1939s British army sanity options

Sanity options means not having to deal with a five foot turret ring. The Comet gun was not a sawn off 17pdr.
More abbreviating at the Breech end with a smaller cartridge case, from the 3-inch 20 cwt, in the case of the 77mm HV then.

If there was room for a slightly more powerful gun then the already extant 3-inch 12pdr series should be viable?
(12cwt-18cwt-20cwt)
 
This is for my spin-off threads, but it has some relevance here...
Revenue and Expenditure 1913-40-1.jpg
 
More abbreviating at the Breech end with a smaller cartridge case, from the 3-inch 20 cwt, in the case of the 77mm HV then.

If there was room for a slightly more powerful gun then the already extant 3-inch 12pdr series should be viable?
(12cwt-18cwt-20cwt)

The 69" ring on the M4/M36/M26 did host on the 'Super Pershing' the T15E1 90mm as well as the lower powered M3 90mm

90mmCase%20%2810%29.JPG

90mmX919mmR on left, 90X615mmR ob right.
That round was longer than the 88mm on the Tiger II, that was 88mmX822mmR

Here's the rest of common WWII Tank ammo
tankgervsuk.jpg
 

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The 69" ring on the M4/M36/M26 did host on the 'Super Pershing' the T15E1 90mm as well as the lower powered M3 90mm


90mmX919mmR on left, 90X615mmR ob right.
That round was longer than the 88mm on the Tiger II, that was 88mmX822mmR

Here's the rest of common WWII Tank ammo
The 76.2mm x 585mm round is notably absent from that array or is the M5 76mmx583mm like the 17pdr?

Tony gets the last word:
https://quarryhs.co.uk/alt WW2 tank gun.htm
 
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The 76.2mm x 585mm round is notably absent from that array or is the M5 x583mm?

Yeah, that's the 17 pdr APDS in the middle of the 2nd set

The difference was

M1 76mm 76x539R 90mm diameter

M5 3” was 76x583R 108mm diameter

17 pdr 76x583R 135mm diameter

The M3 90mm had a 130mm diameter but was a bit longer, but both had very similar amount of case capacity for powder
 
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