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The Germans measured the O.D. of the projectile differently (actually bore I.D.) than the Soviets. One measured from the diameter of the lands, while the other went by the diameter of the grooves . . . I seriously doubt there's much difference between the two bores.

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Two statements here that need to be corrected:

> Both the Soviets and the Germans measured artillery in the same way.

> The 76.2mm Russian and 7.5cm German bores were different.

Both of these questions were resolved earlier and are apparent from manual illustrations referenced by Philipp. The bourrelet of a German 7.5cm projectile was 74.85mm in diameter and the projectile for the Russian gun was 76.1mm. The bourrelet diameter is a very close fit to the bore diameter of the tube, so the bourrelet diameter is effectively the same as the bore size.

KL

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If (as one poster has stated) the German round was much longer, it would possess a higher ballistic co-efficient.

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The round, i.e. the cartridge, was longer. The projectiles were similar.

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My guess would be that they redesigned the base of the projectile to fit the 75mm I.D. of the PAK 40 case . . . Reason why? The cases are made on an extruder, and then finished out in a die. Just going from 75mm to 76mm would have required a major tooling change.

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The documentary evidence is that the Pak40 case simply had an expanded mouth. This is not a significant change.

** Ah but that is important. The chamber and throat could not be a standard PAK 40 due to a major increase to pressure spikes.

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I also suspect that the projectiles were similar to the OEM Russian ammo, but with the bigger PAK 40 case.

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Yes, but that's because the Russian and German projectiles were very similar to begin with.

** length has little to do with my thoughts. It's the ballistic co-efficient that has to be similar.

KL

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The Germans measured the O.D. of the projectile differently (actually bore I.D.) than the Soviets. One measured from the diameter of the lands, while the other went by the diameter of the grooves . . . I seriously doubt there's much difference between the two bores.

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Two statements here that need to be corrected:

> Both the Soviets and the Germans measured artillery in the same way.

> The 76.2mm Russian and 7.5cm German bores were different.

Both of these questions were resolved earlier and are apparent from manual illustrations referenced by Philipp. The bourrelet of a German 7.5cm projectile was 74.85mm in diameter and the projectile for the Russian gun was 76.1mm. The bourrelet diameter is a very close fit to the bore diameter of the tube, so the bourrelet diameter is effectively the same as the bore size.

KL

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if you'd ever shot a cannon, you'd know that the round has to slip into the bore till the driving band seats into the rifling. There must be some clearance to get the driving band to seat. Also the rifling would be trashed after one round
gary

Probably
wont help but the AK47 could fire N.A.T.O. 7.62 but the British S.L.R could not fire the soviet rounds