USA: Early M4 hulls with L40 gun?

[jp10]

According to FM 23-95 75-MM TANK GUN M2 (MOUNTED IN MEDIUM TANK M3)
May 4, 1942, the gun was measured "Length (muzzle to rear face of breech ring)". I would imagine it would be the same for the 75-MM Tank gun mounted in Medium Tank M4.

[Cross]

Originally Posted by jp10

According to FM 23-95 75-MM TANK GUN M2 (MOUNTED IN MEDIUM TANK M3)
May 4, 1942, the gun was measured "Length (muzzle to rear face of breech ring)". I would imagine it would be the same for the 75-MM Tank gun mounted in Medium Tank M4.

It's my understanding that the rear of the breech is farthest from the loader and where the bore begins. This would appear to confirm that the L40 does refer to a bore length of 3007mm.

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[Cross]

Originally Posted by jp10

According to FM 23-95 75-MM TANK GUN M2 (MOUNTED IN MEDIUM TANK M3)
May 4, 1942, the gun was measured "Length (muzzle to rear face of breech ring)". I would imagine it would be the same for the 75-MM Tank gun mounted in Medium Tank M4.

It's my understanding that the rear of the breech is farthest from the loader and where the bore begins. This would appear to confirm that the L40 does refer to a bore length of 3007mm.

Cross

[Cross]

Originally Posted by Cross

It's my understanding that the rear of the breech is farthest from the loader and where the bore begins. This would appear to confirm that the L40 does refer to a bore length of 3007mm.

Cross

I've contradicted myself...
If the continental armies also measured from the "rear face of the breech" then the USSR and Germany also used a bore length to determine the L** calibers, and my original source is wrong.

Don't you love rivet counting


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