6 mm caliber .25in (6.5mm) .25in (6.5mm)

| Name_ | Bullet | Length_ | Base | Shoulder | Neck |
|---|---|---|---|---|---|
| .25-20 Winchester | 6.55 (.258) | 33.78 (1.33) | 8.86 (.349) | 8.46 (.333) | 6.96 (.274) |
| .25-35 Winchester | 6.55 (.258) | 51.89 (2.043) | 10.73 (.422) | 9.26 (.365) | 7.15 (.282) |
| .250-3000 Savage | 6.553 (.258) | 48.46 (1.912) | 11.91 (.469) | 10.51 (.414) | 7.26 (.286) |
| .257 Roberts | 6.553 (.258) | 56.72 (2.233) | 11.99 (.427) | 10.92 (.430) | 7.36 (.290) |
| .25-06 Remington | 6.541 (.2575) | 63.35 (2.494) | 11.94 (.470) | 11.20 (.441) | 7.37 (.290) |
| .257 Weatherby Magnum | 6.5 (.257) | 65.0 (2.560) | 13.1 (.514) | 12.6 (.496) | 7.3 (.288) |
| .256 Win Magnum | 6.528 (.257) | 32.54 (1.281) | 9.677 (.381) | 9.347 (.368) | 6.528 (.257) |