Load Specifications
Load data in caliber .25-06 Rem. with .257 | 100gr | Sierra GameKing bullet and 97 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-16, ReloadSwiss RS 70 and Alliant Reloder-26.
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% | 57,972 psi | 89% | 3081 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,767 psi | 85% | 3087 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,780 psi | 82% | 3120 fps | 99% |
| Accurate 4064 | <<locked>> | 86% | 58,204 psi | 89% | 3133 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,782 psi | 85% | 3186 fps | 99.9% |
| Accurate High Countryᴾ | <<locked>> | 100% | 59,001 psi | 90% | 3333 fps | 97.1% |
| ADI AR 2206H | <<locked>> | 82% | 57,087 psi | 87% | 3166 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 58,465 psi | 90% | 3169 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,739 psi | 87% | 3222 fps | 97.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 58,015 psi | 89% | 3301 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,637 psi | 85% | 3136 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,999 psi | 86% | 3163 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,275 psi | 86% | 3245 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 58,073 psi | 89% | 3278 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,985 psi | 86% | 3205 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,374 psi | 82% | 3202 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,256 psi | 77% | 3140 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,976 psi | 67% | 3048 fps | 98.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 58,566 psi | 90% | 3350 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,319 psi | 88% | 3179 fps | 100% |
| Bofors RP3 | <<locked>> | 86% | 56,782 psi | 87% | 3159 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,374 psi | 82% | 3202 fps | 97.1% |
| Bofors RP7 | <<locked>> | 90% | 56,115 psi | 86% | 3133 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 86% | 57,087 psi | 87% | 3173 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 92% | 58,131 psi | 89% | 3241 fps | 99% |
| Hodgdon H4350 | <<locked>> | 90% | 57,609 psi | 88% | 3199 fps | 97.9% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 58,624 psi | 90% | 3219 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 82% | 57,711 psi | 88% | 3176 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,797 psi | 87% | 3166 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 58,291 psi | 89% | 3212 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 58,697 psi | 90% | 3274 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,129 psi | 55% | 2008 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 58,871 psi | 90% | 3179 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 58,392 psi | 89% | 3153 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,914 psi | 89% | 3153 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,898 psi | 87% | 3130 fps | 98.7% |
| IMR 4350 | <<locked>> | 94% | 56,956 psi | 87% | 3163 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,667 psi | 88% | 3163 fps | 98.8% |
| IMR 4831 | <<locked>> | 94% | 56,202 psi | 86% | 3176 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 57,421 psi | 88% | 3196 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 57,580 psi | 88% | 3133 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,738 psi | 85% | 3084 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 58,117 psi | 89% | 3146 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,682 psi | 88% | 3159 fps | 99.6% |
| Lovex S070 | <<locked>> | 92% | 55,637 psi | 85% | 3146 fps | 98.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,643 psi | 68% | 2956 fps | 97.4% |
| Norma 201 | <<locked>> | 82% | 55,869 psi | 86% | 3107 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,376 psi | 86% | 3104 fps | 100% |
| Norma 203B | <<locked>> | 86% | 58,769 psi | 90% | 3202 fps | 100% |
| Norma 204 | <<locked>> | 94% | 58,160 psi | 89% | 3219 fps | 97.5% |
| Norma MRPᴾ | <<locked>> | 100% | 56,971 psi | 87% | 3301 fps | 98.9% |
| Norma URP | <<locked>> | 94% | 57,885 psi | 89% | 3225 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,014 psi | 86% | 3169 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 56,942 psi | 87% | 3222 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,804 psi | 72% | 3051 fps | 96.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,825 psi | 56% | 2054 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,971 psi | 87% | 3153 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,072 psi | 87% | 3238 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,551 psi | 88% | 3271 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,637 psi | 85% | 3205 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 58,334 psi | 89% | 3301 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 56,376 psi | 86% | 3104 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,594 psi | 87% | 3150 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 58,392 psi | 89% | 3189 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 98% | 55,259 psi | 85% | 3192 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 90% | 56,115 psi | 86% | 3133 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,682 psi | 88% | 3159 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,580 psi | 88% | 3133 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 58,117 psi | 89% | 3146 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,637 psi | 85% | 3146 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 58,392 psi | 89% | 3212 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 58,856 psi | 90% | 3169 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,767 psi | 85% | 3133 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,391 psi | 86% | 3035 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,537 psi | 88% | 3035 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,696 psi | 88% | 3107 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 58,784 psi | 90% | 3255 fps | 98% |
| Somchem S335 | <<locked>> | 82% | 56,347 psi | 86% | 3031 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 58,305 psi | 89% | 3153 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,681 psi | 87% | 3146 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 57,479 psi | 88% | 3228 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,188 psi | 86% | 3169 fps | 98.2% |
| Vihtavuori N133 | <<locked>> | 82% | 56,855 psi | 87% | 3015 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,652 psi | 87% | 3064 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,058 psi | 87% | 3077 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 58,204 psi | 89% | 3120 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,594 psi | 87% | 3163 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,822 psi | 79% | 3077 fps | 97.1% |
| Vihtavuori N540 | <<locked>> | 84% | 55,376 psi | 85% | 3071 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,608 psi | 85% | 3166 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,536 psi | 87% | 3228 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,246 psi | 88% | 3284 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,420 psi | 86% | 3127 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 58,131 psi | 89% | 3241 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,730 psi | 70% | 3192 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,941 psi | 86% | 3140 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,391 psi | 86% | 3159 fps | 97.4% |
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% | 51,024 psi | 78% | 2979 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,863 psi | 75% | 2966 fps | 96.6% |
| Accurate 3100 | <<locked>> | 90% | 37,913 psi | 58% | 2808 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 48,312 psi | 74% | 2982 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,695 psi | 56% | 2808 fps | 96.7% |
| Accurate High Country | <<locked>> | 96% | 51,126 psi | 78% | 3196 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 53,708 psi | 82% | 3110 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,498 psi | 70% | 2946 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 49,661 psi | 76% | 3094 fps | 95.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,415 psi | 77% | 3173 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,919 psi | 70% | 2969 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,240 psi | 75% | 3048 fps | 99.7% |
| Alliant Reloder-16 | 44.9 gr | 80% | 35,621 psi | 55% | 2815 fps | 96.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,524 psi | 62% | 2956 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 92% | 46,166 psi | 71% | 3022 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 96% | 46,659 psi | 71% | 3074 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 84% | 29,776 psi | 46% | 2661 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 94% | 36,085 psi | 55% | 2848 fps | 95.1% |
| Alliant Reloder-26 | 53.3 gr | 86% | 34,606 psi | 53% | 2851 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,664 psi | 82% | 3120 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 46,383 psi | 71% | 2982 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 46,659 psi | 71% | 3074 fps | 95.3% |
| Bofors RP7 | <<locked>> | 82% | 43,337 psi | 66% | 2890 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 46,818 psi | 72% | 2989 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 82% | 41,263 psi | 63% | 2917 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 84% | 47,398 psi | 73% | 3009 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 98% | 54,650 psi | 84% | 3150 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 54,346 psi | 83% | 3123 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,112 psi | 51% | 2703 fps | 97.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,879 psi | 78% | 3094 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 43,584 psi | 67% | 2995 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,137 psi | 42% | 1804 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,750 psi | 79% | 3064 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 54,766 psi | 84% | 3104 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,848 psi | 73% | 2982 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,140 psi | 77% | 3009 fps | 97.6% |
| IMR 4350 | <<locked>> | 86% | 44,135 psi | 68% | 2923 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,163 psi | 65% | 2867 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 35,302 psi | 54% | 2759 fps | 96.3% |
| IMR 4895 | <<locked>> | 80% | 50,502 psi | 77% | 3077 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 54,114 psi | 83% | 3084 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,460 psi | 80% | 3031 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,080 psi | 74% | 2982 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,813 psi | 61% | 2815 fps | 96.3% |
| Lovex S070 | <<locked>> | 82% | 40,480 psi | 62% | 2848 fps | 95.3% |
| Lovex S071 | <<locked>> | 96% | 39,073 psi | 60% | 2838 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 52,489 psi | 80% | 3054 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,011 psi | 81% | 3051 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,617 psi | 74% | 3031 fps | 99.8% |
| Norma 204 | <<locked>> | 88% | 47,195 psi | 72% | 3022 fps | 95% |
| Norma MRP | <<locked>> | 92% | 42,902 psi | 66% | 3025 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 36,550 psi | 56% | 2805 fps | 96.5% |
| Ramshot Big Game | <<locked>> | 80% | 48,936 psi | 75% | 3051 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 38,014 psi | 58% | 2848 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 98% | 43,511 psi | 67% | 2979 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,601 psi | 42% | 1847 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,717 psi | 72% | 2969 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,200 psi | 82% | 3173 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,047 psi | 66% | 3025 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,448 psi | 56% | 2822 fps | 96.2% |
| ReloadSwiss RS 70 | 49.2 gr | 80% | 35,578 psi | 55% | 2825 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 49,864 psi | 76% | 2999 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,642 psi | 67% | 2923 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 94% | 51,532 psi | 79% | 3071 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 94% | 48,269 psi | 74% | 3064 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 82% | 43,337 psi | 66% | 2890 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,813 psi | 61% | 2815 fps | 96.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 54,114 psi | 83% | 3084 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 48,080 psi | 74% | 2982 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 40,480 psi | 62% | 2848 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,817 psi | 69% | 2979 fps | 99.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 54,708 psi | 84% | 3104 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,228 psi | 80% | 3074 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,982 psi | 81% | 2986 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,744 psi | 69% | 2835 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 41,495 psi | 64% | 2808 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 47,834 psi | 73% | 3058 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 53,069 psi | 81% | 2982 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 54,607 psi | 84% | 3097 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,976 psi | 67% | 2923 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 32,880 psi | 50% | 2753 fps | 98.6% |
| Somchem S385 | <<locked>> | 90% | 42,975 psi | 66% | 2923 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 53,461 psi | 82% | 2966 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,864 psi | 76% | 2963 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,459 psi | 77% | 2979 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,032 psi | 64% | 2848 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 37,956 psi | 58% | 2808 fps | 97% |
| Vihtavuori N165 | <<locked>> | 96% | 45,281 psi | 69% | 2956 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 48,820 psi | 75% | 2969 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,492 psi | 57% | 2805 fps | 96.6% |
| Vihtavuori N555 | <<locked>> | 84% | 32,895 psi | 50% | 2746 fps | 95.9% |
| Vihtavuori N560 | <<locked>> | 98% | 53,388 psi | 82% | 3215 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,275 psi | 57% | 2776 fps | 98.9% |
| Winchester 760 | <<locked>> | 82% | 41,481 psi | 64% | 2923 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 86% | 28,210 psi | 43% | 2684 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,301 psi | 80% | 3081 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 48,791 psi | 75% | 3028 fps | 95.7% |
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 .25-06 Rem. loaded with the .257 | 100gr | Sierra GameKing. Alliant Reloder-26 delivers the highest muzzle velocity at 3,350 fps; across all powders the maximum-charge window runs from 2,008 fps to 3,350 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 (450 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 100.0 gr projectile in 0.257" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, Accurate MAGPRO 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-16, ReloadSwiss RS 70, Alliant Reloder-26 rank at the top here: for .25-06 Rem. with the .257 | 100gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Baschieri & Pellagri 109, Bofors RP30, Hodgdon H1000 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.