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German Balkenkreuz

Germany's 2.8-cm schwere Panzerbüschse 41
2.8-cm sPzB 41

It was a taper-bore gun went from 28 mm to 20 mm.1 It was based on the Gerlich principle.1 The rounds would have special flanges that would fold back as the shell went down the barrel.1 This would increase the shells velocity out the end of the barrel.1

There was one design, that had a lighter carriage, that was intended to be used in the airborne forces.1

  2.8-cm sPzB 41
Starting Caliber 1.1"1
28 mm1
Emerging Caliber 0.787"1
20 mm1
Length of gun 5' 7"1
1.7 m1
Length of bore  
Rifling  
Length of rifling  
Weight traveling  
Weight in action 492 lb1
223 kg1
Elevation -5° to +45°1
Traverse 90°1
Muzzle Velocity AP: 4,593'/sec1
AP: 1,400 m/sec1
Range of shell  
Shell weight AP: 0.27 lb1
AP: 0.124 kg1
Armor penetration AP: 2.205" @ 400 yards1
AP: 56 mm @ 365 m1
Breech mechanism  

Sources:

  1. The Encyclopedia of Weapons of World War II, 1998, Chris Bishop
20th Century American Military History Crucial Site