United States of America
Miscellaneous 6" (15.2 cm) Guns

6"/44 (15.2 cm) Mark 9
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6"/45 (15.2 cm) Mark 10
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6"/50 (15.2 cm) Mark 11
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6" (15.2 cm) Mark 13
Updated 21 September 2006
This page is a collection of miscellaneous USA 6" (15.2 cm) guns, none of which were of much importance.  As detailed information for these guns is limited, rather than creating a page for each one, I have decided to combine them into a single page.
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6"/44 (15.2 cm) Mark 9
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This was a Bethlehem RF design firing semi-fixed ammunition and intended for capital ship secondaries.  Does not appear to have entered service.  Overall length was 270 in (6.858 m), bore length was 263.3 in (6.688 m) or 43.88 calibers.  Gun weight was15,340 lbs. (6,958 kg) including the breech.  Mod 0 had 24 rifling grooves while Mod 1 had 36 grooves.  Fired a 105 lbs. (47.6 kg) shell.  With a 20 lbs. (9.1 kg) charge, muzzle velocity was 2,250 fps (686 mps), range was 19,000 yards (17,370 m) at 30.3 degrees elevation and pressure was 15 tons/in2 (2,360 kg/cm2).
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6"/45 (15.2 cm) Mark 10
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A gun built by Vickers Sons & Maxim Co., no details survive.  May have been purchased to evaluate British construction methods and gun performance.  Vickers serial number 1015a, USN serial number 523.
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6"/50 (15.2 cm) Mark 11
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WNUS_6-44_mk9_wire_pic.jpg

This appears to be the Mark 11 wire-wound Vickers gun.  The gun pictured burst after firing 45 rounds sometime around 1910.
A wire-wound gun built by Vickers Sons & Maxim Co., no details survive.  May have been purchased to evaluate British construction methods and gun performance.  Vickers serial number 1070a, USN serial number 524.
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6" (15.2 cm) Mark 13
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Depth charge gun.  Redesignated as Depth Charge Projector Mark 2 Mod 0.
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Data from
"Powder and Propellants:  Energetic Materials at Indian Head, Maryland, 1890-2001 - Second Edition" by Rodney Carlisle
"US Naval Weapons" by Norman Friedman
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"United States Naval Guns:  Their Marks and Modifications" Ordnance Pamphlet No. 127, December 1916, Second Revision June 1924
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Gene Slover's Navy Pages