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284130HV065 Technical Profile © | |||
| Bore Diameter: | 0.277" | 7.040 mm | The diameter of the barrel from land to land. |
| Groove Diameter: | 0.284" | 7.210 mm | The diameter of the barrel from groove to groove. |
| Bullet Weight: | 130gr | 8.4g | Bullets are guaranteed to weigh within 0.25% of the stated weight. |
| Bullet Length: | 1.29" | 32.800 mm | |
| Ogive Length: | 0.71" | 18.000 mm | These dimensions are critical to consistent external ballistic performance and are held constant to within 0.005 mm (0.0002") |
| Meplat Diameter: | 0.09" | 2.200 mm | |
| Min Bullet Protrusion: | 0.78" | 19.800 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: | 0.94" | 24.000 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: | 4300fps | 1,311 m/s | If the launch speed is exceeded, dynamic stabilty problems may be encountered |
| Minimum Twist: | 10" / 254 mm | 36.1 Calibers in length | The slowest twist required for stable flight and good long range terminal performance. |
| Twist Sg = 1.5: | 9.0" / 224 mm | 31.9 Cal. in length | General hunting twist for average distances. |
| Short Range Twist: | 8" / 208 or tighter | 29.6 Cal/length or tighter | Twist recommended if hunting distances do not exceed 150 meters. |
| 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 = 0.419 | 4300 fps to 2950 fps | 1,311 m/s to 899 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 = 0.373 | 2950 fps to 1600 fps | 899 m/s to 488 m/s | |
| BC = 0.377 | 1600 fps to 0 fps | 488 m/s to 0 m/s | |
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Suitable Cartridges, with consideration of the above specifications: | |||
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7mmB.R. Rem., 7mmExp. Rem., 7mmKM, 7mmRem.08, 7mmRem Mag., 7mmRemUltra Mag.7-30 Waters | |||
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NOTES | |||
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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. | |||
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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. | |||
