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...the approximate number of rounds a gun could fire before needing to be [[relined]] or replaced—was 395 shells when using AP, although if only practic

...only allowed to be fired with a special lower charge but in 1917 they were relined with A tubes as Mk I+++ which enabled them to use the standard 6 pounder am

...an their heavily-armoured sides. To increase accuracy the old barrels were relined and given modern "polygroove" rifling : 27 grooves with a twist increasing