The 45 Auto +P loads are a little over 100 fps higher in velocity than the standard loads. The 45 Auto +P is specified at a Maximum Average Pressure (MAP) of 23,000 psi as opposed to the standard load of 21,000 psi. The 9mm Luger +P load is again roughly 100 fps higher than standard loads. The 9mm Luger +P is specified at a Maximum Average Pressure (MAP) of 38,500 psi as opposed to the standard load of 35,000 psi. Most 38 special +P loads are roughly 100 fps faster than the standard load. The 38 special +P is specified at a Maximum Average Pressure (MAP) of 20,000 psi as opposed to the standard 38 special load of 17,000 psi. Sporting Arms and Ammunition Manufacturers Institute ( SAAMI) lists three performance standards for +P loads. SAAMI’s Pressure Ceiling for Modern +P Ammo Fix that before spending a bunch of money on +P or +P+ ammo, hoping that it will somehow compensate for your poor shot placement due to your mediocre skills. It does play a part, but if you suck at shooting, well, you suck. Please don’t leave this article thinking ammo fixes the human error. That means your bullet won’t drop as quickly, and you’re more likely to hit whatever you were aiming at, not below the target-you also have to be a good shot. Also, an advantage of quality +P is that the extra speed means it keeps its trajectory for a longer distance. And with more pressure, you get more speed. +P is an extra charge, meaning more pressure. So, if you’re looking for self-defense ammo, +P can be a good option. Notice I used "good" and "should." This is where the debate comes from.Īssuming you have quality +P ammunition, there should be a significant difference in power, which translates to stopping power. The benefit of good +P ammunition is that it should have more power. +P Ammunition Gives you More Speed, More Energy, More Stopping Power So, I’ll give you both sides, and you can determine if +P is for you or not. However, remember where I said there’s some debate, yup, you guessed it, the need for +P is also a debated topic among shooters. If you’re sitting there and don’t know much about +P ammunition or why you should get it, just because there’s extra pressure, this section is for you. A 10 percent increase in the velocity of a bullet results in a 21 percent increase in energy and a significant improvement in terminal performance on target. Remember that bullet energy is a function of velocity squared. In general, the penetration and expansion of a bullet will increase roughly as the energy of the bullet does. The 38 special being fired in a very short-barreled revolver is especially susceptible to this because of the lower pressure and velocity caused by the cylinder gap. 45 Auto don’t produce much more than 900 fps velocity. Handguns with short barrels chambered in. The general rule of thumb in pistol terminal ballistics is that when the velocity of the bullet drops below 900 fps, it is tough for a bullet to get much expansion and create a wound cavity that will stop the threat. The lack of space to expand is what helps to create extra pressure. If the manufacturer were instead going to make a longer cartridge, it wouldn’t be the same there wouldn’t be as much of a forceful explosion. This happens because the additional powder is packed in, that packing and extra ignitable material makes a load with higher internal pressures. That gives it more power, created by extra pressure. In the simplest terms, +P ammunition is ammo with a little extra gunpowder. Overpressure ammunition, commonly known as +P or +P+, is a special type of small arms ammunition crafted to create higher internal pressure upon firing than what is typically found in standard ammunition of its caliber. I’ll also cover some debate areas on this particular ammunition topic, so keep reading to learn more. What do the markings mean, and is there really a difference between the two and a standard load? Well, we’re going to cover a little bit of that in this blog as it pertains to +P ammo and +P+ ammo. And you might be wondering if ammunition is the same way. Today, it seems like too many manufacturers go out of their way to make their products look better than that of their competitors by slapping some exaggerated information on the packaging.
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