I finally got this a couple of days ago after many years of looking for one!!
Its an experimental 20 X 158 T5 round.
I can't find out much information on it other than what Tony Williams mentions in his book "Flying guns the modern era":
"Another US post-war experimental 20mm gun project was the T33, which was originally worked on by Oldsmobile but taken over in 1946 by the Armor Research Foundation (ARF). It was a gas-unlocked blowback obviously ifluenced by the Hispano, bur using a bolt locking mechanism mased on the Rheinmetall-Borsig Mk 103. It was initially designed around the big T5 20 X 158RB cartridge, although in 1948 a decision was taken to change to the new 20 X 102".
Does anyone have any further information on the weapon, performance of it etc?
The headstamp is quite hard to make out - what I can see is as follows:
LOT F.A..E 1211945
20MM T5
There are no stampings on the primer.
Stencling on the projectile is as follows:
PROJ. PRAC
20MM., M99
PA-E-660
Stamping on the driving band is as follows:
mat-4-8
45
20MM M99
Rim diameter is 30.4mm
Primer diameter is 13.1mm
All INERT etc, big hole in the back/primer oiled etc.
Thanks.
Dave.
Its an experimental 20 X 158 T5 round.
I can't find out much information on it other than what Tony Williams mentions in his book "Flying guns the modern era":
"Another US post-war experimental 20mm gun project was the T33, which was originally worked on by Oldsmobile but taken over in 1946 by the Armor Research Foundation (ARF). It was a gas-unlocked blowback obviously ifluenced by the Hispano, bur using a bolt locking mechanism mased on the Rheinmetall-Borsig Mk 103. It was initially designed around the big T5 20 X 158RB cartridge, although in 1948 a decision was taken to change to the new 20 X 102".
Does anyone have any further information on the weapon, performance of it etc?
The headstamp is quite hard to make out - what I can see is as follows:
LOT F.A..E 1211945
20MM T5
There are no stampings on the primer.
Stencling on the projectile is as follows:
PROJ. PRAC
20MM., M99
PA-E-660
Stamping on the driving band is as follows:
mat-4-8
45
20MM M99
Rim diameter is 30.4mm
Primer diameter is 13.1mm
All INERT etc, big hole in the back/primer oiled etc.
Thanks.
Dave.