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I believe that the British military was considering adopting one of Gerlich's .280 bolt actions. I dont know why they didnt but this .280 could push 180 gr. bullet at 3350FPS. At 300yds it could shoot a (then amazing) 3.65in. group. It could also fire the commercial .280 Ross cartridge. Im not sure if this gun used the tapered bore or just a lot of powder. As far as other tapered bore guns you are correct. Germany also used the 4.2cm PzJK 41 ,which tapered from 40.6mm to 29.4mm, and the 7.5cm PAK 41 which used a removable squeeze section on the muzzle to sqeeze the shell from 75mm to 55mm. The 4.2cm could propel a 11.85oz projectile at 4150FPS. The 7.5cm could push a 5.71 pound shell at almost 3700FPS making it one the most formidable tank killers of its day.
Minihuntur
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