458500FN089 Technical Profile    Application: Hunting (Solid)

Barrel Bore Diameter: 0.450" 11.430 mm The diameter of the barrel from land to land.
Barrel Groove Diameter: 0.458" 11.630 mm The diameter of the barrel from groove to groove.
Bullet Weight: 500gr 32.4g Bullets are guaranteed to weigh within 0.25% of the stated weight.
Bullet Length: 1.47" 37.250 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: 0.24" 6.200 mm
Min Bullet Protrusion: 0.68" 17.210 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: 1.22" 31.000 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: 17" / 431.8 mm 37.78 Calibers For linear penetration, select a bullet that meets or exceeds the minimum recommended twist rate.

Calculated Ballistic Coefficient - G1 profile

BC = 0.202 3400 fps to 2300 fps 1,036 m/s to 701 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 = 0.188 2300 fps to 1200 fps 701 m/s to 366 m/s
BC = 0.222 1200 fps to 0 fps 366 m/s to 0 m/s

Suitable Cartridges, with consideration of the above specifications:

450 Rigby, 460 Weath Mag.


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.