4 of 4 .257 Wby Mag factory loads carry 800 ft·lb and expansion velocity for pronghorn; the best reach 750 yd (Hornady Precision Hunter 110 gr ELD-X). Ranked, with the drop chart for each.
| Load | gr | Max ethical yd | MV fps | 500 yd ft·lb | Shoulder shot |
|---|---|---|---|---|---|
| Hornady Precision Hunter 110 gr ELD-X | 110 | 750 | 3,240 | 1,233 | yes |
| Nosler Trophy Grade 110 gr AccuBond | 110 | 700 | 3,400 | 1,252 | yes |
| Hornady Outfitter 90 gr CX | 90 | 450 | 3,625 | 735 | yes |
| Norma 100 gr Whitetail SP | 100 | 400 | 3,510 | 682 | behind the shoulder only |
Chuck Hawks: ~800 ft·lb at impact with a .24″+ bullet of SD ≥ .215. Legal: CO: 1,000 ft·lb at 100 yd (rifle). Floor used: 800 ft·lb at impact plus the bullet's published expansion velocity. Orange = a target or varmint bullet (construction, not energy); red = never carries the energy. Sources: www.chuckhawks.com, cpw.state.co.us.