Load Specifications
Bullet:.257 | 90gr | Hornady CX
Bullet Manufacturer:Hornady
Bullet Weight:90 gr
Bullet Diameter:0.257"
Bullet Length:<<locked>>
Caliber:.25-06 Rem. load data
Case Length (l3):2.489"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:65.8 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:65,267 psi
Recommended Twist Rate:1:10.5
Load data in caliber .25-06 Rem. with .257 | 90gr | Hornady CX bullet and 96 powders. The key underlying parameters are shown in the table above.
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 2015 | <<locked>> | 82% | 55,492 psi | 85% | 3169 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 58,682 psi | 90% | 3245 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,681 psi | 87% | 3264 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 57,812 psi | 89% | 3251 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,514 psi | 71% | 3120 fps | 96.7% |
| Accurate 4064 | <<locked>> | 90% | 58,856 psi | 90% | 3297 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 56,463 psi | 87% | 3340 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 86% | 58,697 psi | 90% | 3337 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 56,434 psi | 86% | 3281 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 57,580 psi | 88% | 3284 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 58,871 psi | 90% | 3255 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,535 psi | 85% | 3409 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 56,913 psi | 87% | 3304 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 57,319 psi | 88% | 3330 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 57,145 psi | 88% | 3402 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 94% | 59,030 psi | 90% | 3442 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,048 psi | 67% | 3156 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,531 psi | 77% | 3353 fps | 99% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,564 psi | 85% | 3291 fps | 99.6% |
| Bofors RP3 | <<locked>> | 90% | 57,841 psi | 89% | 3323 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 57,421 psi | 88% | 3287 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,550 psi | 85% | 3212 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 57,537 psi | 88% | 3310 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 58,479 psi | 90% | 3333 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 94% | 55,245 psi | 85% | 3327 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 92% | 55,245 psi | 85% | 3287 fps | 96.3% |
| Hodgdon H4895 | <<locked>> | 84% | 55,738 psi | 85% | 3291 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 57,537 psi | 88% | 3320 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,898 psi | 86% | 3323 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,014 psi | 86% | 3363 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,534 psi | 54% | 2096 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 57,159 psi | 88% | 3297 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 56,057 psi | 86% | 3278 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,796 psi | 85% | 3261 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,463 psi | 85% | 3235 fps | 97.6% |
| IMR 4350 | <<locked>> | 98% | 58,523 psi | 90% | 3317 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,709 psi | 85% | 3261 fps | 97.6% |
| IMR 4831 | <<locked>> | 98% | 56,768 psi | 87% | 3323 fps | 99.7% |
| IMR 4895 | <<locked>> | 88% | 58,842 psi | 90% | 3366 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 57,580 psi | 88% | 3284 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,376 psi | 85% | 3251 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 57,783 psi | 89% | 3258 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,666 psi | 85% | 3255 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,303 psi | 85% | 3251 fps | 98.7% |
| Lovex S070 | <<locked>> | 96% | 56,826 psi | 87% | 3297 fps | 98.1% |
| Norma 201 | <<locked>> | 86% | 57,305 psi | 88% | 3274 fps | 100% |
| Norma 202 | <<locked>> | 86% | 57,957 psi | 89% | 3274 fps | 100% |
| Norma 203B | <<locked>> | 88% | 56,565 psi | 87% | 3314 fps | 99.9% |
| Norma 204 | <<locked>> | 96% | 55,579 psi | 85% | 3304 fps | 95.8% |
| Norma MRPᴾ | <<locked>> | 100% | 49,792 psi | 76% | 3301 fps | 96.5% |
| Norma URP | <<locked>> | 98% | 59,016 psi | 90% | 3386 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 88% | 57,841 psi | 89% | 3343 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 57,986 psi | 89% | 3376 fps | 98.8% |
| Ramshot TAC | <<locked>> | 84% | 58,291 psi | 89% | 3304 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 84% | 58,117 psi | 89% | 3323 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 58,392 psi | 89% | 3281 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,071 psi | 55% | 2146 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 58,856 psi | 90% | 3314 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 58,189 psi | 89% | 3406 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 58,479 psi | 90% | 3438 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,507 psi | 87% | 3360 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,463 psi | 85% | 3389 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 84% | 57,667 psi | 88% | 3255 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 57,914 psi | 89% | 3274 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 57,653 psi | 88% | 3314 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 57,421 psi | 88% | 3287 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,303 psi | 85% | 3251 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,376 psi | 85% | 3251 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,666 psi | 85% | 3255 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 56,826 psi | 87% | 3297 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 55,999 psi | 86% | 3320 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,739 psi | 87% | 3274 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 57,305 psi | 88% | 3301 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 58,595 psi | 90% | 3212 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,680 psi | 85% | 3153 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,521 psi | 85% | 3199 fps | 97.6% |
| Somchem S335 | <<locked>> | 86% | 58,088 psi | 89% | 3202 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,608 psi | 87% | 3268 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 57,638 psi | 88% | 3310 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 57,667 psi | 88% | 3383 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,214 psi | 82% | 3248 fps | 96.7% |
| Vihtavuori N130 | <<locked>> | 82% | 57,812 psi | 89% | 3166 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 58,987 psi | 90% | 3192 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 58,102 psi | 89% | 3238 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 58,726 psi | 90% | 3251 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,738 psi | 85% | 3228 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 57,841 psi | 89% | 3323 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 58,131 psi | 89% | 3281 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 57,174 psi | 88% | 3245 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,608 psi | 87% | 3320 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,965 psi | 75% | 3241 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 58,131 psi | 89% | 3287 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 58,639 psi | 90% | 3333 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,593 psi | 85% | 3337 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,639 psi | 61% | 3166 fps | 99.5% |
| Winchester StaBALL Match | <<locked>> | 86% | 57,638 psi | 88% | 3310 fps | 100% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 51,996 psi | 80% | 3117 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,556 psi | 68% | 3022 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 52,823 psi | 81% | 3205 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 50,430 psi | 77% | 3120 fps | 95.7% |
| Accurate 3100 | <<locked>> | 98% | 43,381 psi | 66% | 3058 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 42,192 psi | 65% | 3012 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 36,376 psi | 56% | 2930 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 48,327 psi | 74% | 3153 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 41,075 psi | 63% | 2979 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,473 psi | 77% | 3166 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 51,387 psi | 79% | 3150 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,730 psi | 69% | 3192 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,988 psi | 63% | 3005 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,874 psi | 67% | 3077 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 36,216 psi | 55% | 2953 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,752 psi | 55% | 2963 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 90% | 31,560 psi | 48% | 2828 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 92% | 37,289 psi | 57% | 3045 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,196 psi | 74% | 3159 fps | 98.6% |
| Bofors RP3 | <<locked>> | 80% | 40,756 psi | 62% | 3005 fps | 98.8% |
| Bofors RP7 | <<locked>> | 88% | 47,471 psi | 73% | 3104 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,924 psi | 80% | 3150 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,096 psi | 77% | 3186 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,524 psi | 64% | 3009 fps | 96.5% |
| Hodgdon H414 | <<locked>> | 88% | 44,918 psi | 69% | 3127 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 90% | 51,866 psi | 79% | 3225 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 48,805 psi | 75% | 3166 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 30,980 psi | 47% | 2762 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,484 psi | 70% | 3136 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 90% | 48,211 psi | 74% | 3219 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,469 psi | 41% | 1883 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,978 psi | 72% | 3114 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 48,950 psi | 75% | 3166 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,120 psi | 66% | 3022 fps | 98.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,701 psi | 70% | 3048 fps | 95.3% |
| IMR 4350 | <<locked>> | 92% | 48,153 psi | 74% | 3130 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 46,253 psi | 71% | 3081 fps | 95.3% |
| IMR 4831 | <<locked>> | 86% | 37,666 psi | 58% | 2943 fps | 95.9% |
| IMR 4895 | <<locked>> | 80% | 44,991 psi | 69% | 3114 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 50,473 psi | 77% | 3166 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 47,993 psi | 74% | 3127 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,964 psi | 73% | 3087 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 43,091 psi | 66% | 3022 fps | 99.3% |
| Lovex S065 | <<locked>> | 84% | 40,321 psi | 62% | 2953 fps | 95.2% |
| Lovex S070 | <<locked>> | 88% | 43,584 psi | 67% | 3041 fps | 95% |
| Norma 201 | <<locked>> | 80% | 47,050 psi | 72% | 3097 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 47,819 psi | 73% | 3107 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,250 psi | 66% | 3061 fps | 98.5% |
| Norma 204 | <<locked>> | 94% | 52,025 psi | 80% | 3241 fps | 95% |
| Norma MRP | <<locked>> | 98% | 46,311 psi | 71% | 3225 fps | 95.4% |
| Norma URP | <<locked>> | 84% | 36,637 psi | 56% | 2936 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 43,453 psi | 67% | 3077 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 43,961 psi | 67% | 3114 fps | 95.9% |
| Ramshot TAC | <<locked>> | 80% | 50,749 psi | 78% | 3173 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,720 psi | 78% | 3199 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 54,665 psi | 84% | 3219 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,818 psi | 41% | 1926 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 44,773 psi | 69% | 3054 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,021 psi | 72% | 3202 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,101 psi | 58% | 3045 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 39,175 psi | 60% | 3018 fps | 96% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 38,638 psi | 59% | 3025 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 50,850 psi | 78% | 3143 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,846 psi | 69% | 3045 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 38,174 psi | 58% | 2936 fps | 98% |
| Rottweil R 907 | <<locked>> | 88% | 47,471 psi | 73% | 3104 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 84% | 40,321 psi | 62% | 2953 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,993 psi | 74% | 3127 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,091 psi | 66% | 3022 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 88% | 43,584 psi | 67% | 3041 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,595 psi | 61% | 2999 fps | 97.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,052 psi | 75% | 3140 fps | 98.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,992 psi | 72% | 3117 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,211 psi | 74% | 3048 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,321 psi | 62% | 2887 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 45,469 psi | 70% | 3012 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 47,935 psi | 73% | 3041 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,023 psi | 75% | 3140 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 38,899 psi | 60% | 2946 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 28,456 psi | 44% | 2740 fps | 95.3% |
| Somchem S385 | <<locked>> | 98% | 49,530 psi | 76% | 3182 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 54,288 psi | 83% | 3117 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 48,689 psi | 75% | 3038 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,512 psi | 68% | 3022 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,208 psi | 69% | 3031 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,101 psi | 57% | 2874 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 38,174 psi | 58% | 2940 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 50,763 psi | 78% | 3159 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,714 psi | 67% | 3015 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 37,565 psi | 58% | 2936 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 90% | 34,505 psi | 53% | 2917 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,025 psi | 51% | 2782 fps | 96.4% |
| Winchester 748 | <<locked>> | 80% | 51,271 psi | 79% | 3215 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 45,165 psi | 69% | 3133 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 94% | 32,169 psi | 49% | 2930 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,760 psi | 72% | 3123 fps | 99.5% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 96 powders for .25-06 Rem. loaded with the .257 | 90gr | Hornady CX. Alliant Reloder-17 delivers the highest muzzle velocity at 3,442 fps; across all powders the maximum-charge window runs from 2,096 fps to 3,442 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (450 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 90.0 gr projectile in 0.257" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.