Pack, iow 75mm M1 howitzer.
That is a lot of vehicle for not a lot of gun. But the genesis of the M7 can be seen , but even comparing the M7 to the Wespe, the HMC M7 was also a lot of vehicle for the 105mm howitzer.
If the US had entered the war a year earlier then this combination may have gone to war and probably would have given a good account of itself..(invasion of France 1942 anyone?)
Meanwhile other vehicles armed with either the 75mm howitzer, or a derivative, served usefully on many fronts, from the HMC M8 to the LVT(a)5 to the lesser known HMC T30 on the M3 half track.
It was a good gun, its shell being the same as that used by the range of 75mm guns mounted on US tanks and other SP mountings, of course with a different cartridge case. But there is also the (perhaps apocryphal) story of the Marine M4 unit that ran out of ammunition for their 75mm tank guns and used M1 Howitzer ammunition in its place. Of course much lower MV but the bang on target at close range against Japanese bunkers would not have been much diminished.
What surprises me about the 75mm on the Char Bis was the thickness of the barrel, almost as if the gun itself was armoured. Perhaps as the gun was so short the thickness of the barrel was required for strength to enable the sell to be discharged at what could have been a useful MV.
Edited by DougRichards, 30 July 2019 - 2227 PM.