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A duplex projectile to be fired from a gun bore is made up of a tubular pectile and a conical shaped projectile fastened within the tubular projectile by means which are capable of withstanding acceleration forces on the round while the round is within the bore after being fired but which release t

A duplex projectile to be fired from a gun bore is made up of a tubular pectile and a conical shaped projectile fastened within the tubular projectile by means which are capable of withstanding acceleration forces on the round while the round is within the bore after being fired but which release the conical projectile from the tubular projectile once the two exit from the bore.

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1. A duplex round comprising: a tubular projectile of a dense material adapted for target penetration and having a central axial bore; a sub-diameter projectile held within said axial bore throughout its length and configured to be an obturator for said tubular projectile; and bonding material

1. A duplex round comprising: a tubular projectile of a dense material adapted for target penetration and having a central axial bore; a sub-diameter projectile held within said axial bore throughout its length and configured to be an obturator for said tubular projectile; and bonding material between said sub-diameter projectile and said tubular projectile and adapted to form a seal therebetween which is compressable during the interior ballistic phase of projectile flight and releases during aerial flight to permit separation of the two projectiles. 2. A duplex round according to claim 1 wherein said sub-diameter projectile has a hollowed out portion in its base. 3. A duplex round according to claim 1, wherein said sub-diameter projectile has a first hollowed out portion in its base and a second hollowed out portion inside of it forward of said first hollowed out portion, said first hollowed out portion adapted to hold a propellant grain and said second hollowed out portion adapted to hold an explosive charge. 4. A duplex round according to claim 1 wherein said sub-diameter projectile has a first hollowed out portion in its base, a second hollowed out portion inside of it forward of said first hollowed out portion and an opening connecting said first hollowed out portion with said second hollowed out portion, said second hollowed out portion being adapted to hold incendiary material. 5. A duplex round according to claim 4 wherein said first hollowed out portion is adapted to hold gun powder. 6. A duplex round according to claim 1 wherein said bonding material is silicone rubber impregnated with microbaloons. 7. A duplex round according to claim 1 wherein said bonding material is silicone rubber with air entrained in it. 8. A duplex round comprising: a tubular projectile having a central axial bore; a sub-diameter projectile having a depleted uranium nose and a light pyropheric base end with a first hollowed-out portion in the base end and second, inside, hollowed-out portion adapted to hold incendiary material forward from said first hollowed-out portion and an opening connecting said first and second hollowed-out portions; and bonding material between said sub-diameter projectile and said tubular projectile adapted to form a seal therebetween which is compressable during the interior ballistic phase of projectile flight but releases during aerial flight to permit separation of the two projectiles. 9. A duplex round according to claim 8 wherein said pyrophoric material is aluminum. 10. A duplex round according to claim 8 wherein said pyrophoric material is titanium.