That M3 was on par with the 88mm L/56 wasn't it? I remember a while back reading something along the lines that they needed to make new shells because the ones they had wouldn't fair to well with panthers/tigers - I do know some of the newer shells were issued to all 20 of the super pershings, it had some very nice penetration tables, able to take on a Panther at 1000 yards and penetrate the front upper hull without any issues.
Yes, the M3 was on par with the 88 mm KwK 36 L/56 main gun which were on the stock Pershings. The Super Pershing sent to the ETO was equipped with the 90 mm/70 caliber T15E1 main gun, which had a higher muzzle velocity (3,850 ft/s compared to 2,700 ft/s for the M3) and there was a second Super Pershing that was equipped with the 90mm/70 caliber T15E2 main gun that used a two piece round.
Was reading that in the Korean War that the M26 completely outclassed the T-34/85 with its 90mm HVAP that could penetrate the front glacis armor and go completely through the T-34/85 and exit out the rear, while the Easy-8 Sherman was an equal match to the T-34/85. Only reason the M26 was withdrawn from Korea because of automotive problems encountered in the mountainous terrain became a liability problem.
ack-ack