High Quality Content by WIKIPEDIA articles! The QF 6 inch 40 calibre naval gun was used by many United Kingdom-built warships around the end of the 19th century and start of the 20th century. In UK service it was known as the QF 6 inch MK I, II, III guns. As the Type 41 6-inch (152 mm)/40-caliber naval gun it was used for pre-dreadnought battleships and armoured cruisers of the early Imperial Japanese Navy built in UK shipyards. These guns were developed to exploit the new Quick-Firing technology, which involved loading the propellant charge in a brass case with primer in its base. The brass case also sealed the breech, allowing a lighter mechanism. This was presumed to allow a faster rate of fire than the older "Breech Loading" system, where the propellant was loaded in cloth bags and then a separate friction or percussion tube fitted into the breech for firing. The QF principle had proved successful with the much smaller QF 3 pounder Hotchkiss and Nordenfelt QF 3 and 6 pounders from 1885 onwards.

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