![]() 559 G1 BC, 110-grain Hornady A-Tip (.604 G1 BC) and Nosler’s 115-grain RDF with a. ARC brass uses small rifle primers, and Federal Premium’s Gold Medal AR Match were used for all AR loads.ĪR test loads included Berger’s 108-grain Elite Hunter with a. Most options provided in current Hornady data are modern, clean-burning formulas, most temperature insensitive and/or including copper-erasing formulas. Powder choices include medium-burn rates used in cartridges such as the. 59-inch group with a combination of Berger’s 108-grain Elite Hunter and 29.5 grains of Power Pro 2000-MR.Since the 6mm ARC was designed to run heavy 6mm bullets – with a fast 1:7.5 twist necessary for proper stabilization – I saw no reason to dabble in lighter bullets from the AR. The CMMG Endeavor AR-15 proved capable of fine precision, including this. That, and the longer tube, resulted in average 300-fps velocity gains. Maximum pressures in the turn bolt were established at 62,000 psi. Bolt-action data was developed in a CZ-USA Model 527 with a 24-inch barrel and 1:7.5 rifling. “Gas gun” data includes 52,000 psi maximum pressures. Top velocities with 108- and 110-grian bullets reached 2,575 fps. Initial Hornady load data was developed in a Noveske N4 AR-15 with an 18-inch barrel and 1:7.5 rifling twist. Flat trajectory minimized wind drift, high sectional density to aid penetration, tame recoil allowing spotting your own shots and the potential for exceptional accuracy are all part of the ARC package. The 6mm ARC as a possible military round doesn’t interest me so much as the promise of a serious hunting round. 308 bullets provides equal wind drift and velocity retention, but at the cost of heavier recoil. 308 Winchester ballistics regarding drop and wind drift (if not delivered energy). The 6mm ARC also betters or equals AR-10-based. It even beats the 6.5 Grendel at extended yardages. It blows the doors off the 5.56 NATO/.223 Remington, providing reduced wind drift and higher retained velocity/energy at any range. In very simple terms, the 6mm ARC’s exterior ballistics exceed anything currently possible with any other AR-15 cartridge, especially at long ranges. Velocities were established from a 24-inch barrel. It could easily be argued the ARC is yet another version of the 6mm PPC (which was never SAMMI standardized) – actually a pretty fair assessment, though the fast rifling twist changes everything.ĭepending on how you look at it, Hornady’s new 6mm ARC is either a necked-down 6.5 Grendel, or yet another version of the 6mm PPC.Hornady launched the 6mm ARC with three factory loads: a 103-grain ELD-X Precision Hunter at an advertised 2,800 fps, 105-grain BTHP Hornady Black at an advertised 2,750 fps and the 108-grain ELD-Match load at a stated 2,750 fps. The cartridge was quickly accepted as a Sporting Arms and Ammunition Manufacturers’ Institute (SAAMI) standard, an excellent start to such a new cartridge. The shoulder angle was set at 30 degrees. The neck was set back, allowing more room for long-for-caliber 6mm projectiles in standard AR magazines. Department of Defense, optimizing the Grendel case to meet prescribed goals. ![]() Now, take the 6.5 Grendel case, neck it to 6mm, give firearms fast rifling to handle long-for-caliber bullets weighing from 103 to 115 grains, including ballistic coefficients (BC) equaling those 6.5 projectiles, and you have Hornady’s spanking-new 6mm Advanced Rifle Cartridge, or ARC.Īs the story goes, Hornady developed the 6mm ARC under direction from the U.S. Sierra’s 95-grain Tipped MatchKing seated over 32 grains of Power Pro 2000-MR produced this.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |