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<\/a>You don’t hear “game changer” much in the world of production ammunition. But once again, Hornady Manufacturing Co. has indeed changed yet another game. If you have ever considered hunting prairie dogs with your AR-15 platform rifle but thought the cartridge slightly underpowered for 300 yard dogtown decimation shots, you can now get close to .22-250 ballistics out of your .223 Remington chambered AR. The Superformance line of ammunition from Hornady now has a Superformance Varmint line (click here<\/a> to download the PDF), and the possibilities that come from these “off the chart” new cartridges are truly amazing. <\/p>\nSuperformance is not a new line from Hornady. In larger calibers it has been out for about a year and today, along with the announcement for this new Varmint line, Hornady announced the arrival of Superformance Match, including a whole new technology for bullet jacket uniformity called AMP\u2122 (Advanced Manufacturing Process). The PDF for that one is here<\/a> and we will be testing it on proof barrels for a future blog post or GunsAmerica Magazine article, but for today I am going to stick to the specifics of the Varmint. <\/p>\n First I’d like to back up a bit and explain some basics about what limits the performance of any cartridge, whether it is your .223 AR or your 9mm Glock. When a cartridge is adopted in a production firearm a set of physical attributes are registered with an umbrella organization called SAAMI (Sporting Arms and Ammunition Manufacturers Institute). When that data is registered, it not only records the physical dimensions of the cartridge, but also the maximum pressure the case head and walls of the brass cartridge will exert on the chamber walls around them for that specific named chambering (ie. .223 Remington, .300 Savage, 9mm Parabellum). <\/p>\n That pressure specification gives firearm manufacturers a hard and fast rule as to how tough the action of any firearm needs to be if you want to print that named cartridge moniker on the barrel and sell the gun as chambered for that specific cartridge. So while it may seem like a good idea to stuff as much of the fastest burning powder into your cartridge case as you can, in the world of real firearms you can’t do that because you might and probably will create unsafe pressures in your gun. SAAMI exists so that Hornady or anyone else can make ammunition for a Remington rifle and both companies will be on the same page for physical specs and pressure levels. <\/p>\n Gun powders have what is called a “burn rate” that identifies how fast they burn once ignited by the primer. As the solid powder ignites and turns to pressurized gas, it has a pressure curve, an acceleration of pressure, which causes acceleration of the bullet. It has a buildup, a peak and a drop off. How fast they burn controls this pressure curve, which falls off completely as the bullet leaves the barrel. If you use a powder that burns too fast you waste the time that the bullet is still in the barrel and that pressure and acceleration could still be building behind it. If you use a powder that burns too slow, the bullet leaves the barrel and the rest of the unburnt powder burns outside the barrel (which is why your 2″ .357 Mag has such a huge muzzle flash). <\/p>\n That said, after decades of cartridges like the .223 Remington and .22-250 came on the scene and have been experimented with ad nausium by hand loaders with the all of the available powders, along comes Hornady with Superformance that delivers performance outside what the reloading book says is even possible. And they aren’t wildcats or anything experimental. Superformance are factory cartridges in a fancy box you can buy at your local gun shop right next to regular ammo, (don’t expect Superformance Varmint until December though), and are well within SAAMI pressure specifications. <\/p>\n It begs the question, “how did they do that?” The numbers are completely “off the chart” LITTERALLY<\/em>, meaning that they are outside the bounds that the cartridge was thought to be able to produce with commercially available powders. <\/p>\n Every hand loader has looked at the load data for all of the different gun powders and asked themselves “I wonder what would happen if I mixed half this and half that?” You can’t help but see the advantages and disadvantages that every powder has for a given cartridge and bullet combination. Everyone wishes they had the environment and ability to get that “ideal burn,” the one that squeezes every bit of acceleration for the bullet out of the powder burn before the bullet leaves the barrel. This is essentially what Hornady has done. They have found a way to keep the pressure on the back of the bullet at but below SAAMI maximum for the longest amount of time possible while the bullet is in the barrel, effectively increasing the duration of the push without increasing the peak pressure.<\/p>\n “From a palette of specifically designed propellants,” explains Steve Johnson, spokesman for Hornady. “We select the appropriate mixture to develop the EXACT burn rate required to make a particular bullet\/cartridge combination as efficient as possible.\u201d \u201cAdditionally, we created a new V-Max bullet for the 223 Remington Superformance Varmint load. It shares that same \u201cogive\u201d or nose shape as the 75 grain BTHP but only weighs 53 grains. It has a BC of .290 and when loaded to 3465 fps, as it is in Supeformance Varmint it delivers basically the same external ballistics as conventional 22-250 Remington ammunition.\u201d <\/p>\n In a small diversion for the gun nerd audience, in which I proudly count myself, Superformance was not the actual beginning of this technology. Steve explained to me that it really started as far back as the development of the Light and Heavy Mag ammunition line which dates back to the 1990\u2019s but the technology evolved to the propellants that Hornady used in 30 TC, which delivers 30-06 performance from a cartridge case smaller than the 308 Winchester, and then into the LEVERevolution ammunition, which used this propellant technology combined with cutting edge bullet design, FTX bullets, to breathe some new life to the lever action rifle market by evolving 30-30 and other traditional lever action cartridges to compete with long action bolt guns, as well as the addition of two entirely new cartridges the 308 and 338 Marlin Express. If you made it this far (or skipped down because you already knew everything above) you will most likely understand what the numbers in these charts mean. But for those who don’t, the factors we are looking at here are:<\/p>\n Compare that to the load data sheets that Hornady was kind enough to allow me to copy from their excellent reloading manual. As you can see, the values for muzzle velocity matched to bullet weight are literally off the chart. To save you some band width as this page loads I made small thumbnails of the actual pages. Click on them and they will pop out a window with the full size image. <\/p>\n![\"Hornady](\"\/blog\/wp-content\/uploads\/2010\/10\/superformance_varmint_pkg-400.jpg\")
<\/a>Hornady has taken these hard and fast rules of physics and squeezed every last bit of performance out of single given cartridge and bullet combinations. They call it Superformance, and when you look at the numbers, it really is “super-performance.” Hand loaders have been trying for years to squeeze more performance out of the .223 Remington, and the .243 Winchester, and for that matter, pretty much every cartridge we have out there. There have been “wildcat” modifications to many calibers that seemingly get more performance out of a similar but different shaped package, but wildcats aren’t within SAAMI specifications and cannot be used in a gun labeled for a standard caliber. Even worse, because wildcats don’t have a SAAMI specification, they can vary a great deal from gun to gun because there is no oversight of what the cartridge designation consists of even in terms of overall length, rim thickness, shoulder angle, or any other critical specification for production ammunition. So if you want to stay within a specific pressure tolerances for a given cartridge designation, we have to use the reloading manual. The “max load” in the reloading manual is the limit for that caliber, and that is the most performance you will get.<\/p>\nA New Technology from an Old Idea<\/h2>\n
\n An old reloading idea turned into an actual plan of action and as much creative ideas (aerodynamic plastic tip bullets in lever guns that wouldn’t set off primers in tubular magazines go figure) as the gun industry had seen since the likes of John Browning.<\/p>\nOk Show Me the Numbers!<\/h2>\n
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