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The initial lack of AP rounds was a major drawback but as an infantry support vehicle able to fire HE it was effective.
Hey Al,
Here's an interesting aside regarding the effectiveness of the American 75mm cannon.
Hunnicutt's "Sherman - History of the American Medium Tank" notes that when the British found in early 1942 that the Grant and Lee's 75mm solid shot AP M72 rounds was less than effective against the hardened faced German armour as it usually failed at ranges over 500 yards.
The Americans were developing an improved AP capped round M61 but it wasn't readily available yet in the Middle East.
Major Northy, an Australian officer assigned to RA Ordanace Corps, came up with the unique solution of using captured German ammunition as the Brits had captured 50,000 tons of assorted German ammo during the relief of Tobruk.
Northy noted that the projectile for the Panzer IV's 75mm KwK L/24 could be adapted to fit the American M3's 75mm cartridge case.
After conferring with an American ordance officer, Major Jarrett, they decided to take apart the German and U.S. ammo, lathed down the drive bands on the German projectile to fit the American shell cases and then reassemble the new round.
The cartridge cases for the M72 and HE Mk. I rounds were used but the propellant charge weights varied.
They simply dumped all the propellant charges together, mixed, and reweighed them and reassembled the new rounds
The new rounds were designated 75mm AP-Composite by the Middle East HQ and were tested along with a few M61 that had arrived in Cairo.
Both rounds were tested against a Panzer III hull and while both penetrated it at 1000 yards, the converted round exploded inside and would have set off it's stowed ammunition.
Of the 17,000 KwK rounds converted, 15,000 were APCBC and 2,000 were HE and smoke.
Oddly enough, tthe Germans captured some 6000 of the rounds at Capruzzo when the Brits retreated from Alamein and they were re-recaptured during the liberation of Tobruk in November.
Cheers
jjumbo