A multiple-charge cartridge is disclosed. The cartridge includes an annular casing having an interior void and a primer. A rotatable selector ring is positioned circumferentially about at least a portion of the annular casing. A cam is positioned in the interior void and includes a first charge and
A multiple-charge cartridge is disclosed. The cartridge includes an annular casing having an interior void and a primer. A rotatable selector ring is positioned circumferentially about at least a portion of the annular casing. A cam is positioned in the interior void and includes a first charge and a second charge. The cam is coupled to the rotatable selector ring and is configured to rotate about an axis in response to a rotation of the rotatable selector ring. The cam is configured to align the first charge with the primer in response to a rotation of the rotatable selector ring to a first user-selectable position, and to align the second charge with the primer in response to a rotation of the rotatable selector ring to a second user-selectable position.
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1. A cartridge, comprising: an annular casing having an interior void and a primer, the annular casing comprising an annular rim configured to inhibit forward movement of the annular casing with respect to a barrel of a firearm;a rotatable selector ring positioned circumferentially about at least a
1. A cartridge, comprising: an annular casing having an interior void and a primer, the annular casing comprising an annular rim configured to inhibit forward movement of the annular casing with respect to a barrel of a firearm;a rotatable selector ring positioned circumferentially about at least a portion of the annular casing; anda cam positioned in the interior void and comprising a first charge and a second charge, the cam coupled to the rotatable selector ring and configured to rotate about an axis in response to a rotation of the rotatable selector ring, wherein the cam is configured to align the first charge with the primer in response to a rotation of the rotatable selector ring to a first user-selectable position, and to align the second charge with the primer in response to a rotation of the rotatable selector ring to a second user-selectable position, a selected charge of the first charge and the second charge configured to, upon detonation, generate sufficient pressure to propel a projectile through the barrel of the firearm. 2. The cartridge of claim 1, wherein the annular casing forms an opening between at least a portion of the rotatable selector ring and the cam, the rotatable selector ring comprising an extension configured to extend through the opening and engage a recess of the cam to couple the cam to the rotatable selector ring. 3. The cartridge of claim 1, wherein the first charge is configured to generate a first energy upon detonation, and the second charge is configured to generate a second energy upon detonation that is greater than the first energy. 4. The cartridge of claim 1, wherein the cam further comprises a third charge, and is configured to align the third charge with the primer in response to a rotation of the rotatable selector ring to a third user-selectable position. 5. The cartridge of claim 1, wherein the cam comprises at least a first surface indentation associated with the first charge and a second surface indentation associated with the second charge, the cartridge further comprising: a plunger disposed within the interior void, the plunger configured to engage the first surface indentation when the rotatable selector ring is in the first user-selectable position and to engage the second surface indentation when the rotatable selector ring is in the second user-selectable position. 6. The cartridge of claim 5, wherein the plunger comprises a spring in compressible communication with a ball, the spring configured to urge the ball against the cam to provide resistance via the cam to the rotation of the rotatable selector ring. 7. The cartridge of claim 1, further comprising a pressure chamber, the pressure chamber formed at least in part by a plate separating the pressure chamber from the interior void, the plate forming a first opening between the pressure chamber and the interior void, wherein in the first user-selectable position of the rotatable selector ring the cam is configured to align a detonation direction of the first charge with the first opening and, in the second user-selectable position of the rotatable selector ring, to align a detonation direction of the second charge with the first opening, such that a selected charge of one of the first charge and the second charge detonates into the pressure chamber. 8. The cartridge of claim 7, wherein the plate further forms a second opening between the pressure chamber and the interior void that facilitates pressure exchange between the interior void and the pressure chamber upon detonation of an unselected charge. 9. The cartridge of claim 7, wherein the primer is configured to, upon ignition, detonate the selected charge of the one of the first charge and the second charge that is aligned with the primer. 10. The cartridge of claim 1, wherein the first charge is located in a first void of the cam and the second charge is located in a second void of the cam, and wherein the cam forms a first vent opening between the first void and the interior void and forms a second vent opening between the second void and the interior void. 11. The cartridge of claim 10, further comprising a first burstable layer positioned between the first charge and the first vent opening and a second burstable layer positioned between the second charge and the second vent opening. 12. The cartridge of claim 11, further comprising a fuse coupled between the first charge and the second charge. 13. The cartridge of claim 12, wherein the fuse is positioned to ignite upon detonation of a selected charge of the first charge and the second charge, and configured to detonate an unselected charge of the first charge and the second charge. 14. The cartridge of claim 13, wherein the fuse is configured to detonate the unselected charge within a period of time between about ⅓ of a second and about 1 second of ignition of the fuse. 15. The cartridge of claim 13, wherein the unselected charge is configured to direct energy through a respective burstable cover and into the interior void upon detonation. 16. The cartridge of claim 1, further comprising a less-than-lethal projectile. 17. A multiple-charge cartridge, comprising: an annular casing having an interior void and a primer charge, the annular casing comprising an annular rim configured to inhibit forward movement of the annular casing with respect to a barrel of a firearm;a rotatable selector ring positioned circumferentially about at least a portion of the annular casing;a cam positioned in the interior void and coupled to the rotatable selector ring, the cam comprising a first charge and a second charge and at least two surface indentations including a first surface indentation associated with the first charge and a second surface indentation associated with the second charge, the first charge and the second charge configured to, upon detonation, generate sufficient pressure to propel a projectile through the barrel of the firearm; anda plunger configured to selectively engage a selected surface indentation of the at least two surface indentations in response to a rotation of the rotatable selector ring to facilitate user selection of the first charge or the second charge. 18. The multiple-charge cartridge of claim 17, wherein the cam is further configured to align the first charge with the primer charge when the plunger selectively engages the first surface indentation and to align the second charge with the primer charge when the plunger selectively engages the second surface indentation. 19. A charge-selectable cartridge, comprising: a casing forming an interior void and an exterior channel about a portion of an exterior surface of the casing, the casing comprising an annular rim configured to inhibit forward movement of the casing with respect to a barrel of a firearm;a rotatable selector ring positioned circumferentially in the exterior channel; anda cam positioned in the interior void and rotatably coupled to the rotatable selector ring, wherein the cam is configured to set the charge-selectable cartridge to a first charge for a first range and a second charge for a second range that is different from the first range based on a setting of the rotatable selector ring, the first charge and the second charge configured to, upon detonation, generate sufficient pressure to propel a projectile through the barrel of the firearm. 20. The charge-selectable cartridge of claim 19, wherein the cam comprises the first charge and the second charge, and is configured to rotate in response to a rotation of the rotatable selector ring to set the charge-selectable cartridge to the first charge for the first range and to the second charge for the second range based on a setting of the rotatable selector ring.
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