[Josh Osborne]

Tony, can you explain this for me? In your article it is stated:

In May 1940 the Bf 109E-4 entered service with the modified MG-FFM gun, adapted to fire the new Mjnengeschoss (mine shell) ammunition which had very thin walls and a doubled capacity for high explosive (HE) and/or incendiary. As a bonus the shells were lighter, permitting a higher muzzle velocity.

I have read in other sources that the large mine shell used in the MK-108 was limited to low muzzle velocities by the thin walls of the projectile. The reason stated was that the thin wall would deform and jam in the barrel if to much propellant was used. So it seems strange that the MG-FFM would have higher muzzle velocity for the thin walled version than the regular. Am I missing something?