<p>Diagram of British 3 inch <a href="https://en.wikipedia.org/wiki/Case-shot" class="extiw" title="en:Case-shot">Case Shot</a>, Mk V. 1914.
<br>For use with the following guns :-
<br></p>
<ul><li><a href="https://en.wikipedia.org/wiki/Ordnance_BL_15_pounder" class="extiw" title="en:Ordnance BL 15 pounder">BL 15 pounder</a></li>
<li><a href="https://en.wikipedia.org/wiki/Ordnance_BLC_15_pounder" class="extiw" title="en:Ordnance BLC 15 pounder">BLC 15 pounder</a></li>
<li><a href="https://en.wikipedia.org/wiki/Ordnance_QF_15_pounder" class="extiw" title="en:Ordnance QF 15 pounder">QF 15 pounder</a></li>
<li><a href="https://en.wikipedia.org/wiki/Ordnance_BL_12_pounder_6_cwt" class="extiw" title="en:Ordnance BL 12 pounder 6 cwt">BL 12 pounder 6 cwt</a></li>
<li><a href="https://en.wikipedia.org/wiki/Ordnance_QF_12_pounder_8_cwt" class="extiw" title="en:Ordnance QF 12 pounder 8 cwt">QF 12 pounder 8 cwt</a></li></ul><p>The copper band around the base is to seal the bore on firing, but does not impart spin, which would cause too great a lateral dispersion of the balls.
<br>On firing, gas issues through the hole in the base causing the body to break away from the base and causes the bullets to be released from the body before it has left the barrel.
<br>Effective up to 300 yards.</p>
War Office, UK.
1915. Facsimile reprint published by Imperial War Museum and Naval &amp; Military Press, 2003.
Plate XLI &amp; Page 226-227 in "Treatise on Ammunition" 10th Edition, 1915.