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Performance Confusion and Some Explanations |
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==Performance==
The 6mm ARC is a medium-power cartridge comparable to the [[6.5mm Grendel]], but with better ballistics thanks to the greater muzzle velocity achieved by using lighter 6mm bullets and enough power to make use of the heavy 6mm bullets. Some have stated that it offers comparable ballistics to larger 6mm cartridges like the 6mm Creedmoor and [[.243 Winchester]], but out of a smaller cartridge, however this simply is not true when comparing muzzle velocities between them.<ref>{{cite web|url=https://www.loaddevelopment.com/6mm-creedmoor-hunt-and-competition/|title=6mm ARC vs 6mm Creedmoor|website=loaddevelopment.com}}</ref> What the 6mm ARC does offer though, is almost comparable velocities and ballistic performance, but out of a compact cartridge that has lower felt recoil and fits in the standard [[AR-15]] length actions.
In addition to the above comments, there is some confusion with regards to the 6 mm ARC performance. This is because loading data given in some manuals, the 11th Edition Hornady Reloading Manual<ref>[https://www.hornady.com/reloading/handbook Hornady 11th Edition Reloading Manual]</ref> for example, has two sets of data. One set of data is loaded to the SAAMI MAP (Maximum Average Pressure) of 52,000 PSI, which is stated to be suitable for gas-operated firearms, such as the AR-15 platform and its derivatives. The second set of data is loaded to a MAP of 62,000 PSI for use with bolt action guns, such as the [[CZ 527]]. The Hornady manual states that the second set of data should not be used in gas-guns. Due to the lower MAP, the performance of 6 mm ARC ammunition loaded to gas-gun pressures will, on average, be less than bolt action pressure when using the same barrel length. When using shorter barrels, which are common on gas-guns, the difference is even more pronounced. For example, the data for an 18" (457 mm) barrelled firearm used in the Hornady manual loading data was on average 200-300 ft/s (60-90 m/s) less than the data for the 24" (610 mm) barrelled CZ 527. An addition likely performance handicap, more so when the round is used in the AR-15 platform, will be to the maximum overall length round that can be used in the firearm's magazine. It should be noted that data given by Hornady, which is present in the ‘Ballistic performance’ area, is the essentially the same as that given in the manual for when the round is loaded to bolt-action and not gas-gun pressures.
==See also==
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