Load Specifications
Load data in caliber .257 Roberts with .257 | 110gr | Rhino Solid Shank bullet and 46 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Somchem S365 and ReloadSwiss RS 70.
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 3100ᴾ | <<locked>> | 100% | 44,512 psi | 86% | 2818 fps | 96.9% |
| Accurate 4064 | <<locked>> | 82% | 44,759 psi | 87% | 2772 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 43,888 psi | 85% | 2831 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 84% | 45,774 psi | 89% | 2789 fps | 99% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 46,528 psi | 90% | 2940 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 45,730 psi | 89% | 2812 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 82% | 46,006 psi | 89% | 2828 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 92% | 45,571 psi | 89% | 2897 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 88% | 45,905 psi | 89% | 2923 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,221 psi | 82% | 2848 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 44,208 psi | 86% | 2953 fps | 98.3% |
| Bofors RP3 | <<locked>> | 84% | 45,890 psi | 89% | 2825 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 84% | 46,543 psi | 90% | 2828 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 90% | 46,456 psi | 90% | 2881 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 45,063 psi | 88% | 2828 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,723 psi | 69% | 1831 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 45,252 psi | 88% | 2772 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 86% | 45,049 psi | 87% | 2769 fps | 95.8% |
| IMR 4831 | <<locked>> | 92% | 44,976 psi | 87% | 2835 fps | 98.6% |
| Lovex S062 | <<locked>> | 82% | 45,339 psi | 88% | 2776 fps | 99.9% |
| Lovex S065 | <<locked>> | 88% | 44,947 psi | 87% | 2772 fps | 97.3% |
| Lovex S070 | <<locked>> | 90% | 45,339 psi | 88% | 2802 fps | 96.3% |
| Norma 203B | <<locked>> | 82% | 45,324 psi | 88% | 2815 fps | 99.3% |
| Norma URP | <<locked>> | 90% | 43,453 psi | 84% | 2822 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 82% | 45,194 psi | 88% | 2831 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 92% | 45,513 psi | 88% | 2871 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,230 psi | 70% | 1873 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 43,990 psi | 85% | 2756 fps | 96.3% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 45,629 psi | 89% | 2927 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 43,497 psi | 84% | 2844 fps | 98% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 46,238 psi | 90% | 2927 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 86% | 46,108 psi | 90% | 2822 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 44,947 psi | 87% | 2772 fps | 97.3% |
| Shooters World Precision | <<locked>> | 82% | 45,339 psi | 88% | 2776 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 90% | 45,339 psi | 88% | 2802 fps | 96.3% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 44,411 psi | 86% | 2822 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 45,237 psi | 88% | 2690 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 46,441 psi | 90% | 2818 fps | 99.7% |
| Somchem S365 | <<locked>> | 94% | 44,585 psi | 87% | 2884 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 44,628 psi | 87% | 2753 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 90% | 45,527 psi | 88% | 2822 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 82% | 45,919 psi | 89% | 2766 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 44,715 psi | 87% | 2825 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 98% | 43,918 psi | 85% | 2874 fps | 98.9% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 45,179 psi | 88% | 2795 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,029 psi | 74% | 2864 fps | 99.5% |
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 3100 | <<locked>> | 96% | 38,740 psi | 75% | 2700 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 42,032 psi | 82% | 2720 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 33,185 psi | 64% | 2592 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 40,495 psi | 79% | 2680 fps | 98% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,424 psi | 84% | 2874 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,422 psi | 79% | 2707 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,250 psi | 84% | 2772 fps | 98.7% |
| Alliant Reloder-16 | <<locked>> | 82% | 33,301 psi | 65% | 2605 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,853 psi | 68% | 2674 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 90% | 30,922 psi | 60% | 2562 fps | 95.9% |
| Alliant Reloder-26 | 46.7 gr | 92% | 35,824 psi | 70% | 2753 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 40,190 psi | 78% | 2713 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 80% | 40,872 psi | 79% | 2713 fps | 97.1% |
| Hodgdon H414 | <<locked>> | 88% | 43,352 psi | 84% | 2818 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,674 psi | 56% | 2441 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,571 psi | 52% | 1634 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,525 psi | 83% | 2720 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,453 psi | 82% | 2717 fps | 95% |
| IMR 4831 | <<locked>> | 84% | 34,447 psi | 67% | 2605 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 42,656 psi | 83% | 2723 fps | 99.6% |
| Lovex S065 | <<locked>> | 82% | 37,260 psi | 72% | 2608 fps | 95% |
| Lovex S070 | <<locked>> | 88% | 42,699 psi | 83% | 2746 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 42,627 psi | 83% | 2759 fps | 99% |
| Norma URP | <<locked>> | 82% | 33,460 psi | 65% | 2592 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 42,221 psi | 82% | 2772 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 39,769 psi | 77% | 2749 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,108 psi | 53% | 1677 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,162 psi | 80% | 2697 fps | 95.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,086 psi | 72% | 2743 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 35,462 psi | 69% | 2667 fps | 95.6% |
| ReloadSwiss RS 70 | 43.3 gr | 86% | 37,739 psi | 73% | 2736 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 37,855 psi | 74% | 2654 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 37,260 psi | 72% | 2608 fps | 95% |
| Shooters World Precision | <<locked>> | 80% | 42,656 psi | 83% | 2723 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 42,699 psi | 83% | 2746 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,696 psi | 75% | 2703 fps | 98.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,842 psi | 77% | 2592 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 38,580 psi | 75% | 2661 fps | 98.5% |
| Somchem S365 | 37.6 gr | 80% | 28,166 psi | 55% | 2487 fps | 96.5% |
| Vihtavuori N150 | <<locked>> | 80% | 36,724 psi | 71% | 2592 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 34,853 psi | 68% | 2595 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 42,946 psi | 83% | 2713 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 34,505 psi | 67% | 2598 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 88% | 31,299 psi | 61% | 2582 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,503 psi | 63% | 2516 fps | 97% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,269 psi | 57% | 2589 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 46 powders for .257 Roberts loaded with the .257 | 110gr | Rhino Solid Shank. Alliant Reloder-26 delivers the highest muzzle velocity at 2,953 fps; across all powders the maximum-charge window runs from 1,831 fps to 2,953 fps. Accurate 3100 gives the best case fill at 100 %, and 46 of the 46 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 110.0 gr projectile in 0.257" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Hodgdon TrailBoss 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. Alliant Reloder-26, Somchem S365, ReloadSwiss RS 70 rank at the top here: for .257 Roberts with the .257 | 110gr | Rhino Solid Shank 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.