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IBOLC BRM1
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Gravity
Terms in this set (32)
Is all shooting the same?
All shooting is the same
4 fundamentals of marksmanship
1) Steady position
2) Breathing
3) Trigger squeeze
4) Aiming
2 key firing tasks?
1) Properly point the rifle at the target (AKA sight alignment)
2) Fire the rifle without moving it (AKA trigger control)
What is sight alignment?
The centering of the front sight, rear sight, and shooters eye
What is sight picture?
The addition of a target into properly aligned sights
When aiming where should your eye focus?
The front sight post
What is the most important thing about trigger control?
smooth!
How should your finger be placed on the trigger?
Naturally
What is follow through?
Continuing to apply the basic fundamentals of marksmanship until recoil has ceased
Four elements of a steady position
1) Support (artificial and bone)
2) Muscular relaxation
3) Natural point of aim
4) Durability
Where is the natural point of aim?
Where your position points when your body is relaxed (should be on target)
5 points of a solid position
1) Non firing hand
2) rifle butt
3) Firing hand
4) Stock Weld
5) Elbows
On an M4, which sight post adjusts elevation? One click is how much change?
Front sight post, 1 click = 1 3/4 MOA
On an M4, which sight post adjusts windage? One click is how much change?
Rear sight post, 1 click - 3/4 MOA
With a M68 CCO, one click = _______ MOA for both windage and elevation?
1/2 MOA
What are the three ballistic phases?
1) Internal
2) External
3) Terminal
Does a bullet rise after it leaves the M4?
No, never- a bullet fired from a true horizontal begins to slowly fall towards the earth immediately upon leaving the muzzle.
What two primary forces act on a bullet once it leaves the muzzle?
1) Gravity
2) Air resistance
In what three ways do we counteract gravity and air resistance?
1) Increase angle of departure (elevating the muzzle)
2) Impart spin
3) High velocities
What is your point of aim for qualification targets?
1) 50m - base
2) 100m - base
3) 150m - belt
4) 200m - belly
5) 250m - below center mass
3) 300m - center mass
What is MOA?
Minute of angle- a unit of angular measure equal to 1/60 of a degree
What is the formula for converting MOA to inch adjustments
(Distance to target) x MOA=inches
Distance in hundreds of yards
IE: (3)00yds x 1 MOA = 3 inches
What is the formula for converting inches to MOA?
Inches/(Distance to target)=MOA
Distance in hundreds of yards
IE: 3 inches/(3)00yds/ = 1 MOA
How tall/wide is the standard silhouette target?
40" tall, 20" wide
How should wind velocity be adjusted based on angle?
No value if from straight behind or in front
1/2 value if from an angle
Full value if straight from the side
Wind speed indicators (probably not need to know for the test)
0-3 mph - Hardly felt, but smoke drifts
3-5 mph - Felt lightly on the face
5-8 mph - Keeps leaves on trees in constant movement 8-12 mph - Raises dust and loose paper
12-15 mph - Causes small trees to sway
Wind formula for 5.56mm
[Range(meters) X Velocity(MPH)] / 7
=
MOA of Drift
Changing wind formula into inches of compensation for 5.56 mm
[Range(meters) X Velocity(MPH)] / 7
=
MOA of Drift
MOA of drift X Range (m) = inches
What is the maximum precision of an M4 in MOA?
3 MOA rifle, = 3in diameter at 100m, 9in at 300m
With an ACOG 1 click =____ MOA for both windage and elevation?
1/3 MOA (Internal Knob)
1/2 MOA (External Knob)
If borelighting, the borelight target must be placed at ____ meters
10m
Ranges of M4
Area: 600
Point:500
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