.45-70 Government ballistic coefficient chart
G1 and G7 ballistic coefficients for 12 .45-70 Government factory loads from 250 to 450 grains, with the manufacturer's muzzle velocity and, where published, bullet length.
| Load | Weight (gr) | G1 BC | G7 BC | Velocity (fps) | Length (in) |
|---|---|---|---|---|---|
| Hornady 250gr. MONOFLEX LEVERevolution | 250 | 0.175 | - | 2,025 | - |
| Barnes 300gr. VOR-TX (21579) | 300 | 0.163 | - | 1,905 | - |
| Federal 300-grain Speer Hot-Cor SP (4570AS) | 300 | 0.284 | - | 1,880 | - |
| Remington 300-grain Jacketed Hollow Point (R4570L) | 300 | 0.213 | - | 1,810 | - |
| Winchester 300-grain Jacketed Hollow Point (X4570H) | 300 | 0.287 | - | 1,880 | - |
| Winchester 300-grain Partition Gold (SPGX4570) | 300 | 0.215 | - | 1,880 | - |
| Hornady 325gr. FTX LEVERevolution | 325 | 0.230 | - | 2,050 | - |
| Cor-Bon 350-grain BondedCore SP | 350 | 0.213 | - | 1,800 | - |
| PMC 350-grain Flat Nose Soft Point (45-70HA) | 350 | 0.213 | - | 2,025 | - |
| PMC 405-grain LFP (45-70CA) Availability: (Cowboy Action Ammunition) | 405 | 0.301 | - | 1,350 | - |
| Remington 405-grain Soft Point (R4570G) | 405 | 0.281 | - | 1,330 | - |
| Cor-Bon 450-grain FP Penetrator | 450 | 0.280 | - | 1,650 | - |
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.