View the Notes below the table.
Balistix RBT Ultra Hunt BC & Twist Rate
| Calibre | Bullet Weight | Bullet Type | G1 BC | G7 BC | Barrel Twist Rate (Typical) |
Stability Factor (SG) Sea Level @20DegC |
Stability Factor (SG) Highveld (1400m) @ 20DegC |
|---|---|---|---|---|---|---|---|
| .308″ | 155gr | RBT Ultra Hunt | 0.31 | 0.15 | 12 | 1.57 | 1.85 |
| .308″ | 165gr | RBT Ultra Hunt | 0.34 | 0.17 | 11 | 1.77 | 2.07 |
| .308″ | 175gr | RBT Ultra Hunt | 0.35 | 0.17 | 10 | 1.99 | 2.36 |
| .323″ / 8mm | 200gr | RBT Ultra Hunt | 0.45 | 0.22 | 10 | 1.98 | 2.34 |
| .338″ | 250gr | RBT Ultra Hunt | 0.42 | 0.21 | 10 | 1.91 | 2.26 |
| .365″ / 9.3mm | 230gr | RBT Ultra Hunt | 0.31 | 0.15 | 14 | 1.94 | 2.3 |
| .375″ | 250gr | RBT Ultra Hunt | 0.33 | 0.16 | 12 | 2.07 | 2.45 |
1. Bullet Manufacturing
- Consistent geometry (CNC manufactured).
- Mid SAAMI tolerance on diameter (± 3,5 Micron (µm) maximum on manufacturing).
2. Technical Features of Bullet
2.1 Material
- Pure copper (>99,5% copper).
- Environmentally friendly (lead free).
- Aligned with international trends (embargo on leaded ammunition).
- Specific gravity of pure copper is 10 – 15% less than equivalent lead core bullets. The monolithic bullet is lighter than the equivalent length lead core bullet, therefore increased velocity is achievable.
- By selecting the appropriate monolithic bullet for a given twist rate, a flatter trajectory may be achievable compared to the lead core alternative. Follow manufacturer’s recommendation on selecting an appropriate bullet weight for the rifle’s twist rate.
2.2 Rebated Boat Tail
- Deflected gas flow away from the bullet during bullet exit at crown, ensuring less turbulent gas conditions in front of the bullet.
- Up to 15% increase in precision and accuracy compared to conventional boat tail design.
- Flat base bullet precision and accuracy with boat tail BC benefits.
- Boat tail angle conforms to the popular industrial standard for optimised BC.
2.3 Ogive
- Tangent Ogive design which is less “jump” sensitive.
- Ogive is not off a “bore rider” design, i.e. the ogive engages with the lands.
- Bullet is “tunable” for precision (i.e. jump adjustable).
- Bullet position in case can be measured with ogive comparator tools.
- Both a “target” and “hunting” ogive designs available. Same impact point.
2.4 Bearing Surface
- Designed within SAAMI tolerances.
- Improved low friction drive band design which results in:
– Minimum copper fouling
– Low pressure characteristics
3. Hexagonal Boron Nitrate (HBN)
Hexagonal Boron Nitrate is widely used in industrial applications due to its excellent dry lubricating properties and ultra-high-temperature abilities. Hexagonal Boron Nitrate has the best combination of high temperature resistance and lubricating properties, out of all solid lubricants available today.
3.1 Excellent Lubrication
- HBN application results in less fouling and less pressure compared to untreated monolithic bullets.
- Reduced extreme velocity spread and therefore improved precision and accuracy.
- Improved accuracy between cold bore and follow-up shots. Further reduces elevation dispersion.
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