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Unknown 20mm?

orcutteod

Well-Known Member
A friend of mine pick this up and doesn't know what it is neither do I. Looks to be a 20mm/25mm shell. Any ideas what it is?
Thanks
 

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30mm ADEN LV (Low Velocity) Practice, or the US equivalent of the time (late'40's-early '50's).
Looks to still be live?.
 
I recently got a very similar one that is a US 30mm T158 TP round (T241 projectile).

It looks identical to yours except it still has the paint. Is there any markings on the drive band or the rim of the case?
 

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Sorry for such a long delay in response Their are no marking on the drive band but their are markings on the shell case. Which are very hard to make out but I read a TR-2 and their are another numbers and letters I cant make out. Interesting how the projectile has a rounded base just like a lot of German 20mm and 30mm projectiles. The person I got this 30mm used to work for Hughes Armament. I also got some US 60 cal that never went into production.
 

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Interesting how the projectile has a rounded base just like a lot of German 20mm and 30mm projectiles.

Yes, the Allies copied the German developments immediately after WW2, including the rounded base which is characteristic of the early thin-walled Minengeschoss high-capacity shells. Only later did they discover that this is a bad idea as the lack of an aerodynamic "break point" for the air flow over the body affects accuracy. Some current ammo still has a mostly rounded base, but with a sharp break-point before the base. This is illustrated below by a Bofors 57 mm round.

57Bofors.jpeg
 
Enclosed is a side by side comparison of the US 30mm and a ME262 30mm. Also two US .60 cal my friend gave me. With side by side comparison with a .50 cal BMG projectile. The shell casing has Lot FA 4. Looks to be a Franklin Arsenal dated 1950 on the two .60,s.
 

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