The cases are heavy because they have thick walls.
They are turned on a lathe and have no hstp.
The inside of each case is in fact 5 mm shorter than the outside length
The cases have the name Penna engraced on the side.
Different calibers exist, most of them rimmless
From left to right
7 x 23 rimmless (7penna QS engraved on the side) with a standard bullet
7 x 28 rimmless (7penna QS engraved on the side)
7 x 33 rimmless (7penna QS engraved on the side)
7 x 28 rimmed (7penna QS engraved on the side)
The rimmless ctges are shot in a NON locked bolt gun.
Therefore the walls of the case must be thick enough to stay attached to the last 5mm of the case already out of the chamber when the bullet leaves the barrel.
The 7x23 is shot in a converted 1911 colt pistol with a fixed barred.
The concept of these ctges is to shoot very light bullets at very high speed in order to achieve good penetration.
The bullets can be very light (hollow monolithic brass) for use within 5 meters (15 feet) or light (monolithic brass) for use farther.
Some high armor piercing bullets exist (monolithic aluminium).
From left to right :
a fired 23 mm case (you can see the swelling of the case)
a standard brass bullet
a very light brass bullet (you can see the hole in the base)
an high armor piercing aluminium bullet
I will give you weight measurements, velocity and other info in the next post;