Load Specifications
Load data in caliber .257 Weath. Mag. with .257 | 60gr | Winchester Hollow Point bullet and 89 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and Alliant Reloder-16.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 82% | 55,143 psi | 86% | 3904 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 54,998 psi | 86% | 3917 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,926 psi | 86% | 3970 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 54,926 psi | 86% | 3970 fps | 100% |
| Accurate 4064 | <<locked>> | 88% | 55,172 psi | 86% | 3970 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 56,550 psi | 89% | 4049 fps | 98.8% |
| ADI AR 2206H | <<locked>> | 84% | 54,737 psi | 86% | 4003 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 90% | 56,318 psi | 88% | 4003 fps | 99.1% |
| ADI Benchmark 8208 | <<locked>> | 84% | 57,014 psi | 89% | 4012 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 82% | 54,259 psi | 85% | 3937 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,317 psi | 87% | 4134 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 56,666 psi | 89% | 4029 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 88% | 57,000 psi | 89% | 4055 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 98% | 57,188 psi | 90% | 4131 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 92% | 55,172 psi | 86% | 4101 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,309 psi | 69% | 3816 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,474 psi | 81% | 4045 fps | 98.1% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,114 psi | 86% | 3999 fps | 98.7% |
| Bofors RP3 | <<locked>> | 88% | 53,954 psi | 85% | 3973 fps | 99.7% |
| Bofors RP7 | <<locked>> | 94% | 57,551 psi | 90% | 3996 fps | 96% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,940 psi | 86% | 3934 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 84% | 57,595 psi | 90% | 4042 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 56,579 psi | 89% | 4012 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,752 psi | 86% | 3980 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 92% | 56,869 psi | 89% | 4065 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 84% | 55,288 psi | 87% | 4019 fps | 99.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 57,392 psi | 90% | 4029 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,869 psi | 88% | 4052 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 94% | 56,565 psi | 89% | 4062 fps | 96.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,404 psi | 55% | 2697 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,492 psi | 87% | 3999 fps | 99.6% |
| IMR 3031 | <<locked>> | 88% | 57,609 psi | 90% | 4058 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,839 psi | 86% | 3967 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 92% | 57,580 psi | 90% | 3986 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,680 psi | 87% | 3963 fps | 96.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,940 psi | 85% | 3973 fps | 98.5% |
| IMR 4895 | <<locked>> | 86% | 54,824 psi | 86% | 4029 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 84% | 57,014 psi | 89% | 4012 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 84% | 55,143 psi | 86% | 3973 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 57,435 psi | 90% | 3986 fps | 99.6% |
| Lovex S062 | <<locked>> | 88% | 55,550 psi | 87% | 3983 fps | 99.9% |
| Lovex S065 | <<locked>> | 94% | 55,579 psi | 87% | 3960 fps | 97.6% |
| Lovex S070 | <<locked>> | 96% | 56,782 psi | 89% | 3996 fps | 96.8% |
| Norma 201 | <<locked>> | 86% | 57,014 psi | 89% | 4006 fps | 99.9% |
| Norma 202 | <<locked>> | 84% | 53,998 psi | 85% | 3947 fps | 100% |
| Norma 203B | <<locked>> | 88% | 56,260 psi | 88% | 4039 fps | 99.5% |
| Norma URP | <<locked>> | 96% | 55,100 psi | 86% | 4029 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 88% | 57,740 psi | 90% | 4062 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 96% | 54,534 psi | 85% | 4009 fps | 97.1% |
| Ramshot TAC | <<locked>> | 82% | 54,128 psi | 85% | 3937 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,824 psi | 84% | 3967 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,723 psi | 56% | 2753 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,042 psi | 86% | 3950 fps | 96.8% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 53,809 psi | 84% | 4062 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,346 psi | 85% | 4104 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,724 psi | 89% | 4062 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,898 psi | 88% | 4098 fps | 98.5% |
| Rottweil R 901 | <<locked>> | 84% | 57,551 psi | 90% | 4003 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 57,580 psi | 90% | 4003 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 90% | 54,012 psi | 85% | 3967 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 94% | 57,551 psi | 90% | 3996 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,579 psi | 87% | 3960 fps | 97.6% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,143 psi | 86% | 3973 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,550 psi | 87% | 3983 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 96% | 56,782 psi | 89% | 3996 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,985 psi | 88% | 4035 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,536 psi | 89% | 3986 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 57,232 psi | 90% | 4026 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,375 psi | 85% | 3878 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,405 psi | 87% | 3865 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,840 psi | 88% | 3891 fps | 96.4% |
| Somchem S335 | <<locked>> | 86% | 57,682 psi | 90% | 3927 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,159 psi | 88% | 3973 fps | 99.4% |
| Somchem S355 | <<locked>> | 90% | 53,896 psi | 84% | 3960 fps | 99.5% |
| Somchem S365 | <<locked>> | 98% | 54,027 psi | 85% | 4039 fps | 100% |
| Unknown powder | <<locked>> | 94% | 56,072 psi | 88% | 4045 fps | 98.2% |
| Vihtavuori N130 | <<locked>> | 82% | 56,072 psi | 88% | 3891 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 57,537 psi | 90% | 3917 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 57,580 psi | 90% | 3973 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 57,725 psi | 90% | 3970 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,767 psi | 87% | 3947 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,782 psi | 89% | 4006 fps | 98.7% |
| Vihtavuori N530 | <<locked>> | 82% | 56,623 psi | 89% | 4026 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 88% | 57,740 psi | 90% | 3996 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,058 psi | 89% | 4065 fps | 98.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,458 psi | 78% | 3930 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,505 psi | 85% | 3914 fps | 99.8% |
| Winchester 760 | <<locked>> | 92% | 56,869 psi | 89% | 4065 fps | 96.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,161 psi | 63% | 3809 fps | 98.3% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 51,605 psi | 81% | 3842 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,817 psi | 70% | 3720 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,126 psi | 80% | 3894 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,126 psi | 80% | 3894 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 42,279 psi | 66% | 3698 fps | 99.7% |
| Accurate 4350 | <<locked>> | 88% | 42,134 psi | 66% | 3724 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 47,892 psi | 75% | 3852 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 80% | 40,553 psi | 64% | 3632 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,951 psi | 78% | 3871 fps | 99.3% |
| Alliant AR-Comp | <<locked>> | 80% | 50,589 psi | 79% | 3875 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,338 psi | 69% | 3871 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,596 psi | 64% | 3665 fps | 97.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,526 psi | 68% | 3750 fps | 96.6% |
| Alliant Reloder-16 | 62 gr | 88% | 41,060 psi | 64% | 3740 fps | 95.3% |
| Alliant Reloder-17 | 62.2 gr | 82% | 38,247 psi | 60% | 3678 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 94% | 36,289 psi | 57% | 3583 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 44,034 psi | 69% | 3862 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,834 psi | 75% | 3839 fps | 97.3% |
| Bofors RP3 | <<locked>> | 80% | 40,756 psi | 64% | 3668 fps | 97.4% |
| Bofors RP7 | <<locked>> | 92% | 53,925 psi | 85% | 3924 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,619 psi | 81% | 3868 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 49,864 psi | 78% | 3888 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 80% | 52,939 psi | 83% | 3944 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 44,483 psi | 70% | 3747 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 90% | 52,997 psi | 83% | 3980 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 48,399 psi | 76% | 3871 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 35,360 psi | 55% | 3514 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,206 psi | 66% | 3747 fps | 97.8% |
| Hodgdon Superformance | <<locked>> | 92% | 52,373 psi | 82% | 3976 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,237 psi | 41% | 2434 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,772 psi | 67% | 3711 fps | 97.4% |
| IMR 3031 | <<locked>> | 80% | 44,092 psi | 69% | 3793 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,624 psi | 62% | 3606 fps | 95.4% |
| IMR 4166 Enduron | <<locked>> | 90% | 54,027 psi | 85% | 3914 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 52,286 psi | 82% | 3894 fps | 95.3% |
| IMR 4831 | <<locked>> | 92% | 41,350 psi | 65% | 3681 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 44,643 psi | 70% | 3799 fps | 97.5% |
| IMR 8208 XBR | <<locked>> | 80% | 49,951 psi | 78% | 3871 fps | 99.3% |
| Lovex D073.6 | <<locked>> | 80% | 47,790 psi | 75% | 3825 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 47,529 psi | 74% | 3776 fps | 98.2% |
| Lovex S062 | <<locked>> | 80% | 42,815 psi | 67% | 3701 fps | 98.2% |
| Lovex S065 | <<locked>> | 88% | 45,629 psi | 72% | 3740 fps | 95.1% |
| Lovex S070 | <<locked>> | 92% | 49,908 psi | 78% | 3852 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 46,920 psi | 74% | 3799 fps | 99% |
| Norma 202 | <<locked>> | 80% | 47,355 psi | 74% | 3812 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,917 psi | 67% | 3734 fps | 97% |
| Norma URP | <<locked>> | 88% | 41,829 psi | 66% | 3720 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 43,163 psi | 68% | 3743 fps | 97% |
| Ramshot Hunter | <<locked>> | 92% | 47,311 psi | 74% | 3852 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 50,618 psi | 79% | 3862 fps | 96.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,270 psi | 79% | 3891 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,600 psi | 42% | 2490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 51,416 psi | 81% | 3878 fps | 95.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,470 psi | 73% | 3894 fps | 97.2% |
| ReloadSwiss RS 60 | 60.7 gr | 80% | 37,884 psi | 59% | 3694 fps | 98.4% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 42,322 psi | 66% | 3737 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 44,875 psi | 70% | 3835 fps | 95.5% |
| Rottweil R 901 | <<locked>> | 80% | 50,604 psi | 79% | 3868 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,599 psi | 70% | 3730 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 80% | 38,087 psi | 60% | 3586 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 92% | 53,925 psi | 85% | 3924 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 45,629 psi | 72% | 3740 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,790 psi | 75% | 3825 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 42,815 psi | 67% | 3701 fps | 98.2% |
| Shooters World SW4350 | <<locked>> | 92% | 49,908 psi | 78% | 3852 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,276 psi | 62% | 3642 fps | 95.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,936 psi | 77% | 3825 fps | 96.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,644 psi | 73% | 3802 fps | 97.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,863 psi | 75% | 3750 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,045 psi | 63% | 3550 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 52,257 psi | 82% | 3819 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 47,747 psi | 75% | 3740 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,646 psi | 76% | 3822 fps | 98.4% |
| Somchem S355 | <<locked>> | 80% | 38,769 psi | 61% | 3599 fps | 96.2% |
| Somchem S365 | <<locked>> | 84% | 32,619 psi | 51% | 3484 fps | 95.3% |
| Unknown powder | <<locked>> | 88% | 45,411 psi | 71% | 3809 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 52,779 psi | 83% | 3832 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,889 psi | 70% | 3681 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,106 psi | 69% | 3717 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,193 psi | 69% | 3707 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 32,996 psi | 52% | 3396 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 86% | 42,786 psi | 67% | 3694 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 52,765 psi | 83% | 3950 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 44,237 psi | 69% | 3720 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 43,279 psi | 68% | 3750 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 94% | 39,914 psi | 63% | 3691 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 35,549 psi | 56% | 3458 fps | 95.6% |
| Winchester 760 | <<locked>> | 90% | 52,997 psi | 83% | 3980 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 34,998 psi | 55% | 3619 fps | 95.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 111 powders for .257 Weath. Mag. loaded with the .257 | 60gr | Winchester Hollow Point. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 4,134 fps; across all powders the maximum-charge window runs from 2,697 fps to 4,134 fps. Accurate 3100 gives the best case fill at 100 %, and 111 of the 111 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 60.0 gr projectile in 0.257" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. ReloadSwiss RS 60, Alliant Reloder-17, Alliant Reloder-16 rank at the top here: for .257 Weath. Mag. with the .257 | 60gr | Winchester Hollow Point they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, Alliant Reloder-19, Alliant Reloder-22 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.