.257 Weatherby Magnum ballistic coefficient chart
G1 and G7 ballistic coefficients for 13 .257 Weatherby Magnum factory loads from 80 to 120 grains, with the manufacturer's muzzle velocity and, where published, bullet length.
| Load | Weight (gr) | G1 BC | G7 BC | Velocity (fps) | Length (in) |
|---|---|---|---|---|---|
| Weatherby 80gr. TTSX (B25780TTSX) | 80 | 0.316 | - | 3,870 | - |
| Weatherby 87-grain Pointed-Expanding (H 257 87 SP) | 87 | 0.323 | - | 3,825 | - |
| Weatherby 100-grain Pointed-Expanding (H 257 100 SP) | 100 | 0.358 | - | 3,602 | - |
| Weatherby 100gr. SP (H257100SP) | 100 | 0.357 | - | 3,602 | - |
| Weatherby 100gr. SPITZER (G257100SR) | 100 | 0.256 | - | 3,500 | - |
| Weatherby 100gr. TTSX (B257100TTSX) | 100 | 0.357 | - | 3,570 | - |
| Hornady 110gr. ELD-X Precision Hunter (81364) | 110 | 0.465 | 0.234 | 3,240 | 1.480 |
| Weatherby 110gr. Accubond (N257110ACB) | 110 | 0.418 | - | 3,460 | - |
| Federal 115-grain Nosler Partition (P257WBA) | 115 | 0.391 | - | 3,150 | 1.145 |
| Weatherby 115-grain Barnes X-Bullet (B 257 115 XS) | 115 | 0.430 | - | 3,400 | - |
| Weatherby 115gr. Ballistic Tip (N257115BST) | 115 | 0.453 | - | 3,400 | - |
| Weatherby 117-grain Round Nose-Expanding (H 257 117 RN) | 117 | 0.256 | - | 3,402 | - |
| Weatherby 120gr. Partition (N257120PT) | 120 | 0.391 | - | 3,305 | - |
Using these numbers
A ballistic coefficient describes how well a bullet keeps its speed against air resistance, compared with a standard reference projectile. G7 figures suit long, boat-tailed match and hunting bullets and stay more consistent across velocities; G1 figures are larger numbers for the same bullet and are what most manufacturers have published historically. Use whichever your calculator asks for, but never mix a G1 number with the G7 drag model.
Every load here is in the ballistic calculator's bullet library — search for it to build a range card in one step, then true the velocity against your own chronograph.