My New SPR AR15 Build
"It's still just a .22"
Just a very good one. In spite of all of the bad mouthing that it gets I saw M16s and the AR clones on the highpowre range being used as service rifles, working well out to 600 yds provided it wasn't too windy. I think that the M16A1 was upgraded to the A2 primarily as a result of the Marines wanting better long range performance, so they ended up with heavier barrels, a heavier bullet with less velocity, and the ability to penetrate a W German helmet at 800 yds. Marines have better qualification scores with the M16s than they did with the M14s or the M1s, although with more training a good M14 is a better long range weapon.
Some think that we went too small with the 5.56 and that a 6mm or thereabouts is probably ideal, but to this day the 30.06 armor piercing round is still used a standard or sorts for testing light armor or body armor. I like the 30.06, but an M16 is easier to shoot and you can acrry more ammo.
Just a very good one. In spite of all of the bad mouthing that it gets I saw M16s and the AR clones on the highpowre range being used as service rifles, working well out to 600 yds provided it wasn't too windy. I think that the M16A1 was upgraded to the A2 primarily as a result of the Marines wanting better long range performance, so they ended up with heavier barrels, a heavier bullet with less velocity, and the ability to penetrate a W German helmet at 800 yds. Marines have better qualification scores with the M16s than they did with the M14s or the M1s, although with more training a good M14 is a better long range weapon.
Some think that we went too small with the 5.56 and that a 6mm or thereabouts is probably ideal, but to this day the 30.06 armor piercing round is still used a standard or sorts for testing light armor or body armor. I like the 30.06, but an M16 is easier to shoot and you can acrry more ammo.
Of the 22 caliber rounds the 223 is the most inherently accurate. While the 220 swift and the 22-250 are great rounds they are not as accurate, or on a pararie dog shoot one can't stand to fire them as long. It didn't take them long at Camp Perry to figure out that the 308 was more accurate than thte 30-06 either.
Yup, one doesn't see the 30.06 on the range these days. But the 30.06 AP ammo is still more effective than the .308, as it defines a higher threat level for armor plate. Work better with heavier bullets on game too.
The .308 is more accurate than the 30.06 but that level of accuracy is usually only good for about 2000 to 3000 rounds before the barrel is considered shot out, usually because the accuracy with the heavier bullets drops off. It seems to be due in part to the typical 1 in 12 twist used with the .308. The 30.06 typically has a 1 in 10 twist, which produces better stability of heavier rounds for things like hunting and AP rounds.
http://www.lbainternational.com/faq.htm
9. How many attacks can HAP [Hard Armour Plate] sustain?
The NIJ evaluation procedure is a basis for evaluating performance. For example, a NIJ level 3 HAP must stop six 7.62 x 51 NATO Ball shots at no less than 5cms from each shot and no less than 7.6cms from the edge of the HAP. A target pattern permits this test to be conducted accurately. A level 4 NIJ HAP must stop one shot of 30.06 AP [armour piercing] ammunition. It is acknowledged that ballistic tests ' in laboratory' conditions differ entirely from operational demands, the buyer has the choice of changing the test procedure, by doing so the construction of the armour could change resulting in increased costs and weight.
The .308 is more accurate than the 30.06 but that level of accuracy is usually only good for about 2000 to 3000 rounds before the barrel is considered shot out, usually because the accuracy with the heavier bullets drops off. It seems to be due in part to the typical 1 in 12 twist used with the .308. The 30.06 typically has a 1 in 10 twist, which produces better stability of heavier rounds for things like hunting and AP rounds.
http://www.lbainternational.com/faq.htm
9. How many attacks can HAP [Hard Armour Plate] sustain?
The NIJ evaluation procedure is a basis for evaluating performance. For example, a NIJ level 3 HAP must stop six 7.62 x 51 NATO Ball shots at no less than 5cms from each shot and no less than 7.6cms from the edge of the HAP. A target pattern permits this test to be conducted accurately. A level 4 NIJ HAP must stop one shot of 30.06 AP [armour piercing] ammunition. It is acknowledged that ballistic tests ' in laboratory' conditions differ entirely from operational demands, the buyer has the choice of changing the test procedure, by doing so the construction of the armour could change resulting in increased costs and weight.
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