| LoadID | 7780 |
| Bullet | Magma .403 cast |
| Bullet Weight | 180 grs |
| Powder | IMR-4759 |
| Powder Weight | 13.2 grs |
| Primer | CCI-350 MAG |
| Brass Make | Star-Line |
| Barrel Length | 24 (inches) |
| C.O.L | 1.588 (inches) |
| Velocity | 995 fps |
| Group 100 yds | 12 (inches) |
| Submitted By | Float Pilot |
| Gun Info | Original 1892 Winchester mader in 1892. |
| Comment | SUPER DIRTY, all sorts of unburned powder falls out of case. Huge group. Seems like a bad idea for this cartridge. |