Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Impala LW CFN bullet and 78 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 ReloadSwiss RS 70.
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% | 55,579 psi | 87% | 3048 fps | 98% |
| Accurate 3100 | <<locked>> | 98% | 54,810 psi | 86% | 3104 fps | 99.2% |
| Accurate 4064 | <<locked>> | 82% | 56,405 psi | 88% | 3061 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,594 psi | 89% | 3163 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 84% | 54,766 psi | 86% | 3071 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,652 psi | 89% | 3189 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,999 psi | 88% | 3104 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,173 psi | 88% | 3123 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,231 psi | 88% | 3209 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 54,012 psi | 85% | 3176 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,072 psi | 88% | 3176 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,421 psi | 90% | 3241 fps | 97.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,375 psi | 85% | 3173 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,500 psi | 74% | 3091 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,650 psi | 86% | 3261 fps | 99.9% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,765 psi | 83% | 3159 fps | 96.9% |
| Bofors RP3 | <<locked>> | 84% | 57,392 psi | 90% | 3123 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,421 psi | 90% | 3241 fps | 97.9% |
| Bofors RP7 | <<locked>> | 88% | 56,231 psi | 88% | 3097 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 84% | 57,276 psi | 90% | 3136 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 54,462 psi | 85% | 3143 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 88% | 57,377 psi | 90% | 3156 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,913 psi | 89% | 3130 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 54,375 psi | 85% | 3176 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 58% | 1978 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,711 psi | 90% | 3110 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,507 psi | 89% | 3084 fps | 98.8% |
| IMR 4350 | <<locked>> | 92% | 56,942 psi | 89% | 3130 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,246 psi | 90% | 3120 fps | 98.8% |
| IMR 4831 | <<locked>> | 92% | 56,623 psi | 89% | 3146 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,595 psi | 90% | 3156 fps | 100% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,448 psi | 87% | 3209 fps | 96.1% |
| Lovex S062 | <<locked>> | 82% | 54,940 psi | 86% | 3054 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,694 psi | 86% | 3071 fps | 99.3% |
| Lovex S070 | <<locked>> | 90% | 56,014 psi | 88% | 3114 fps | 98.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,139 psi | 77% | 3005 fps | 98.4% |
| Norma 203B | <<locked>> | 82% | 55,564 psi | 87% | 3110 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,259 psi | 85% | 3120 fps | 96.9% |
| Norma MRP | <<locked>> | 98% | 57,000 psi | 89% | 3271 fps | 98.9% |
| Norma URP | <<locked>> | 90% | 54,650 psi | 86% | 3133 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 82% | 56,101 psi | 88% | 3133 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,057 psi | 88% | 3225 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 92% | 57,043 psi | 89% | 3192 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,604 psi | 79% | 3094 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,652 psi | 59% | 2028 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,913 psi | 89% | 3114 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,159 psi | 90% | 3232 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,144 psi | 88% | 3179 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,157 psi | 85% | 3196 fps | 99.8% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,818 psi | 73% | 3114 fps | 97.2% |
| Rottweil R 902 | <<locked>> | 82% | 56,956 psi | 89% | 3068 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,435 psi | 90% | 3120 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,737 psi | 86% | 3097 fps | 96% |
| Rottweil R 905 | <<locked>> | 96% | 55,579 psi | 87% | 3163 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 88% | 56,231 psi | 88% | 3097 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,694 psi | 86% | 3071 fps | 99.3% |
| Shooters World Precision | <<locked>> | 82% | 54,940 psi | 86% | 3054 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,014 psi | 88% | 3114 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,853 psi | 86% | 3120 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,334 psi | 90% | 2992 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,711 psi | 90% | 3071 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,100 psi | 86% | 3159 fps | 97.4% |
| Somchem S355 | <<locked>> | 86% | 57,029 psi | 89% | 3114 fps | 100% |
| Somchem S365 | <<locked>> | 92% | 54,259 psi | 85% | 3146 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,362 psi | 88% | 3140 fps | 98.4% |
| Vihtavuori N135 | <<locked>> | 82% | 57,232 psi | 90% | 3028 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,058 psi | 89% | 3035 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 54,795 psi | 86% | 3031 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,565 psi | 89% | 3130 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,535 psi | 87% | 3110 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 82% | 55,419 psi | 87% | 3031 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,144 psi | 88% | 3136 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 98% | 57,522 psi | 90% | 3209 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,058 psi | 89% | 3251 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,101 psi | 88% | 3091 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,592 psi | 86% | 3146 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,763 psi | 78% | 3241 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,347 psi | 88% | 3130 fps | 97.5% |
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% | 52,214 psi | 82% | 2989 fps | 97.4% |
| Accurate 3100 | <<locked>> | 86% | 37,565 psi | 59% | 2762 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 53,156 psi | 83% | 3012 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,988 psi | 64% | 2864 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 80% | 48,646 psi | 76% | 2963 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 90% | 46,833 psi | 73% | 3002 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,559 psi | 78% | 2995 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,750 psi | 83% | 3068 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,015 psi | 61% | 2861 fps | 98% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,121 psi | 69% | 2995 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 46,528 psi | 73% | 2995 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 94% | 47,355 psi | 74% | 3058 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,631 psi | 46% | 2612 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 92% | 37,362 psi | 59% | 2848 fps | 95.9% |
| Alliant Reloder-26 | 72.5 gr | 82% | 33,823 psi | 53% | 2792 fps | 95.2% |
| Bofors RP15 | <<locked>> | 96% | 46,528 psi | 73% | 3035 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 50,546 psi | 79% | 3015 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 47,355 psi | 74% | 3058 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 44,222 psi | 69% | 2867 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 50,430 psi | 79% | 3015 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 42,134 psi | 66% | 2897 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 80% | 44,744 psi | 70% | 2917 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,840 psi | 58% | 2753 fps | 98.6% |
| Hodgdon Superformance | <<locked>> | 80% | 41,234 psi | 65% | 2904 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,688 psi | 43% | 1772 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,184 psi | 80% | 3002 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,301 psi | 84% | 3028 fps | 98.3% |
| IMR 4350 | <<locked>> | 82% | 42,119 psi | 66% | 2841 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,136 psi | 71% | 2894 fps | 96.5% |
| IMR 4831 | <<locked>> | 80% | 39,131 psi | 61% | 2808 fps | 97.7% |
| IMR 4895 | <<locked>> | 80% | 54,056 psi | 85% | 3097 fps | 100% |
| IMR 7828 SSC | <<locked>> | 98% | 52,127 psi | 82% | 3146 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 51,822 psi | 81% | 3002 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,323 psi | 68% | 2851 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 41,655 psi | 65% | 2831 fps | 95.9% |
| Lovex S071 | <<locked>> | 92% | 38,740 psi | 61% | 2789 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 52,141 psi | 82% | 3051 fps | 100% |
| Norma 204 | <<locked>> | 86% | 47,659 psi | 75% | 2995 fps | 95.3% |
| Norma MRP | 75.5 gr | 88% | 40,944 psi | 64% | 2946 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 40,132 psi | 63% | 2848 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 80% | 52,417 psi | 82% | 3071 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 52,344 psi | 82% | 3156 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 38,943 psi | 61% | 2828 fps | 95.7% |
| Ramshot Magnum | <<locked>> | 96% | 44,208 psi | 69% | 2966 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,210 psi | 44% | 1814 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,285 psi | 79% | 2995 fps | 98.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,659 psi | 73% | 3051 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,437 psi | 63% | 2877 fps | 97.7% |
| ReloadSwiss RS 70 | 70.1 gr | 80% | 38,870 psi | 61% | 2874 fps | 96.9% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 41,017 psi | 64% | 2969 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 53,853 psi | 84% | 3018 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,732 psi | 75% | 2956 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 51,532 psi | 81% | 3038 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 90% | 45,948 psi | 72% | 2982 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 44,222 psi | 69% | 2867 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,323 psi | 68% | 2851 fps | 97.4% |
| Shooters World Precision | <<locked>> | 80% | 51,822 psi | 81% | 3002 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,655 psi | 65% | 2831 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,312 psi | 76% | 3002 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,979 psi | 75% | 2848 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,511 psi | 67% | 2789 fps | 96% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 45,527 psi | 71% | 2979 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 47,718 psi | 75% | 2953 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 36,782 psi | 58% | 2808 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 44,063 psi | 69% | 2910 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 80% | 53,838 psi | 84% | 2976 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,795 psi | 84% | 2986 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,556 psi | 71% | 2874 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,394 psi | 65% | 2844 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 94% | 45,876 psi | 72% | 2933 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 52,141 psi | 82% | 2979 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,031 psi | 64% | 2848 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 32,808 psi | 51% | 2697 fps | 96.1% |
| Vihtavuori N560 | <<locked>> | 96% | 53,461 psi | 84% | 3186 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,393 psi | 63% | 2808 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 42,293 psi | 66% | 2900 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 82% | 28,268 psi | 44% | 2648 fps | 95.9% |
| Winchester Supreme 780 | <<locked>> | 92% | 46,035 psi | 72% | 2943 fps | 95% |
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 | Impala LW CFN. Norma MRP delivers the highest muzzle velocity at 3,271 fps; across all powders the maximum-charge window runs from 1,978 fps to 3,271 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 58–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.308" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, 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, ReloadSwiss RS 70 rank at the top here: for .300 Weath. Mag. with the .308 | 150gr | Impala LW CFN 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.