Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 140gr | Barnes X BT bullet and 78 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.
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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 2700 | <<locked>> | 84% | 57,392 psi | 90% | 3169 fps | 97.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,260 psi | 88% | 3219 fps | 99% |
| Accurate 4064 | <<locked>> | 82% | 54,520 psi | 85% | 3133 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,520 psi | 85% | 3222 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 86% | 56,304 psi | 88% | 3192 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 96% | 54,549 psi | 85% | 3241 fps | 96.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,390 psi | 87% | 3320 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,839 psi | 86% | 3241 fps | 96.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,566 psi | 90% | 3225 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,346 psi | 85% | 3192 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 94% | 57,624 psi | 90% | 3330 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,564 psi | 87% | 3301 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 57,406 psi | 90% | 3291 fps | 97.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,984 psi | 86% | 3291 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,127 psi | 82% | 3232 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,629 psi | 72% | 3133 fps | 97.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,057 psi | 88% | 3379 fps | 99.8% |
| Bofors RP3 | <<locked>> | 84% | 55,361 psi | 87% | 3192 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,984 psi | 86% | 3291 fps | 96.8% |
| Bofors RP7 | <<locked>> | 88% | 54,346 psi | 85% | 3156 fps | 97.4% |
| Hodgdon H380 | <<locked>> | 84% | 55,506 psi | 87% | 3199 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 90% | 55,898 psi | 88% | 3261 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 88% | 55,521 psi | 87% | 3219 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,694 psi | 86% | 3196 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,144 psi | 88% | 3238 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 55,956 psi | 88% | 3291 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,651 psi | 57% | 2047 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,797 psi | 89% | 3202 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,912 psi | 88% | 3176 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,100 psi | 86% | 3153 fps | 98.1% |
| IMR 4350 | <<locked>> | 92% | 54,998 psi | 86% | 3186 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,579 psi | 87% | 3186 fps | 98.1% |
| IMR 4831 | <<locked>> | 92% | 54,549 psi | 85% | 3205 fps | 99.7% |
| IMR 4895 | <<locked>> | 82% | 55,666 psi | 87% | 3222 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 57,174 psi | 90% | 3163 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,478 psi | 89% | 3176 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,217 psi | 88% | 3189 fps | 99.2% |
| Lovex S070 | <<locked>> | 92% | 57,595 psi | 90% | 3232 fps | 98.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,239 psi | 74% | 3058 fps | 97.5% |
| Norma 203B | <<locked>> | 84% | 57,116 psi | 90% | 3235 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,738 psi | 87% | 3238 fps | 96.6% |
| Norma MRP | <<locked>> | 98% | 54,723 psi | 86% | 3320 fps | 98.1% |
| Norma URP | <<locked>> | 92% | 56,115 psi | 88% | 3258 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 84% | 57,682 psi | 90% | 3255 fps | 100% |
| Ramshot Hunter | <<locked>> | 92% | 54,781 psi | 86% | 3245 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,304 psi | 58% | 2093 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,172 psi | 86% | 3176 fps | 98.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,897 psi | 86% | 3294 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 57,537 psi | 90% | 3294 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,608 psi | 87% | 3317 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 82% | 55,230 psi | 87% | 3140 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,390 psi | 87% | 3186 fps | 100% |
| Rottweil R 905 | <<locked>> | 98% | 56,956 psi | 89% | 3281 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 88% | 54,346 psi | 85% | 3156 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,217 psi | 88% | 3189 fps | 99.2% |
| Shooters World Precision | <<locked>> | 84% | 56,478 psi | 89% | 3176 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,595 psi | 90% | 3232 fps | 98.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,420 psi | 88% | 3241 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,246 psi | 90% | 3212 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,695 psi | 87% | 3064 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,883 psi | 88% | 3133 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,449 psi | 88% | 3271 fps | 97.1% |
| Somchem S355 | <<locked>> | 86% | 55,259 psi | 87% | 3179 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 55,535 psi | 87% | 3264 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,331 psi | 85% | 3196 fps | 97.5% |
| Vihtavuori N135 | <<locked>> | 82% | 55,463 psi | 87% | 3104 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,361 psi | 87% | 3110 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,362 psi | 88% | 3153 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,752 psi | 86% | 3196 fps | 99.6% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,432 psi | 84% | 3159 fps | 96.9% |
| Vihtavuori N540 | <<locked>> | 84% | 57,290 psi | 90% | 3156 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 57,508 psi | 90% | 3255 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 98% | 54,998 psi | 86% | 3268 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,172 psi | 85% | 3156 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,101 psi | 88% | 3264 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,572 psi | 75% | 3291 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 57,537 psi | 90% | 3225 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,114 psi | 85% | 3179 fps | 96.3% |
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 2700 | <<locked>> | 80% | 50,546 psi | 79% | 3045 fps | 96.4% |
| Accurate 3100 | <<locked>> | 90% | 40,828 psi | 64% | 2920 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 51,401 psi | 81% | 3081 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,334 psi | 62% | 2913 fps | 97% |
| ADI AR 2208 | <<locked>> | 80% | 47,181 psi | 74% | 3025 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 94% | 51,329 psi | 80% | 3179 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,938 psi | 81% | 3258 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 51,430 psi | 81% | 3176 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,906 psi | 75% | 3058 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,068 psi | 80% | 3130 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,637 psi | 59% | 2910 fps | 96.8% |
| Alliant Reloder-17 | 70 gr | 80% | 42,496 psi | 67% | 3051 fps | 99.4% |
| Alliant Reloder-19 | <<locked>> | 94% | 50,836 psi | 80% | 3169 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 48,370 psi | 76% | 3163 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 82% | 30,226 psi | 47% | 2707 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 94% | 38,218 psi | 60% | 2946 fps | 95.3% |
| Alliant Reloder-26 | 77.1 gr | 86% | 36,956 psi | 58% | 2963 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 48,762 psi | 76% | 3074 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 48,370 psi | 76% | 3163 fps | 95.1% |
| Bofors RP7 | <<locked>> | 82% | 45,455 psi | 71% | 2979 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 48,921 psi | 77% | 3081 fps | 98.7% |
| Hodgdon H414 | <<locked>> | 82% | 43,337 psi | 68% | 3012 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 84% | 49,008 psi | 77% | 3091 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,302 psi | 55% | 2799 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,721 psi | 83% | 3182 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 45,527 psi | 71% | 3087 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,543 psi | 43% | 1834 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,345 psi | 84% | 3143 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,632 psi | 78% | 3064 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,764 psi | 81% | 3091 fps | 97.5% |
| IMR 4350 | <<locked>> | 86% | 45,905 psi | 72% | 3009 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,816 psi | 69% | 2946 fps | 95.4% |
| IMR 4831 | <<locked>> | 80% | 37,652 psi | 59% | 2858 fps | 96.6% |
| IMR 4895 | <<locked>> | 80% | 52,315 psi | 82% | 3163 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 53,969 psi | 85% | 3110 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 50,256 psi | 79% | 3071 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,003 psi | 66% | 2907 fps | 96.5% |
| Lovex S070 | <<locked>> | 82% | 42,714 psi | 67% | 2940 fps | 95.4% |
| Lovex S071 | <<locked>> | 94% | 39,305 psi | 62% | 2884 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 50,459 psi | 79% | 3120 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 52,228 psi | 82% | 3173 fps | 95.7% |
| Norma MRP | <<locked>> | 92% | 44,933 psi | 70% | 3123 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 38,638 psi | 61% | 2900 fps | 96.7% |
| Ramshot Big Game | <<locked>> | 80% | 50,676 psi | 79% | 3133 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 39,813 psi | 62% | 2936 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,036 psi | 44% | 1877 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,631 psi | 76% | 3054 fps | 97.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,933 psi | 70% | 3114 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,682 psi | 61% | 2920 fps | 96.5% |
| ReloadSwiss RS 70 | 71.1 gr | 80% | 37,478 psi | 59% | 2917 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 52,127 psi | 82% | 3087 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,108 psi | 72% | 3018 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 94% | 50,111 psi | 79% | 3153 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 82% | 45,455 psi | 71% | 2979 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,003 psi | 66% | 2907 fps | 96.5% |
| Shooters World Precision | <<locked>> | 80% | 50,256 psi | 79% | 3071 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 42,714 psi | 67% | 2940 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,528 psi | 73% | 3061 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,795 psi | 84% | 3156 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,615 psi | 73% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 43,642 psi | 68% | 2897 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 49,661 psi | 78% | 3146 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 46,209 psi | 72% | 3015 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 35,259 psi | 55% | 2858 fps | 98.8% |
| Somchem S385 | <<locked>> | 90% | 45,165 psi | 71% | 3018 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 52,185 psi | 82% | 3051 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,185 psi | 82% | 3061 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,077 psi | 69% | 2936 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 39,871 psi | 62% | 2894 fps | 97% |
| Vihtavuori N165 | <<locked>> | 96% | 47,152 psi | 74% | 3045 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 50,691 psi | 79% | 3051 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,610 psi | 62% | 2897 fps | 96.7% |
| Vihtavuori N555 | <<locked>> | 82% | 33,344 psi | 52% | 2795 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,030 psi | 61% | 2858 fps | 98.9% |
| Winchester 760 | <<locked>> | 82% | 43,337 psi | 68% | 3012 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 28,819 psi | 45% | 2733 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,882 psi | 84% | 3166 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 50,647 psi | 79% | 3117 fps | 95.5% |
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 78 powders for .300 Weath. Mag. loaded with the .308 | 140gr | Barnes X BT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,379 fps; across all powders the maximum-charge window runs from 2,047 fps to 3,379 fps. Accurate 3100 gives the best case fill at 100 %, and 78 of the 78 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 140.0 gr projectile in 0.308" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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 | 140gr | Barnes X BT 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.