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20mm From 1.10" 75cal.
- Thread starter bacarnal
- Start date
Bruce some details below.
The necked down rounds are one of my favourites they're just really difficult to find here in the UK at least.
20 x 197 SR shown next to standard 1.1 USN plus headstamp of the 20mm.
"The cartridge is a necked down verion of the 28 x 199/SR and dates back to the beginning of the fifties. The "weapon" was a test barrel for testing projectiles at very high initial velocities.
For the tests cases from old stocks were used. Projectiles were identical in shape to the 20 x 110 (of US manufacture) and the 20 x 102.
The case headstamps were not adapted to the new projectile.
Information provided by G Aevermann, USA".
Other necked down 20mm rounds.
In addition to the 1.1/20mm USN shown above here are a few more.
20 x 234/B (necked down from the 30 x 184B) - Germany
"This is a necked down 30mm made by Mr W. van der Eng (Netherlands) from an original Rheinmetall Borsig factory drawing (Patrone 20/30 - Nr T-SKD-40)". Note the "R" denoting reproduction. I'm not aware of any real ones of these but am happy to stand corrected.
"Steel case and normal 20mm projectile".
20 x 311/SR - (necked down from 40 L60 - USA
This is a necked down 40 x 311/SR Bofors L 60 which was used for fuze testing in the 1960's.
The case head stamp was not adapted to the projectiles.
All information taken from "Military Cartridges part 3 by W D de Hek.
All INERT.
Dave.
The necked down rounds are one of my favourites they're just really difficult to find here in the UK at least.
20 x 197 SR shown next to standard 1.1 USN plus headstamp of the 20mm.
"The cartridge is a necked down verion of the 28 x 199/SR and dates back to the beginning of the fifties. The "weapon" was a test barrel for testing projectiles at very high initial velocities.
For the tests cases from old stocks were used. Projectiles were identical in shape to the 20 x 110 (of US manufacture) and the 20 x 102.
The case headstamps were not adapted to the new projectile.
Information provided by G Aevermann, USA".
Other necked down 20mm rounds.
In addition to the 1.1/20mm USN shown above here are a few more.
20 x 234/B (necked down from the 30 x 184B) - Germany
"This is a necked down 30mm made by Mr W. van der Eng (Netherlands) from an original Rheinmetall Borsig factory drawing (Patrone 20/30 - Nr T-SKD-40)". Note the "R" denoting reproduction. I'm not aware of any real ones of these but am happy to stand corrected.
"Steel case and normal 20mm projectile".
20 x 311/SR - (necked down from 40 L60 - USA
This is a necked down 40 x 311/SR Bofors L 60 which was used for fuze testing in the 1960's.
The case head stamp was not adapted to the projectiles.
All information taken from "Military Cartridges part 3 by W D de Hek.
All INERT.
Dave.
Last edited:
Thank you, Dave. I can now breath a HEAVY sigh of relief. I was pretty sure that I had heard or read something about this but, to be honest, I was shooting in the dark. It looked real good for what it was, but I wasn't sure that someone had create a fantasy round. We had the Show of Shows (Ohio Valley Military Society) here in Louisville this weekend and there were quite a few dealers in ordnance. I stopped at a few, though I could ill afford it till I made some back at the National Gun Day show next door. Quite a good weekend with several interesting pieces. Cheers, Bruce.
