Comments by "COL BEAUSABRE" (@colbeausabre8842) on "T124E2 76mm High Velocity Antitank Gun" video.
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The 17 pounder was a 76mm (3 inch) weapon. Its size made it hard to install in tanks so the 77mm was developed (used in last Cruiser tank, the Comet ). It was actually 76mm and fired the same projectiles as the 17 pounder - but to shorten the gun, the cartridge case was shorter and wider (so it held the same amount of propellant). So you got the same performance out of a gun that was easier to install in tanks and had easier to handle ammunition
"When the Cromwell's replacement, the Comet, was at the design stage, the 75 mm HV concept was reworked to fire the same projectiles as the 17-pounder through a shortened 17-pounder barrel, but retaining the 3-inch cartridge case firing from a standard 3-inch breech.
This has the benefit of greater ease of use on tanks, many of which would not have sufficient turret space to accommodate the breech length and recoil distance of the 17-pounder. Similarly, the smaller 3" based ammunition was easier to store and handle in the tank's cramped interior.
This new gun's ammunition was not interchangeable with the 17-pounder, however, and to prevent confusion over ammunition supplies, it was renamed the 77 mm HV—the 'HV' standing for High Velocity—although it was the same 76.2 mm calibre as the 17-pounder."
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