)

Repeat with different positions for "P" until the men all understand
the method and the reasons. Do same for 300 yards, 500 yards, and 600
yards. See Figs. 34, 35, and 36.

[Illustration: Fig. 34]

[Illustration: Fig. 35]

[Illustration: Fig. 36]

Explain that in firing no change in sights should be made until the
man is sure that his hold was good, and then change without hesitancy.

The correct use of sights and their proper adjustment can thus be
taught without firing a shot. This exercise will save much time and
work on the range.

=Elevation.= As previously explained, raising the rear sight increases
the range of the bullet and lowering it decreases the range.

The amount of change which a given amount of elevation will cause in
the point struck varies with the range and with the rifle and with the
ammunition used.

For example, generally and approximately, in order, at a range of 500
yards, to change the point struck 1 foot, the rear sight must be
changed 48 yards, while to change the point struck 1 foot at 1000
yards it must be changed 12 yards. That is to say, if you fired a shot
at 300 yards, and then with the same aim, hold and other conditions as
before, you _raised_ your rear sight 48 yards, the next shot would
strike the target 1 foot _above_ the first one, and if you _lowered_
the rear sight 48 yards, the bullet would then strike the target 1
foot _below_ the first one. If firing at 1000 yards, _raising_ the
rear sight 12 yards would cause the bullet to strike the target 1 foot
_higher_ and _lowering_ the rear sight 12 yards would cause it to
strike 1 foot _lower_.

The following table gives the approximate changes in the rear sight to
move the point struck 1 foot at ranges from 100 to 1000 yards:

+-----------------------------------+
| | Correction in elevation |
| Range | necessary to change the |
| | point struck 1 foot |
+---------+-------------------------+
| 100 | 415 |
| 200 | 185 |
| 300 | 105 |
| 400 | 70 |
| 500 | 48 |
| 600 | 35 |
| 700 | 25 |
| 800 | 20 |
| 900 | 15 |
| 1,000 | 12 |
+---------+-------------------------+

The score-books issued