Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 135gr | AERO SB | HSD 1.5,- smax:13.10 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 Ramshot Hunter.
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% | 56,971 psi | 89% | 3166 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 56,333 psi | 88% | 3189 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,100 psi | 86% | 3189 fps | 96.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 47,979 psi | 75% | 3133 fps | 97.2% |
| Accurate 4064 | <<locked>> | 88% | 56,608 psi | 89% | 3241 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 53,737 psi | 84% | 3274 fps | 99.4% |
| ADI AR 2206H | <<locked>> | 84% | 56,507 psi | 89% | 3278 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 57,667 psi | 90% | 3281 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,738 psi | 87% | 3320 fps | 96.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 55,158 psi | 86% | 3222 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 56,608 psi | 89% | 3199 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 57,203 psi | 90% | 3415 fps | 99.9% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 55,492 psi | 87% | 3310 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 54,636 psi | 86% | 3248 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,897 psi | 86% | 3268 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 96% | 54,897 psi | 86% | 3346 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 92% | 56,420 psi | 88% | 3383 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,665 psi | 86% | 3301 fps | 96.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,194 psi | 71% | 3163 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,953 psi | 81% | 3369 fps | 99.3% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 56,811 psi | 89% | 3294 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 55,390 psi | 87% | 3261 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 55,158 psi | 86% | 3232 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 82% | 56,594 psi | 89% | 3205 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 54,969 psi | 86% | 3248 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 56,159 psi | 88% | 3278 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 94% | 56,753 psi | 89% | 3340 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 92% | 56,637 psi | 89% | 3297 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 84% | 57,116 psi | 90% | 3291 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,100 psi | 86% | 3264 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 57,435 psi | 90% | 3327 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 57,479 psi | 90% | 3379 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,737 psi | 56% | 2070 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,636 psi | 86% | 3235 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 57,406 psi | 90% | 3271 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 57,058 psi | 89% | 3261 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,623 psi | 89% | 3238 fps | 98% |
| IMR 4350 | <<locked>> | 96% | 56,144 psi | 88% | 3264 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 92% | 57,087 psi | 89% | 3271 fps | 98% |
| IMR 4831 | <<locked>> | 96% | 54,520 psi | 85% | 3271 fps | 99.5% |
| IMR 4895 | <<locked>> | 86% | 56,362 psi | 88% | 3304 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 55,158 psi | 86% | 3222 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 56,695 psi | 89% | 3248 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 55,535 psi | 87% | 3199 fps | 99.9% |
| Lovex S062 | <<locked>> | 88% | 57,029 psi | 89% | 3258 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 56,797 psi | 89% | 3261 fps | 99% |
| Lovex S070 | <<locked>> | 94% | 54,375 psi | 85% | 3238 fps | 97.8% |
| Norma 201 | <<locked>> | 84% | 54,810 psi | 86% | 3215 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,680 psi | 87% | 3215 fps | 100% |
| Norma 203B | <<locked>> | 86% | 54,143 psi | 85% | 3251 fps | 99.9% |
| Norma 204 | <<locked>> | 96% | 57,072 psi | 89% | 3317 fps | 96.4% |
| Norma MRPᴾ | <<locked>> | 100% | 51,140 psi | 80% | 3314 fps | 97% |
| Norma URP | <<locked>> | 96% | 56,463 psi | 88% | 3327 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 86% | 55,216 psi | 87% | 3281 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 96% | 55,550 psi | 87% | 3320 fps | 98.6% |
| Ramshot TAC | <<locked>> | 82% | 55,463 psi | 87% | 3238 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 55,521 psi | 87% | 3261 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,187 psi | 57% | 2116 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 56,231 psi | 88% | 3258 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 55,738 psi | 87% | 3343 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,028 psi | 88% | 3383 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,027 psi | 85% | 3304 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 56,971 psi | 89% | 3402 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 55,448 psi | 87% | 3196 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,622 psi | 87% | 3219 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 55,245 psi | 87% | 3255 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,708 psi | 84% | 3281 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 92% | 55,158 psi | 86% | 3232 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 56,797 psi | 89% | 3261 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 84% | 56,695 psi | 89% | 3248 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 57,029 psi | 89% | 3258 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 54,375 psi | 85% | 3238 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 57,479 psi | 90% | 3323 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,143 psi | 85% | 3215 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 54,940 psi | 86% | 3241 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 56,159 psi | 88% | 3153 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 57,043 psi | 89% | 3150 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 56,811 psi | 89% | 3205 fps | 98% |
| Somchem S335 | <<locked>> | 84% | 55,564 psi | 87% | 3143 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 53,882 psi | 84% | 3205 fps | 99.8% |
| Somchem S355 | <<locked>> | 90% | 55,376 psi | 87% | 3251 fps | 100% |
| Somchem S365 | <<locked>> | 98% | 55,347 psi | 87% | 3330 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,360 psi | 85% | 3258 fps | 97.1% |
| Vihtavuori N133 | <<locked>> | 84% | 56,608 psi | 89% | 3136 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 55,608 psi | 87% | 3179 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 56,333 psi | 88% | 3192 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 57,130 psi | 90% | 3232 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,143 psi | 86% | 3261 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 82% | 55,535 psi | 87% | 3219 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 54,737 psi | 86% | 3186 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,259 psi | 85% | 3264 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,459 psi | 79% | 3251 fps | 99.4% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,492 psi | 87% | 3235 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 56,260 psi | 88% | 3274 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 56,971 psi | 89% | 3343 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,683 psi | 64% | 3182 fps | 99.7% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,998 psi | 86% | 3248 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% | 53,417 psi | 84% | 3114 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,905 psi | 72% | 3018 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 48,225 psi | 76% | 3061 fps | 95.4% |
| Accurate 3100 | <<locked>> | 96% | 41,553 psi | 65% | 2999 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 43,439 psi | 68% | 3012 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 37,608 psi | 59% | 2936 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 49,429 psi | 77% | 3153 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 42,003 psi | 66% | 2979 fps | 97.9% |
| ADI AR 2209 | <<locked>> | 98% | 51,996 psi | 81% | 3248 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,605 psi | 81% | 3159 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 52,924 psi | 83% | 3143 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,006 psi | 72% | 3199 fps | 98.7% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 51,982 psi | 81% | 3245 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,090 psi | 66% | 3005 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,991 psi | 71% | 3077 fps | 98.6% |
| Alliant Reloder-16 | 67.7 gr | 84% | 37,014 psi | 58% | 2953 fps | 96% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,709 psi | 58% | 2969 fps | 97.6% |
| Alliant Reloder-19 | <<locked>> | 98% | 51,256 psi | 80% | 3235 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 90% | 32,430 psi | 51% | 2838 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 92% | 38,348 psi | 60% | 3054 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 49,371 psi | 77% | 3159 fps | 98.9% |
| Bofors RP3 | <<locked>> | 80% | 41,989 psi | 66% | 3009 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 48,385 psi | 76% | 3104 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 53,011 psi | 83% | 3146 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 51,387 psi | 81% | 3186 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,656 psi | 67% | 3012 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 46,137 psi | 72% | 3136 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 88% | 49,763 psi | 78% | 3166 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 49,995 psi | 78% | 3166 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 31,995 psi | 50% | 2772 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 46,572 psi | 73% | 3133 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 88% | 45,919 psi | 72% | 3156 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,527 psi | 42% | 1854 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,950 psi | 75% | 3110 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 50,227 psi | 79% | 3159 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,135 psi | 69% | 3022 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,644 psi | 73% | 3048 fps | 95.8% |
| IMR 4350 | <<locked>> | 90% | 46,151 psi | 72% | 3074 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 84% | 44,222 psi | 69% | 3018 fps | 95% |
| IMR 4831 | <<locked>> | 84% | 36,216 psi | 57% | 2887 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 46,166 psi | 72% | 3114 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 51,605 psi | 81% | 3159 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 49,371 psi | 77% | 3130 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,892 psi | 77% | 3081 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 44,048 psi | 69% | 3022 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 41,147 psi | 64% | 2949 fps | 95.7% |
| Lovex S070 | <<locked>> | 88% | 44,802 psi | 70% | 3051 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 48,240 psi | 76% | 3094 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 48,994 psi | 77% | 3107 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,338 psi | 69% | 3061 fps | 98.9% |
| Norma 204 | <<locked>> | 94% | 53,214 psi | 83% | 3248 fps | 95.5% |
| Norma MRP | <<locked>> | 98% | 47,630 psi | 75% | 3238 fps | 96% |
| Norma URP | <<locked>> | 84% | 37,666 psi | 59% | 2940 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 44,657 psi | 70% | 3081 fps | 98.8% |
| Ramshot Hunter | 75.3 gr | 88% | 42,206 psi | 66% | 3054 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 51,779 psi | 81% | 3169 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,764 psi | 81% | 3192 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,006 psi | 42% | 1900 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,931 psi | 67% | 2995 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 48,385 psi | 76% | 3205 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 39,088 psi | 61% | 3045 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 37,536 psi | 59% | 2956 fps | 95.5% |
| ReloadSwiss RS 70 | 75.9 gr | 86% | 39,813 psi | 62% | 3038 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 52,069 psi | 82% | 3140 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,934 psi | 72% | 3041 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 39,320 psi | 62% | 2940 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 98% | 50,024 psi | 78% | 3212 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 88% | 48,385 psi | 76% | 3104 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 41,147 psi | 64% | 2949 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 49,371 psi | 77% | 3130 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,048 psi | 69% | 3022 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 44,802 psi | 70% | 3051 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,683 psi | 64% | 2999 fps | 98% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 50,430 psi | 79% | 3146 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 48,109 psi | 75% | 3117 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,327 psi | 77% | 3041 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,350 psi | 65% | 2884 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 43,497 psi | 68% | 2956 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 49,095 psi | 77% | 3038 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 50,227 psi | 79% | 3140 fps | 99.6% |
| Somchem S355 | <<locked>> | 80% | 40,001 psi | 63% | 2949 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 29,327 psi | 46% | 2746 fps | 96.1% |
| Somchem S385 | <<locked>> | 96% | 47,529 psi | 74% | 3127 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 49,850 psi | 78% | 3031 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,759 psi | 72% | 3015 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,354 psi | 73% | 3028 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,145 psi | 60% | 2874 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 36,666 psi | 57% | 2881 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 52,069 psi | 82% | 3159 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,831 psi | 70% | 3012 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 36,172 psi | 57% | 2877 fps | 95% |
| Vihtavuori N555 | <<locked>> | 90% | 35,766 psi | 56% | 2927 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,866 psi | 53% | 2789 fps | 96.9% |
| Winchester 748 | <<locked>> | 80% | 52,344 psi | 82% | 3212 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 46,325 psi | 73% | 3140 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 92% | 30,850 psi | 48% | 2867 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,863 psi | 75% | 3120 fps | 99.6% |
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 97 powders for .300 Weath. Mag. loaded with the .308 | 135gr | AERO SB | HSD 1.5,- smax:13.10. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,415 fps; across all powders the maximum-charge window runs from 2,070 fps to 3,415 fps. Accurate 3100 gives the best case fill at 100 %, and 97 of the 97 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 135.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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, Ramshot Hunter rank at the top here: for .300 Weath. Mag. with the .308 | 135gr | AERO SB | HSD 1.5,- smax:13.10 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.