Translated to hillbilly, the bullet will cut a hole of about 1 inch in diameter for every 10 inches it travels. This applies in the barrel, in the air and inside test mediums, or bad guys. That means for every 10 inches the bullet travels it will rotate one time. You see the standard twist rate for the 9 mm is 1:10 inches. But, understand that this expansion measurement was across the front of the bullet at its widest section, and unlike common lead-core bullets the MHP opens with four petals.ĭoes it matter this bullet has petals instead of a round frontal area? Not really. In case you are decimally challenged, for all practical purposes that’s 1 inch. Penetration ranged from 10.5 to 12 inches and expansion was quite consistent, averaging. By firing 12 rounds of Norma MHP into blocks of clear ballistics I feel a reasonable assumption can be made. When it comes to terminal performance, all we can do is make an educated guess based on testing and experience. Get the right recoil spring for the job.Įven though reliability is the most-critical measure of any defensive-handgun load, terminal performance is what everyone keys on. Keep this in mind if you’re trying this ammunition. For example, a 115-grain, 9 mm +P load can generate about 5 ft.-lbs. Keep in mind, with the 108-grain MHP bullet, not only is recoil reduced, but so too is the force exerted on the slide while cycling. That particular pistol has an aluminum frame and is set up with a heavy spring to work with +P ammunition. But, these failures to eject need to be qualified. This handgun failed to eject all 13 rounds fired through it. I’ve seen two identical guns record muzzle velocities of almost 100 fps difference with identical ammunition.Īs far as reliability, there were no issues at all except with the 5-inch Wilson Combat 1911. However, velocity measurement is a fickle beast. This explains why the velocities I obtained were a bit slower than advertised. Norma advertises a muzzle velocity of 1,312 fps, obtained with a 6-inch barrel. Standard velocity deviations ranged from 5.1 fps to 15.7 fps for an average of 10 fps. With regard to velocity, the Norma MHP was quite consistent. With each handgun I fired 10 rounds to get an idea about velocity consistency, and then fired three shots into a block of Clear Ballistics to get an idea about penetration and expansion. The company sent me four boxes-80 rounds-to test, and I fired it through four different handguns with barrel lengths ranging from 3.1 to 5.0 inches. The cases have black-oxide coating, which does two things: First it gives the loaded cartridge a cool appearance, and second, it slickens the surface to aid reliability.Ĭurrently the only cartridge for which Norma is offering MHP ammo is the 9 mm. The bullets are plated and have a silver (if not almost chrome) appearance. In the case of the MHP the nose is cavitated by about 1⁄ 16th of an inch, and around the cavitation the nose of the bullet has been skived or pre-stressed. Hollowpoint refers to the configuration of the nose of the bullet. In the case of the MHP, this material is copper. Monolithic means the bullet is made from a single material. For 2019, Norma Ammunition has a new take on the defensive-handgun bullet and it’s called the MHP (Monolithic Hollow Point).įor starters, let’s get the description out of the way. This is because there are so many variables an engineer must balance. When it comes to that science-the science of terminal ballistics-trying to design a better bullet is a lot like juggling cats. We’re always looking for that better mousetrap a load that will increase the likelihood of a one-shot stop. Those who have accepted the responsibility of their own safety and live with a defensive handgun on or near them at all times continue to search for better ammunition options. Norma’s new MHP load for the 9 mm offers an easy-shooting, reliable and consistent defensive option for the cartridge.
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