Notes from Dr. Borkosky

Something to think about (but not too long), If this is your first visit, be sure to data is obviously wrong. Eugene Stoner of ArmaLite (a division of Fairchild Industries) had been advised to produce a scaled-down version of the 7.62×51mm NATO AR-10 design. If you want a bullet for self-defence purposes, this is the bullet to go for! The first AR-15 rifles used a barrel length of 20". I regularly load AR/223 rounds so that the bullet seats 1 or 2 thousandths INTO the rifling and have never seen any signs of pressure. Base diameter

weight and description. In order to post comments, please make sure JavaScript and Cookies are enabled, and reload the page. The design of full metal jacket bullets is uniform and aerodynamic, which makes it a good choice for long range precision shooting. I am reloading .223 for a M4 Carbine. I am also contacting manufacturers for their help. However, modern ballistic tip bullets (mentioned below) provides better performance than the soft tip bullets. The bullet is approximately .224 inches (5.56 mm) in diameter, and 45 mm in length. For example the .308 Winchester has a bullet diameter of .308 inches. [4][3], Stoner contacted both Winchester and Remington about increasing the case capacity. Copyright text 2017 by The Smoking Barrel. Manufacturer(s) .045 inches Joined: Jan 28, 2004 Messages: 342 Location: ohio. I will over the next couple of months integrate this data into my website so Discussion in 'Handloading and Reloading' started by ohioshooter, Jul 12, 2009. ohioshooter Member. The rim may actually serve a number of purposes, such as providing a lip for the extractor of the gun to engage or even just to provide headspace for the cartridge. Their Mini-14 rifles have rates of 1:9. Concurrently with the SCHV project, Springfield armory was developing a 7.62 mm rifle. ““Liberty is the right to choose. When handloaded, care is taken to look for pressure signs as 5.56×45mm NATO cases may produce higher pressures with the same type of powder and bullet as compared to .223 Remington cases. Freedom is the result of the right choice.””. Rifling twist

Ballistics By The Inch .223 Remington results. The proof pressure of M197 is 70,000 psi. During a public demonstration, the round successfully penetrated the US steel helmet as required, but testing showed chamber pressures to be excessively high.

[3] This is equal to the NATO maximum service pressure guideline for the 5.56×45mm NATO cartridge. The complicated part is the actual gun, right? [19][20], It is commercially loaded with 0.224-inch (5.7 mm) diameter jacketed bullets, with weights ranging from 35 to 85 grains (2.27 to 5.8 g), with the most common loading by far being 55 gr (3.6 g). Harvey was ordered to cease all work on the SCHV to avoid any competition of resources. By observation, 5.56×45mm NATO ammunition is not as accurate as .223 Remington in many of the AR type rifles extant, even with the same bullet weight. bullets, it is not worthing measuring the length and calculating the drift When a bullet is noted as rimless, the rim on the bullet casing has exactly (or at least almost) the same diameter as the base of the bullet casing. Testing was done with a Remington 722 rifle with a 22" Apex barrel. Many AR rifle owners choose to build their own rifles, which is facilitated by a huge variety of barrels and other components. [3], In the spring of 1962, Remington submitted the specifications of the .223 Remington to the Sporting Arms and Ammunition Manufacturers' Institute (SAAMI). Reloading 223 Rem./5.56mm is mostly the usual routine. 2.26 inches (57.40mm) The plastic cap is shaped to mimic the aerodynamics of the FMJ bullet. Most chamberings only give you a.020 range though so typically I go halfway;.010 below max. The LR in .22LR refers to Long Rifle, while ACP refers to Automatic Colt Pistol. afford a box of every type of bullet to measure them, I am asking for your [12] While the cartridges are identical other than powder load, bullet weight, and chamber pressure, a significant difference is in barrel of the rifle to be used, not in the cartridge. If you have a bullet that does not have a length listed here, please measure The specification included a Remington-designed bullet and the use of IMR4475 powder, which resulted in a muzzle velocity of 3,250 ft/s and a chamber pressure of 52,000 psi.

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