Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Norma SPFN bullet and 81 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, ReloadSwiss RS 70 and Alliant Reloder-26.
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>> | 82% | 55,521 psi | 87% | 3077 fps | 98.4% |
| Accurate 3100 | <<locked>> | 98% | 54,752 psi | 86% | 3130 fps | 99.4% |
| Accurate 4064 | <<locked>> | 82% | 55,158 psi | 86% | 3071 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,507 psi | 89% | 3182 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 54,984 psi | 86% | 3104 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,435 psi | 90% | 3228 fps | 98% |
| ADI AR 2213 | <<locked>> | 98% | 55,056 psi | 86% | 3219 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,869 psi | 88% | 3127 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,057 psi | 88% | 3150 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,014 psi | 89% | 3245 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 54,795 psi | 86% | 3205 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,913 psi | 89% | 3215 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,375 psi | 85% | 3212 fps | 97.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,288 psi | 87% | 3205 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,819 psi | 75% | 3120 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,724 psi | 87% | 3291 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,359 psi | 84% | 3189 fps | 97.4% |
| Bofors RP3 | <<locked>> | 84% | 56,884 psi | 89% | 3143 fps | 100% |
| Bofors RP5 | <<locked>> | 98% | 54,375 psi | 85% | 3212 fps | 97.7% |
| Bofors RP7 | <<locked>> | 88% | 56,101 psi | 88% | 3127 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 84% | 57,145 psi | 90% | 3159 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 54,853 psi | 86% | 3176 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 86% | 54,215 psi | 85% | 3130 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 57,493 psi | 90% | 3159 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,731 psi | 73% | 3150 fps | 96.6% |
| Hodgdon Superformance | <<locked>> | 88% | 55,071 psi | 86% | 3209 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,492 psi | 57% | 2005 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,375 psi | 85% | 3084 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,811 psi | 89% | 3120 fps | 99.1% |
| IMR 4350 | <<locked>> | 92% | 57,377 psi | 90% | 3163 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,653 psi | 90% | 3156 fps | 99.1% |
| IMR 4831 | <<locked>> | 92% | 56,797 psi | 89% | 3173 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,551 psi | 90% | 3182 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,608 psi | 89% | 3146 fps | 96.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,260 psi | 88% | 3251 fps | 96.8% |
| Lovex S062 | <<locked>> | 82% | 54,607 psi | 86% | 3077 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,621 psi | 86% | 3097 fps | 99.5% |
| Lovex S070 | <<locked>> | 90% | 55,912 psi | 88% | 3140 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,646 psi | 76% | 3022 fps | 98.6% |
| Norma 203B | <<locked>> | 82% | 55,405 psi | 87% | 3133 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,752 psi | 86% | 3156 fps | 97.4% |
| Norma MRP | <<locked>> | 96% | 54,128 psi | 85% | 3238 fps | 98.8% |
| Norma URP | <<locked>> | 90% | 54,911 psi | 86% | 3163 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 82% | 56,391 psi | 88% | 3163 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 57,130 psi | 90% | 3274 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 92% | 57,638 psi | 90% | 3222 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,227 psi | 80% | 3133 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,246 psi | 58% | 2051 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,029 psi | 89% | 3143 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 53,983 psi | 85% | 3199 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,536 psi | 89% | 3205 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,723 psi | 86% | 3232 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,094 psi | 74% | 3150 fps | 97.9% |
| Rottweil R 902 | <<locked>> | 82% | 56,507 psi | 89% | 3094 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,174 psi | 90% | 3143 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,201 psi | 87% | 3133 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 96% | 56,057 psi | 88% | 3196 fps | 98% |
| Rottweil R 907 | <<locked>> | 88% | 56,101 psi | 88% | 3127 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,621 psi | 86% | 3097 fps | 99.5% |
| Shooters World Precision | <<locked>> | 82% | 54,607 psi | 86% | 3077 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,912 psi | 88% | 3140 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,940 psi | 86% | 3143 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,551 psi | 90% | 3018 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,041 psi | 85% | 3041 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,579 psi | 87% | 3192 fps | 97.9% |
| Somchem S355 | <<locked>> | 86% | 56,942 psi | 89% | 3140 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,217 psi | 90% | 3127 fps | 96.2% |
| Somchem S365 | <<locked>> | 92% | 54,708 psi | 86% | 3169 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,855 psi | 89% | 3176 fps | 98.7% |
| Vihtavuori N135 | <<locked>> | 82% | 57,043 psi | 89% | 3051 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,188 psi | 90% | 3064 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 54,737 psi | 86% | 3058 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,043 psi | 89% | 3159 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,260 psi | 88% | 3146 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 82% | 55,332 psi | 87% | 3054 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,188 psi | 88% | 3163 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 98% | 57,580 psi | 90% | 3232 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,855 psi | 89% | 3120 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,853 psi | 86% | 3176 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,343 psi | 80% | 3271 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 57,130 psi | 90% | 3169 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 2700 | <<locked>> | 80% | 52,011 psi | 82% | 3018 fps | 97.8% |
| Accurate 3100 | <<locked>> | 86% | 36,274 psi | 57% | 2753 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 51,793 psi | 81% | 3018 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,900 psi | 63% | 2867 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 80% | 48,530 psi | 76% | 2986 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 47,065 psi | 74% | 3031 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 96% | 51,517 psi | 81% | 3150 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,284 psi | 77% | 3015 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,504 psi | 82% | 3091 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,551 psi | 60% | 2874 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,164 psi | 69% | 3015 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 46,702 psi | 73% | 3022 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 44,367 psi | 70% | 3012 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,427 psi | 45% | 2595 fps | 95.5% |
| Alliant Reloder-25 | <<locked>> | 90% | 34,563 psi | 54% | 2792 fps | 95% |
| Alliant Reloder-26 | 77.3 gr | 82% | 32,953 psi | 52% | 2789 fps | 95.2% |
| Bofors RP15 | <<locked>> | 96% | 46,659 psi | 73% | 3061 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 49,879 psi | 78% | 3028 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 44,367 psi | 70% | 3012 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 43,540 psi | 68% | 2884 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 50,198 psi | 79% | 3041 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 41,872 psi | 66% | 2917 fps | 96.1% |
| Hodgdon H4350 | <<locked>> | 80% | 44,628 psi | 70% | 2940 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,114 psi | 57% | 2756 fps | 98.6% |
| Hodgdon Retumbo | <<locked>> | 98% | 43,845 psi | 69% | 3081 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 40,959 psi | 64% | 2927 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,267 psi | 43% | 1795 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,053 psi | 80% | 3025 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,229 psi | 83% | 3058 fps | 98.6% |
| IMR 4350 | <<locked>> | 82% | 41,771 psi | 65% | 2861 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,991 psi | 71% | 2920 fps | 96.9% |
| IMR 4831 | <<locked>> | 80% | 38,290 psi | 60% | 2812 fps | 97.7% |
| IMR 4895 | <<locked>> | 80% | 53,896 psi | 84% | 3120 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 53,214 psi | 83% | 3087 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 98% | 52,692 psi | 83% | 3186 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 51,300 psi | 80% | 3022 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,511 psi | 67% | 2864 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 40,814 psi | 64% | 2841 fps | 96% |
| Lovex S071 | <<locked>> | 92% | 37,550 psi | 59% | 2785 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 51,880 psi | 81% | 3074 fps | 100% |
| Norma 204 | <<locked>> | 86% | 47,805 psi | 75% | 3025 fps | 95.8% |
| Norma MRP | 80.5 gr | 88% | 40,741 psi | 64% | 2959 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 39,566 psi | 62% | 2861 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 80% | 52,605 psi | 82% | 3100 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 49,414 psi | 77% | 3130 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 38,377 psi | 60% | 2841 fps | 95.8% |
| Ramshot Magnum | <<locked>> | 96% | 44,077 psi | 69% | 2989 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,862 psi | 44% | 1837 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,082 psi | 78% | 3022 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,905 psi | 74% | 3077 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,798 psi | 62% | 2881 fps | 97.7% |
| ReloadSwiss RS 70 | 74.7 gr | 80% | 38,421 psi | 60% | 2887 fps | 97% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 40,857 psi | 64% | 2995 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 53,098 psi | 83% | 3038 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,992 psi | 74% | 2969 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 51,822 psi | 81% | 3071 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 90% | 45,890 psi | 72% | 3005 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 43,540 psi | 68% | 2884 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,511 psi | 67% | 2864 fps | 97.6% |
| Shooters World Precision | <<locked>> | 80% | 51,300 psi | 80% | 3022 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,814 psi | 64% | 2841 fps | 96% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,109 psi | 75% | 3022 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,747 psi | 75% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,669 psi | 65% | 2802 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 45,484 psi | 71% | 2999 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 47,036 psi | 74% | 2966 fps | 99.9% |
| Somchem S361 | <<locked>> | 92% | 53,447 psi | 84% | 3061 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 36,143 psi | 57% | 2812 fps | 99.5% |
| Somchem S385 | <<locked>> | 86% | 40,770 psi | 64% | 2861 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 53,490 psi | 84% | 2999 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,722 psi | 84% | 3012 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,049 psi | 71% | 2890 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,886 psi | 64% | 2858 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 92% | 43,105 psi | 68% | 2900 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 52,054 psi | 82% | 3002 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,495 psi | 63% | 2858 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 80% | 31,647 psi | 50% | 2684 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,147 psi | 63% | 2825 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 41,872 psi | 66% | 2917 fps | 96.1% |
| Winchester StaBALL HD | <<locked>> | 82% | 26,934 psi | 42% | 2625 fps | 95.3% |
| Winchester Supreme 780 | <<locked>> | 92% | 46,180 psi | 72% | 2972 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 | 150gr | Norma SPFN. Alliant Reloder-26 delivers the highest muzzle velocity at 3,291 fps; across all powders the maximum-charge window runs from 2,005 fps to 3,291 fps. ADI AR 2217 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. ADI AR 2217, ADI AR 2225, 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. Norma MRP, ReloadSwiss RS 70, Alliant Reloder-26 rank at the top here: for .300 Weath. Mag. with the .308 | 150gr | Norma SPFN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, 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.