Load Specifications
Load data in caliber .25-06 Rem. with .257 | 90gr | Prvi Partizan HP 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-17.
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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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 2015 | <<locked>> | 82% | 58,131 psi | 89% | 3202 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 58,450 psi | 90% | 3235 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,637 psi | 87% | 3228 fps | 97.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,140 psi | 77% | 3182 fps | 97.7% |
| Accurate 4064 | <<locked>> | 88% | 58,508 psi | 90% | 3287 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,927 psi | 86% | 3323 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 84% | 57,754 psi | 88% | 3320 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,376 psi | 85% | 3258 fps | 99.7% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 57,421 psi | 88% | 3360 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,260 psi | 86% | 3258 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 58,117 psi | 89% | 3238 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 58,726 psi | 90% | 3455 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,086 psi | 86% | 3287 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,492 psi | 87% | 3310 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 96% | 56,565 psi | 87% | 3392 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 58,088 psi | 89% | 3422 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,405 psi | 86% | 3343 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,920 psi | 72% | 3209 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,273 psi | 83% | 3419 fps | 99.6% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 57,957 psi | 89% | 3327 fps | 99.8% |
| Bofors RP3 | <<locked>> | 88% | 57,072 psi | 87% | 3307 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 56,579 psi | 87% | 3271 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 57,667 psi | 88% | 3241 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 56,666 psi | 87% | 3291 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 57,769 psi | 89% | 3320 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 58,349 psi | 89% | 3379 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 92% | 58,175 psi | 89% | 3337 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 84% | 58,407 psi | 89% | 3330 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 56,681 psi | 87% | 3304 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 58,842 psi | 90% | 3366 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,882 psi | 84% | 3343 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,824 psi | 55% | 2110 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,796 psi | 85% | 3271 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 58,697 psi | 90% | 3310 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 58,349 psi | 89% | 3301 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 58,001 psi | 89% | 3278 fps | 98.1% |
| IMR 4350 | <<locked>> | 96% | 57,406 psi | 88% | 3297 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 92% | 58,160 psi | 89% | 3304 fps | 98.1% |
| IMR 4831 | <<locked>> | 96% | 56,376 psi | 86% | 3314 fps | 99.7% |
| IMR 4895 | <<locked>> | 86% | 57,928 psi | 89% | 3346 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 56,260 psi | 86% | 3258 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 58,349 psi | 89% | 3291 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,710 psi | 87% | 3238 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 58,407 psi | 89% | 3294 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 58,334 psi | 89% | 3304 fps | 99.1% |
| Lovex S070 | <<locked>> | 94% | 56,130 psi | 86% | 3284 fps | 98.1% |
| Norma 201 | <<locked>> | 84% | 56,318 psi | 86% | 3258 fps | 100% |
| Norma 202 | <<locked>> | 84% | 57,116 psi | 88% | 3261 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,724 psi | 85% | 3297 fps | 99.9% |
| Norma 204 | <<locked>> | 96% | 58,842 psi | 90% | 3360 fps | 96.7% |
| Norma MRPᴾ | <<locked>> | 100% | 53,011 psi | 81% | 3356 fps | 97.4% |
| Norma URP | <<locked>> | 96% | 58,146 psi | 89% | 3369 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 86% | 56,753 psi | 87% | 3320 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 57,363 psi | 88% | 3363 fps | 98.8% |
| Ramshot TAC | <<locked>> | 82% | 56,811 psi | 87% | 3278 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,739 psi | 87% | 3297 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,434 psi | 56% | 2159 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 57,653 psi | 88% | 3294 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 57,261 psi | 88% | 3386 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 57,624 psi | 88% | 3422 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,825 psi | 86% | 3343 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 58,682 psi | 90% | 3438 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 82% | 56,956 psi | 87% | 3241 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 57,130 psi | 88% | 3261 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,855 psi | 87% | 3297 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,288 psi | 85% | 3320 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 92% | 56,579 psi | 87% | 3271 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 58,334 psi | 89% | 3304 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 84% | 58,349 psi | 89% | 3291 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 58,407 psi | 89% | 3294 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,130 psi | 86% | 3284 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 58,784 psi | 90% | 3360 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,492 psi | 85% | 3251 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,289 psi | 86% | 3281 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 57,232 psi | 88% | 3189 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 58,436 psi | 90% | 3189 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 58,537 psi | 90% | 3248 fps | 98.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,795 psi | 84% | 3314 fps | 96.2% |
| Somchem S335 | <<locked>> | 84% | 56,913 psi | 87% | 3182 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 59,030 psi | 90% | 3304 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 57,058 psi | 87% | 3294 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 57,334 psi | 88% | 3369 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,246 psi | 86% | 3297 fps | 97.4% |
| Vihtavuori N133 | <<locked>> | 84% | 57,638 psi | 88% | 3173 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 57,000 psi | 87% | 3215 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 57,696 psi | 88% | 3232 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 58,610 psi | 90% | 3268 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 56,942 psi | 87% | 3307 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 82% | 57,116 psi | 88% | 3264 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 56,202 psi | 86% | 3225 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,173 psi | 86% | 3307 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,417 psi | 80% | 3297 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 56,884 psi | 87% | 3268 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 57,696 psi | 88% | 3314 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 58,668 psi | 90% | 3386 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,496 psi | 65% | 3238 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 84% | 56,623 psi | 87% | 3291 fps | 100% |
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 2015 | <<locked>> | 80% | 54,650 psi | 84% | 3153 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 47,761 psi | 73% | 3071 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 49,356 psi | 76% | 3097 fps | 95.6% |
| Accurate 3100 | <<locked>> | 94% | 40,611 psi | 62% | 2989 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 45,179 psi | 69% | 3064 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 36,419 psi | 56% | 2920 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 50,908 psi | 78% | 3199 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 80% | 43,134 psi | 66% | 3022 fps | 98.1% |
| ADI AR 2209 | <<locked>> | 98% | 53,534 psi | 82% | 3291 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,011 psi | 81% | 3205 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 54,157 psi | 83% | 3182 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,152 psi | 72% | 3241 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,323 psi | 66% | 3051 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,485 psi | 71% | 3127 fps | 98.8% |
| Alliant Reloder-16 | 46.8 gr | 82% | 35,882 psi | 55% | 2936 fps | 95.4% |
| Alliant Reloder-17 | 49.2 gr | 80% | 38,058 psi | 58% | 3018 fps | 98% |
| Alliant Reloder-19 | <<locked>> | 98% | 52,736 psi | 81% | 3274 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 88% | 31,633 psi | 48% | 2825 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 90% | 37,304 psi | 57% | 3035 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,589 psi | 78% | 3199 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 43,584 psi | 67% | 3061 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 46,630 psi | 71% | 3084 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 54,085 psi | 83% | 3186 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,779 psi | 81% | 3228 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,092 psi | 68% | 3061 fps | 97.3% |
| Hodgdon H414 | <<locked>> | 86% | 44,454 psi | 68% | 3114 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 88% | 50,952 psi | 78% | 3205 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 51,488 psi | 79% | 3215 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,980 psi | 47% | 2756 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,761 psi | 73% | 3176 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 47,282 psi | 72% | 3196 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,774 psi | 41% | 1893 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,139 psi | 75% | 3153 fps | 99.7% |
| IMR 3031 | <<locked>> | 80% | 51,663 psi | 79% | 3205 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,324 psi | 69% | 3064 fps | 98.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,688 psi | 73% | 3087 fps | 96% |
| IMR 4350 | <<locked>> | 90% | 47,398 psi | 73% | 3114 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 45,368 psi | 70% | 3061 fps | 95.3% |
| IMR 4831 | <<locked>> | 82% | 35,143 psi | 54% | 2874 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 47,688 psi | 73% | 3163 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 80% | 53,011 psi | 81% | 3205 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,908 psi | 78% | 3176 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,053 psi | 77% | 3123 fps | 99.6% |
| Lovex S062 | <<locked>> | 80% | 45,484 psi | 70% | 3068 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 39,972 psi | 61% | 2940 fps | 95.2% |
| Lovex S070 | <<locked>> | 86% | 43,294 psi | 66% | 3031 fps | 95% |
| Norma 201 | <<locked>> | 80% | 49,574 psi | 76% | 3140 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 50,256 psi | 77% | 3146 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,876 psi | 70% | 3114 fps | 99.1% |
| Norma 204 | <<locked>> | 94% | 54,853 psi | 84% | 3291 fps | 95.8% |
| Norma MRP | <<locked>> | 96% | 46,079 psi | 71% | 3215 fps | 95.5% |
| Norma URP | <<locked>> | 82% | 36,448 psi | 56% | 2923 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 45,905 psi | 70% | 3123 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 43,497 psi | 67% | 3097 fps | 95.9% |
| Ramshot TAC | <<locked>> | 80% | 53,055 psi | 81% | 3212 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,156 psi | 81% | 3238 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,166 psi | 42% | 1939 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,092 psi | 68% | 3035 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,850 psi | 76% | 3251 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,495 psi | 62% | 3097 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 36,274 psi | 56% | 2936 fps | 95% |
| ReloadSwiss RS 70 | 52.4 gr | 84% | 38,305 psi | 59% | 3009 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 53,650 psi | 82% | 3186 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,355 psi | 73% | 3087 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 80% | 40,741 psi | 62% | 2989 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 98% | 51,837 psi | 79% | 3258 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 86% | 46,630 psi | 71% | 3084 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 82% | 39,972 psi | 61% | 2940 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,908 psi | 78% | 3176 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,484 psi | 70% | 3068 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 86% | 43,294 psi | 66% | 3031 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,018 psi | 64% | 3048 fps | 98.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,909 psi | 80% | 3192 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,400 psi | 76% | 3159 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,502 psi | 77% | 3084 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,525 psi | 65% | 2927 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 44,875 psi | 69% | 2999 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 51,343 psi | 79% | 3251 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 50,256 psi | 77% | 3077 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,445 psi | 79% | 3179 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 41,263 psi | 63% | 2995 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 30,574 psi | 47% | 2799 fps | 96.6% |
| Somchem S385 | <<locked>> | 96% | 49,052 psi | 75% | 3169 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 51,010 psi | 78% | 3074 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,137 psi | 72% | 3061 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,514 psi | 73% | 3068 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,334 psi | 60% | 2917 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 37,840 psi | 58% | 2927 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 53,359 psi | 82% | 3205 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,166 psi | 71% | 3054 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 37,565 psi | 58% | 2927 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 88% | 34,809 psi | 53% | 2913 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,012 psi | 54% | 2831 fps | 97.3% |
| Winchester 748 | <<locked>> | 80% | 53,664 psi | 82% | 3248 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 44,454 psi | 68% | 3114 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 30,081 psi | 46% | 2848 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,269 psi | 75% | 3163 fps | 99.7% |
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 116 powders for .25-06 Rem. loaded with the .257 | 90gr | Prvi Partizan HP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,455 fps; across all powders the maximum-charge window runs from 2,110 fps to 3,455 fps. Accurate 3100 gives the best case fill at 100 %, and 116 of the 116 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 90.0 gr projectile in 0.257" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2209 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-17 rank at the top here: for .25-06 Rem. with the .257 | 90gr | Prvi Partizan HP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.