1. SDZ Construction: M242 25mm Gun
Inter-service Resident Range Safety Course (Intermediate)
Version: August 2003
SDZ Construction: M242 25mm Gun
Inter-service Resident Range Safety Course (Intermediate)
SDZ Construction: M242 25mm Gun

2. M2A3 Bradley Fighting Vehicle
Inter-service Resident Range Safety Course (Intermediate)
Version: August 2003
M2A3 Bradley Fighting Vehicle
August 2003
SDZ Construction: M242 25mm Gun

3. Inter-service Resident Range Safety Course (Intermediate)
Version: August 2003
M242 25mm Gun
Marine Corps Light Armored Vehicle (LAV) with the M242 25mm gun
August 2003
SDZ Construction: M242 25mm Gun

4. 25mm Ammunition
M791 APDS-T
M792 HEI-T
M793 TP-T
M794
M910
August 2003

5. Legend for 25mm Systems Weapon: Ammo Type: Impact Media: Distance X:
Angle P:
Distance W:
Area A:
Area B:
Map Scale:
Map Sheet:
Map Series:
Map Edition:
Date:
Name:
August 2003

6. Constructing a 25mm SDZ
Construct 25mm system SDZ for the M242 25mm gun firing the M792 (HEI-T) cartridge into armor.
Dimensions of the SDZ for this weapon system are given in DA-PAM , Chapter 12, Table 12-5.
Plot the firing point, target, and then establish the gun target line.
August 2003

7. Establish the gun target line.
Plot the target.
Establish the gun target line.
Plot the firing point.
August 2003

8. From Table 12-5, find Distance X (armor).
Annotate Distance X on the legend.
Distance X
At the firing point, measure 5° with a protractor from the left and right of the gun target line. 5°
August 2003

9. This completes the Dispersion Area.
Draw tic marks as shown.
To establish the Dispersion Area, draw a straight line from the firing position through each tic mark out to Distance X.
Distance X
Dispersion
Area
This completes the Dispersion Area. 5°
August 2003

10. Lightly draw lines perpendicular to the limits of the Dispersion Area.
For the Ricochet Area, on Table 12-5, find the measurement for Distance W (armor).
Distance X
Distance W =
1373m
(ˆ 1400m)
Dispersion
Area
Lightly draw lines perpendicular to the limits of the Dispersion Area.
August 2003

11. Draw a straight line through the tic marks.
Draw tic marks at the measurement for Distance W on the lines just drawn.
Draw a straight line through the tic marks.
Distance X
Dispersion
Area
On Table 12-5, find the measure- ment for Angle P.
Angle P =
28° P
August 2003

12. At the firing point, measure 28° from the left and right limits of the Dispersion Area to establish the Ricochet Area.
Distance X
Draw tic marks.
Dispersion
Area
28° P
August 2003

13. This completes the Ricochet Area.
Draw a straight line from the firing point through each tic mark just drawn.
28° P
This completes the Ricochet Area.
Distance X
Dispersion
Area
August 2003

14. This completes the Ricochet Area.
Draw a straight line from the firing point through each tic mark just drawn.
This completes the Ricochet Area.
Distance X
Ricochet
Area
Annotate the Ricochet Area (Distance W) on the legend.
Dispersion
Area
August 2003

15. Erase unnecessary lines.
From the firing position, scribe an arc between the left and right limits of the Ricochet Area. Use Distance X as the radius.
Distance X
Ricochet
Area
Dispersion
Area
Erase unnecessary lines.
August 2003

16. Erase unnecessary lines.
From the firing position, scribe an arc between the left and right limits of the Ricochet Area. Use Distance X as the radius.
Distance X
Ricochet
Area
Dispersion
Area
Erase unnecessary lines.
On Table 12-5, find the measure- ment for Area A.
Area A =
300m
August 2003

17. Lightly draw lines perpendicular to the limits of the Ricochet Area.
Draw tic marks at the measurement for Area A.
Distance X
Ricochet
Area
Ricochet
Area
Dispersion
Area
Dispersion
Area
Draw straight lines through the tic marks just drawn.
August 2003

18. From the firing point, draw straight lines through the tic marks.
At the firing point, measure 25° from the left and right limits of the Ricochet Area.
Draw tic marks.
Distance X
Ricochet
Area
Ricochet
Area
From the firing point, draw straight lines through the tic marks.
Dispersion
Area
Dispersion
Area
25°
August 2003

19. On Table 12-5, find the measurement for Area B.
Lightly draw a line that extends the gun target line from Distance X.
Distance X
Ricochet
Area
Ricochet
Area
Dispersion
Area
Dispersion
Area
Verify that the measurement for Distance X is correct; then place a tic mark at the measurement for Area B.
25°
August 2003

20. This completes Areas A and B.
25°
From the firing point, scribe an arc from the right and left limits of Area A using the measure- ment for Area B as the radius.
Distance X
Ricochet
Area
Ricochet
Area
This completes Areas A and B.
Dispersion
Area
August 2003

21. This completes Areas A and B.
Area A
Area B
From the firing point, scribe an arc from the right and left limits of Area A using the measure- ment for Area B as the radius.
Distance X
Ricochet
Area
Ricochet
Area
This completes Areas A and B.
Dispersion
Area
Annotate Areas A and B on the legend.
To complete the SDZ, erase all unnecessary lines.
August 2003

22. This completes Areas A and B.
Area A
Area B
From the firing point, scribe an arc from the right and left limits of Area A using the measure- ment for Area B as the radius.
Distance X
Ricochet
Area
Ricochet
Area
This completes Areas A and B.
Dispersion
Area
Annotate Areas A and B on the legend.
To complete the SDZ, erase all unnecessary lines.
August 2003

23. Legend for 25mm Systems Weapon: M242 25mm Gun Ammo Type: M792 (HEI-T)
Impact Media:
Armor
Distance X:
6379m (ˆ6400m)
Angle P:
28°
Distance W:
1373m (ˆ1400m)
Area A:
300m
Area B:
400m
Map Scale:
1:50,000
Map Sheet:
Map Series:
Map Edition:
Date:
Name:
August 2003