In order to obtain ballistics that are superior to the 7.62×51mm cartridge, a weapon with a longer barrel and firing a heavier bullet is necessary. To achieve the same results from shorter length barrels, even heavier bullets are needed.
As noted above, the Grendel case is very closely related to the .220 Russian case. In general, each additional grain of bullet weight will reduce muzzle velocity by 10.8 ft/s (6.1 m/s for each gram) and each additional inch of barrel length will increase muzzle velocity by 20 ft/s (2.4 m/s for each centimeter). Specific details are available as graphs derived from Alexander Arms’ public domain load table linked below.
Army and police uses
Serbia is in process of adopting a rifle made by Zastava Arms in 6.5 grendel ammo caliber as main armament for its armed forces. The rifle, designated M17, is a derivative of the previous-issue M70 rifle. An American-manufactured rifle in 6.5mm Grendel caliber may also be adopted in armament for special forces units after it passes testing in Technical Testing Center. Three types of 6.5mm Grendel ammunition produced by Prvi Partizan Užice Serbia will be tested for use with these rifles.
The origin of the 6.5 Grendel may be traced back to the Soviet 7.62×39. This was modified for European competition, being necked down to form the 220 Russian. From here, Dr. Lou Palmisano and Ferris Pindel took the case and blew out the shoulder to create the 22 PPC and the 6mm PPC, which currently dominate bench rest competitions. In designing the 6.5 Grendel, the starting position was the PPC design, but it quickly became apparent that the caliber of the PPC was not as flexible as was needed. Early research with a wildcat 6.5 PPC also showed that the case lacked powder capacity, which, in turn, created pressure problems. The final 6.5 Grendel design draws on the PPC, but it is very much its own cartridge. The internal capacity was expanded by shifting the shoulder forward and the wall thicknesses in the neck and shoulder were increased to provide a more robust case capable of being fed within a semi-automatic rifle. Finally, the external taper of the case was adjusted for reliable feed in the magazine.
The 6.5 Grendel is challenging the status quo in military and law enforcement units around the world. First unveiled in May 2003 at the Blackwater Training facility in North Carolina, the6.5 grendel ammo out-shot the 7.62 NATO at range with half the recoil. Still supersonic at 1,200 yards, the 6.5 grendel ammo delivered superior external ballistics to the 7.62 NATO. Utter reliability, superior external and terminal ballistics than the current state of the art, outstanding accuracy in a lightweight M16/AR-15 platform it is what appears to be the pinnacle for what may be achieved in the M16/AR-15 chassis. The 6.5 Grendel is not a series of compromises, but rather the perfect marriage of mechanical function, internal, external and terminal ballistics all working in harmony.
Shooting a 123-grain Lapua Scenar with a ballistic coefficient of .547 and a muzzle velocity of 2,600 FPS delivers outstanding accuracy out to 1,200 yards. At 600 yards, tennis ball size targets are no match for this flat-shooting round. For extreme accuracy, formidable terminal ballistics and long range applications, the 6.5 Grendel from canadaammunition.com Arms is unbeatable.
Compared to the 5.56 NATO, the 6.5 Grendel, with roughly twice the lead mass, gives you the potential for twice the mass of fragments. If maximum fragmentation is coincident with maximum temporary cavity, the terminal ballistics are quite convincing, all in a package that shoots flatter with 50% less felt recoil than 7.62 NATO M80 ball.
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