The 7mm Remington ultra magnum was introduced in 2000. It was designed to produce ultra high velocities to meet the demand for long range hunting rifles and cartridges. Since it’s introduction it has gained a mild following among long range hunting enthusiasts, but because of a short barrel life many have moved away from it. To help optimize performance Remington engineers produced a chamber design utilizing .400 (10mm) free bore. The free bore acts as a gas expansion chamber, allowing a longer pressure curve to maximize velocity.
Due to this long free bore, bullets with shorter bearing surfaces will have a period of time where they are free of control. This causes the bullet to hit the rifling off center, resulting in poor accuracy. Some rifles are a little more forgiving producing good accuracy with 162-168 grain bullets, others need either the 175 grain SMK or 180 grain VLD in order to produce optimum accuracy. Unfortunately, neither of those are available as factory loads.
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This is because of gas erosion. This occurs at the start of the rifling. The cut leade which guides the projectile into full engagement of the bore. The barrel life can be extended if you allow it to come to ambient temperatures between shots and clean the powder residues only every 3 shots however, this is somewhat unpractical in the field. Some die hard overbore cartridge fans insist on minimal practice and field usage to extend the life of the barrel, but many competitive shooters think you are far more successful at shooting when you are using the same rifle in practice as you are in
"A Loaded Gun," is a piece by Patrick Radden Keefe, which published on February 11 and 18, 2013 on The New Yorker weekly magazine. This piece revolves around Amy Bishop, a neuroscientist working at the University of Alabama, Huntsville city. On the day of February 12, 2012, at the conference room of the Shelby Center for Science and Technology, Bishop used a 9-mm rifle killed three colleagues and wounded three others. The question is how does a person with a Doctor of Philosophy (Ph. D) from prestigious university of Harvard, with a cozy family-a husband and four children, with no criminal record turn into such a cold-blooded killer? Does Bishop's tenure ended is the main reason that leads to the crime, or because of her "gun accidents" that
Fig.1 Seventeen .223 Remington cases and the bullet impact sights on the Sherriff’s County Vehicle.
The rifle and the coveted shotgun, literally brought home the bacon. With sleek models such as the Winchester .44 in 1873, accurate targeting sights increased a hunter’s ability to take down his prey, even from large distances, often exceeding 200 yards. The other weapon of choice, the shotgun, did not boast a straight, clean shot, but had the capacity to tear anything to shreds in a single blast. A short barrel provided the advantage of a wider blast range and easier handling (Trachtman et al 50). In many battles, the shotguns were often preferred for their simplifying features.
Each shot couldn’t be more than inches from the center of the bull’s eye. At the end of these contests, 1,000 winners were enlisted in the 1st United States sharper shooters. The next generation of breechloaders, called magazine rifles, would prove ever more deadly to confederate opponents. “Guns such as Spencer and Henry repeating rifles were designed to carry preloaded magazine of seven to fifteen bullets which could be inserted into the rear of the gun. ”3
bullet shoot out. Low accuracy made it difficult to fight battles with muskets this is why the bayonet came in handy. Since it took so long for the soldiers to load the flintlock musket the enemy used this to their advantage. The bayonet gave the soldiers an extra weapon in case the enemy got to close. The flintlock was not very accurate, that why soldiers had to rely on swords.
All guns serve different purposes. Guns have been a part of American history for many years. Many different kinds of guns have been used for many different types of jobs. In like manner hunters have different guns for different game. Just as police use guns for law enforcement, hunters use guns to harvest game. The two most commonly used firearms of hunters, are the rifle and the shotgun. Both the rifle and the shotgun are used for hunting, but the two have some major differences. The main differences between the two firearms are cost, range and the type of ammunition that each firearm uses. Most gun manufactures sell shotguns much cheaper than they sell rifles. Shotguns are not as complex internally, and have fewer parts than rifles. The simplicity of a shotgun also makes them easier to clean and maintain, which cuts down on cost. Being that shotguns have fewer parts than rifles, this helps with expense also. No matter how well a hunter takes care of his gun, over time internal parts will either brake or need to be replaced. If there are fewer parts, there is less to replace and less money to spend. Rifles on the other hand, seem to cost much more than shotguns. Rifles are much more complex internally than shotguns and therefore cost more to produce. Also when hunting with rifles some type of vision enhancement is require...
Talking about the history of BB guns brings much scope for pointing out as many interesting facts related to BB guns, as possible. Therefore, it must be mentioned without fail that the first BB was actually a shotgun shot, which was sized no more than .180 i...
Well, you have your AR all dialed in and it runs through ammo without a single hiccup, however, it still needs a little something. How many magazine changes do you think you go through in a day? Wouldn’t it be great if that little something you upgrade would make those mag swaps go better? When you install a Phase 5 magazine release button those mag swaps will improve, so will you.
Jay Lefts explains that “The Heckler & Koch HK416 uses a different type of piston action as a remedy to the inherent fouling issue that the M4 Carbine carries with it’s direct impingement system” (Lefts). You may be wondering what a “fouling” issue is. The fouling issue that is being addressed by Lefts is the reoccurring
In Firearms: A Global History to 1700, Kenneth Chase investigates why Europe perfected firearms when the Chinese invented them. Kenneth Chase is an attorney at law who received his PhD in East Asian Languages and Civilizations from Harvard University. He uses primary sources in the form of texts and paintings as well as secondary sources in this monograph to trace the origin and spread of firearms. He also uses these sources to characterize militaries and determine why they used or did not use firearms. Chase dismisses the notion that the discrepancy between Eastern and Western firearms development was the result of cultural aversion. If anything, he argues that Europeans were more averse to firearms due to its association to Satan and a general
...rounds per minute, all with just the pull of the trigger. The recoil operation was a milestone in machine gun development. Warfare had truly changed. “Point a machine, and killing men was like killing bugs” (Chivers, 2010, p.85). It used new forms of cartridges which were placed on a belt that was automatically fed into the gun via the recoil operation.
People don’t realize that there are almost 20 different cartridges in both; rimfire and centerfire that contain a, .22 caliber projectile. The Rimfire include; LR, BB, CB, CAP, Long, Extra Long, Short, Rimfire, WMR and Winchester Automatic. The centerfire includes; 5.56x45mm or .223, Accelerator, Eagerspliten Loudenboomer, Hornet, Remington Jet, BR Remington, Savage HP, Spitfire, PPC and TCM.
making all the rest explode. That was Sam Colt’s first gun design he made (Peterson 209).
M253 Cannon (barrel): The M253 cannon consists of the barrel, sealed at the lower end with a removable breech plug that houses a removable firing pin. At the muzzle end is a cone-shaped Blast Attenuator Device (BAD) that is fitted to reduce noise.