What is the difference between .308 and 7.62x51

Mega sets Knife sets Mystery boxes. Stun guns Batons. Otf knives Autos folders Italian autos. Cane swords Katanas. Multi tools Crossbows. Shopping cart close. No products in the cart. By Waheed UK. Case Thickness Generally 7. Chamber Size and Headspace While the exterior dimensions of both cartridges are the same, the dimensions of their chambers are not.

Previous Post. The US Army Ordnance Corps has historically been notoriously difficult to convince that any sort of change is good. That round, called the T65 and based on the. There are some actual differences between. These differences include pressure, case dimensions, and chamber dimensions. The other major difference is in chamber dimensions. Guns chambered for 7. During our proprietary ReSpec process, each cartridge is individually analyzed, machined to exacting SAAMI specs, then cleaned and polished.

Please upgrade to a modern browser for the best possible experience! My Account. Welcome to Top Brass Reloading Supplies! Login Create Account. Shopping Cart. Home News. Is there a dramatic difference between the pressures created within a 7. No, and yes. While there are differences between the amounts of pressure generated by each round, the nominal difference is around 12, PSI, although in practice, that number is closer to 4, These pressure differences are almost negligible, yet they can have a significant impact in the real world for anyone who owns a 7.

Contrary to the popular urban legend, 7. While the difference may feel minimal, this means that the interior of 7. According to multiple non-scientific studies , the average. Yes, grains are an actual measurement of weight. Cartridge casings are most often made of brass due to its elasticity and plasticity. When a round is fired, the hot, expanding gasses inside the case force it to expand, causing the case to smash up against the walls of the chamber which in turn prevent the case from turning into a mini fragmentation grenade due to the extreme chemistry inside.

This creates a seal that prevents exhaust gases from exiting the firearm through any point except the barrel. Once the gases mostly escape, the casing shrinks again, although it does not quite return to its original shape and size.

Of course, this all takes place within mere fractions of a second. While the external dimensions of both 7. The 7. This results in a 7. This means that when firing a. This could have some potentially expensive consequences. Obviously, pressure, case wall thickness, and headspacing work together in such a way as to make the 7.

So, the natural question is this: can you shoot 7.