243075HV046 Technical Profile    Application: General Hunting

Bore Diameter: 0.237" 6.020 mm The diameter of the barrel from land to land.
Groove Diameter: 0.243" 6.170 mm The diameter of the barrel from groove to groove.
Bullet Weight: 75gr 4.9g Bullets are guaranteed to weigh within 0.25% of the stated weight.
Bullet Length: 1.07" 27.300 mm
Secant Ogive Length: 0.58" 14.818 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: 0.65" 16.420 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: 0.79" 20.000 mm
Bullet conforms to CIP and SAAMI for magazine length. Check the magazine length of your rifle for suitability with this bullet.
Maximum M/V: 4000fps 1,219 m/s If the launch speed is exceeded, dynamic stabilty problems may be encountered
Minimum Twist: 9" / 228.6 mm 38.0 Calibers in length The slowest twist required for stable flight and good long range terminal performance.
Twist: Sg = 1.5: 8.0" / 210 mm 34.8 Cal. in length General hunting twist for average distances.
Short Range Twist: 7.6" / 192 mm or tighter 31.9 Cal/length or tighter Twist recommended if hunting distances do not exceed 150 meters/yards.
Minimum Impact Speed: 1600fps 488 m/s At this impact speed, the bullet will open to at least double caliber.
Calculated Ballistic Coefficient - G1 profile  
BC = 0.361 4000 fps to 2800 fps 1,219 m/s to 853 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 = 0.321 2800 fps to 1600 fps 853 m/s to 488 m/s
BC = 0.315 1600 fps to 0 fps 488 m/s to 0 m/s

Suitable Cartridges, with consideration of the above specifications:

6x47 SM, 6mm BR Rem, 6mm BR Norma, 6mmRem.


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.