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An ammunition projectile comprising a metal jacket containing a powder-based core incompletely filling the trailing end of the jacket, and a disc overlying the trailing end of the core within the jacket, the disc being frangible by reason of a plurality of indentations in at least one face of the di

An ammunition projectile comprising a metal jacket containing a powder-based core incompletely filling the trailing end of the jacket, and a disc overlying the trailing end of the core within the jacket, the disc being frangible by reason of a plurality of indentations in at least one face of the disc. A method is claimed.

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What is claimed: 1. In a jacketed frangible ammunition projectile including a jacket initially of a generally cup-shaped hollow cylindrical geometry and having a closed end and an open end, a powder-based core disposed within the jacket with its trailing end disposed adjacent the open end of the ja

What is claimed: 1. In a jacketed frangible ammunition projectile including a jacket initially of a generally cup-shaped hollow cylindrical geometry and having a closed end and an open end, a powder-based core disposed within the jacket with its trailing end disposed adjacent the open end of the jacket, and a disc having opposite faces, overlying the trailing end of the core in covering relationship thereto, the improvement comprising a plurality of indentations extending into the thickness of the disc from at least one face thereof said indentations being disposed substantially uniformly over the total area of the face of the disc. 2. The improvement of claim 1 wherein said indentations extend into the thickness of the disc a distance equal to between about 20% and about 75% of the thickness of the disc. 3. The improvement of claim 1 wherein said indentations extend into the thickness of the disc a distance not greater than about 50% of the thickness of the disc. 4. The improvement of claim 1 wherein said indentations are defined by a pattern of intersecting parallel, side-by-side elongated indentations which extend substantially fully across the area of said at least one face of the disc. 5. The improvement of claim 1 wherein said indentations are each of substantially like geometry. 6. The improvement of claim 4 wherein said intersecting elongated indentations define generally pyramidal projections which extend outwardly from at least one face of the disc. 7. The improvement of claim 1 including a pattern of indentations extending into the thickness of the disc from each of the opposite faces of the disc. 8. The improvement of claim 1 wherein said indentations extending into the thickness of the disc define a plurality of conical projections extending away from at least one face of the disc. 9. A projectile for gun ammunition comprising a jacket of generally hollow cylindrical cup-shape and having an open end and an opposite closed end, a powder-based core disposed within said jacket and having a trailing end disposed adjacent said open end of said jacket, a disc having first and second opposite generally planar faces disposed within said jacket in overlying and covering relationship to said trailing end of said core, and a plurality of indentations extending into the thickness of said disc from at least one face of said disc, said core and said disc incompletely filling said hollow jacket, leaving a rim portion of said open end of said jacket void of said core and said disc, said rim portion of said jacket being folded radially inwardly of said jacket into locking engagement with said disc, whereby said open end of said jacket is closed against the escape of powder particularlates of said core out of said jacket prior to said projectile striking a target, said disc disintegrating into harmlessly-sized fragments upon said projectile striking a solid or semi-solid target. 10. The projectile of claim 9 wherein said indentations extend into the thickness of said disc a distance not greater than about 75% of the thickness of said disc. 11. The projectile of claim 9 wherein said indentions extend into the thickness of said disc a distance equal to between about 20% and about 75% of the thickness of said disc. 12. The projectile of claim 9 wherein said indentations are disposed according to a pattern of intersecting parallel, side-by-side elongated indentations which extend substantially fully across said at least one face of said disc. 13. The projectile of claim 9 wherein said indentations are disposed substantially uniformly over said at least one face of said disc. 14. The projectile of claim 9 wherein said indentations are disposed substantially over the area of each of said first and second opposite faces of said disc. 15. A method for the formation of a gun ammunition projectile which substantially disintegrates into harmless fragments upon the projectile striking a target comprising the steps of disposing a powder-based core within a cup-shaped jacket having a closed end and an initially open trailing end, said core including a trailing end which is disposed adjacent said open trailing end of said jacket and incompletely filling said open end of said jacket, leaving a portion of said jacket projecting beyond said trailing end of said core, providing a disc having opposite generally planar faces and including a plurality of indentations extending into the thickness of said disc from at least one face of said disc, depositing said disc into said open end of said jacket with said disc being positioned in overlying and covering relationship to said trailing end of said core and incompletely filling said open end of said jacket, thereafter infolding said unfilled portion of said jacket back upon said disc to lock said disc and core within said jacket. 16. The method of claim 15 and including the step of providing indentations extending into the thickness of said disc from each of said opposite faces of said disc. 17. The method of claim 15 wherein said indentations extend into the thickness of said disc a distance of between about 20% and 75% of the thickness of said disc. 18. The method of claim 15 wherein said indentations are uniformly spaced relative to one another and extend over substantially the full area of said at least one of said faces. 19. The method of claim 15 wherein said indentations comprises a first plurality of parallel, side-by-side, elongated indentations which perpendicularly intersect with a second plurality of parallel, side-by-side, elongated indentations to define a plurality of uniformly spaced projections extending outwardly from at least one face of said disc. 20. The method of claim 19 wherein each of said projections is a pyramidal geometry with their respective apices extending in a direction away from said at least one face of said disc. 21. The method of claim 15 wherein said plurality of indentations defines a plurality of projections extending away from said at least one face of said disc.