Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Sierra Pro-Hunter 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% | 56,231 psi | 88% | 3031 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 57,421 psi | 90% | 3100 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 55,883 psi | 88% | 3140 fps | 99.4% |
| Accurate 4064 | <<locked>> | 84% | 56,768 psi | 89% | 3091 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,128 psi | 85% | 3140 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 86% | 56,666 psi | 89% | 3123 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,071 psi | 86% | 3182 fps | 97.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,681 psi | 89% | 3235 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,086 psi | 88% | 3248 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 55,332 psi | 87% | 3179 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 57,479 psi | 90% | 3146 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 57,725 psi | 90% | 3169 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,897 psi | 86% | 3205 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,115 psi | 88% | 3225 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,607 psi | 86% | 3169 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,724 psi | 87% | 3232 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 52,533 psi | 82% | 3159 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,672 psi | 72% | 3071 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,884 psi | 89% | 3310 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,865 psi | 80% | 3140 fps | 96.6% |
| Bofors RP3 | <<locked>> | 84% | 54,897 psi | 86% | 3107 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,724 psi | 87% | 3232 fps | 97.8% |
| Bofors RP7 | <<locked>> | 88% | 54,230 psi | 85% | 3087 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 84% | 55,288 psi | 87% | 3123 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 56,275 psi | 88% | 3192 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 88% | 55,767 psi | 87% | 3150 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,245 psi | 87% | 3123 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 56,463 psi | 88% | 3163 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 56,884 psi | 89% | 3235 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,434 psi | 57% | 1988 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,971 psi | 89% | 3127 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,956 psi | 88% | 3104 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,071 psi | 86% | 3081 fps | 98.7% |
| IMR 4350 | <<locked>> | 92% | 55,463 psi | 87% | 3120 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,854 psi | 88% | 3117 fps | 98.7% |
| IMR 4831 | <<locked>> | 92% | 54,650 psi | 86% | 3133 fps | 99.9% |
| IMR 4895 | <<locked>> | 82% | 55,492 psi | 87% | 3143 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 57,305 psi | 90% | 3087 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 56,304 psi | 88% | 3100 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,970 psi | 88% | 3114 fps | 99.5% |
| Lovex S070 | <<locked>> | 92% | 57,406 psi | 90% | 3156 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,340 psi | 73% | 2972 fps | 98% |
| Norma 201 | <<locked>> | 82% | 57,493 psi | 90% | 3110 fps | 100% |
| Norma 203B | <<locked>> | 84% | 57,014 psi | 89% | 3156 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,231 psi | 88% | 3176 fps | 97.5% |
| Norma MRP | <<locked>> | 98% | 55,419 psi | 87% | 3258 fps | 98.8% |
| Norma URP | <<locked>> | 92% | 56,304 psi | 88% | 3182 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,186 psi | 85% | 3120 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,505 psi | 85% | 3219 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 92% | 55,201 psi | 87% | 3179 fps | 99.3% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,689 psi | 76% | 3077 fps | 97% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,028 psi | 58% | 2034 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,143 psi | 86% | 3104 fps | 99.1% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 55,651 psi | 87% | 3222 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 53,969 psi | 85% | 3159 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,434 psi | 88% | 3251 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,875 psi | 70% | 3087 fps | 96.9% |
| Rottweil R 902 | <<locked>> | 82% | 54,650 psi | 86% | 3058 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 54,998 psi | 86% | 3104 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 56,753 psi | 89% | 3150 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 98% | 57,421 psi | 90% | 3215 fps | 98% |
| Rottweil R 907 | <<locked>> | 88% | 54,230 psi | 85% | 3087 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,970 psi | 88% | 3114 fps | 99.5% |
| Shooters World Precision | <<locked>> | 84% | 56,304 psi | 88% | 3100 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 57,406 psi | 90% | 3156 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 56,695 psi | 89% | 3166 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 57,435 psi | 90% | 3140 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,898 psi | 88% | 2989 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 55,854 psi | 88% | 3064 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 56,927 psi | 89% | 3209 fps | 97.9% |
| Somchem S355 | <<locked>> | 86% | 54,853 psi | 86% | 3097 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 55,811 psi | 87% | 3186 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,346 psi | 85% | 3123 fps | 98.2% |
| Vihtavuori N135 | <<locked>> | 82% | 55,187 psi | 86% | 3018 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 55,434 psi | 87% | 3031 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,318 psi | 88% | 3074 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,897 psi | 86% | 3120 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,693 psi | 84% | 3097 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 84% | 57,276 psi | 90% | 3077 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,940 psi | 85% | 3120 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 98% | 54,998 psi | 86% | 3189 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,621 psi | 86% | 3084 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,550 psi | 89% | 3199 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 47,863 psi | 75% | 3219 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 57,740 psi | 90% | 3146 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,462 psi | 85% | 3117 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% | 52,823 psi | 83% | 2982 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,357 psi | 79% | 2979 fps | 97.2% |
| Accurate 3100 | <<locked>> | 88% | 37,043 psi | 58% | 2769 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 50,024 psi | 78% | 2986 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,174 psi | 60% | 2822 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 80% | 47,050 psi | 74% | 2953 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 48,356 psi | 76% | 3054 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 98% | 52,953 psi | 83% | 3169 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 52,185 psi | 82% | 3179 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 45,368 psi | 71% | 2986 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,514 psi | 74% | 2976 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,720 psi | 79% | 3051 fps | 99.9% |
| Alliant Reloder-16 | 65.9 gr | 80% | 37,159 psi | 58% | 2835 fps | 97.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,163 psi | 66% | 2969 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 47,877 psi | 75% | 3041 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 94% | 45,310 psi | 71% | 3031 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 82% | 29,095 psi | 46% | 2615 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 92% | 35,302 psi | 55% | 2808 fps | 95.1% |
| Alliant Reloder-26 | 76.3 gr | 84% | 33,649 psi | 53% | 2805 fps | 95.3% |
| Bofors RP15 | <<locked>> | 98% | 47,776 psi | 75% | 3077 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 48,080 psi | 75% | 2992 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 45,310 psi | 71% | 3031 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 42,148 psi | 66% | 2844 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 48,356 psi | 76% | 3002 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 80% | 40,147 psi | 63% | 2871 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 82% | 45,963 psi | 72% | 2963 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,606 psi | 54% | 2717 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,707 psi | 83% | 3104 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 42,235 psi | 66% | 2949 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,209 psi | 43% | 1778 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 53,417 psi | 84% | 3068 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,501 psi | 78% | 2992 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,677 psi | 81% | 3018 fps | 98.2% |
| IMR 4350 | <<locked>> | 84% | 42,902 psi | 67% | 2881 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,482 psi | 68% | 2877 fps | 96.2% |
| IMR 4831 | <<locked>> | 80% | 36,709 psi | 58% | 2772 fps | 97.1% |
| IMR 4895 | <<locked>> | 80% | 52,054 psi | 82% | 3084 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 53,983 psi | 85% | 3035 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,705 psi | 78% | 2989 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,133 psi | 64% | 2825 fps | 97% |
| Lovex S070 | <<locked>> | 80% | 39,320 psi | 62% | 2799 fps | 95.2% |
| Lovex S071 | <<locked>> | 94% | 38,290 psi | 60% | 2799 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 54,099 psi | 85% | 3058 fps | 100% |
| Norma 203B | <<locked>> | 80% | 50,096 psi | 79% | 3038 fps | 100% |
| Norma 204 | <<locked>> | 86% | 45,847 psi | 72% | 2979 fps | 95% |
| Norma MRP | 79.4 gr | 90% | 41,684 psi | 65% | 2979 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 37,956 psi | 59% | 2818 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 80% | 50,546 psi | 79% | 3058 fps | 99.9% |
| Ramshot Grand | <<locked>> | 98% | 50,560 psi | 79% | 3143 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 36,796 psi | 58% | 2795 fps | 95% |
| Ramshot Magnum | <<locked>> | 98% | 45,150 psi | 71% | 3005 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,659 psi | 43% | 1821 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,385 psi | 76% | 2982 fps | 98.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,802 psi | 70% | 3035 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,072 psi | 60% | 2838 fps | 97.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,811 psi | 58% | 2841 fps | 96.2% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 41,843 psi | 66% | 3012 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 51,459 psi | 81% | 3002 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,194 psi | 71% | 2933 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 49,922 psi | 78% | 3028 fps | 95% |
| Rottweil R 905 | <<locked>> | 92% | 47,007 psi | 74% | 3022 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 42,148 psi | 66% | 2844 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,133 psi | 64% | 2825 fps | 97% |
| Shooters World Precision | <<locked>> | 80% | 49,705 psi | 78% | 2989 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,320 psi | 62% | 2799 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,311 psi | 73% | 2986 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,708 psi | 84% | 3081 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,369 psi | 73% | 2841 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,248 psi | 63% | 2762 fps | 95.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 46,586 psi | 73% | 3018 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 45,498 psi | 71% | 2930 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 34,447 psi | 54% | 2769 fps | 99.1% |
| Somchem S385 | <<locked>> | 88% | 41,785 psi | 65% | 2881 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 51,866 psi | 81% | 2969 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,953 psi | 81% | 2979 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,395 psi | 68% | 2854 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,291 psi | 62% | 2818 fps | 97.6% |
| Vihtavuori N165 | <<locked>> | 94% | 44,048 psi | 69% | 2917 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 50,285 psi | 79% | 2969 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,841 psi | 61% | 2818 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 82% | 32,285 psi | 51% | 2703 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,580 psi | 60% | 2789 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 40,321 psi | 63% | 2874 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 84% | 27,528 psi | 43% | 2641 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,925 psi | 85% | 3087 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 47,413 psi | 74% | 2989 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 86 powders for .300 Weath. Mag. loaded with the .308 | 150gr | Sierra Pro-Hunter. Alliant Reloder-26 delivers the highest muzzle velocity at 3,310 fps; across all powders the maximum-charge window runs from 1,988 fps to 3,310 fps. Accurate 3100 gives the best case fill at 100 %, and 86 of the 86 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 1:15.5 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. Alliant Reloder-26, Norma MRP, Alliant Reloder-16 rank at the top here: for .300 Weath. Mag. with the .308 | 150gr | Sierra Pro-Hunter 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.