NGMTC_SPECS_AND_ACCURACY.docx

NGMTC ACCURACY AND CHARACTERISTICS SPECIFICATION SHEET

1. -.223 REMINGTON 55gr, Custom-manufactured ammunition.

-Bullet: 55gr. Sierra Blitzking (#1455). The projectile shall be 0.224 inch diameter.

-Brass & Primer: Manufacturer’s choice best product to achieve safe, accurate, and reliable function of ammunition. Product must be manufactured new brass.

-Powder: The manufacturer shall establish the charge weight to meet performance & accuracy requirements. The average chamber pressure of the sample cartridges conditioned at 70 degrees plus or minus 5 degrees F, shall not exceed 59,000psi. Neither the chamber pressure of an individual sample test cartridge nor the average chamber pressure plus three std deviations of the chamber pressure shall exceed 63,200psi. Port pressure minus three std deviations shall be less than 15,300psi for the sample cartridges conditioned to 70 degrees plus or minus 5 degrees F.

-Cartridge OAL: not to exceed 2.260 inches.

-Muzzle Velocity: Shall average 3000 feet per second (FPS) (plus or minus 15 FPS) when fired from a 16”, 1-7.7 twist rate, 5.56 match grade barrels.

-Accuracy Standards: Average group size 2.5 inches or less at 200 yards when fired from AR-15 match grade test receivers. Accuracy testing will be conducted by NGMTC.

2. -.223 REMINGTON 77gr, Custom-manufactured ammunition.

-Bullet: 77gr. Sierra Hollow Point Boat Tail Matchking (#9377) or 77gr Lapua Scenar-L (#4315015). The projectile shall be 0.224 inch diameter.

-Brass: Lake City mil spec brass with crimped in primers or Lapua Match .223 Rem Brass. Product must be manufactured new brass.

-Powder: The manufacturer shall establish the charge weight to meet performance & accuracy requirements. The average chamber pressure of the sample cartridges conditioned at 70 degrees plus or minus 5 degrees F, shall not exceed 59,000psi. Neither the chamber pressure of an individual sample test cartridge nor the average chamber pressure plus three std deviations of the chamber pressure shall exceed 63,200psi. Port pressure minus three std deviations shall be less than 15,300psi for the sample cartridges conditioned to 70 degrees plus or minus 5 degrees F.

-Cartridge OAL: not to exceed 2.260 inches.

-Muzzle Velocity: Shall average 2850 feet per second (FPS) (plus or minus 15 FPS) when fired from a 20”, 1-7.7 twist rate, 5.56 match grade barrels.

-Accuracy Standards: Average group size 1.5 inches or less at 200 yards when fired from AR-15 match grade test receivers. Accuracy testing will be conducted by NGMTC.

3. -.308 WINCHESTER 185gr, Custom-manufactured ammunition.

-Bullet: 185gr. Berger Juggernaut Target (#30418) or 185gr Lapua Scenar-L. The projectile shall be 0.308 inch diameter.

-Primer & Brass: Lapua Palma .308 Win. Brass with CCI #4 Bench Rest small rifle primer. Product must be manufactured new brass.

-Powder: The manufacturer shall establish the charge weight to meet performance & accuracy requirements. The average chamber pressure of the sample cartridges conditioned at 70 degrees plus or minus 5 degrees F, shall not exceed 59,000psi. Neither the chamber pressure of an individual sample test cartridge nor the average chamber pressure plus three std deviations of the chamber pressure shall exceed 63,000psi. Port pressure minus three std deviations shall be less than 15,300psi for the sample cartridges conditioned to 70 degrees plus or minus 5 degrees F.

-Cartridge OAL: not to exceed 2.915 inches.

-Muzzle Velocity: Shall average 2625 feet per second (FPS) (plus or minus 15 FPS) when fired from a 20”, 1-10 twist rate, .308 match grade barrels.

-Accuracy Standards: Average group size 1.5 inches or less at 200 yards when fired from AR-10 match grade test receivers. Accuracy testing will be conducted by NGMTC.

4. -.308 WINCHESTER 155.5gr, Custom-manufactured ammunition.

-Bullet: 155.5gr. Berger Fullbore Target (#30416). The projectile shall be 0.308 inch diameter.

-Primer & Brass: Lapua Palma .308 Win. Brass with CCI #4 Bench Rest small rifle primer trimmed to SAAMI length. Product must be manufactured new brass.

-Powder: The manufacturer shall establish the charge weight to meet performance & accuracy requirements.

-Cartridge OAL: not to exceed 2.950 inches.

-Muzzle Velocity: Shall average 3000 feet per second (FPS) (plus or minus 15 FPS) when fired from a 30”, 1-10 twist rate, .308 match grade barrels.

-Accuracy Standards: Average group size 1.25 inches or less at 200 yards when fired from match grade bolt action test rifles. Accuracy testing will be conducted by NGMTC.

5. -6.5 Creedmoor 140gr, Custom-manufactured ammunition.

-Bullet: 140gr. Berger Hybrid Target (#30416). The projectile shall be 0.264 inch diameter.

-Primer & Brass: Lapua 6.5 Creedmoor Brass with CCI #4 Bench Rest small rifle primer trimmed to SAAMI length. Product must be manufactured new brass.

-Powder: The manufacturer shall establish the charge weight to meet performance & accuracy requirements.

-Cartridge OAL: not to exceed X.XXX inches.

-Muzzle Velocity: Shall average 2775 feet per second (FPS) (plus or minus 15 FPS) when fired from a 30”, 1-7.75 twist rate, 6.5 Creedmoor match grade barrels.

-Accuracy Standards: Average group size 1.25 inches or less at 200 yards when fired from match grade bolt action test rifles. Accuracy testing will be conducted by NGMTC.

-Ammunition Packaging: NGMTC requests any sample cartridges packaged in cardboard boxes with either plastic or Styrofoam inserts and clearly labeled with caliber, bullet weight, ammunition type, and lot number.

-Functional Characteristics: Ammunition must cycle reliably from NGMTC rifles. There shall be no weapon stoppages due to the cartridges. No failures to extract, no hang fires, no misfires either from primer failure or no vent hole in cartridge. No projectiles shall remain in the bore. There shall be no gas leakage or primer failures due to perforation of primer during firing pin indent, escape of gas through primer cup or around primer cup, no loose primers or blown primers. There shall be no cartridge case casualties due to longitudinal split at any point on case mouth, body, or head. There shall be no cartridge case casualties due to circumferential rupture at any point on the cartridge case mount, body, or head.