Cartridge and Chamber Markings
Before firing any firearm, confirm that the ammunition you're using is compatible with the chamber of your firearm. The caliber should be clearly marked on both the firearm and the ammunition packaging. Never rely on visual similarities alone. If you're unsure, seek guidance from a qualified firearms expert. Improper ammunition usage can lead to serious injury or death.
Conclusion
While the calibers are close, mixing .308 Winchester and 7.62x51 NATO ammunition is extremely dangerous and should never be attempted. Always prioritize firearm safety and adhere to manufacturer's recommendations for compatible ammunition. Your safety depends on it.
