Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 155gr | Brenneke TAG bullet and 91 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 Alliant Reloder-17.
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 2495 | <<locked>> | 82% | 54,505 psi | 85% | 2966 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,231 psi | 88% | 3041 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,462 psi | 85% | 3081 fps | 99.4% |
| Accurate 4064 | <<locked>> | 84% | 55,027 psi | 86% | 3025 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,304 psi | 88% | 3136 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,622 psi | 87% | 3064 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 53,983 psi | 85% | 3120 fps | 97.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,506 psi | 87% | 3176 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,071 psi | 86% | 3189 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,347 psi | 88% | 3087 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,536 psi | 89% | 3110 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 57,450 psi | 90% | 3202 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,998 psi | 86% | 3166 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 57,014 psi | 89% | 3169 fps | 98% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,433 psi | 85% | 3169 fps | 97.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 3100 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,440 psi | 70% | 3009 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,347 psi | 87% | 3245 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,748 psi | 78% | 3081 fps | 96.6% |
| Bofors RP3 | <<locked>> | 86% | 57,363 psi | 90% | 3104 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,433 psi | 85% | 3169 fps | 97.7% |
| Bofors RP7 | <<locked>> | 90% | 56,637 psi | 89% | 3087 fps | 98.7% |
| Hodgdon H380 | <<locked>> | 86% | 57,711 psi | 90% | 3123 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 54,998 psi | 86% | 3133 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 88% | 54,723 psi | 86% | 3091 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,070 psi | 85% | 3064 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,361 psi | 87% | 3104 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 55,622 psi | 87% | 3173 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,332 psi | 57% | 1952 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,115 psi | 88% | 3071 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,027 psi | 86% | 3045 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,696 psi | 90% | 3081 fps | 99.1% |
| IMR 4350 | <<locked>> | 92% | 54,259 psi | 85% | 3061 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,998 psi | 86% | 3061 fps | 98.8% |
| IMR 4831 | <<locked>> | 94% | 56,898 psi | 89% | 3130 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,505 psi | 85% | 3084 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 57,145 psi | 90% | 3107 fps | 96.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,721 psi | 83% | 3136 fps | 95.9% |
| Lovex S060 | <<locked>> | 82% | 56,434 psi | 88% | 3031 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,013 psi | 86% | 3035 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,926 psi | 86% | 3054 fps | 99.5% |
| Lovex S070 | <<locked>> | 92% | 56,217 psi | 88% | 3097 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,947 psi | 70% | 2910 fps | 97.9% |
| Norma 201 | <<locked>> | 82% | 56,318 psi | 88% | 3048 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,232 psi | 90% | 3048 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,825 psi | 87% | 3094 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,100 psi | 86% | 3114 fps | 97.5% |
| Norma MRP | <<locked>> | 98% | 53,882 psi | 84% | 3192 fps | 98.8% |
| Norma URP | <<locked>> | 92% | 55,114 psi | 86% | 3120 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 57,058 psi | 89% | 3123 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,113 psi | 83% | 3153 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 92% | 54,012 psi | 85% | 3117 fps | 99.3% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,340 psi | 74% | 3015 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,898 psi | 58% | 1995 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,624 psi | 90% | 3104 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,505 psi | 85% | 3163 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 56,565 psi | 89% | 3159 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,114 psi | 86% | 3189 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,439 psi | 68% | 3022 fps | 96.7% |
| Rottweil R 902 | <<locked>> | 84% | 56,898 psi | 89% | 3048 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,232 psi | 90% | 3097 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,622 psi | 87% | 3091 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 98% | 56,246 psi | 88% | 3156 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 56,637 psi | 89% | 3087 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,926 psi | 86% | 3054 fps | 99.5% |
| Shooters World Precision | <<locked>> | 84% | 55,013 psi | 86% | 3035 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,217 psi | 88% | 3097 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,521 psi | 87% | 3107 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,405 psi | 88% | 3081 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,188 psi | 90% | 2979 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,781 psi | 86% | 2933 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,476 psi | 85% | 3002 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,753 psi | 87% | 3150 fps | 97.9% |
| Somchem S335 | <<locked>> | 82% | 56,826 psi | 89% | 2972 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,319 psi | 90% | 3094 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 57,595 psi | 90% | 3084 fps | 96.2% |
| Somchem S365 | <<locked>> | 94% | 54,650 psi | 86% | 3123 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,869 psi | 89% | 3127 fps | 98.7% |
| Vihtavuori N135 | <<locked>> | 84% | 57,580 psi | 90% | 3009 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,244 psi | 85% | 2972 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,984 psi | 86% | 3015 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 57,290 psi | 90% | 3117 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,620 psi | 82% | 3041 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 84% | 55,985 psi | 88% | 3018 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 56,434 psi | 88% | 3120 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 57,130 psi | 90% | 3179 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 57,290 psi | 90% | 3081 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,216 psi | 87% | 3136 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,296 psi | 73% | 3153 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,695 psi | 89% | 3091 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 57,217 psi | 90% | 3123 fps | 98% |
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% | 50,995 psi | 80% | 2917 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,269 psi | 77% | 2920 fps | 97.2% |
| Accurate 3100 | <<locked>> | 88% | 35,534 psi | 56% | 2703 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 48,385 psi | 76% | 2920 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,796 psi | 58% | 2756 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 80% | 46,064 psi | 72% | 2894 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 47,181 psi | 74% | 2992 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 98% | 51,750 psi | 81% | 3107 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,126 psi | 80% | 3123 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,369 psi | 73% | 2917 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,632 psi | 78% | 2992 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,114 psi | 57% | 2772 fps | 97.4% |
| Alliant Reloder-17 | 69.4 gr | 80% | 41,205 psi | 65% | 2910 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 46,688 psi | 73% | 2979 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 44,063 psi | 69% | 2966 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 82% | 28,007 psi | 44% | 2552 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 94% | 36,463 psi | 57% | 2812 fps | 96.1% |
| Alliant Reloder-26 | 74.6 gr | 84% | 32,401 psi | 51% | 2740 fps | 95% |
| Bofors RP15 | <<locked>> | 98% | 46,383 psi | 73% | 3015 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 46,601 psi | 73% | 2927 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 44,063 psi | 69% | 2966 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 41,046 psi | 64% | 2785 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 47,224 psi | 74% | 2940 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 80% | 38,972 psi | 61% | 2808 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 82% | 44,933 psi | 70% | 2904 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,605 psi | 53% | 2661 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,764 psi | 81% | 3045 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 40,988 psi | 64% | 2887 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,050 psi | 42% | 1745 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,460 psi | 82% | 3012 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,428 psi | 76% | 2933 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,792 psi | 80% | 2966 fps | 98.2% |
| IMR 4350 | <<locked>> | 84% | 42,047 psi | 66% | 2825 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,554 psi | 67% | 2822 fps | 96.2% |
| IMR 4831 | <<locked>> | 80% | 35,520 psi | 56% | 2710 fps | 97% |
| IMR 4895 | <<locked>> | 80% | 50,923 psi | 80% | 3025 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 53,476 psi | 84% | 3045 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 98% | 49,342 psi | 77% | 3074 fps | 95% |
| Lovex S060 | <<locked>> | 80% | 53,040 psi | 83% | 2979 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,486 psi | 76% | 2927 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,958 psi | 63% | 2766 fps | 96.9% |
| Lovex S070 | <<locked>> | 80% | 38,145 psi | 60% | 2740 fps | 95.1% |
| Lovex S071 | <<locked>> | 94% | 36,767 psi | 58% | 2733 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 52,852 psi | 83% | 2995 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,519 psi | 84% | 2992 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,994 psi | 77% | 2979 fps | 100% |
| Norma 204 | <<locked>> | 88% | 47,979 psi | 75% | 2986 fps | 95.9% |
| Norma MRP | <<locked>> | 90% | 40,393 psi | 63% | 2917 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 36,825 psi | 58% | 2756 fps | 97.2% |
| Ramshot Big Game | <<locked>> | 80% | 49,487 psi | 78% | 2999 fps | 99.9% |
| Ramshot Grand | <<locked>> | 98% | 49,327 psi | 77% | 3084 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 82% | 38,363 psi | 60% | 2802 fps | 95.9% |
| Ramshot Magnum | <<locked>> | 98% | 43,947 psi | 69% | 2946 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,456 psi | 43% | 1785 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,297 psi | 74% | 2920 fps | 98% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,830 psi | 69% | 2976 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,796 psi | 58% | 2776 fps | 96.9% |
| ReloadSwiss RS 70 | 70.4 gr | 80% | 35,766 psi | 56% | 2779 fps | 96.1% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 40,524 psi | 64% | 2946 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 50,372 psi | 79% | 2943 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,859 psi | 69% | 2867 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 92% | 48,921 psi | 77% | 2969 fps | 95% |
| Rottweil R 905 | <<locked>> | 92% | 45,861 psi | 72% | 2966 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 41,046 psi | 64% | 2785 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,958 psi | 63% | 2766 fps | 96.9% |
| Shooters World Precision | <<locked>> | 80% | 48,486 psi | 76% | 2927 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,145 psi | 60% | 2740 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,339 psi | 71% | 2927 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,837 psi | 83% | 3025 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,606 psi | 84% | 2927 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,310 psi | 71% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,175 psi | 61% | 2707 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 45,455 psi | 71% | 2956 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 53,461 psi | 84% | 2927 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,280 psi | 69% | 2871 fps | 99.8% |
| Somchem S361 | <<locked>> | 94% | 53,925 psi | 85% | 3022 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 33,286 psi | 52% | 2707 fps | 99% |
| Somchem S385 | <<locked>> | 88% | 40,495 psi | 63% | 2815 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 50,517 psi | 79% | 2907 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,908 psi | 80% | 2923 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,293 psi | 66% | 2795 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,247 psi | 60% | 2759 fps | 97.6% |
| Vihtavuori N165 | <<locked>> | 94% | 42,815 psi | 67% | 2858 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 49,269 psi | 77% | 2910 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,768 psi | 59% | 2759 fps | 97.2% |
| Vihtavuori N555 | <<locked>> | 82% | 30,864 psi | 48% | 2635 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,623 psi | 59% | 2730 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 39,146 psi | 61% | 2812 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 86% | 28,297 psi | 44% | 2648 fps | 96.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,866 psi | 83% | 3028 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 46,238 psi | 72% | 2930 fps | 95.6% |
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 91 powders for .300 Weath. Mag. loaded with the .308 | 155gr | Brenneke TAG. Alliant Reloder-26 delivers the highest muzzle velocity at 3,245 fps; across all powders the maximum-charge window runs from 1,952 fps to 3,245 fps. Accurate 3100 gives the best case fill at 100 %, and 91 of the 91 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 1:12.5 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, Alliant Reloder-17 rank at the top here: for .300 Weath. Mag. with the .308 | 155gr | Brenneke TAG 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.