05-24-2011, 03:10 PM
Threshold: Steel plate defeat
[INDENT]Equal or exceed the range at which the 7.62mm M80 round or the 5.56 M855 round from a 20" barrel can perforate a 3.5 mm (10 gauge) steel plate when using an open tip match bullet (E. g., Sierra Match King, Berger Match, etc.).[/INDENT]
Rationale: This threshold requirement establishes a relationship between bullet velocity, mass and diameter when standard bullets are used. The thickness specified is approximately the total thickness obtained when the three plates of the target defined in STANAG 4498 (NATO Medium Truck). The bullet selection is restricted to permit a near-standard comparison across calibers and to establish a minimum cartridge size for barrel length. The performance of the open tip match bullet on this target is presumed to match that of classic lead-filled full-metal jacketed bullets. The match bullets are specified to provide a wide variety of bullet weights while maintaining a standard bullet design class.
Objective 1: Spaced Steel plate defeat
[INDENT]Equal or exceed the range at which the 7.62mm M80 round or the 5.56 M855 round from a 20" barrel can perforate the STANAG 4498 target at when the bullet impacts at 45 degrees from normal when using any bullet design with the mass and velocity established by meeting threshold with the standard bullet.[/INDENT]
Rationale: Meeting the threshold with the open tip match bullet as specified is the first step in a multistep design. Perforating the spaced plate at an angle is a significant increase in challenge. This added challenge may be met by upgrading the bullet design from open tip match to one that coincidentally more nearly satisfies the intent spelled out in the Hague and Geneva conventions relating to military small arms
Objective 2: Windshield defeat
[INDENT]Equal or exceed the range at which the 7.62mm M80 round or the 5.56 M855 round from a 20" barrel can defeat the target spelled out in "FBI Test 6" when using any bullet design with the mass and velocity established by meeting threshold with the standard bullet.[/INDENT]
Rationale: This objective completes the vehicular defeat requirements spelled out above. As in Objective 1, this added challenge may be met by upgrading the bullet design from open tip match to one that coincidentally more nearly satisfies the intent spelled out in the Hague and Geneva conventions relating to military small arms
Objective 3: SAPI Defeat
[INDENT]Defeat the NIJ Level III target with one fair hit when using any bullet design with the mass and velocity established by meeting threshold with the standard bullet.[/INDENT]
Rationale: Level III armor is designed to absorb as many as six fair hits of the M80 bullet at 2780 ft/sec prior to failure.
References:
A discussion of SAPI plates is here - http://en.wikipedia.org/wiki/Small_Arms_...ive_Insert
NIJ Standard-0101.05 is defined here: http://www.ncjrs.gov/pdffiles1/nij/223054.pdf and specifies protection level
FBI Test 6 spelled out here: http://greent.com/40Page/general/fbitest.htm
[INDENT]Equal or exceed the range at which the 7.62mm M80 round or the 5.56 M855 round from a 20" barrel can perforate a 3.5 mm (10 gauge) steel plate when using an open tip match bullet (E. g., Sierra Match King, Berger Match, etc.).[/INDENT]
Rationale: This threshold requirement establishes a relationship between bullet velocity, mass and diameter when standard bullets are used. The thickness specified is approximately the total thickness obtained when the three plates of the target defined in STANAG 4498 (NATO Medium Truck). The bullet selection is restricted to permit a near-standard comparison across calibers and to establish a minimum cartridge size for barrel length. The performance of the open tip match bullet on this target is presumed to match that of classic lead-filled full-metal jacketed bullets. The match bullets are specified to provide a wide variety of bullet weights while maintaining a standard bullet design class.
Objective 1: Spaced Steel plate defeat
[INDENT]Equal or exceed the range at which the 7.62mm M80 round or the 5.56 M855 round from a 20" barrel can perforate the STANAG 4498 target at when the bullet impacts at 45 degrees from normal when using any bullet design with the mass and velocity established by meeting threshold with the standard bullet.[/INDENT]
Rationale: Meeting the threshold with the open tip match bullet as specified is the first step in a multistep design. Perforating the spaced plate at an angle is a significant increase in challenge. This added challenge may be met by upgrading the bullet design from open tip match to one that coincidentally more nearly satisfies the intent spelled out in the Hague and Geneva conventions relating to military small arms
Objective 2: Windshield defeat
[INDENT]Equal or exceed the range at which the 7.62mm M80 round or the 5.56 M855 round from a 20" barrel can defeat the target spelled out in "FBI Test 6" when using any bullet design with the mass and velocity established by meeting threshold with the standard bullet.[/INDENT]
Rationale: This objective completes the vehicular defeat requirements spelled out above. As in Objective 1, this added challenge may be met by upgrading the bullet design from open tip match to one that coincidentally more nearly satisfies the intent spelled out in the Hague and Geneva conventions relating to military small arms
Objective 3: SAPI Defeat
[INDENT]Defeat the NIJ Level III target with one fair hit when using any bullet design with the mass and velocity established by meeting threshold with the standard bullet.[/INDENT]
Rationale: Level III armor is designed to absorb as many as six fair hits of the M80 bullet at 2780 ft/sec prior to failure.
References:
A discussion of SAPI plates is here - http://en.wikipedia.org/wiki/Small_Arms_...ive_Insert
NIJ Standard-0101.05 is defined here: http://www.ncjrs.gov/pdffiles1/nij/223054.pdf and specifies protection level
FBI Test 6 spelled out here: http://greent.com/40Page/general/fbitest.htm