Agreed but then the MG-FF should be strong aswell. Its just slower than the Hispano, but the proj. weight heavier.
And the large cartridge, will just give you more starting muzzle velocity, because the cartridge case is bigger with bigger amount of explosive what ll make the bullet faster in the cannon barrel.
Still we not calculated the high amount of explosive for the minengeschoß.
The true difference I guess will be the british ammunition. The birts used SAPI(Semi-Armor-Piercing-Incendiary) and SAP-HEI(Semi armor piercing high explosive shell.) And the SAP has more shrapnel as a Yankee said.
PS:But I still think something is not "okey" with Minengeschoß, why? http://quarryhs.co.uk/RAF guns.htm
"The Modern Era
At the end of the Second World War, there was, as usual, very little money for new armament developments and the Hispano remained in service until the mid-1950s, not just in fighters but also in the Shackleton MR plane. However the Allies did have a new gun to play with; the Mauser MG 213C.
The German firm had designed a new type of gun to meet a Luftwaffe requirement for a very fast-firing, high-velocity 20 mm cannon. This addressed the main restriction on rate of fire – ammunition handling – by breaking it down into several stages. Instead of one chamber formed as a part of the rear of the barrel, five chambers were used within a cylinder whose axis of rotation was parallel with the barrel, so that as the cylinder rotated, each chamber was brought into line with the barrel in turn, and its cartridge fired. At the same time, the other chambers were engaged with loading a fresh cartridge or ejecting a spent case. This allowed rates of fire of well over 1,000 rpm to be achieved. As this layout bore some resemblance to the traditional revolver type of handgun, it became known as the revolver cannon. During the development of the MG 213C a low-velocity 30 mm version was also produced, considered more suitable for bomber destruction. This became the focus of interest in both the UK and France, who continued the development of the gun. It took several years before the resulting Aden and DEFA guns were ready for service, but they were eventually introduced using slightly different versions of the 30 mm ammunition.
30 mm Aden gun
Further joint development saw the ammunition altered to fire a lighter shell at a higher muzzle velocity, and this became the NATO 30mm round still used by the Aden Mk 4 and DEFA 550 series guns, and by the M230 Chain Gun used on the Apache AH-64 attack helicopter in British Army service. However, the Aden, DEFA and M230 all use slightly different versions of the ammunition which are not completely interchangeable.
The 30 mm Aden Mk 4 was the standard RAF and FAA gun from the late 1950s until the 1980s, and remains in service with the Hawk trainer (the last combat aircraft to carry it being the Sea Harrier and the Jaguar). It was exceptionally hard-hitting for its day, firing shells weighing twice that of the Hispano's at an only slightly lower muzzle velocity, but at a much higher rate of about 1,300 rpm. The difference in destructive effect compared with the Hispano was even greater than these figures indicate, because the Allies also benefited from another German development; the Minengeschoss or mine shells.
Luftwaffe 20mm MG-FF ammunition: HE-T, Minengeschoss and API
The Minengeschoss were high-capacity shells with very thin walls which approximately doubled the HEI content of the shells, as you can see in the above picture of sectioned Luftwaffe 20 mm ammunition: compare the space for explosive in the HE-T and the Minengeschoss, even allowing for the tracer in the former. When used in the Aden, this resulted in the 30 mm shells having four times the blast effect of the Hispano's. Aden ammunition also used another German development, tungsten-cored AP projectiles."
They copied the Minengeschoß, so it should be effective.