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A projectile includes an ogive at a forward end and a projectile body removably coupled to an aft end of the ogive. A signal dye or a filler material is located within a first cavity in the projectile, wherein the first cavity is at least partially located within the ogive. A pyrophoric material is

A projectile includes an ogive at a forward end and a projectile body removably coupled to an aft end of the ogive. A signal dye or a filler material is located within a first cavity in the projectile, wherein the first cavity is at least partially located within the ogive. A pyrophoric material is also located within the first cavity, wherein the pyrophoric material is hermetically sealed either within or by the first cavity.

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1. A projectile, comprising: a. an ogive at a forward end of the projectile;b. a projectile body removably coupled to an aft end of said ogive;c. a signal dye or a filler material within a first cavity in said projectile, wherein said first cavity is at least partially located within said ogive;d. a

1. A projectile, comprising: a. an ogive at a forward end of the projectile;b. a projectile body removably coupled to an aft end of said ogive;c. a signal dye or a filler material within a first cavity in said projectile, wherein said first cavity is at least partially located within said ogive;d. a frangible ampoule sheathed in a plastic sheath in said first cavity and coupled to the projectile body, the ampoule containing a pyrophoric material within said ampoule, wherein said pyrophoric material is hermetically sealed within said ampoule; ande. an inert gas within said ampoule preventing oxygen from contact with said pyrophoric material. 2. A projectile as recited in claim 1, further comprising a ballistic weight either within or constituted by said projectile body, wherein at least a portion of said ballistic weight is located aft of said aft end of said ogive. 3. A projectile as recited in claim 2, wherein said projectile is for use in an ammunition training cartridge, and a weight of said ballistic weight in combination with a weight of a remaining portion of said projectile is configured so that a total weight of said projectile and a location of a center of gravity of said projectile substantially matches that of a corresponding projectile in a live ammunition cartridge to which said ammunition training cartridge corresponds. 4. A projectile as recited in claim 1, wherein said sheathed ampoule is located entirely within said ogive. 5. A projectile as recited in claim 1, wherein at least a portion of said signal dye or said filler material is located in an annular region between an outside of said frangible ampoule and an inside of said ogive. 6. A projectile as recited in claim 1, further comprising: a. the ampoule is a frangible glass ampoule located within said first cavity; andb. an ampoule closure at an opening of said frangible ampoule, wherein said ampoule closure provides for sealing said opening of said frangible ampoule and for defining a second cavity within said frangible ampoule, said pyrophoric material and said inert gas are located within said second cavity, and said second cavity is hermetically sealed by said ampoule closure so as to provide for hermetically sealing said pyrophoric material within said first cavity. 7. A projectile as recited in claim 6, wherein an outside cylindrical surface of said frangible ampoule mates with and is sealed to an inside cylindrical surface of said ogive. 8. A projectile as recited in claim 7, wherein a substantial portion of a forward end of said frangible ampoule comprises a relatively flat surface. 9. A projectile as recited in claim 6, wherein said first cavity comprises a solid material that provides for cushioning said frangible ampoule. 10. A projectile as recited in claim 1, wherein said pyrophoric material comprises at least one metallic powder of at least one material selected from the group consisting of iron, aluminum and magnesium. 11. A projectile as recited in claim 1, wherein said projectile is assembled to a cartridge-case sub-assembly so as to form an ammunition training cartridge assembly. 12. A projectile as recited in claim 1, wherein said projectile is configured as an incendiary projectile and is assembled to a cartridge-case sub-assembly so as to form an incendiary cartridge assembly. 13. A projectile as recited in claim 1, wherein said filler material comprises an inert powder or granular material. 14. A projectile as recited in claim 1, wherein said filler material provides a ballast mass within said projectile.