458620SP299 Technical Profile © Application: Target/Tactical

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: 620gr 40.2g Bullets are guaranteed to weigh within a quarter percent of the stated weight.
Bullet Length: 2.50" 63.500 mm
Secant Ogive Length: 1.25" 31.743 mm These dimensions are critical to consistent external ballistic performance and are held constant to within 0.005 mm (0.0002")
Meplat Diameter: 0.05" 1.143 mm
Min Bullet Protrusion: 1.34" 33.950 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: 1.77" 45.000 mm
CIP and SAAMI cartridge overall length (COL) not observed or does not apply. Check the COL of your rifle for suitability with this bullet as described above. Check the magazine length of your rifle for suitability with this bullet.
Maximum M/V: 3150fps 960 m/s If the maximum muzzle speed is exceeded, dynamic stabilty problems may be encountered.
       

Twist Rates are guidelines but the Minimum Twist must be observed 
Twist: Sg = 1.4: 12.5" / 317 mm 27.7 Calibers The twist required to give a calculated Sg 1.4
Minimum Twist: 13.5" / 342.9 mm 30.0 Calibers The slowest twist required for stable flight and the best long range tractability more than 900 yds or 830 m. See the 'Notes' below.

Calculated Ballistic Coefficient - Standard Metro G1 profile. Based on: Cd = 0.193

BC = 1.060 Maximum M/V to 2175 fps Maximum M/V to 663 m/s Any comparison with the BC values of other manufacturers is not valid as there is currently no standard method in use between manufacturers.  These BC values are only for use in an external ballistics program. Use the three values, as given, to approximately calculate BC for your launch speed and distance. For exact numbers, shoot drop tables at the elevation and temperature for your location.
BC = 0.979 2175 fps to 1200 fps 663 m/s to 366 m/s
BC = 0.738 1200 fps to 0 fps 366 m/s to 0 m/s

Suitable Cartridges, with consideration of the above specifications:

460 Steyr, - Use the specification sheet above to determine whether this bullet is suitable for the cartridge in which you want to use it, if it is not listed.

NOTES
A Gyroscopic Stability (Sg) greater than 1.2 is required for SP bullets. For use under 600yds/550m an Sg of up to 1.5 or even greater can be used. For distances beyond 600yds/550m, the Sg can be decreased with a slower twist, but never less than 1.2 for GSC SP 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.