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A warhead configuration for forming a hole through a wall of a target, the warhead configuration comprising a charge of explosive material and a liner. The charge has an axis and a front surface. The front surface includes two annular front surface portions, an inner and an outer annular portion, ci

A warhead configuration for forming a hole through a wall of a target, the warhead configuration comprising a charge of explosive material and a liner. The charge has an axis and a front surface. The front surface includes two annular front surface portions, an inner and an outer annular portion, circumscribing the axis. Each of the annular front surface portions is configured so as to exhibit a concave profile as viewed in a cross-section through the charge parallel to the axis. The liner includes a first liner disposed adjacent to the inner annular portion and a second liner disposed adjacent to the outer annular portion such that, when the charge is detonated, material from the first liner is formed into a first expanding explosively formed ring and material from the second liner is formed into a second explosively formed ring.

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What is claimed is: 1. A warhead configuration for forming a hole through a wall of a target, the warhead configuration comprising: (a) a charge of explosive material, said charge having an axis and a front surface, said front surface including two annular front surface portions circumscribing said

What is claimed is: 1. A warhead configuration for forming a hole through a wall of a target, the warhead configuration comprising: (a) a charge of explosive material, said charge having an axis and a front surface, said front surface including two annular front surface portions circumscribing said axis, one of said annular front surface portions being an inner annular portion, another of said annular front surface portions being an outer annular portion, said inner annular portion being disposed between said axis and said outer annular portion, each of said two annular front surface portions being configured so as to exhibit a concave profile as viewed in a cross-section through said charge parallel to said axis, at least part of said concave profile of each of said two annular front surface portions being configured such that a vector projecting outward from said part in a direction normal to said annular front surface portion diverges from said axis; and (b) a liner including a first liner disposed adjacent to at least part of said inner annular portion and a second liner disposed adjacent to at least part of said outer annular portion, said charge and said liner being configured such that, when said charge is detonated, material from said first liner is formed into a first forward-directed expanding explosively formed ring and material from said second liner is formed into a second forward-directed expanding explosively formed ring, wherein said inner and outer annular front surface portions and said liner are configured such that, when the warhead is detonated with said front surface proximal to a plane and said axis inclined at an angle relative to a line orthogonal to said plane, said first and second expanding explosively formed rings impinge on said lane so as to define inner and outer generally-elliptical footprints, respectively, on said plane. 2. The warhead configuration of claim 1, wherein: (a) a first average vector is defined as the vector average of two vectors projecting normally outward from opposite extremes of said concave profile of said inner annular portion; (b) a second average vector is defined as the vector average of two vectors projecting normally outward from opposite extremes of said concave profile of said outer annular portion; (c) a first angle is defined as an angle between said first average vector and said axis; (d) a second angle is defined as an angle between said second average vector and said axis; and (e) said second angle exceeds said first angle by at least 5°. 3. The warhead configuration of claim 1, wherein: (a) said first expanding explosively formed ring exhibits a first expanding conical path having a first angle relative to said axis; (b) said second expanding explosively formed ring exhibits a second expanding conical path having a second angle relative to said axis; and (c) said second angle exceeds said first angle by at least 5 degrees. 4. The warhead configuration of claim 1, wherein said two annular front surface portions are substantially rotationally symmetric about said axis. 5. The warhead configuration of claim. 1, wherein said concave profile corresponds substantially to an arc of a circle. 6. The warhead configuration of claim 5, wherein said arc subtends an angle of between 15° and 90° to a center of curvature of said arc. 7. The warhead configuration of claim 5, wherein said arc subtends an angle of between 30° and 70° to a center of curvature of said arc. 8. The warhead configuration of claim 1, wherein said concave profile turns through an angle of between 15° and 90°. 9. The warhead configuration of claim 1, wherein said concave profile turns through an angle of between 30° and 70°. 10. The warhead configuration of claim 1, wherein said two annular front surface portions correspond to at least about two-thirds of the total front surface of said charge as viewed parallel to said axis. 11. The warhead configuration of claim 1, wherein said two annular front surface portions correspond to at least about 90% of the total front surface of said charge as viewed parallel to said axis. 12. The warhead configuration of claim 1, wherein said charge and said liner are configured such that detonation of said explosive material imparts a velocity to said liner of between about 1000 and about 4000 meters per second. 13. The warhead configuration of claim 1, further comprising a central portion adjacent to said central axis having a generally convexly curved shape. 14. The warhead configuration of claim 1, wherein said charge includes between about 1 kg and about 3 kg of explosive material. 15. The warhead configuration of claim 1, wherein said charge includes less than about 2 kg of explosive material. 16. The warhead configuration of claim 1, further comprising a stand off detonation system including means for defining a stand off detonation distance of said charge from the wall. 17. The warhead configuration of claim 16, wherein said means for defining a stand off detonation distance includes a stand off rod projecting from said front surface substantially parallel to said axis. 18. The warhead configuration of claim 1, wherein said charge has a rear surface, the warhead further comprising a rear cover associated with at least said rear surface, said rear cover being formed from a non-fragmenting material. 19. A warhead configuration for forming a hole through a wall of a target, the warhead configuration comprising: (a) a charge of explosive material, said charge having an axis and presenting a front portion; and (b) a liner disposed adjacent to at least part of said front portion, wherein said charge and said liner are configured such that, when said charge is detonated, a majority of material from said liner forms two forward-directed expanding explosively formed rings, wherein said charge and said liner are configured such that, when the warhead is detonated with said front portion proximal to a plane and said axis inclined at an angle relative to a line orthogonal to said plane said two expanding explosively formed rings impinge on said plane so as to define two distinct generally-elliptical footprints on said plane. 20. The warhead configuration of claim 19, wherein: (a) one of said two expanding explosively formed rings exhibits a first expanding conical path having a first angle relative to said axis; (b) another of said two expanding explosively formed rings exhibits a second expanding conical path having a second angle relative to said axis; and (c) said second angle exceeds said first angle by at least 5 degrees.