Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Sierra MatchKing bullet and 86 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Alliant Reloder-16.
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>> | 82% | 56,173 psi | 88% | 3031 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,406 psi | 90% | 3100 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,101 psi | 88% | 3146 fps | 99.4% |
| Accurate 4064 | <<locked>> | 84% | 56,753 psi | 89% | 3094 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,114 psi | 85% | 3143 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 86% | 56,623 psi | 89% | 3123 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,027 psi | 86% | 3182 fps | 97.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,623 psi | 89% | 3235 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,246 psi | 88% | 3255 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,450 psi | 90% | 3146 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 57,682 psi | 90% | 3173 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,882 psi | 86% | 3205 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,318 psi | 88% | 3232 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,563 psi | 86% | 3169 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,709 psi | 87% | 3232 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,475 psi | 82% | 3159 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,658 psi | 72% | 3071 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,898 psi | 89% | 3314 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,879 psi | 80% | 3143 fps | 96.6% |
| Bofors RP3 | <<locked>> | 84% | 54,911 psi | 86% | 3110 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,709 psi | 87% | 3232 fps | 97.8% |
| Bofors RP7 | <<locked>> | 88% | 54,186 psi | 85% | 3087 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 84% | 55,274 psi | 87% | 3123 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 56,289 psi | 88% | 3196 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 88% | 55,782 psi | 87% | 3150 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,187 psi | 86% | 3123 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,420 psi | 88% | 3166 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 56,826 psi | 89% | 3235 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,434 psi | 57% | 1988 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,927 psi | 89% | 3130 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,130 psi | 88% | 3107 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,027 psi | 86% | 3081 fps | 98.7% |
| IMR 4350 | <<locked>> | 92% | 55,419 psi | 87% | 3123 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,811 psi | 87% | 3117 fps | 98.7% |
| IMR 4831 | <<locked>> | 92% | 54,592 psi | 86% | 3133 fps | 99.9% |
| IMR 4895 | <<locked>> | 82% | 55,506 psi | 87% | 3143 fps | 100% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,882 psi | 84% | 3202 fps | 96% |
| Lovex S060 | <<locked>> | 82% | 57,464 psi | 90% | 3094 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,289 psi | 88% | 3097 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,173 psi | 88% | 3117 fps | 99.6% |
| Lovex S070 | <<locked>> | 92% | 57,638 psi | 90% | 3163 fps | 99.2% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,514 psi | 73% | 2979 fps | 98.1% |
| Norma 201 | <<locked>> | 82% | 57,450 psi | 90% | 3110 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,971 psi | 89% | 3156 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,217 psi | 88% | 3176 fps | 97.5% |
| Norma MRP | <<locked>> | 98% | 55,390 psi | 87% | 3258 fps | 98.8% |
| Norma URP | <<locked>> | 92% | 56,478 psi | 89% | 3186 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,346 psi | 85% | 3127 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,447 psi | 85% | 3222 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 92% | 55,201 psi | 87% | 3179 fps | 99.3% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,849 psi | 77% | 3081 fps | 97% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,014 psi | 58% | 2034 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,143 psi | 86% | 3107 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,666 psi | 87% | 3222 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,157 psi | 85% | 3163 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,376 psi | 88% | 3255 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,875 psi | 70% | 3091 fps | 96.9% |
| Rottweil R 902 | <<locked>> | 82% | 54,882 psi | 86% | 3061 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,940 psi | 86% | 3107 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,695 psi | 89% | 3153 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 98% | 57,363 psi | 90% | 3215 fps | 98% |
| Rottweil R 907 | <<locked>> | 88% | 54,186 psi | 85% | 3087 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,173 psi | 88% | 3117 fps | 99.6% |
| Shooters World Precision | <<locked>> | 84% | 56,289 psi | 88% | 3097 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,638 psi | 90% | 3163 fps | 99.2% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,637 psi | 89% | 3166 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,421 psi | 90% | 3140 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,854 psi | 88% | 2989 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,796 psi | 87% | 3064 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,869 psi | 89% | 3209 fps | 97.9% |
| Somchem S355 | <<locked>> | 86% | 54,839 psi | 86% | 3100 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 56,057 psi | 88% | 3189 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,534 psi | 85% | 3130 fps | 98.2% |
| Vihtavuori N135 | <<locked>> | 82% | 55,172 psi | 86% | 3022 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,390 psi | 87% | 3031 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,275 psi | 88% | 3074 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,839 psi | 86% | 3123 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,853 psi | 84% | 3100 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 84% | 57,217 psi | 90% | 3077 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 57,725 psi | 90% | 3186 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,172 psi | 86% | 3192 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,578 psi | 86% | 3084 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,507 psi | 89% | 3199 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,906 psi | 75% | 3219 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 57,725 psi | 90% | 3150 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,694 psi | 86% | 3123 fps | 97.3% |
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 2495 | <<locked>> | 80% | 52,765 psi | 83% | 2982 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,314 psi | 79% | 2979 fps | 97.2% |
| Accurate 3100 | <<locked>> | 88% | 37,028 psi | 58% | 2772 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 49,966 psi | 78% | 2986 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,334 psi | 60% | 2825 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 80% | 47,021 psi | 74% | 2953 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 48,312 psi | 76% | 3054 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 98% | 52,910 psi | 83% | 3169 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,344 psi | 82% | 3189 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,674 psi | 75% | 2982 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,879 psi | 80% | 3054 fps | 99.9% |
| Alliant Reloder-16 | 65.9 gr | 80% | 37,130 psi | 58% | 2835 fps | 97.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,308 psi | 66% | 2976 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 90% | 44,846 psi | 70% | 2982 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 94% | 45,469 psi | 71% | 3035 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 82% | 29,066 psi | 46% | 2615 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 92% | 35,302 psi | 55% | 2812 fps | 95.1% |
| Alliant Reloder-26 | 76.4 gr | 84% | 33,765 psi | 53% | 2812 fps | 95.4% |
| Bofors RP15 | <<locked>> | 98% | 47,732 psi | 75% | 3077 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 48,066 psi | 75% | 2992 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 45,469 psi | 71% | 3035 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 42,134 psi | 66% | 2848 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 48,312 psi | 76% | 3002 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 80% | 40,161 psi | 63% | 2874 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 82% | 45,977 psi | 72% | 2966 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,592 psi | 54% | 2720 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,866 psi | 83% | 3107 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 42,192 psi | 66% | 2949 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,209 psi | 43% | 1781 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,388 psi | 84% | 3071 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,458 psi | 78% | 2992 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,663 psi | 81% | 3022 fps | 98.2% |
| IMR 4350 | <<locked>> | 84% | 43,033 psi | 67% | 2884 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,468 psi | 68% | 2877 fps | 96.2% |
| IMR 4831 | <<locked>> | 80% | 36,724 psi | 58% | 2772 fps | 97.1% |
| IMR 4895 | <<locked>> | 80% | 52,214 psi | 82% | 3087 fps | 100% |
| IMR 7828 SSC | <<locked>> | 98% | 50,328 psi | 79% | 3130 fps | 95% |
| Lovex S060 | <<locked>> | 80% | 53,969 psi | 85% | 3035 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,661 psi | 78% | 2989 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,104 psi | 64% | 2825 fps | 97% |
| Lovex S070 | <<locked>> | 80% | 39,305 psi | 62% | 2802 fps | 95.2% |
| Lovex S071 | <<locked>> | 94% | 38,247 psi | 60% | 2799 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 54,085 psi | 85% | 3058 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,256 psi | 79% | 3041 fps | 100% |
| Norma 204 | <<locked>> | 86% | 45,832 psi | 72% | 2979 fps | 95% |
| Norma MRP | 79.4 gr | 90% | 41,669 psi | 65% | 2982 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 37,927 psi | 59% | 2818 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 80% | 50,763 psi | 80% | 3064 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 50,749 psi | 80% | 3150 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 36,927 psi | 58% | 2802 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 98% | 45,295 psi | 71% | 3012 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,644 psi | 43% | 1821 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,399 psi | 76% | 2982 fps | 98.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,947 psi | 70% | 3038 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,058 psi | 60% | 2841 fps | 97.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,927 psi | 58% | 2844 fps | 96.3% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 41,785 psi | 65% | 3015 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 51,416 psi | 81% | 3005 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,150 psi | 71% | 2933 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 49,937 psi | 78% | 3028 fps | 95% |
| Rottweil R 905 | <<locked>> | 92% | 46,963 psi | 74% | 3025 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 42,134 psi | 66% | 2848 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,104 psi | 64% | 2825 fps | 97% |
| Shooters World Precision | <<locked>> | 80% | 49,661 psi | 78% | 2989 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,305 psi | 62% | 2802 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,456 psi | 73% | 2989 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,896 psi | 84% | 3084 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,354 psi | 73% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,248 psi | 63% | 2766 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 46,543 psi | 73% | 3018 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 45,484 psi | 71% | 2933 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 34,461 psi | 54% | 2772 fps | 99.2% |
| Somchem S385 | <<locked>> | 88% | 41,771 psi | 65% | 2881 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 51,822 psi | 81% | 2969 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,909 psi | 81% | 2979 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,395 psi | 68% | 2854 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,436 psi | 62% | 2825 fps | 97.7% |
| Vihtavuori N165 | <<locked>> | 94% | 44,034 psi | 69% | 2917 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 50,241 psi | 79% | 2969 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,841 psi | 61% | 2818 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 82% | 32,271 psi | 51% | 2707 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,566 psi | 60% | 2789 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 40,292 psi | 63% | 2877 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 84% | 27,615 psi | 43% | 2651 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,940 psi | 85% | 3091 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 47,413 psi | 74% | 2992 fps | 95.7% |
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 98 powders for .300 Weath. Mag. loaded with the .308 | 150gr | Sierra MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 3,314 fps; across all powders the maximum-charge window runs from 1,988 fps to 3,314 fps. Accurate 3100 gives the best case fill at 100 %, and 98 of the 98 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 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2225 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. Alliant Reloder-26, Norma MRP, Alliant Reloder-16 rank at the top here: for .300 Weath. Mag. with the .308 | 150gr | Sierra MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2225, Baschieri & Pellagri 109 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.