|
|
|
|
|
257100HV054 Technical Profile | |||
Bore Diameter: |
0.250" |
6.350 mm |
The diameter of the barrel from land to land. |
Groove Diameter: |
0.257" |
6.530 mm |
The diameter of the barrel from groove to groove. |
Bullet Weight: |
100gr |
6.5g |
Bullets are guaranteed to weigh within 0.25% of the stated weight. |
Bullet Length: |
1.28" |
32.400 mm | |
Ogive Length: |
0.71" |
18.125 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 Protrusion: |
0.79" |
19.980 mm |
Add the case length to these numbers to determine the maximum and minimum cartridge overall length that is possible with this bullet. |
Max Protrusion: |
1.02" |
26.000 mm | |
Bullet does not conform to CIP and SAAMI for magazine length. |
Check the magazine length of your rifle for suitability with this bullet. | ||
Max Launch Speed: |
4000fps |
1,219 m/s |
If the launch speed is exceeded, dynamic stabilty problems may be encountered |
Minimum Twist: |
9" |
36.0 Cal |
The twist required for stable flight and good long range terminal performance. |
Sg = 1.5: |
Twist = 7.8 |
Twist = 31.3 Cal |
General hunting twist requirement. |
Short Range Twist: |
7" or tighter |
28.7 Cal or tighter |
Twist requirement 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 = 0.489 |
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. |
BC = 0.427 |
2800 fps to 1600 fps |
853 m/s to 488 m/s | |
BC = 0.415 |
1600 fps to 0 fps |
488 m/s to 0 m/s | |
Suitable Cartridges, with consideration of the above specifications: | |||
25-06, 257 Weatherby and other suitable cartridges | |||