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It is a less precise way to measure pressure, as the method relies on looking at how much little copper disks compress when you fire the gun.Īs things are, there is no consistent mathematical formula that equates CUP to pounds per square inch (PSI). I put it that the 50,000 number is an accurate representation of copper units of pressure or CUP. Here you must concentrate on the details. 308 ammo has a slightly higher pressure than 7.62x51mm NATO, the reality is that the brass and chambers are the issues to understand. 308 cartridge in a rifle built for 7.62x51mm NATO. The logic is, do not fire a higher pressure commercial. At a glance, it appears to be a big difference and a reason to consider it unsafe to fire. The maximum pressure numbers for the two calibers are 50,000 psi for 7.62 and 62,000 psi for. The pressure is where most people get confused when analyzing the two ammo. 308 Win rounds into military rifles designed for a maximum pressure of 50,000 psi. If this is the case, avoid putting full-power. 308 Winchester round exceeds the maximum rated pressure for the 7.62×51 ammo. 308 chambers.īut if you go the other way, you can encounter problems. As a rule, this makes the 7.62mm ammo fit into. Nobody makes a 7.62mm (NATO) ammo that is not fitting to the. It is because of the differences in maximum pressures and the chamber specs. 308 Winchester the same?”Īgain, the answer is NO. Understanding the Difference Between 7.62×51 and 308 Winchesterīefore we delve much further, I must address this often-posed question “Are the7.62×51 NATO and. There are only limited categories of comparison and this will pretty much mess things up. I will try to be void of making you read all the nuances of things like piezo transducers.
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As it may be confusing to grasp, this article will try to explain it in a way that you will not bash your brains out. Weirdly all those statements are all quite true. There is a variety of responses that often include Normally, in a typical gun saloon bar discussion, the most heated debate is asking a bunch of people about the differences between. Therefore, the basic understanding is that the military cartridge will fit and fire in currently produced. It makes a slight difference in cartridge specs between the military round and the. 308 Winchester ammunition, the pressure limit is SAAMI standardized at 62.000 psi. And it is best for operating the M14, machine guns, and other semi-auto gas guns that the military uses.Īs for the. The current specification for 7.62×51 is a pressure limit of 50,000 psi. The reason is to make the round able to operate both belt-fed machine guns and semi-automatic rifles. The 7.62×51 NATO cartridge is specific and it is built for military specifications. However, there is more than one reason for this evaluation. The straight answer to this question is yes, you can fire common 7.62X51 military ammo in any currently produced rifle chambered for. Here’s what’s available so far.As an Amazon Associate, I earn from qualifying purchases. The Savage Axis II XP will is available in a variety of calibers with barrel twist rates optimized for each chambering.
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The new Axis II rifles offering some interesting features, especially considering the price point. I shot two groups of each ammo type and averaged the results. I was testing another rifle the same day, so I was able to alternate after every three-shot group to allow the Savage Axis II XP to cool down. It’s unlikely that a rifle like this would be fired rapidly enough to heat the barrel so I didn’t want to skew results that way. With velocity worked out, I then set up fresh targets at 100 yards and fired three-shot groups which I feel is a more realistic hunting rifle test as shooting volume will be low. 308 Winchester 150-grainįederal Premium Berger Hybrid Hunter. 308 Winchester 180-grainįederal Premium Barnes TSX. Ammunitionįederal Premium Non-Typical Whitetail. As you’ll see, they are very close and in one case of the Barnes TSX, virtually identical. The table below shows the “on the box” velocity ratings and the actuals I measured.