Armor-piercing projectiles

Claim 1

A PROJECTILE WHICH COMPRISES, IN COMBINATION, AN ARMOR PIERCING CORE, AN OGIVE MOUNTED ON SAID CORE TO SURROUND IT, SAID OGIVE BEING MADE OF A MATERIAL OF A DENSITY MUCH LOWER THAN THAT OF SAID CORE, SAID OGIVE HAVING A CYLINDRICAL REAR PORTION OF A CROSS SECTION SMALLER THAN THE MAXIMUM CROSS SECTION OF ITS FRONT PORTION, THE OUTER WALL OF SAID OGIVE FORMING, BETWEEN SAID FRONT PORTION AND SAID REAR PORTION THEREOF, A REARWARDLY FACING ANNULAR SHOULDER, A CYLINDRICAL BASE FITTING TIGHTLY AROUND SAID OGIVE REAR PORTION, SAID BASE BEING CMADE OF A MANTERIAL OF AT LEAST APPROXIMATELY THE SAME DENSITY AS SAID OGIVE, THE FRONT EDGE OF SAID BASE BEING AT A DISTANCE FROM SAID SHOULDER AND FACINT IT, A SOLID FRONT GUIDING RING OF A MATEIRAL HARDER THAN THAT OF SAID OGIVE FITTED ON THE SIDE WALL OF SAID REAR PORTION OF THE OGIVE, EXTENDING FROM SAID SHOULDER TO SAID BASE FRONT EDGE AND HAVING AN OUTER DIAMETER SLIGHTLY GREATER THAN THAT OF SAID BASE AND THAT OF THE OUTER EDGE OF SAID SHOULDER, A REAR CYLINDRICAL EXTENSION OF SAID BASE INTEGRAL THEREWITH, SAID EXTENSION HAVING AN OUTER DIAMETER SMALLER THAN THAT OF SAID BASE, A RIGID REAR CYLINDRICAL GUIDING RING FITTING TIGHTLY AROUND SAID REAR EXTENSION, SAID REAR RING BEING MADE OF A MATERIAL DIFFERENT FROM THAT OF SAID REAR EXTENSION AND OF SUBSTANTIALLY THE SAME HARDNESS AS THAT OF SAID FRONT RING, SAID REAR RING FURTHER HAVING AN OUTER DIAMETER SUBSTANTIALLY EQUAL TO THAT OF SAID BASE AND TO THAT OF THE OUTER EDGE OF SAID SHOULDER, AND A DRIVING BAND OF A METAL SOFTER THAN THAT OF SAID GUIDING RINGS FIXED AROUND SAID REAR RING FOR GIVING THE PROJECTILE ITS SPIN, SAID DRIVING BAND HAVING AN OUTER DIAMETER GREATER THAN THAT OF SAID GUIDING RINGS AND FURTHER HAVING AN AXIL LENGTH SUBSTANTIALLY LESS THAN THE AXIAL LENGTH OF SAID REAR GUIDING RING.