Load Specifications
Bullet Manufacturer:Rhino Bullets
Bullet Weight:110 gr
Bullet Diameter:0.257"
Bullet Length:<<locked>>
Caliber:.255 GS load data
Case Length (l3):2.165"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:62 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:12.0
Load data in caliber .255 GS with .257 | 110gr | Rhino Solid Shank bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 and ReloadSwiss RS 60.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 55,956 psi | 88% | 2940 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,595 psi | 90% | 3005 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,937 psi | 80% | 2976 fps | 98.7% |
| Accurate 4064 | <<locked>> | 86% | 56,130 psi | 88% | 2992 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,811 psi | 89% | 3094 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 55,317 psi | 87% | 3022 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,507 psi | 89% | 3025 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,201 psi | 85% | 3071 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,508 psi | 90% | 3018 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,535 psi | 87% | 3150 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,159 psi | 90% | 3048 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,479 psi | 90% | 3071 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,305 psi | 90% | 3153 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,071 psi | 86% | 3127 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,203 psi | 90% | 3120 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,459 psi | 79% | 3051 fps | 96.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,587 psi | 75% | 2995 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,756 psi | 65% | 2900 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,723 psi | 86% | 3196 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,347 psi | 87% | 3038 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 54,447 psi | 85% | 3012 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,459 psi | 79% | 3051 fps | 96.6% |
| Bofors RP7 | <<locked>> | 92% | 57,624 psi | 90% | 3045 fps | 98.5% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,551 psi | 90% | 3048 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 54,998 psi | 86% | 3025 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 55,376 psi | 87% | 3087 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 90% | 55,347 psi | 87% | 3048 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 82% | 55,941 psi | 88% | 3028 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 57,653 psi | 90% | 3071 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,072 psi | 88% | 3064 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,680 psi | 87% | 3127 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,027 psi | 56% | 1890 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,000 psi | 89% | 3031 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,376 psi | 88% | 3009 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,028 psi | 88% | 3009 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,332 psi | 87% | 2986 fps | 98.6% |
| IMR 4350 | <<locked>> | 94% | 54,679 psi | 86% | 3015 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,579 psi | 87% | 3015 fps | 98.6% |
| IMR 4831 | <<locked>> | 96% | 57,072 psi | 89% | 3084 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,201 psi | 87% | 3045 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,508 psi | 90% | 3058 fps | 96% |
| IMR 8208 XBR | <<locked>> | 82% | 57,508 psi | 90% | 3018 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,651 psi | 87% | 2992 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,493 psi | 90% | 2992 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,202 psi | 88% | 3002 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,622 psi | 87% | 3012 fps | 99.4% |
| Lovex S070 | <<locked>> | 94% | 56,985 psi | 89% | 3058 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,163 psi | 66% | 2815 fps | 97% |
| Norma 201 | <<locked>> | 84% | 57,566 psi | 90% | 3015 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,723 psi | 86% | 2963 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,768 psi | 89% | 3058 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,463 psi | 87% | 3071 fps | 97.2% |
| Norma MRPᴾ | <<locked>> | 100% | 53,867 psi | 84% | 3146 fps | 98.6% |
| Norma URP | <<locked>> | 94% | 55,579 psi | 87% | 3081 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 57,493 psi | 90% | 3081 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,230 psi | 85% | 3074 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 82% | 57,667 psi | 90% | 3058 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,796 psi | 58% | 1936 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,882 psi | 86% | 3005 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,723 psi | 86% | 3084 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,607 psi | 86% | 3120 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,797 psi | 89% | 3120 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,216 psi | 87% | 3143 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 54,839 psi | 86% | 2966 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,302 psi | 85% | 3002 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,144 psi | 88% | 3045 fps | 96.3% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,391 psi | 88% | 3107 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 92% | 57,624 psi | 90% | 3045 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,622 psi | 87% | 3012 fps | 99.4% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,651 psi | 87% | 2992 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,202 psi | 88% | 3002 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,985 psi | 89% | 3058 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,246 psi | 88% | 3068 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,449 psi | 88% | 3022 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,377 psi | 90% | 3045 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,795 psi | 86% | 2890 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,666 psi | 87% | 2894 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,651 psi | 87% | 2966 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,883 psi | 88% | 3100 fps | 97.6% |
| Somchem S335 | <<locked>> | 82% | 54,476 psi | 85% | 2887 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,318 psi | 88% | 3012 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,360 psi | 85% | 2999 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 54,505 psi | 85% | 3081 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,855 psi | 89% | 3077 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 82% | 55,303 psi | 87% | 2874 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 54,737 psi | 86% | 2920 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,405 psi | 87% | 2940 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,927 psi | 88% | 2979 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 57,740 psi | 90% | 3074 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,255 psi | 77% | 2933 fps | 96.7% |
| Vihtavuori N540 | <<locked>> | 86% | 57,087 psi | 89% | 2982 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,913 psi | 89% | 3077 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,258 psi | 83% | 3077 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 53,708 psi | 84% | 2986 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,695 psi | 87% | 3094 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,091 psi | 68% | 3041 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,392 psi | 90% | 3051 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,635 psi | 84% | 3015 fps | 97% |
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% | 49,023 psi | 77% | 2838 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,253 psi | 74% | 2825 fps | 96.4% |
| Accurate 3100 | <<locked>> | 90% | 36,027 psi | 56% | 2677 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 46,398 psi | 73% | 2838 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,940 psi | 55% | 2671 fps | 96.5% |
| ADI AR 2206H | <<locked>> | 80% | 51,808 psi | 81% | 2963 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,106 psi | 69% | 2805 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 47,514 psi | 74% | 2949 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,867 psi | 84% | 2963 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,341 psi | 76% | 3022 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,237 psi | 69% | 2828 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,340 psi | 74% | 2900 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,418 psi | 54% | 2680 fps | 96.5% |
| Alliant Reloder-17 | 44.2 gr | 80% | 38,899 psi | 61% | 2818 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 47,007 psi | 74% | 2940 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 98% | 47,413 psi | 74% | 2995 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,631 psi | 45% | 2536 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,782 psi | 58% | 2776 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 86% | 32,924 psi | 52% | 2717 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,532 psi | 81% | 2972 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 44,585 psi | 70% | 2841 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 47,413 psi | 74% | 2995 fps | 95.8% |
| Bofors RP7 | <<locked>> | 82% | 42,061 psi | 66% | 2756 fps | 95.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,896 psi | 84% | 2995 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 45,194 psi | 71% | 2851 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 82% | 39,624 psi | 62% | 2782 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 84% | 45,614 psi | 71% | 2867 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 52,359 psi | 82% | 2972 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,053 psi | 50% | 2579 fps | 97.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,008 psi | 77% | 2953 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 41,843 psi | 66% | 2858 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,992 psi | 42% | 1693 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,169 psi | 79% | 2920 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,852 psi | 83% | 2956 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,383 psi | 73% | 2841 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,559 psi | 76% | 2867 fps | 97.5% |
| IMR 4350 | <<locked>> | 86% | 42,482 psi | 67% | 2789 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,770 psi | 64% | 2733 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 33,866 psi | 53% | 2628 fps | 96.2% |
| IMR 4895 | <<locked>> | 80% | 48,559 psi | 76% | 2930 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 53,824 psi | 84% | 2995 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 53,867 psi | 84% | 2963 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 51,982 psi | 81% | 2940 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,068 psi | 80% | 2887 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,543 psi | 73% | 2841 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,334 psi | 60% | 2680 fps | 96.2% |
| Lovex S070 | <<locked>> | 82% | 38,972 psi | 61% | 2713 fps | 95.1% |
| Lovex S071 | <<locked>> | 96% | 36,999 psi | 58% | 2700 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 50,720 psi | 79% | 2907 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,169 psi | 80% | 2907 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,717 psi | 73% | 2887 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 48,341 psi | 76% | 2943 fps | 95.6% |
| Norma MRP | <<locked>> | 92% | 40,785 psi | 64% | 2884 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 35,056 psi | 55% | 2674 fps | 96.4% |
| Ramshot Big Game | <<locked>> | 80% | 47,036 psi | 74% | 2910 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 38,914 psi | 61% | 2776 fps | 95.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 54,027 psi | 85% | 3002 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,514 psi | 43% | 1736 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,063 psi | 71% | 2828 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,039 psi | 80% | 3022 fps | 99.9% |
| ReloadSwiss RS 60 | 44.2 gr | 80% | 41,336 psi | 65% | 2881 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,853 psi | 55% | 2690 fps | 96% |
| ReloadSwiss RS 70 | 44.9 gr | 80% | 34,098 psi | 53% | 2687 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 48,269 psi | 76% | 2858 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,003 psi | 66% | 2785 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 52,431 psi | 82% | 2982 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 94% | 45,919 psi | 72% | 2920 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 82% | 42,061 psi | 66% | 2756 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,334 psi | 60% | 2680 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,982 psi | 81% | 2940 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,543 psi | 73% | 2841 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 38,972 psi | 61% | 2713 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,960 psi | 67% | 2835 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,823 psi | 83% | 2963 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,372 psi | 79% | 2930 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,532 psi | 81% | 2841 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,395 psi | 68% | 2703 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 40,161 psi | 63% | 2677 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,484 psi | 71% | 2913 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 51,343 psi | 80% | 2841 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,431 psi | 82% | 2949 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,337 psi | 66% | 2782 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 31,502 psi | 49% | 2625 fps | 98.5% |
| Somchem S385 | <<locked>> | 92% | 43,845 psi | 69% | 2848 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 52,011 psi | 82% | 2828 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,269 psi | 76% | 2825 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,776 psi | 76% | 2838 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,480 psi | 63% | 2713 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 36,303 psi | 57% | 2671 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 96% | 43,120 psi | 68% | 2818 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 47,195 psi | 74% | 2831 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,027 psi | 56% | 2674 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 84% | 31,386 psi | 49% | 2615 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,650 psi | 56% | 2641 fps | 98.7% |
| Winchester 760 | <<locked>> | 82% | 39,871 psi | 62% | 2785 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,035 psi | 42% | 2559 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,256 psi | 79% | 2936 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,470 psi | 73% | 2887 fps | 95.2% |
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 98 powders for .255 GS loaded with the .257 | 110gr | Rhino Solid Shank. Alliant Reloder-26 delivers the highest muzzle velocity at 3,196 fps; across all powders the maximum-charge window runs from 1,890 fps to 3,196 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, 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-19, Alliant Reloder-22 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 70, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .255 GS 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.