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**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

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**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

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**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

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

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**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

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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

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**Establish the gun target line.**

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

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**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

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**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

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**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

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**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

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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

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**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

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**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

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**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

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**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

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**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

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**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

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**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

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**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

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**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

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**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

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**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

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