Load Specifications
Load data in caliber .257 Roberts with .257 | 92gr | Reichenberg Spezial Jagd bullet and 55 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.
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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 45,107 psi | 88% | 2989 fps | 100% |
| Accurate 4064 | <<locked>> | 86% | 45,469 psi | 88% | 3035 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 44,396 psi | 86% | 3074 fps | 96.8% |
| ADI AR 2206H | <<locked>> | 82% | 45,919 psi | 89% | 3048 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 86% | 44,425 psi | 86% | 2995 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 45,034 psi | 87% | 3140 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 43,918 psi | 85% | 3015 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 84% | 44,309 psi | 86% | 3031 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 94% | 43,700 psi | 85% | 3084 fps | 96.8% |
| Alliant Reloder-17 | <<locked>> | 90% | 43,932 psi | 85% | 3117 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,724 psi | 73% | 2956 fps | 96.6% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 45,440 psi | 88% | 3048 fps | 97.2% |
| Bofors RP3 | <<locked>> | 86% | 44,048 psi | 86% | 3028 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 86% | 44,875 psi | 87% | 3028 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 82% | 46,340 psi | 90% | 3061 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 45,847 psi | 89% | 3077 fps | 98.7% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 45,208 psi | 88% | 3084 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,302 psi | 69% | 2005 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 44,585 psi | 87% | 3009 fps | 98.4% |
| IMR 3031 | <<locked>> | 82% | 45,977 psi | 89% | 3068 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 43,714 psi | 85% | 2976 fps | 97.4% |
| IMR 4831 | <<locked>> | 96% | 45,498 psi | 88% | 3077 fps | 97.2% |
| IMR 4895 | <<locked>> | 84% | 45,368 psi | 88% | 3068 fps | 98.2% |
| Lovex D073.6 | <<locked>> | 82% | 45,310 psi | 88% | 3028 fps | 99.8% |
| Lovex S060 | <<locked>> | 82% | 46,238 psi | 90% | 2986 fps | 98.4% |
| Lovex S062 | <<locked>> | 86% | 46,557 psi | 90% | 3038 fps | 99.3% |
| Norma 201 | <<locked>> | 82% | 45,150 psi | 88% | 2999 fps | 99.1% |
| Norma 202 | <<locked>> | 82% | 45,411 psi | 88% | 3012 fps | 100% |
| Norma 203B | <<locked>> | 84% | 43,627 psi | 85% | 3018 fps | 97.8% |
| Norma URP | <<locked>> | 94% | 44,222 psi | 86% | 3068 fps | 96.7% |
| Ramshot Big Game | <<locked>> | 86% | 46,543 psi | 90% | 3094 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,665 psi | 69% | 2051 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 43,584 psi | 85% | 3081 fps | 97.2% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 43,816 psi | 85% | 3130 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 44,150 psi | 86% | 3091 fps | 96.4% |
| Rottweil R 902 | <<locked>> | 84% | 45,484 psi | 88% | 2999 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 88% | 43,903 psi | 85% | 3018 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 45,310 psi | 88% | 3028 fps | 99.8% |
| Shooters World Precision | <<locked>> | 86% | 46,557 psi | 90% | 3038 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 45,426 psi | 88% | 3081 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 44,440 psi | 86% | 3009 fps | 98% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 46,528 psi | 90% | 2956 fps | 100% |
| Somchem S335 | <<locked>> | 82% | 46,195 psi | 90% | 2956 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 46,325 psi | 90% | 3031 fps | 98.3% |
| Somchem S355 | <<locked>> | 88% | 44,556 psi | 87% | 3018 fps | 98.4% |
| Somchem S365 | <<locked>> | 98% | 45,179 psi | 88% | 3133 fps | 99.6% |
| Vihtavuori N135 | <<locked>> | 84% | 45,034 psi | 87% | 2986 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 45,919 psi | 89% | 2995 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 45,730 psi | 89% | 3009 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 94% | 46,383 psi | 90% | 3071 fps | 97.1% |
| Vihtavuori N540 | <<locked>> | 84% | 44,251 psi | 86% | 2979 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 94% | 45,658 psi | 89% | 3071 fps | 96.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,886 psi | 79% | 3045 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 43,642 psi | 85% | 2989 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 82% | 44,019 psi | 85% | 3015 fps | 98.4% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 39,523 psi | 77% | 2877 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 37,347 psi | 73% | 2861 fps | 99.5% |
| Accurate 4350 | <<locked>> | 90% | 38,711 psi | 75% | 2946 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 43,265 psi | 84% | 2992 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 80% | 36,666 psi | 71% | 2815 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 39,146 psi | 76% | 2995 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,143 psi | 70% | 2838 fps | 96.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,030 psi | 76% | 2910 fps | 96% |
| Alliant Reloder-16 | 42.8 gr | 90% | 38,566 psi | 75% | 2956 fps | 95% |
| Alliant Reloder-17 | 43 gr | 84% | 35,766 psi | 69% | 2910 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 35,302 psi | 69% | 2890 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,308 psi | 82% | 2982 fps | 96.4% |
| Bofors RP3 | <<locked>> | 80% | 35,824 psi | 70% | 2838 fps | 96.7% |
| Hodgdon H380 | <<locked>> | 84% | 41,989 psi | 82% | 2966 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 43,671 psi | 85% | 3005 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 35,360 psi | 69% | 2835 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,479 psi | 77% | 2959 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,252 psi | 51% | 1795 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,727 psi | 81% | 2946 fps | 97.8% |
| IMR 3031 | <<locked>> | 80% | 43,149 psi | 84% | 3012 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,450 psi | 75% | 2854 fps | 95.9% |
| IMR 4831 | <<locked>> | 92% | 39,653 psi | 77% | 2949 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 39,987 psi | 78% | 2946 fps | 96.9% |
| Lovex D073.6 | <<locked>> | 80% | 42,351 psi | 82% | 2972 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 43,337 psi | 84% | 2927 fps | 97.8% |
| Lovex S062 | <<locked>> | 80% | 38,392 psi | 75% | 2864 fps | 97.8% |
| Norma 201 | <<locked>> | 80% | 42,279 psi | 82% | 2940 fps | 98.6% |
| Norma 202 | <<locked>> | 80% | 42,453 psi | 82% | 2953 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 38,421 psi | 75% | 2897 fps | 96.4% |
| Norma URP | <<locked>> | 92% | 41,263 psi | 80% | 3005 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 37,811 psi | 73% | 2900 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,382 psi | 51% | 1834 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,596 psi | 79% | 3012 fps | 96.4% |
| ReloadSwiss RS 60 | 41 gr | 80% | 33,373 psi | 65% | 2858 fps | 97.5% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 41,263 psi | 80% | 3025 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 40,350 psi | 78% | 2887 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 80% | 33,547 psi | 65% | 2772 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,351 psi | 82% | 2972 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 38,392 psi | 75% | 2864 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 36,970 psi | 72% | 2887 fps | 95.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,611 psi | 81% | 2946 fps | 97.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,114 psi | 70% | 2743 fps | 99.6% |
| Somchem S335 | <<locked>> | 80% | 43,250 psi | 84% | 2904 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,091 psi | 84% | 2966 fps | 97.6% |
| Somchem S355 | <<locked>> | 80% | 34,534 psi | 67% | 2782 fps | 95.6% |
| Somchem S365 | <<locked>> | 86% | 30,458 psi | 59% | 2756 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 39,407 psi | 77% | 2877 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,161 psi | 78% | 2881 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 32,735 psi | 64% | 2713 fps | 96.6% |
| Vihtavuori N160 | <<locked>> | 90% | 40,741 psi | 79% | 2953 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 38,812 psi | 75% | 2861 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 90% | 40,001 psi | 78% | 2949 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 98% | 38,145 psi | 74% | 2979 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 33,402 psi | 65% | 2736 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,191 psi | 80% | 2953 fps | 97.8% |
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 55 powders for .257 Roberts loaded with the .257 | 92gr | Reichenberg Spezial Jagd. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,140 fps; across all powders the maximum-charge window runs from 2,005 fps to 3,140 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 55 of the 55 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (355 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 92.0 gr projectile in 0.257" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Hodgdon TrailBoss, ReloadSwiss RS 14 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 Roberts with the .257 | 92gr | Reichenberg Spezial Jagd they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.