308180FN021 Technical Profile    Application: Dangerous Game Hunting

Barrel Bore Diameter: 0.300" 7.620 mm The diameter of the barrel from land to land.
Barrel Groove Diameter: 0.308" 7.820 mm The diameter of the barrel from groove to groove.
Bullet Weight: 180gr 11.7g Bullets are guaranteed to weigh within 0.25% of the stated weight.
Bullet Length: 1.23" 31.190 mm
Conical Ogive Length 0.59" 15.000 mm These dimensions are critical to consistent external ballistic performance and are held constant to within 0.005 mm (0.0002")
Meplat Diameter: 0.16" 4.100 mm
Min Bullet Protrusion: 0.67" 17.060 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: 1.06" 27.000 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: 3400fps 1 036 m/s If the maximum muzzle speed is exceeded, dynamic stabilty problems may be encountered.
Minimum Twist rate: 8.75" / 222.25 mm 29.17 Calibers For linear penetration, select a bullet that meets the minimum recommended twist rate or is tighter (smaller number).

Calculated Ballistic Coefficient - G1 profile

BC = 0.184 Maximum to 2300 fps Maximum to 701 m/s BC values are calculated at standard Metro values using a G1 profile.  Any comparison with the BC values of other manufacturers is not valid as there is currently no standard method in use between manufacturers.  Enter these values into an external ballistics program to calculate BC for your launch speed and distance. For excact values, shoot drop tables at the elevation and temperature for your location.
BC = 0.175 2300 fps to 1200 fps 701 m/s to 366 m/s
BC = 0.200 1200 fps to 0 fps 366 m/s to 0 m/s

Suitable Cartridges, with consideration of the above specifications:

All .308" Calibers subject to twist


A Gyroscopic Stability (Sg) greater than 2.0 is preferred for FN bullets.

*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.