Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 159gr | Hasler ARIETE bullet and 98 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 and Hodgdon Superformance.
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% | 57,406 psi | 90% | 2966 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,666 psi | 87% | 2989 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,127 psi | 83% | 3018 fps | 99.3% |
| Accurate 4064 | <<locked>> | 84% | 54,230 psi | 85% | 2972 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,274 psi | 87% | 3077 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 57,188 psi | 90% | 3058 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,839 psi | 86% | 3009 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,710 psi | 89% | 3123 fps | 97.9% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,404 psi | 85% | 3114 fps | 96.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,099 psi | 85% | 3130 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,506 psi | 87% | 3031 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,912 psi | 88% | 3054 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,405 psi | 88% | 3143 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,954 psi | 85% | 3110 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,898 psi | 88% | 3110 fps | 97.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,171 psi | 83% | 3107 fps | 97.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,125 psi | 79% | 3041 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,555 psi | 68% | 2953 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,838 psi | 84% | 3182 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,232 psi | 90% | 3074 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,718 psi | 76% | 3025 fps | 96.4% |
| Bofors RP3 | <<locked>> | 86% | 56,347 psi | 88% | 3048 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,171 psi | 83% | 3107 fps | 97.6% |
| Bofors RP7 | <<locked>> | 90% | 55,811 psi | 87% | 3031 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 86% | 56,782 psi | 89% | 3064 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 54,085 psi | 85% | 3077 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 90% | 57,522 psi | 90% | 3094 fps | 98.3% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,159 psi | 90% | 3100 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,565 psi | 89% | 3061 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,578 psi | 86% | 3048 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 54,549 psi | 85% | 3114 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,129 psi | 57% | 1909 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,201 psi | 87% | 3012 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,331 psi | 85% | 2992 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,971 psi | 89% | 3025 fps | 99.1% |
| IMR 4350 | <<locked>> | 94% | 56,913 psi | 89% | 3064 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,696 psi | 90% | 3061 fps | 99.1% |
| IMR 4831 | <<locked>> | 94% | 56,014 psi | 88% | 3074 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,377 psi | 90% | 3087 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,101 psi | 88% | 3048 fps | 96.2% |
| Lovex D073.6 | <<locked>> | 82% | 57,435 psi | 90% | 3025 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,898 psi | 88% | 2979 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,317 psi | 85% | 2982 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,435 psi | 90% | 3054 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 55,288 psi | 87% | 3041 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,961 psi | 69% | 2854 fps | 97.8% |
| Norma 201 | <<locked>> | 82% | 55,506 psi | 87% | 2992 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,463 psi | 88% | 2992 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,187 psi | 86% | 3041 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,085 psi | 85% | 3058 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 56,710 psi | 89% | 3199 fps | 99.2% |
| Norma URP | <<locked>> | 92% | 54,114 psi | 85% | 3064 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 55,970 psi | 88% | 3064 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,025 psi | 82% | 3094 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 94% | 56,826 psi | 89% | 3123 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,412 psi | 73% | 2959 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,898 psi | 58% | 1955 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,840 psi | 89% | 3048 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,014 psi | 89% | 3127 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,450 psi | 90% | 3163 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,521 psi | 87% | 3104 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,998 psi | 85% | 3130 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,540 psi | 67% | 2963 fps | 96.4% |
| Rottweil R 902 | <<locked>> | 84% | 56,144 psi | 88% | 2992 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,449 psi | 88% | 3041 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,868 psi | 86% | 3038 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 98% | 55,042 psi | 86% | 3094 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 55,811 psi | 87% | 3031 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,435 psi | 90% | 3054 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,435 psi | 90% | 3025 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 54,317 psi | 85% | 2982 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,288 psi | 87% | 3041 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,636 psi | 86% | 3051 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,622 psi | 87% | 3025 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,536 psi | 89% | 2927 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,522 psi | 90% | 2927 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,435 psi | 90% | 3009 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,563 psi | 86% | 3087 fps | 97.8% |
| Somchem S335 | <<locked>> | 82% | 56,086 psi | 88% | 2920 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,333 psi | 88% | 3038 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,594 psi | 89% | 3028 fps | 96% |
| Somchem S365 | <<locked>> | 96% | 57,261 psi | 90% | 3123 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,782 psi | 87% | 3071 fps | 98.6% |
| Vihtavuori N133 | <<locked>> | 82% | 57,087 psi | 89% | 2907 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,681 psi | 89% | 2956 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,087 psi | 89% | 2972 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,317 psi | 85% | 2963 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,318 psi | 88% | 3061 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,430 psi | 81% | 2982 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 84% | 55,259 psi | 87% | 2966 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,390 psi | 87% | 3064 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,086 psi | 88% | 3123 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,000 psi | 89% | 3189 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,217 psi | 88% | 3028 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,302 psi | 85% | 3081 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,150 psi | 71% | 3091 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,753 psi | 87% | 3035 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,289 psi | 88% | 3068 fps | 97.8% |
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% | 50,314 psi | 79% | 2864 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,515 psi | 76% | 2864 fps | 97.1% |
| Accurate 3100 | <<locked>> | 90% | 37,333 psi | 59% | 2713 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 47,703 psi | 75% | 2867 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,245 psi | 57% | 2707 fps | 97.2% |
| ADI AR 2206H | <<locked>> | 80% | 53,606 psi | 84% | 3002 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,484 psi | 71% | 2844 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 46,340 psi | 73% | 2936 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 98% | 50,807 psi | 80% | 3048 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,299 psi | 79% | 3064 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,788 psi | 72% | 2864 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,081 psi | 77% | 2940 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,592 psi | 56% | 2723 fps | 97.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,422 psi | 63% | 2858 fps | 99.6% |
| Alliant Reloder-19 | <<locked>> | 92% | 45,861 psi | 72% | 2927 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 43,352 psi | 68% | 2917 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 82% | 27,499 psi | 43% | 2507 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 94% | 35,708 psi | 56% | 2756 fps | 95.8% |
| Alliant Reloder-26 | 73.9 gr | 86% | 34,229 psi | 54% | 2759 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,476 psi | 84% | 3015 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 45,527 psi | 71% | 2959 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 45,861 psi | 72% | 2871 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 43,352 psi | 68% | 2917 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 40,538 psi | 64% | 2736 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 46,369 psi | 73% | 2884 fps | 99% |
| Hodgdon H414 | <<locked>> | 80% | 38,392 psi | 60% | 2759 fps | 95% |
| Hodgdon H4350 | <<locked>> | 82% | 44,353 psi | 70% | 2851 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,345 psi | 84% | 3038 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,040 psi | 52% | 2612 fps | 97.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,894 psi | 80% | 2989 fps | 100% |
| Hodgdon Superformance | 72.7 gr | 82% | 40,379 psi | 63% | 2835 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,905 psi | 42% | 1706 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,721 psi | 81% | 2956 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,819 psi | 75% | 2877 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,183 psi | 79% | 2910 fps | 98.1% |
| IMR 4350 | <<locked>> | 84% | 41,379 psi | 65% | 2772 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,076 psi | 66% | 2772 fps | 96.1% |
| IMR 4831 | <<locked>> | 80% | 34,867 psi | 55% | 2657 fps | 96.8% |
| IMR 4895 | <<locked>> | 80% | 50,372 psi | 79% | 2969 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,605 psi | 82% | 2989 fps | 95.4% |
| Lovex D073.6 | <<locked>> | 80% | 53,766 psi | 84% | 2972 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,460 psi | 82% | 2923 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,819 psi | 75% | 2874 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,450 psi | 62% | 2713 fps | 96.9% |
| Lovex S070 | <<locked>> | 80% | 37,666 psi | 59% | 2690 fps | 95% |
| Lovex S071 | <<locked>> | 94% | 36,027 psi | 56% | 2680 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 52,228 psi | 82% | 2943 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,910 psi | 83% | 2940 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,414 psi | 76% | 2927 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 47,079 psi | 74% | 2930 fps | 95.7% |
| Norma MRP | <<locked>> | 90% | 39,653 psi | 62% | 2861 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 36,289 psi | 57% | 2707 fps | 97.1% |
| Ramshot Big Game | <<locked>> | 80% | 48,733 psi | 76% | 2946 fps | 99.9% |
| Ramshot Grand | <<locked>> | 98% | 48,428 psi | 76% | 3025 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 82% | 37,710 psi | 59% | 2749 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 98% | 43,018 psi | 67% | 2887 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,485 psi | 43% | 1752 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,528 psi | 73% | 2867 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,026 psi | 83% | 3064 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,047 psi | 67% | 2923 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,085 psi | 57% | 2723 fps | 96.8% |
| ReloadSwiss RS 70 | 68.1 gr | 80% | 35,186 psi | 55% | 2726 fps | 96% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,595 psi | 62% | 2887 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 49,705 psi | 78% | 2890 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,265 psi | 68% | 2818 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 94% | 51,358 psi | 80% | 2976 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 92% | 44,947 psi | 70% | 2907 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 40,538 psi | 64% | 2736 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,450 psi | 62% | 2713 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,766 psi | 84% | 2972 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,819 psi | 75% | 2874 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,666 psi | 59% | 2690 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,498 psi | 70% | 2871 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,982 psi | 81% | 2966 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,113 psi | 83% | 2874 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,802 psi | 70% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,580 psi | 60% | 2654 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,585 psi | 70% | 2904 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 52,837 psi | 83% | 2871 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,700 psi | 68% | 2818 fps | 99.8% |
| Somchem S361 | <<locked>> | 94% | 52,852 psi | 83% | 2966 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 32,605 psi | 51% | 2654 fps | 99% |
| Somchem S385 | <<locked>> | 90% | 42,540 psi | 67% | 2825 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 53,708 psi | 84% | 2861 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,951 psi | 78% | 2858 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,314 psi | 79% | 2871 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,742 psi | 65% | 2746 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,724 psi | 59% | 2710 fps | 97.5% |
| Vihtavuori N165 | <<locked>> | 94% | 41,930 psi | 66% | 2802 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 48,443 psi | 76% | 2858 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,014 psi | 58% | 2703 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 82% | 30,356 psi | 48% | 2589 fps | 95.5% |
| Vihtavuori N560 | <<locked>> | 98% | 53,040 psi | 83% | 3117 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,898 psi | 58% | 2677 fps | 99.2% |
| Winchester 760 | <<locked>> | 80% | 38,522 psi | 60% | 2762 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,775 psi | 44% | 2595 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,054 psi | 82% | 2972 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 45,382 psi | 71% | 2877 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 107 powders for .300 Weath. Mag. loaded with the .308 | 159gr | Hasler ARIETE. Norma MRP delivers the highest muzzle velocity at 3,199 fps; across all powders the maximum-charge window runs from 1,909 fps to 3,199 fps. Accurate 3100 gives the best case fill at 100 %, and 107 of the 107 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 159.0 gr projectile in 0.308" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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. ReloadSwiss RS 70, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for .300 Weath. Mag. with the .308 | 159gr | Hasler ARIETE they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2225, Baschieri & Pellagri 109, Bofors RP30 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.