05-10-2019, 10:21 PM
Found this (a portion only) on wikipedia about the M24 Sniper Weapon System.
My take on it is that Maximum Effective Range as a military standard is only about accuracy. So if you want a Grendel MEF, start with an accepted standard of accuracy and you will be able to calculate or test what it's MEF is.
They were rigorously tested before being approved by Remington and the military.
A U.S. Soldier training with a M24
Accuracy: According to MIL-R-71126(AR), 3.15.7 Targeting and Accuracy, The rifle shall achieve the dispersion set forth below when fired from a Government approved machine rest. The average mean radius shall be less than or equal to the values stated below. The minimum rate of fire for conducting this test shall be three rounds per minute.[3]
Range / Average Mean Radius (AMR) — Mean Radius (MR) expresses the average distance of all the shots from the center of the shot group. AMR averages the MR of several shot groups.
200 yards (183 m): 1.3 inches
273 yards (250 m): 1.4 inches
300 yards (274 m): 1.9 inches
The radial distance from the calculated center of impact of the first target compared to the calculated center of impacts of the subsequent targets shall be less or equal to 1.086 MOA (3.3 inches @ 300 yards, 2.2 inches @ 200 yards, 2.4 inches @ 200 meters) on an average basis.
The actual rifle requirements for accuracy were .35 MOA from a machine rest and according to Major John Mende (ret.) this accuracy had to be maintained to 10,000 rounds. He stated, "Interesting side note was there was a 10,000 round requirement for the barrel to maintain the original accuracy. In fact after some 10,000 round tests we discovered the accuracy improved. A few barrels were tested past 20,000 and accuracy never went below the original accuracy requirement."[8]
Maximum effective range is given as 800 meters (875 yd), but record shots have been made with the M24 at over 1,000 meters (1,094 yd). Meanwhile, the standard optical sight has a maximum elevation adjustment of 1,000 meters (1,094 yd).
My take on it is that Maximum Effective Range as a military standard is only about accuracy. So if you want a Grendel MEF, start with an accepted standard of accuracy and you will be able to calculate or test what it's MEF is.
They were rigorously tested before being approved by Remington and the military.
A U.S. Soldier training with a M24
Accuracy: According to MIL-R-71126(AR), 3.15.7 Targeting and Accuracy, The rifle shall achieve the dispersion set forth below when fired from a Government approved machine rest. The average mean radius shall be less than or equal to the values stated below. The minimum rate of fire for conducting this test shall be three rounds per minute.[3]
Range / Average Mean Radius (AMR) — Mean Radius (MR) expresses the average distance of all the shots from the center of the shot group. AMR averages the MR of several shot groups.
200 yards (183 m): 1.3 inches
273 yards (250 m): 1.4 inches
300 yards (274 m): 1.9 inches
The radial distance from the calculated center of impact of the first target compared to the calculated center of impacts of the subsequent targets shall be less or equal to 1.086 MOA (3.3 inches @ 300 yards, 2.2 inches @ 200 yards, 2.4 inches @ 200 meters) on an average basis.
The actual rifle requirements for accuracy were .35 MOA from a machine rest and according to Major John Mende (ret.) this accuracy had to be maintained to 10,000 rounds. He stated, "Interesting side note was there was a 10,000 round requirement for the barrel to maintain the original accuracy. In fact after some 10,000 round tests we discovered the accuracy improved. A few barrels were tested past 20,000 and accuracy never went below the original accuracy requirement."[8]
Maximum effective range is given as 800 meters (875 yd), but record shots have been made with the M24 at over 1,000 meters (1,094 yd). Meanwhile, the standard optical sight has a maximum elevation adjustment of 1,000 meters (1,094 yd).