.308 cal
One of the original dies included in the purchase of Spencer bullets. Our .308 bullet is built using Niemi Dies and has won 1,000 yard IBS National titles like many of our bullets.
Bullet:
Boat Tail Hollow Point
Grain:
204 Grain
G1 BC:
.602
G7 BC:
.309
G7 Form Factor:
1.009
Ogive Radius:
12.74 calibers
Sectional Density:
0.312 lb/in²
Rt/R:
0.63
Vapor Trail .308 caliber 207 grain BTHP
| Lot #: unknown | Ogive Radius: 12.74 calibers |
| Sectional Density: 0.312 lb/in² | Rt/R: 0.63 |
Ballistic Performance
| Above 3000 | 3000-2500 | 2500-2000 | 2000-1500 | Below 1500 | |
|---|---|---|---|---|---|
| G1 BC | 0.652 | 0.623 | 0.608 | 0.581 | 0.558 |
| G7 BC | 0.309 | 0.309 | 0.306 | 0.309 | 0.314 |
Averages from 3000 fps to 1500 fps:
G1 BC: 0.602, variation of G1 BC: 0.076
G7 BC: 0.309, variation of G7 BC: 0.011
G7 form factor: 1.009
Rifling Twist Rate and Stability
| Barrel Twist | Best Case | Stability Factor Nominal | Worst Case |
|---|---|---|---|
| 1:10" | 2.10 | 1.84 | 1.59 |
| 1:11" | 1.74 | 1.52 | 1.31 |
| 1:12" | 1.46 | 1.28 | 1.10 |
| 1:13" | 1.24 | 1.09 | .94 |
Minimum twist required for stability is 1:1204″
Recommended twist for optimal performance is 1:11.1″ or faster