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312186HV290 Technical Profile © APPLICATION: Long Range Hunting

Bore Diameter: 0.300" 7.620 mm The diameter of the barrel from land to land.

Groove Diameter: 0.312" 7.920 mm The diameter of the barrel from groove to groove.

Bullet Weight: 186gr 12.1g Bullets are guaranteed to weigh within 0.25% of the stated weight.

Bullet Length: 1.69" 43.000 mm

Ogive Length: 0.96" 24.439 mm These dimensions are critical to consistent external ballistic performance and are held constant to within 0.005 mm (0.0002")

Meplat Diameter: 0.06" 1.650 mm

Min Bullet Protrusion: 1.07" 27.300 mm Add the case length to these numbers to determine the maximum and minimum cartridge overall length that is possible with this bullet.

Max Bullet Protrusion: 1.30" 33.000 mm

Bullet does not conform to CIP and SAAMI for magazine length. Check the magazine length of your rifle for suitability with this bullet.

Maximum M/V: 4300fps 1,311 m/s If the launch speed is exceeded, dynamic stabilty problems may be encountered

Minimum Twist: 9.5" / 241.3 mm 31.7 Calibers in length The slowest twist required for stable flight and good long range terminal performance.

Twist Sg = 1.5: 9.0" / 217 mm 28.5 Cal. in length General hunting twist for average distances.

Short Range Twist: 8" / 192 or tighter 25.2 Cal/length or tighter Twist recommended if hunting distances do not exceed 150 meters.

Minimum Impact Speed: 1500fps 457 m/s At this impact speed, the bullet will open to at least double caliber.

Calculated Ballistic Coefficient - G1 profile

BC = 0.732 4300 fps to 2900 fps 1,311 m/s to 884 m/s BC values are calculated at standard Metro values and serve as a comparison between GSC bullets. Any comparison with the BC values of other manufacturers is not valid as there is currently no standard method in use between manufacturers.

BC = 0.607 2900 fps to 1500 fps 884 m/s to 457 m/s

BC = 0.571 1500 fps to 0 fps 457 m/s to 0 m/s

Suitable Cartridges, with consideration of the above specifications:

7.62x54R Dedicated LRH

NOTES

A Gyroscopic Stability (Sg) greater than 1.1 is required for stable flight with HV and HP bullets. For hunting under 500m, an Sg of up to 1.5 or more can be used. For longer distances the Sg can be decreased but never less than 1.1.

Note that Sg increases as twist tightens. A 1:10" twist is tighter than a 1:12" twist within a given caliber only. Twist rates given in caliber lengths can be compared across calibers. Choose a bullet length best suited to your rifle twist and type of shooting. When a bullet is specified for a given twist rate, it can also be used in any twist that is tighter. Using it in a slower twist than specified is not advisable. Some experimentation will be required to determine exact drop tables for your equipment and location.

312186HV290 Technical Profile © APPLICATION: Long Range Hunting

Bore Diameter:	0.300"	7.620 mm	The diameter of the barrel from land to land.
Groove Diameter:	0.312"	7.920 mm	The diameter of the barrel from groove to groove.
Bullet Weight:	186gr	12.1g	Bullets are guaranteed to weigh within 0.25% of the stated weight.
Bullet Length:	1.69"	43.000 mm
Ogive Length:	0.96"	24.439 mm	These dimensions are critical to consistent external ballistic performance and are held constant to within 0.005 mm (0.0002")
Meplat Diameter:	0.06"	1.650 mm
Min Bullet Protrusion:	1.07"	27.300 mm	Add the case length to these numbers to determine the maximum and minimum cartridge overall length that is possible with this bullet.
Max Bullet Protrusion:	1.30"	33.000 mm
Bullet does not conform to CIP and SAAMI for magazine length.			Check the magazine length of your rifle for suitability with this bullet.
Maximum M/V:	4300fps	1,311 m/s	If the launch speed is exceeded, dynamic stabilty problems may be encountered
Minimum Twist:	9.5" / 241.3 mm	31.7 Calibers in length	The slowest twist required for stable flight and good long range terminal performance.
Twist Sg = 1.5:	9.0" / 217 mm	28.5 Cal. in length	General hunting twist for average distances.
Short Range Twist:	8" / 192 or tighter	25.2 Cal/length or tighter	Twist recommended if hunting distances do not exceed 150 meters.
Minimum Impact Speed:	1500fps	457 m/s	At this impact speed, the bullet will open to at least double caliber.
Calculated Ballistic Coefficient - G1 profile
BC = 0.732	4300 fps to 2900 fps	1,311 m/s to 884 m/s	BC values are calculated at standard Metro values and serve as a comparison between GSC bullets. Any comparison with the BC values of other manufacturers is not valid as there is currently no standard method in use between manufacturers.
BC = 0.607	2900 fps to 1500 fps	884 m/s to 457 m/s
BC = 0.571	1500 fps to 0 fps	457 m/s to 0 m/s
Suitable Cartridges, with consideration of the above specifications:

7.62x54R Dedicated LRH


NOTES
A Gyroscopic Stability (Sg) greater than 1.1 is required for stable flight with HV and HP bullets. For hunting under 500m, an Sg of up to 1.5 or more can be used. For longer distances the Sg can be decreased but never less than 1.1.

Note that Sg increases as twist tightens. A 1:10" twist is tighter than a 1:12" twist within a given caliber only. Twist rates given in caliber lengths can be compared across calibers. Choose a bullet length best suited to your rifle twist and type of shooting. When a bullet is specified for a given twist rate, it can also be used in any twist that is tighter. Using it in a slower twist than specified is not advisable. Some experimentation will be required to determine exact drop tables for your equipment and location.