Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Barnes TSX FN FB bullet and 92 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% | 54,288 psi | 85% | 3009 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,028 psi | 88% | 3081 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,244 psi | 85% | 3120 fps | 99.2% |
| Accurate 4064 | <<locked>> | 84% | 54,723 psi | 86% | 3068 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,159 psi | 88% | 3176 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 57,609 psi | 90% | 3156 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,361 psi | 87% | 3104 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,508 psi | 90% | 3225 fps | 97.8% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,317 psi | 87% | 3215 fps | 96.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,824 psi | 86% | 3232 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 57,725 psi | 90% | 3222 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,217 psi | 88% | 3130 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,420 psi | 88% | 3156 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 57,058 psi | 89% | 3241 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,781 psi | 86% | 3209 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,840 psi | 89% | 3209 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,201 psi | 85% | 3205 fps | 97.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,923 psi | 80% | 3136 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,266 psi | 69% | 3045 fps | 98.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,129 psi | 86% | 3284 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,385 psi | 77% | 3114 fps | 96.2% |
| Bofors RP3 | <<locked>> | 86% | 56,913 psi | 89% | 3146 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,201 psi | 85% | 3205 fps | 97.5% |
| Bofors RP7 | <<locked>> | 90% | 56,391 psi | 88% | 3127 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 86% | 57,464 psi | 90% | 3163 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 90% | 54,839 psi | 86% | 3173 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 88% | 54,447 psi | 85% | 3130 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,334 psi | 90% | 3159 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,216 psi | 87% | 3146 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 55,419 psi | 87% | 3212 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,230 psi | 57% | 1985 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,869 psi | 88% | 3114 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,795 psi | 86% | 3087 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,609 psi | 90% | 3127 fps | 99% |
| IMR 4350 | <<locked>> | 92% | 54,099 psi | 85% | 3100 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,824 psi | 86% | 3100 fps | 98.6% |
| IMR 4831 | <<locked>> | 94% | 56,695 psi | 89% | 3169 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,244 psi | 85% | 3127 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,826 psi | 89% | 3143 fps | 96% |
| Lovex S060 | <<locked>> | 82% | 56,289 psi | 88% | 3074 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,766 psi | 86% | 3077 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,694 psi | 86% | 3097 fps | 99.4% |
| Lovex S070 | <<locked>> | 92% | 56,101 psi | 88% | 3140 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,701 psi | 70% | 2946 fps | 97.6% |
| Norma 201 | <<locked>> | 82% | 56,086 psi | 88% | 3094 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,029 psi | 89% | 3091 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,680 psi | 87% | 3140 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,839 psi | 86% | 3153 fps | 97.2% |
| Norma MRP | <<locked>> | 98% | 53,824 psi | 84% | 3235 fps | 98.6% |
| Norma URP | <<locked>> | 92% | 54,984 psi | 86% | 3163 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 56,768 psi | 89% | 3166 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 57,696 psi | 90% | 3222 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,137 psi | 74% | 3051 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,767 psi | 58% | 2031 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,566 psi | 90% | 3146 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,522 psi | 90% | 3228 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,172 psi | 85% | 3202 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 56,246 psi | 88% | 3199 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,969 psi | 86% | 3232 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 56,695 psi | 89% | 3094 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,000 psi | 89% | 3140 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,376 psi | 87% | 3130 fps | 96.3% |
| Rottweil R 905 | <<locked>> | 98% | 55,898 psi | 88% | 3192 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 56,391 psi | 88% | 3127 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,694 psi | 86% | 3097 fps | 99.4% |
| Shooters World Precision | <<locked>> | 84% | 54,766 psi | 86% | 3077 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,101 psi | 88% | 3140 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,230 psi | 87% | 3150 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,057 psi | 88% | 3120 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,884 psi | 89% | 3022 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,563 psi | 86% | 2972 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,375 psi | 85% | 3045 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,419 psi | 87% | 3186 fps | 97.6% |
| Somchem S335 | <<locked>> | 82% | 56,652 psi | 89% | 3018 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,913 psi | 89% | 3136 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 57,580 psi | 90% | 3123 fps | 95.9% |
| Somchem S365 | <<locked>> | 94% | 54,404 psi | 85% | 3166 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,652 psi | 89% | 3166 fps | 98.5% |
| Vihtavuori N133 | <<locked>> | 82% | 57,464 psi | 90% | 3005 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,188 psi | 90% | 3051 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,638 psi | 90% | 3068 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,795 psi | 86% | 3054 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 57,116 psi | 90% | 3159 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,417 psi | 82% | 3077 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 84% | 55,811 psi | 87% | 3061 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 56,217 psi | 88% | 3163 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,985 psi | 89% | 3222 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 57,116 psi | 90% | 3123 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,056 psi | 86% | 3179 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,151 psi | 72% | 3189 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,304 psi | 88% | 3130 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 57,159 psi | 90% | 3166 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% | 50,662 psi | 79% | 2953 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,979 psi | 77% | 2956 fps | 96.9% |
| Accurate 3100 | <<locked>> | 90% | 37,927 psi | 59% | 2799 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 48,037 psi | 75% | 2959 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,608 psi | 57% | 2789 fps | 96.9% |
| ADI AR 2206H | <<locked>> | 80% | 53,998 psi | 85% | 3097 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,803 psi | 72% | 2933 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 92% | 47,036 psi | 74% | 3028 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 98% | 51,605 psi | 81% | 3146 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,966 psi | 80% | 3163 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 47,137 psi | 74% | 3028 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,224 psi | 72% | 2956 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,472 psi | 78% | 3035 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,853 psi | 56% | 2805 fps | 97% |
| Alliant Reloder-17 | 70.7 gr | 80% | 40,930 psi | 64% | 2946 fps | 99.5% |
| Alliant Reloder-19 | <<locked>> | 92% | 46,514 psi | 73% | 3015 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 47,181 psi | 74% | 3074 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 84% | 29,718 psi | 47% | 2641 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 94% | 36,318 psi | 57% | 2841 fps | 95.6% |
| Alliant Reloder-26 | 77.9 gr | 86% | 34,766 psi | 54% | 2841 fps | 95.8% |
| Bofors RP15 | <<locked>> | 98% | 46,253 psi | 72% | 3051 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 46,398 psi | 73% | 2966 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 47,181 psi | 74% | 3074 fps | 95.8% |
| Bofors RP7 | <<locked>> | 82% | 43,613 psi | 68% | 2881 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 47,007 psi | 74% | 2979 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 82% | 41,684 psi | 65% | 2913 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 82% | 44,701 psi | 70% | 2940 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,359 psi | 52% | 2694 fps | 97.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,445 psi | 81% | 3087 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 40,872 psi | 64% | 2920 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,963 psi | 42% | 1775 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,315 psi | 82% | 3054 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,138 psi | 75% | 2969 fps | 99.7% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,618 psi | 79% | 3005 fps | 98% |
| IMR 4350 | <<locked>> | 84% | 41,814 psi | 66% | 2861 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,438 psi | 67% | 2858 fps | 95.9% |
| IMR 4831 | <<locked>> | 80% | 35,346 psi | 55% | 2743 fps | 96.6% |
| IMR 4895 | <<locked>> | 80% | 50,749 psi | 80% | 3064 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 53,229 psi | 83% | 3081 fps | 95.2% |
| Lovex S060 | <<locked>> | 80% | 52,968 psi | 83% | 3022 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,356 psi | 76% | 2969 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,711 psi | 62% | 2799 fps | 96.6% |
| Lovex S070 | <<locked>> | 82% | 40,524 psi | 64% | 2835 fps | 95.6% |
| Lovex S071 | <<locked>> | 94% | 36,521 psi | 57% | 2762 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 52,533 psi | 82% | 3035 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,403 psi | 84% | 3038 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,805 psi | 76% | 3018 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 47,848 psi | 75% | 3022 fps | 95.5% |
| Norma MRP | <<locked>> | 90% | 40,205 psi | 63% | 2949 fps | 95% |
| Norma URP | <<locked>> | 80% | 36,666 psi | 57% | 2792 fps | 96.8% |
| Ramshot Big Game | <<locked>> | 80% | 49,356 psi | 77% | 3041 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 38,101 psi | 60% | 2835 fps | 95.5% |
| Ramshot Magnum | <<locked>> | 98% | 43,671 psi | 68% | 2976 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,514 psi | 43% | 1821 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,021 psi | 74% | 2959 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,708 psi | 84% | 3163 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,540 psi | 68% | 3012 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,535 psi | 57% | 2805 fps | 96.5% |
| ReloadSwiss RS 70 | 71.8 gr | 80% | 35,665 psi | 56% | 2812 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 50,082 psi | 78% | 2986 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,685 psi | 68% | 2907 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 94% | 51,982 psi | 81% | 3071 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 92% | 45,542 psi | 71% | 2999 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 82% | 43,613 psi | 68% | 2881 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,711 psi | 62% | 2799 fps | 96.6% |
| Shooters World Precision | <<locked>> | 80% | 48,356 psi | 76% | 2969 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 40,524 psi | 64% | 2835 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,078 psi | 71% | 2966 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,562 psi | 82% | 3064 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,403 psi | 84% | 2972 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,092 psi | 71% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,870 psi | 61% | 2736 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 45,121 psi | 71% | 2989 fps | 95.1% |
| Somchem S335 | <<locked>> | 80% | 53,142 psi | 83% | 2966 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,961 psi | 69% | 2907 fps | 99.7% |
| Somchem S361 | <<locked>> | 94% | 53,737 psi | 84% | 3061 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 32,982 psi | 52% | 2736 fps | 98.8% |
| Somchem S385 | <<locked>> | 90% | 43,076 psi | 68% | 2913 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 54,012 psi | 85% | 2956 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,285 psi | 79% | 2949 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,734 psi | 80% | 2963 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,134 psi | 66% | 2835 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 38,058 psi | 60% | 2792 fps | 97.2% |
| Vihtavuori N165 | <<locked>> | 96% | 45,701 psi | 72% | 2956 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 80% | 49,052 psi | 77% | 2953 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,565 psi | 59% | 2792 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 82% | 30,690 psi | 48% | 2664 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,318 psi | 58% | 2762 fps | 99% |
| Winchester 760 | <<locked>> | 82% | 41,858 psi | 66% | 2917 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 86% | 28,123 psi | 44% | 2671 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,736 psi | 83% | 3074 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 45,992 psi | 72% | 2966 fps | 95.2% |
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 92 powders for .300 Weath. Mag. loaded with the .308 | 150gr | Barnes TSX FN FB. Alliant Reloder-26 delivers the highest muzzle velocity at 3,284 fps; across all powders the maximum-charge window runs from 1,985 fps to 3,284 fps. Accurate 3100 gives the best case fill at 100 %, and 92 of the 92 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 1:15.0 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, Alliant Reloder-17 rank at the top here: for .300 Weath. Mag. with the .308 | 150gr | Barnes TSX FN FB 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.