Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 155gr | CutEdge MTAC bullet and 97 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% | 57,305 psi | 90% | 3002 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,405 psi | 87% | 3022 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,214 psi | 83% | 3054 fps | 99.2% |
| Accurate 4064 | <<locked>> | 86% | 57,740 psi | 90% | 3061 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,332 psi | 87% | 3114 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 56,869 psi | 89% | 3091 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,708 psi | 86% | 3041 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,637 psi | 89% | 3159 fps | 97.8% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,462 psi | 85% | 3150 fps | 96% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,041 psi | 85% | 3166 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,535 psi | 87% | 3068 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,753 psi | 87% | 3091 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,231 psi | 88% | 3179 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,766 psi | 84% | 3143 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,811 psi | 87% | 3143 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,229 psi | 83% | 3143 fps | 97.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,024 psi | 78% | 3074 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,424 psi | 68% | 2979 fps | 98.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 53,751 psi | 84% | 3215 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,203 psi | 90% | 3110 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,588 psi | 76% | 3054 fps | 96.2% |
| Bofors RP3 | <<locked>> | 86% | 56,347 psi | 88% | 3084 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,229 psi | 83% | 3143 fps | 97.4% |
| Bofors RP7 | <<locked>> | 90% | 55,738 psi | 87% | 3064 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 86% | 56,782 psi | 89% | 3100 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 54,143 psi | 85% | 3110 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 90% | 57,392 psi | 90% | 3130 fps | 98.2% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,203 psi | 90% | 3136 fps | 96% |
| Hodgdon H4895 | <<locked>> | 82% | 57,508 psi | 90% | 3100 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,608 psi | 89% | 3097 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,404 psi | 85% | 3081 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 54,360 psi | 85% | 3146 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,216 psi | 57% | 1939 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,085 psi | 86% | 3048 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,609 psi | 90% | 3077 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,840 psi | 89% | 3061 fps | 99% |
| IMR 4350 | <<locked>> | 94% | 56,942 psi | 89% | 3100 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,624 psi | 90% | 3097 fps | 99% |
| IMR 4831 | <<locked>> | 94% | 55,825 psi | 87% | 3107 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,217 psi | 90% | 3123 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,043 psi | 88% | 3084 fps | 96% |
| Lovex D073.6 | <<locked>> | 82% | 57,493 psi | 90% | 3064 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,666 psi | 87% | 3012 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,186 psi | 85% | 3018 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,348 psi | 90% | 3087 fps | 99.7% |
| Lovex S070 | <<locked>> | 92% | 55,390 psi | 87% | 3077 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,961 psi | 69% | 2887 fps | 97.6% |
| Norma 201 | <<locked>> | 82% | 55,448 psi | 87% | 3031 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,405 psi | 88% | 3031 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,013 psi | 86% | 3074 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,114 psi | 85% | 3091 fps | 97.2% |
| Norma MRPᴾ | <<locked>> | 100% | 56,652 psi | 89% | 3235 fps | 99.1% |
| Norma URP | <<locked>> | 92% | 54,215 psi | 85% | 3100 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 55,898 psi | 88% | 3100 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 56,768 psi | 89% | 3156 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,340 psi | 73% | 2989 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,767 psi | 58% | 1985 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,782 psi | 89% | 3084 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,782 psi | 89% | 3163 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,246 psi | 90% | 3199 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,245 psi | 87% | 3136 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,911 psi | 84% | 3166 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 56,101 psi | 88% | 3031 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,231 psi | 88% | 3077 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,650 psi | 86% | 3068 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 98% | 54,969 psi | 86% | 3127 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 55,738 psi | 87% | 3064 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,348 psi | 90% | 3087 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,493 psi | 90% | 3064 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 54,186 psi | 85% | 3018 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,390 psi | 87% | 3077 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,592 psi | 86% | 3087 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,463 psi | 87% | 3061 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,333 psi | 88% | 2959 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,435 psi | 90% | 2963 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,246 psi | 90% | 3041 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,491 psi | 85% | 3120 fps | 97.6% |
| Somchem S335 | <<locked>> | 82% | 56,057 psi | 88% | 2956 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,376 psi | 88% | 3074 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,594 psi | 89% | 3061 fps | 95.8% |
| Somchem S365 | <<locked>> | 96% | 57,217 psi | 90% | 3159 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,637 psi | 87% | 3104 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 82% | 56,927 psi | 89% | 2943 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,652 psi | 89% | 2992 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,971 psi | 89% | 3005 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,070 psi | 85% | 2992 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,376 psi | 88% | 3097 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,532 psi | 81% | 3015 fps | 97.4% |
| Vihtavuori N540 | <<locked>> | 84% | 55,274 psi | 87% | 3002 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,390 psi | 87% | 3097 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,985 psi | 88% | 3156 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,971 psi | 89% | 3222 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,362 psi | 88% | 3064 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,143 psi | 85% | 3110 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,150 psi | 71% | 3127 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,753 psi | 87% | 3068 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,072 psi | 88% | 3100 fps | 97.7% |
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% | 50,096 psi | 79% | 2897 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,428 psi | 76% | 2897 fps | 96.9% |
| Accurate 3100 | <<locked>> | 90% | 37,260 psi | 58% | 2743 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 47,471 psi | 74% | 2900 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,027 psi | 56% | 2733 fps | 96.9% |
| ADI AR 2206H | <<locked>> | 80% | 53,374 psi | 84% | 3035 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,295 psi | 71% | 2874 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 92% | 46,398 psi | 73% | 2969 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 98% | 50,691 psi | 79% | 3081 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,299 psi | 79% | 3100 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,774 psi | 72% | 2900 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,849 psi | 77% | 2972 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,433 psi | 56% | 2749 fps | 97.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,321 psi | 63% | 2890 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 92% | 45,890 psi | 72% | 2959 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 46,325 psi | 73% | 3012 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 84% | 29,356 psi | 46% | 2592 fps | 96.1% |
| Alliant Reloder-25 | <<locked>> | 94% | 35,752 psi | 56% | 2789 fps | 95.6% |
| Alliant Reloder-26 | 75.1 gr | 86% | 34,084 psi | 53% | 2785 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,505 psi | 84% | 3051 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 45,469 psi | 71% | 2992 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 45,818 psi | 72% | 2907 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 46,325 psi | 73% | 3012 fps | 95.7% |
| Bofors RP7 | <<locked>> | 82% | 43,091 psi | 68% | 2825 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 46,296 psi | 73% | 2917 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 82% | 41,118 psi | 64% | 2854 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 82% | 44,251 psi | 69% | 2884 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,272 psi | 83% | 3071 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 53,969 psi | 85% | 3045 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,909 psi | 52% | 2638 fps | 97.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,749 psi | 80% | 3025 fps | 100% |
| Hodgdon Superformance | 73.9 gr | 82% | 40,263 psi | 63% | 2864 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,948 psi | 42% | 1736 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,677 psi | 81% | 2992 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,645 psi | 75% | 2910 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,111 psi | 79% | 2943 fps | 98% |
| IMR 4350 | <<locked>> | 84% | 41,263 psi | 65% | 2802 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,887 psi | 66% | 2799 fps | 95.9% |
| IMR 4831 | <<locked>> | 80% | 34,809 psi | 55% | 2687 fps | 96.6% |
| IMR 4895 | <<locked>> | 80% | 50,111 psi | 79% | 3002 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,605 psi | 82% | 3022 fps | 95.2% |
| Lovex D073.6 | <<locked>> | 80% | 53,650 psi | 84% | 3005 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,504 psi | 82% | 2963 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,863 psi | 75% | 2913 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,291 psi | 62% | 2743 fps | 96.6% |
| Lovex S070 | <<locked>> | 82% | 40,001 psi | 63% | 2779 fps | 95.6% |
| Lovex S071 | <<locked>> | 94% | 35,810 psi | 56% | 2707 fps | 95% |
| Norma 201 | <<locked>> | 80% | 52,011 psi | 82% | 2976 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,924 psi | 83% | 2979 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,196 psi | 76% | 2959 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 47,166 psi | 74% | 2963 fps | 95.5% |
| Norma MRP | <<locked>> | 90% | 39,494 psi | 62% | 2890 fps | 95% |
| Norma URP | <<locked>> | 80% | 36,100 psi | 57% | 2733 fps | 96.8% |
| Ramshot Big Game | <<locked>> | 80% | 48,762 psi | 76% | 2982 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 37,550 psi | 59% | 2779 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 98% | 43,004 psi | 67% | 2920 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,340 psi | 43% | 1775 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,427 psi | 73% | 2897 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,910 psi | 83% | 3100 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,902 psi | 67% | 2953 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,940 psi | 56% | 2753 fps | 96.5% |
| ReloadSwiss RS 70 | 69.3 gr | 80% | 35,201 psi | 55% | 2759 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 49,545 psi | 78% | 2927 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,076 psi | 68% | 2848 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 94% | 51,184 psi | 80% | 3009 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 92% | 44,860 psi | 70% | 2940 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 82% | 43,091 psi | 68% | 2825 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,291 psi | 62% | 2743 fps | 96.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,650 psi | 84% | 3005 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,863 psi | 75% | 2913 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 40,001 psi | 63% | 2779 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,396 psi | 70% | 2904 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,880 psi | 81% | 3002 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,982 psi | 83% | 2913 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,730 psi | 70% | 2769 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,537 psi | 60% | 2684 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,454 psi | 70% | 2930 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 52,663 psi | 83% | 2907 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,511 psi | 68% | 2848 fps | 99.7% |
| Somchem S361 | <<locked>> | 94% | 52,895 psi | 83% | 2999 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 32,576 psi | 51% | 2684 fps | 98.8% |
| Somchem S385 | <<locked>> | 90% | 42,438 psi | 67% | 2858 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 53,592 psi | 84% | 2897 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,806 psi | 78% | 2890 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,096 psi | 79% | 2904 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,553 psi | 65% | 2776 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 37,521 psi | 59% | 2736 fps | 97.3% |
| Vihtavuori N165 | <<locked>> | 96% | 44,860 psi | 70% | 2894 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 48,356 psi | 76% | 2890 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,956 psi | 58% | 2736 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 82% | 30,153 psi | 47% | 2608 fps | 95.1% |
| Vihtavuori N560 | <<locked>> | 98% | 53,084 psi | 83% | 3153 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,927 psi | 58% | 2710 fps | 99.1% |
| Winchester 760 | <<locked>> | 82% | 41,292 psi | 65% | 2858 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 86% | 27,702 psi | 43% | 2621 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,098 psi | 82% | 3012 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 45,150 psi | 71% | 2904 fps | 95.1% |
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 | 155gr | CutEdge MTAC. Norma MRP delivers the highest muzzle velocity at 3,235 fps; across all powders the maximum-charge window runs from 1,939 fps to 3,235 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 57–90 %, leaving at least 10 % headroom. The 155.0 gr projectile in 0.308" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, 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. ReloadSwiss RS 70, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for .300 Weath. Mag. with the .308 | 155gr | CutEdge MTAC 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.