.30-378 Weatherby Magnum

Rifle cartridge .30-378 Weatherby Magnum Weatherby .30-06.jpg 200px Left, with .300 Weatherby Magnum (center) and .30-06 USA Rifle Roy Weatherby 1959 Weatherby Inc. 1996 - Current .30-.378 Magnum, .30/378 Arch, .30/378 Weatherby .378 Weatherby Magnum belted magnum .308 .337 .561 .582 .579 2.913 3.690 133 1 in 10 in mm on Large rifle magnum 63817 165 BST 3500 4488 180 BST 3420 4676 200 Partition 3160 4434 26" (660 mm) Weatherby http://www.weatherby.com/products/ammo.asp?prd_id=8 Ammo info at Weatherby 2006-12-23 https://web.archive.org/web/20061110032948/http://www.weatherby.com/products/ammo.asp?prd_id=8 2006-11-10 dead The .30-378 Weatherby Magnum is a .30 caliber, belted, bottle-necked rifle cartridge.http://www.chuckhawks.com/300super_mags.htm The .300 Super Magnums Hawks Chuck 2002 chuckhawks.com Guns and Shooting Online November 24, 2013 The cartridge was developed in response to a US Army military contract in 1959. While still unreleased to the public, the cartridge went on to set world records for accuracy including the first ten 10X in 1000 yd m benchrest shooting.Barnes Frank c. 2012 Cartridges of the World 13Ed. Iola WI F+W Media Inc. 978-1-4402-3059-2 Cartridge origin The .30-378 was originally designed by Roy Weatherby as an anti-personnel/anti-materiel military cartridge for a government contract.http://gundata.org/cartridge/68/.30-378-weatherby/ .30-378 Weatherby Ballistics gundata.org Koenig Media, LLC 24 November 2013 The cartridge was created by necking down the .378 Weatherby Magnum to accept a .308 in mm on diameter bullet. The United States Army's Redstone Arsenal requested a rifle cartridge that could develop 6000 ft/s m/s on for the effects of light bullets against armor. The .30-378 Weatherby Magnum was able to attain over 5000 ft/s m/s on. Using a slower burning and denser propellant, the .30-378 Weatherby Magnum surpassed the US Army's requirement of 6000 ft/s m/s on. However, the shooting public had to wait until 1996 for Weatherby to release the cartridge.Weatherby TRR Desert Magnum .30-378 http://www.riflemagazine.com/magazine/article.cfm?magid=81&tocid=1143 Rifle Wolfe Publishing Company 35 6 December 2003 24 November 2013 In the meantime, the .30-378 Weatherby Magnum had gone on to set world records in 1000 yd m benchrest competitions. Earl Chronister, shooting a .30-378 Weatherby Magnum shot the first ever ten shot 10X with the first nine shot to 3.125 inches and the tenth flyer for an overall group of 4.375 inches. This record stood for over 30 years. Several variations of the .30-378 Weatherby Magnum were created by custom ammunition manufacturers, known as wildcatters. Hammond rifles and H-S Precision were among the several custom gun manufacturers who chambered and built rifles long before Weatherby got around to releasing the rifle to the public. Simpson Layne .30-378 Weatherby Magnum Rifle Shooter InterMedia Outdoors Palm Coast, FL January 2011 http://www.rifleshootermag.com/2011/01/04/ammunition_rs_30378weatherby_201006/ 23 November 2012 In 1991 Shooting Times editor Layne Simpson met with Ed Weatherby, the son of Weatherby Inc. founder Roy Weatherby, and urged him to release the .30-378 Weatherby to the public as a standard chambering in the Mark V action. In 1995 Layne Simpson built a rifle chambered for the .30-378 Weatherby and developed loading data and passed the data on to Norma Precision to provide a basis for their factory loaded ammunition. Design and specification The .30-378 Weatherby Magnum utilizes the .378 Weatherby Magnum as a parent cartridge. The .378 Weatherby case was necked down to accept a .30 caliber (7.62 mm) bullet while preserving the double radii shoulder of the parent case. The resulting case held a greater volume than any previous commercial cartridge.August 2021 When the cartridge was created by Roy Weatherby in 1959 there were no commercial propellants that suited the cartridge. Even the standard slow burning powder of the time IMR4350 which was used in the Weatherby line of cartridges was too fast to take advantage of the case capacity of the .30-378 Weatherby cartridge. The result was that performance advantage that was created by the volume of the .30-378 Weatherby was minimal over the competing .300 Weatherby Magnum cartridge, which had been introduced 25 years earlier. However, when launching 30 gr g on bullets which are extremely light for caliber as the Redstone Arsenal contract specified, required the use of relatively faster propellants. However, the hunting public and target shooters used 150 gr and heavier bullets, which require slower burning powders due to the extreme overbore nature of the cartridge.August 2021 800px|.30-378 Weatherby Magnum - SAAMI compliant (2013-11-30) dimensions SAAMI compliant .30-378 Weatherby Magnum cartridge schematic: All dimensions in inches [millimeters]. SAAMI recommends a 6 groove barrel with a twist rate of 10 in mm on. The recommended bore diameter is .3005 in mm on and groove diameter is .3080 in mm on with each groove having an arc width of .118 in mm on. Performance thumb|right|250px|The .30-378 has a much larger body diameter than the .300 Weatherby Magnum. The .30-378 Weatherby Magnum is considered one of the most accurate rifle cartridges. The cartridge held the world record for accuracy at 1000 yd m for over thirty years. Given factory ammunition, Weatherby guarantees 1.5 MOA accuracy from their Weatherby Mark V action rifles and sub-MOA (.99 MOA or better) accuracy from their Range Certified line of rifles and Vanguard rifle lines. Careful handloading — checking for bullet jacket concentricity, weighing of brass and bullets, uniformity of case length and overall cartridge length, choice of components, seating of bullet can all increase the accuracy of the cartridge.August 2021 The .30-378 Weatherby Magnum is a long range cartridge. It is the most powerful - in terms of energy - .30 caliber production cartridge available.http://www.ballisticstudies.com/Knowledgebase/.30-378+Weatherby+Magnum.html .30-378 Weatherby Magnum Foster Nathan 2007 ballisticstudies.com Terminal Ballistics Research 24 November 2013 It is also the flattest-shooting .30 caliber factory ammunition available. Dependent on the ammunition chosen the cartridge has a maximum point blank range of over 400 yd m on. The cartridge retains enough energy for deer-sized game at distances over 1000 yd m on, and has enough retained energy for elk and moose-sized game at a distance of over 700 yd m on. Sporting usage The .30-378 Weatherby was designed to be a high performance hunting cartridge. When released to the public, it is intended for the hunting of all the big game species of North America, Asia and Africa, save dangerous game. Since this is a small bore caliber, hunting with the .30-378 Weatherby Magnum may commonly be limited to game less than 2000 lb kg on.August 2021 Soon after the .30-378 Weatherby was designed it was adopted by the benchrest shooting community. It became popular among the 1000 yd m shooting communities such as the Original 1,000 Yards Club of Pennsylvania and went on to shoot world records at that distance. The Thompson Long Range shooting school uses the .30-378 Weatherby due to its high accuracy and reliable performance.http://thompsonlongrange.com/ Home Thompson Long Range Thompson Long Range en-US 2016-05-10 See also List of rifle cartridges Table of handgun and rifle cartridges 7 mm caliber References External links Further reloading data at Hodgdon .30-378 Weatherby by Chuck Hawks The .300 Super Magnums by Chuck Hawks https://archive.today/20130104221401/http://www.stevespages.com/jpg/cd30378weatherby.jpg Cartridge Dimensions el at Steve's Pages Category:Pistol and rifle cartridges Category:Weatherby Magnum rifle cartridges