Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Steinbock Precision Jagd bullet and 95 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.
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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 2495 | <<locked>> | 84% | 57,276 psi | 90% | 3041 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,013 psi | 86% | 3048 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,721 psi | 83% | 3081 fps | 98.9% |
| Accurate 4064 | <<locked>> | 86% | 57,667 psi | 90% | 3097 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,723 psi | 86% | 3143 fps | 99.8% |
| Accurate High Countryᴾ | <<locked>> | 100% | 57,696 psi | 90% | 3291 fps | 96.8% |
| ADI AR 2206H | <<locked>> | 82% | 56,405 psi | 88% | 3123 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 57,682 psi | 90% | 3130 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,825 psi | 87% | 3179 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,261 psi | 90% | 3261 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 55,999 psi | 88% | 3179 fps | 97.3% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 55,999 psi | 88% | 3179 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,882 psi | 86% | 3097 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,274 psi | 87% | 3123 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,564 psi | 87% | 3209 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 57,000 psi | 89% | 3235 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,201 psi | 87% | 3169 fps | 97.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,243 psi | 82% | 3163 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,284 psi | 77% | 3100 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,989 psi | 67% | 2999 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,043 psi | 89% | 3310 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,637 psi | 89% | 3140 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 55,782 psi | 87% | 3114 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,243 psi | 82% | 3163 fps | 96.8% |
| Bofors RP7 | <<locked>> | 90% | 55,376 psi | 87% | 3094 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 86% | 56,362 psi | 88% | 3130 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 92% | 57,159 psi | 90% | 3199 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 90% | 56,797 psi | 89% | 3156 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 82% | 57,029 psi | 89% | 3133 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,724 psi | 87% | 3123 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,580 psi | 90% | 3173 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 57,696 psi | 90% | 3238 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,260 psi | 57% | 1969 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,578 psi | 86% | 3077 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,740 psi | 90% | 3110 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,058 psi | 89% | 3110 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,347 psi | 88% | 3087 fps | 98.6% |
| IMR 4350 | <<locked>> | 94% | 56,173 psi | 88% | 3123 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,869 psi | 89% | 3120 fps | 98.7% |
| IMR 4831 | <<locked>> | 94% | 55,114 psi | 86% | 3133 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 56,739 psi | 89% | 3153 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 57,116 psi | 90% | 3097 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,376 psi | 87% | 3045 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,392 psi | 90% | 3104 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,971 psi | 89% | 3117 fps | 99.5% |
| Lovex S070 | <<locked>> | 92% | 54,810 psi | 86% | 3104 fps | 98.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,642 psi | 68% | 2913 fps | 97.1% |
| Norma 201 | <<locked>> | 82% | 55,172 psi | 86% | 3064 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,941 psi | 88% | 3064 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,578 psi | 86% | 3107 fps | 100% |
| Norma 204 | <<locked>> | 94% | 57,159 psi | 90% | 3179 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 55,753 psi | 87% | 3258 fps | 98.7% |
| Norma URP | <<locked>> | 94% | 57,087 psi | 89% | 3186 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 55,332 psi | 87% | 3133 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 55,927 psi | 88% | 3182 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,854 psi | 58% | 2011 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,347 psi | 88% | 3114 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,130 psi | 88% | 3192 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,463 psi | 88% | 3228 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,723 psi | 86% | 3166 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,188 psi | 90% | 3258 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 55,782 psi | 87% | 3064 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,840 psi | 88% | 3110 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 57,522 psi | 90% | 3150 fps | 96.4% |
| Rottweil R 905 | <<locked>> | 98% | 54,360 psi | 85% | 3153 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 90% | 55,376 psi | 87% | 3094 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,971 psi | 89% | 3117 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,116 psi | 90% | 3097 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,392 psi | 90% | 3104 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,810 psi | 86% | 3104 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,580 psi | 90% | 3173 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,984 psi | 86% | 3091 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,115 psi | 88% | 2995 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,913 psi | 89% | 2992 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,942 psi | 89% | 3068 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 57,682 psi | 90% | 3212 fps | 97.8% |
| Somchem S335 | <<locked>> | 82% | 55,709 psi | 87% | 2992 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,609 psi | 90% | 3114 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,753 psi | 87% | 3104 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 56,260 psi | 88% | 3189 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,984 psi | 86% | 3127 fps | 98% |
| Vihtavuori N133 | <<locked>> | 82% | 56,623 psi | 89% | 2979 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,202 psi | 88% | 3025 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,463 psi | 88% | 3038 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,232 psi | 90% | 3081 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,637 psi | 87% | 3123 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,821 psi | 80% | 3038 fps | 96.9% |
| Vihtavuori N540 | <<locked>> | 84% | 54,650 psi | 86% | 3031 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,752 psi | 86% | 3127 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,288 psi | 87% | 3186 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,521 psi | 87% | 3091 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,159 psi | 90% | 3199 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,614 psi | 70% | 3146 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,027 psi | 86% | 3097 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,259 psi | 87% | 3120 fps | 97.1% |
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% | 50,212 psi | 79% | 2933 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,124 psi | 75% | 2923 fps | 96.4% |
| Accurate 3100 | <<locked>> | 90% | 37,246 psi | 58% | 2772 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 47,529 psi | 74% | 2936 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,013 psi | 56% | 2766 fps | 96.5% |
| Accurate High Country | <<locked>> | 98% | 53,708 psi | 84% | 3222 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 52,939 psi | 83% | 3064 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,962 psi | 70% | 2900 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 48,921 psi | 77% | 3054 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,530 psi | 78% | 3127 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 48,965 psi | 77% | 3051 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 48,965 psi | 77% | 3051 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,455 psi | 71% | 2930 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,486 psi | 76% | 2999 fps | 99.6% |
| Alliant Reloder-16 | 62.9 gr | 80% | 35,375 psi | 55% | 2779 fps | 96.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,001 psi | 63% | 2917 fps | 99.3% |
| Alliant Reloder-19 | <<locked>> | 94% | 48,327 psi | 76% | 3041 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 96% | 45,745 psi | 72% | 3031 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 84% | 29,399 psi | 46% | 2621 fps | 95.6% |
| Alliant Reloder-25 | <<locked>> | 96% | 37,840 psi | 59% | 2871 fps | 95.9% |
| Alliant Reloder-26 | 74.6 gr | 86% | 34,055 psi | 53% | 2812 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,808 psi | 83% | 3077 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 45,643 psi | 72% | 2940 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 45,745 psi | 72% | 3031 fps | 95% |
| Bofors RP7 | <<locked>> | 82% | 42,931 psi | 67% | 2851 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 46,079 psi | 72% | 2946 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 82% | 40,828 psi | 64% | 2881 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 84% | 46,775 psi | 73% | 2969 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 53,548 psi | 84% | 3077 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,764 psi | 51% | 2667 fps | 97.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,227 psi | 79% | 3054 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 42,902 psi | 67% | 2953 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,977 psi | 42% | 1759 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,213 psi | 80% | 3022 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 54,273 psi | 85% | 3061 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,253 psi | 74% | 2940 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,748 psi | 78% | 2972 fps | 97.5% |
| IMR 4350 | <<locked>> | 86% | 43,671 psi | 68% | 2887 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,785 psi | 65% | 2828 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 34,751 psi | 54% | 2717 fps | 96.2% |
| IMR 4895 | <<locked>> | 80% | 49,748 psi | 78% | 3035 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 53,345 psi | 84% | 3041 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,040 psi | 82% | 2992 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,587 psi | 75% | 2943 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,218 psi | 61% | 2772 fps | 96.2% |
| Lovex S070 | <<locked>> | 82% | 39,929 psi | 63% | 2805 fps | 95.1% |
| Lovex S071 | <<locked>> | 96% | 38,232 psi | 60% | 2795 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 51,793 psi | 81% | 3009 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,475 psi | 82% | 3009 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,863 psi | 75% | 2989 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 49,937 psi | 78% | 3051 fps | 95.8% |
| Norma MRP | <<locked>> | 92% | 41,959 psi | 66% | 2979 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 35,911 psi | 56% | 2762 fps | 96.4% |
| Ramshot Big Game | <<locked>> | 80% | 48,095 psi | 75% | 3005 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 40,045 psi | 63% | 2871 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,572 psi | 43% | 1801 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,151 psi | 72% | 2927 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,301 psi | 82% | 3127 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,496 psi | 67% | 2982 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,766 psi | 56% | 2779 fps | 96% |
| ReloadSwiss RS 70 | 68.7 gr | 80% | 34,925 psi | 55% | 2779 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 49,327 psi | 77% | 2956 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,960 psi | 67% | 2877 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 96% | 53,911 psi | 84% | 3087 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 94% | 47,558 psi | 75% | 3025 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 82% | 42,931 psi | 67% | 2851 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,218 psi | 61% | 2772 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,345 psi | 84% | 3041 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,587 psi | 75% | 2943 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 39,929 psi | 63% | 2805 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,063 psi | 69% | 2933 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,430 psi | 81% | 3031 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,562 psi | 82% | 2943 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,382 psi | 70% | 2795 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 41,089 psi | 64% | 2772 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 47,123 psi | 74% | 3022 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 52,373 psi | 82% | 2940 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,679 psi | 84% | 3051 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,337 psi | 68% | 2881 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 32,474 psi | 51% | 2717 fps | 98.5% |
| Somchem S385 | <<locked>> | 92% | 45,107 psi | 71% | 2943 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 53,113 psi | 83% | 2930 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,429 psi | 77% | 2923 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,719 psi | 78% | 2936 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,350 psi | 65% | 2805 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 37,304 psi | 58% | 2766 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 96% | 44,353 psi | 70% | 2913 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 48,066 psi | 75% | 2923 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,825 psi | 58% | 2762 fps | 96.4% |
| Vihtavuori N555 | <<locked>> | 84% | 32,329 psi | 51% | 2703 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,622 psi | 57% | 2733 fps | 98.7% |
| Winchester 760 | <<locked>> | 82% | 40,828 psi | 64% | 2881 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,760 psi | 44% | 2644 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,459 psi | 81% | 3038 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 47,950 psi | 75% | 2989 fps | 95.4% |
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 95 powders for .300 Weath. Mag. loaded with the .308 | 150gr | Steinbock Precision Jagd. Alliant Reloder-26 delivers the highest muzzle velocity at 3,310 fps; across all powders the maximum-charge window runs from 1,969 fps to 3,310 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, 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. Alliant Reloder-16, ReloadSwiss RS 70, Alliant Reloder-26 rank at the top here: for .300 Weath. Mag. with the .308 | 150gr | Steinbock Precision Jagd 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.