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

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

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

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

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

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 385-63, Chapter 12, Table 12-5. Plot the firing point, target, and then establish the gun target line. August 2003

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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