BOCN Guess what it is

[siegfreid]

Japanese rifle grenade ?

 

[SG500]

Some sort of composite rigid cannon round where the lightweight alloy has corroded away?

 

[HAZORD]

SG500 is partially correct. Here are a couple more photos. Its not a rifle grenade and not Japanese.

 

[SG500]

30mm cannon round?

 

[HAZORD]

It's larger than 30mm.

 

[siegfreid]

37mm cannon shell ?

 

[SG500]

It's larger than 30mm.

Mmmmmmmmm...........the driving band is really confusing me here, I don't recognise it at all.
57mm round?

 

[HAZORD]

larger than 37mm, smaller than 57mm.

 

[reccetrooper]

47mm :tinysmile_grin_t:

 

[HAZORD]

Smaller than 47mm. It's fairly recent design (past 20-25 years). I don't think anyone uses 47mm stuff much anymore.

 

[hangarman]

could it be Russian 45mm ?

 

[HAZORD]

It's not Russian, and not 45mm.

 

[SG500]

40mm? Possibly a Bofors L70 minus the outer sleeve that holds all the shrapnel balls in place?

Dave.

 

[HAZORD]

Good guess Dave! You are the winner! I was hoping you would come up with U.S. manufactured. These forgings showed up on the surplus market recently (last year or so). They were never finish machined, and evidently sat around in water and rusted for some time. The rotating band has been hammered on by a 6 segmented die as there are 6 raised lines on the band. All of the U.S. projectiles for the Sgt. York DIVADS (Divisional Air Defense) gun can be identified by the characteristic double crimping groove and the hemispherical base with shoulder. Photos below of the premachined forging next to a complete round. A sleeve of WC fragment balls in a silicone matrix is included. The PFPX on the projectile stands for Frefragmented Proximity Fuzed.

Dave, over to you!

 

[hangarman]

That "Rifled" drive band certainly threw me off the track....

 

[SG500]

Good guess Dave! You are the winner! I was hoping you would come up with U.S. manufactured. These forgings showed up on the surplus market recently (last year or so). They were never finish machined, and evidently sat around in water and rusted for some time. The rotating band has been hammered on by a 6 segmented die as there are 6 raised lines on the band. All of the U.S. projectiles for the Sgt. York DIVADS (Divisional Air Defense) gun can be identified by the characteristic double crimping groove and the hemispherical base with shoulder. Photos below of the premachined forging next to a complete round. A sleeve of WC fragment balls in a silicone matrix is included. The PFPX on the projectile stands for Frefragmented Proximity Fuzed.

Dave, over to you!

YES!!.
That was a great one Hazord, thanks.
Back in a minute, just going off to the top shelf to see what I can find.
Dave.

 

[SG500]

There you go, here's my offering.

Dave.

 

[HAZORD]

How about a sabot for a 40mm Fin stabilzed projectile?

 

[SG500]

How about a sabot for a 40mm Fin stabilzed projectile?

Very very warm.

 

[HAZORD]

OK, the front bore rider sabot for a 40 X 364R (L/70) APDS Projo?