gcp
01-20-2002, 07:54 AM
.....where this came from but here you go.
gcp
5.56 mm NATO (.223 Rem.) AR-15/M-16 RIFLES 5.56 mm NATO (.223 Rem.)
AR-15/M-16 RIFLES By: L. S. Barrel Studies done by the Germans in WW I and
WW II AND by the US in WW II and Korea found the following: The average
infantryman's average shot in combat seldom exceeded 90 yards. A long shot
was over 150 yards. The average sniper's average shot in combat was rarely
beyond 175 yards NOTE: In both instances the terrain and the skill of the
soldier in using cover and concealment kept the engagement distances close.
Did you know that the FBI's Hostage Rescue Team's longest "for the money"
shot, prior to Ruby Ridge, was only 77 yards? One of the reasons that the US
military adopted the .223 cartridge was that it and its rifle weigh so
little. A long time ago the military determined that the average soldier
could only carry a maximum load of 70 lbs. and still be able to function in
a combat environment. Of that 70 lbs. load, 17 lbs. were to be weapons and
ammunition. The heavier the gun, the fewer the number of rounds that could
be carried as part of a standard load. Any weight savings on the gun and
ammo combo adds up, allowing you to carry more ammo for a given amount of
weight. One of the other reasons the military adopted the .223 is that it is
a flat shooting cartridge. If your rifle is zeroed for 250 yards/meters,
then from the muzzle to 300 yds./m. the bullet will not be above or below
the line of sight by more than 2.1 inches. In other words, if your target is
less than 3 football fields away, put your sights on the target and you'll
hit it. That's nice to know but I can't find a shooting range that will let
me shoot exactly 250 yards/meters. Okay, go to your range and set up a
target at 25 yards/meters. Using 55 grain FMJ ammo (like the military),
adjust your sights so that the bullet impact AND your aiming point are the
SAME. If you're zeroed at 25 yards/meters, you're also zeroed at 250
yards/meters ! (If you zero in yards, your distance is in yards; the same is
true for zeroing in meters.) I've included a diagram of aiming points for a
full man-sized target to show where to aim to hit the target in mid-chest
with a AR-15/M-16 rifle whose sights are set for zero at 250 yards/meters
(using 55 grain FMJ ammo).
Without changing from the 250 yard sight setting, to hit mid-chest at:
0 to 300 yards/meters AIM at mid-chest
400 yards/meters AIM level with the shoulders
500 yards/meters AIM at the top of the head
-------------------------------------------------------------------
7.62 mm NATO (.308 Win.) M-14/M-1A Rifles 7.62 mm NATO (.308 Win.) M-14/M-1A
Rifles By: L. S. Barrel The M-14 rifle was developed as a product-improved,
magazine fed replacement for the M-1 Garand rifle that was used during WW II
and Korea. Like its predecessor, the M-14 has a reputation for exceptional
accuracy at distances of up to 1,000 yards. Deployed during the Vietnam
conflict, it is still in the military inventory today as a sniper and match
rifle. To zero this rifle using 147 grain FMJ ammo (like the military), set
up a target at 25 yards/meters. If your bullet impact is 1.8 inches HIGHER
than your aiming point, your rifle is now zeroed for 500 yards/meters. If
your distance to the zero target is in yards, your long range is in yards
(the same holds true for zeroing in meters). Now to set your sights for
other distances. Without moving your rear sight aperture - loosen the LEFT
screw on your elevation knob, rotate the outer scale ring to the 5 mark, and
then tighten that left screw back down snugly. Now your left (elevation)
knob is calibrated for most distances. Want to shoot and hit a target at 300
yards/meters? Put the 3 on the elevation knob beside the index line on the
receiver and shoot. You should be on the money, other than a windage
problem. I've included a diagram of aiming points for a full man-sized
target to show where to aim to hit the target in mid-chest with a rifle
whose sights are set for zero at 500 yards (using .308 MATCH ammo). NOTE:
This data was developed by the USMC Sniper School at Camp Pendleton during
the Vietnam War, using US GI Match grade M-118 7.62 mm ammo, with the 173
grain FMJBT bullet. Interestingly the currently available Federal brand 168
grain BTHP .308 GOLD MEDAL MATCH ammunition has virtually the same
performance characteristics. The MATCH ammo does shoot to a different point
of aim than the previously mentioned 147 gr. FMJ ammo (requiring a trip to
the range to shoot at a 500 yard target to get the rifle truly zeroed-in at
that distance with the match ammo). Don't despair, you can shoot the 147 gr.
FMJ ammo with the same hold-off because the lighter bullet's increased
velocity produces (to within 2 inches) the same trajectory as the match
ammo. If you've zeroed with the 147 grain ammo, shoot the 147 grain ammo.
Just don't try using the match ammo with the 147's sight settings - you'll
miss the target and be wasting your ammunition.
Without changing from the 500 yard sight setting, to hit mid-chest at:
100 or 400 yards AIM at the belt buckle
200 or 300 yards AIM 19 inches below mid-chest (about 3" below the groin)
500 yards AIM mid-chest
600 yards AIM 26 inches above mid-chest
gcp
5.56 mm NATO (.223 Rem.) AR-15/M-16 RIFLES 5.56 mm NATO (.223 Rem.)
AR-15/M-16 RIFLES By: L. S. Barrel Studies done by the Germans in WW I and
WW II AND by the US in WW II and Korea found the following: The average
infantryman's average shot in combat seldom exceeded 90 yards. A long shot
was over 150 yards. The average sniper's average shot in combat was rarely
beyond 175 yards NOTE: In both instances the terrain and the skill of the
soldier in using cover and concealment kept the engagement distances close.
Did you know that the FBI's Hostage Rescue Team's longest "for the money"
shot, prior to Ruby Ridge, was only 77 yards? One of the reasons that the US
military adopted the .223 cartridge was that it and its rifle weigh so
little. A long time ago the military determined that the average soldier
could only carry a maximum load of 70 lbs. and still be able to function in
a combat environment. Of that 70 lbs. load, 17 lbs. were to be weapons and
ammunition. The heavier the gun, the fewer the number of rounds that could
be carried as part of a standard load. Any weight savings on the gun and
ammo combo adds up, allowing you to carry more ammo for a given amount of
weight. One of the other reasons the military adopted the .223 is that it is
a flat shooting cartridge. If your rifle is zeroed for 250 yards/meters,
then from the muzzle to 300 yds./m. the bullet will not be above or below
the line of sight by more than 2.1 inches. In other words, if your target is
less than 3 football fields away, put your sights on the target and you'll
hit it. That's nice to know but I can't find a shooting range that will let
me shoot exactly 250 yards/meters. Okay, go to your range and set up a
target at 25 yards/meters. Using 55 grain FMJ ammo (like the military),
adjust your sights so that the bullet impact AND your aiming point are the
SAME. If you're zeroed at 25 yards/meters, you're also zeroed at 250
yards/meters ! (If you zero in yards, your distance is in yards; the same is
true for zeroing in meters.) I've included a diagram of aiming points for a
full man-sized target to show where to aim to hit the target in mid-chest
with a AR-15/M-16 rifle whose sights are set for zero at 250 yards/meters
(using 55 grain FMJ ammo).
Without changing from the 250 yard sight setting, to hit mid-chest at:
0 to 300 yards/meters AIM at mid-chest
400 yards/meters AIM level with the shoulders
500 yards/meters AIM at the top of the head
-------------------------------------------------------------------
7.62 mm NATO (.308 Win.) M-14/M-1A Rifles 7.62 mm NATO (.308 Win.) M-14/M-1A
Rifles By: L. S. Barrel The M-14 rifle was developed as a product-improved,
magazine fed replacement for the M-1 Garand rifle that was used during WW II
and Korea. Like its predecessor, the M-14 has a reputation for exceptional
accuracy at distances of up to 1,000 yards. Deployed during the Vietnam
conflict, it is still in the military inventory today as a sniper and match
rifle. To zero this rifle using 147 grain FMJ ammo (like the military), set
up a target at 25 yards/meters. If your bullet impact is 1.8 inches HIGHER
than your aiming point, your rifle is now zeroed for 500 yards/meters. If
your distance to the zero target is in yards, your long range is in yards
(the same holds true for zeroing in meters). Now to set your sights for
other distances. Without moving your rear sight aperture - loosen the LEFT
screw on your elevation knob, rotate the outer scale ring to the 5 mark, and
then tighten that left screw back down snugly. Now your left (elevation)
knob is calibrated for most distances. Want to shoot and hit a target at 300
yards/meters? Put the 3 on the elevation knob beside the index line on the
receiver and shoot. You should be on the money, other than a windage
problem. I've included a diagram of aiming points for a full man-sized
target to show where to aim to hit the target in mid-chest with a rifle
whose sights are set for zero at 500 yards (using .308 MATCH ammo). NOTE:
This data was developed by the USMC Sniper School at Camp Pendleton during
the Vietnam War, using US GI Match grade M-118 7.62 mm ammo, with the 173
grain FMJBT bullet. Interestingly the currently available Federal brand 168
grain BTHP .308 GOLD MEDAL MATCH ammunition has virtually the same
performance characteristics. The MATCH ammo does shoot to a different point
of aim than the previously mentioned 147 gr. FMJ ammo (requiring a trip to
the range to shoot at a 500 yard target to get the rifle truly zeroed-in at
that distance with the match ammo). Don't despair, you can shoot the 147 gr.
FMJ ammo with the same hold-off because the lighter bullet's increased
velocity produces (to within 2 inches) the same trajectory as the match
ammo. If you've zeroed with the 147 grain ammo, shoot the 147 grain ammo.
Just don't try using the match ammo with the 147's sight settings - you'll
miss the target and be wasting your ammunition.
Without changing from the 500 yard sight setting, to hit mid-chest at:
100 or 400 yards AIM at the belt buckle
200 or 300 yards AIM 19 inches below mid-chest (about 3" below the groin)
500 yards AIM mid-chest
600 yards AIM 26 inches above mid-chest