Round heavy metal thing with some melt marks on it?...

[Watchdog]

I believe it is some type of pusher sabot round for ballistic testing, either for high speed aerodynamics, impact testing.

Well, it wouldn't be a sabot which is a device made of two or more pieces that hold a "sub-calibre" projectile in the centre of a bore to ensure accurate discharge and which falls away as the projectile leaves the muzzle (see modern APFSDS tank rounds) tending to increase muzzle velocity but yes it is clearly something that has been through a rifled barrel perhaps to push another item or maybe to test the efficiency of the gun itself. The seccond piece clearly did not travel cleanly along the bore as the end opposite the driving band has contacted the barrel rifling causing those distinctive striations.

Annoyingly, I still feel I have seen it before but can't place it.

Regards

Mark

[Jb4046]

I think the D-10T is a match. The space between the rifling on the photo i have “borrowed” seems to have a similar width to the projectile rifling marks

[Watchdog]

I think the D-10T is a match. The space between the rifling on the photo i have “borrowed” seems to have a similar width to the projectile rifling marks

Well, it does look to be about 100mm but you also need to consider the number of lands and grooves as well as the pitch and twist which is a bit difficult in these pictures but I think the alternatives are limited.

Regards

Mark

[mathat]

Well it most likely is some testing and maintenance slug but if Watchdog or anyone remember or come across this kind of thing drop a line in here Thanks Thanks...