The T30 hull was essentially the same as that of the T29 except for the changes to the engine compartment necessary to accommodate a different engine. The turret also was similar to that on the T29.
Statistics of 155mm T7 Gun:
40 calibers
2 rounds/minute with two loaders
It was never provided with an AP shot as far as I can tell; but I would imagine a 95 pound HE shell would mess up any **'s day; and given the calibre of the gun, a HEAT round from it would be truly terrifying.
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Early in 1945, Ordnance undertook design studies to modify the 120mm antiaircraft gun for ** use.
On 17 May 1945, OCM 27662 recommended that two of the T30 pilot **s be armed with the 120mm gun and redesignated as the heavy ** T34. This action was approved on 31 May.