Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Impala LWH CHP bullet and 79 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 2700 | <<locked>> | 82% | 55,434 psi | 87% | 3045 fps | 98% |
| Accurate 3100 | <<locked>> | 98% | 54,781 psi | 86% | 3104 fps | 99.2% |
| Accurate 4064 | <<locked>> | 82% | 56,275 psi | 88% | 3058 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,434 psi | 88% | 3159 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 84% | 54,665 psi | 86% | 3071 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,362 psi | 88% | 3182 fps | 97.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,348 psi | 90% | 3255 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,883 psi | 88% | 3100 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,057 psi | 88% | 3120 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,159 psi | 88% | 3209 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,595 psi | 90% | 3232 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,796 psi | 87% | 3169 fps | 97.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,058 psi | 89% | 3235 fps | 97.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,085 psi | 85% | 3169 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,427 psi | 74% | 3087 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,273 psi | 85% | 3251 fps | 99.9% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,460 psi | 82% | 3153 fps | 96.8% |
| Bofors RP3 | <<locked>> | 84% | 57,029 psi | 89% | 3120 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,058 psi | 89% | 3235 fps | 97.8% |
| Bofors RP7 | <<locked>> | 88% | 55,927 psi | 88% | 3091 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 84% | 57,145 psi | 90% | 3133 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 57,682 psi | 90% | 3199 fps | 99% |
| Hodgdon H4350 | <<locked>> | 88% | 57,232 psi | 90% | 3153 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,797 psi | 89% | 3130 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 54,041 psi | 85% | 3169 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,738 psi | 58% | 1975 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,551 psi | 90% | 3107 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,405 psi | 88% | 3081 fps | 98.7% |
| IMR 4350 | <<locked>> | 92% | 56,652 psi | 89% | 3120 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,130 psi | 90% | 3117 fps | 98.8% |
| IMR 4831 | <<locked>> | 92% | 56,536 psi | 89% | 3143 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,435 psi | 90% | 3153 fps | 100% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,376 psi | 87% | 3205 fps | 96% |
| Lovex S062 | <<locked>> | 82% | 54,810 psi | 86% | 3051 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,578 psi | 86% | 3068 fps | 99.3% |
| Lovex S070 | <<locked>> | 90% | 55,869 psi | 88% | 3110 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,095 psi | 77% | 3005 fps | 98.4% |
| Norma 203B | <<locked>> | 82% | 55,376 psi | 87% | 3107 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,537 psi | 90% | 3176 fps | 97.5% |
| Norma MRP | <<locked>> | 98% | 56,927 psi | 89% | 3268 fps | 98.9% |
| Norma URP | <<locked>> | 90% | 54,534 psi | 85% | 3133 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 82% | 55,709 psi | 87% | 3127 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,956 psi | 88% | 3225 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 92% | 56,710 psi | 89% | 3182 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,546 psi | 79% | 3094 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,637 psi | 59% | 2024 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,811 psi | 89% | 3110 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,985 psi | 89% | 3228 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,825 psi | 87% | 3173 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,682 psi | 90% | 3258 fps | 99.9% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,775 psi | 73% | 3114 fps | 97.2% |
| Rottweil R 902 | <<locked>> | 82% | 56,826 psi | 89% | 3068 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,334 psi | 90% | 3117 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,621 psi | 86% | 3094 fps | 95.9% |
| Rottweil R 905 | <<locked>> | 96% | 55,274 psi | 87% | 3159 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 88% | 55,927 psi | 88% | 3091 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,578 psi | 86% | 3068 fps | 99.3% |
| Shooters World Precision | <<locked>> | 82% | 54,810 psi | 86% | 3051 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,869 psi | 88% | 3110 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,520 psi | 85% | 3114 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,217 psi | 90% | 2989 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,638 psi | 90% | 3071 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,795 psi | 86% | 3153 fps | 97.4% |
| Somchem S355 | <<locked>> | 86% | 56,840 psi | 89% | 3110 fps | 100% |
| Somchem S365 | <<locked>> | 94% | 57,682 psi | 90% | 3196 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,318 psi | 88% | 3140 fps | 98.3% |
| Vihtavuori N135 | <<locked>> | 82% | 57,072 psi | 89% | 3025 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,942 psi | 89% | 3035 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 54,636 psi | 86% | 3028 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,420 psi | 88% | 3127 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,274 psi | 87% | 3104 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 82% | 55,332 psi | 87% | 3028 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,782 psi | 87% | 3133 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 98% | 57,145 psi | 90% | 3202 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,985 psi | 89% | 3248 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,796 psi | 87% | 3084 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,317 psi | 85% | 3140 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,530 psi | 78% | 3238 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,043 psi | 88% | 3123 fps | 97.4% |
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% | 52,083 psi | 82% | 2986 fps | 97.4% |
| Accurate 3100 | <<locked>> | 86% | 37,318 psi | 58% | 2756 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 53,011 psi | 83% | 3009 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,872 psi | 64% | 2861 fps | 98% |
| ADI AR 2208 | <<locked>> | 80% | 48,530 psi | 76% | 2959 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 90% | 46,702 psi | 73% | 2999 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,664 psi | 84% | 3189 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,429 psi | 77% | 2989 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,591 psi | 82% | 3061 fps | 99.9% |
| Alliant Reloder-16 | 63.9 gr | 80% | 38,899 psi | 61% | 2854 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,990 psi | 69% | 2992 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 46,398 psi | 73% | 2992 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 47,050 psi | 74% | 3048 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,544 psi | 46% | 2608 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 92% | 37,173 psi | 58% | 2841 fps | 95.8% |
| Alliant Reloder-26 | 72.3 gr | 82% | 33,707 psi | 53% | 2785 fps | 95.1% |
| Bofors RP15 | <<locked>> | 96% | 46,470 psi | 73% | 3035 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 50,343 psi | 79% | 3009 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 47,050 psi | 74% | 3048 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 44,077 psi | 69% | 2864 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 50,328 psi | 79% | 3015 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 42,032 psi | 66% | 2894 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 80% | 44,643 psi | 70% | 2910 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,724 psi | 58% | 2749 fps | 98.6% |
| Hodgdon Superformance | <<locked>> | 82% | 43,947 psi | 69% | 2969 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,630 psi | 43% | 1768 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,053 psi | 80% | 2999 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,200 psi | 83% | 3025 fps | 98.3% |
| IMR 4350 | <<locked>> | 82% | 42,032 psi | 66% | 2838 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,034 psi | 71% | 2887 fps | 96.5% |
| IMR 4831 | <<locked>> | 80% | 39,015 psi | 61% | 2805 fps | 97.7% |
| IMR 4895 | <<locked>> | 80% | 53,925 psi | 85% | 3094 fps | 100% |
| IMR 7828 SSC | <<locked>> | 98% | 51,837 psi | 81% | 3136 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 51,677 psi | 81% | 2999 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,221 psi | 68% | 2848 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 41,553 psi | 65% | 2825 fps | 95.8% |
| Lovex S071 | <<locked>> | 92% | 38,609 psi | 61% | 2785 fps | 95.7% |
| Norma 203B | <<locked>> | 80% | 52,025 psi | 82% | 3051 fps | 100% |
| Norma 204 | <<locked>> | 86% | 47,311 psi | 74% | 2989 fps | 95.2% |
| Norma MRP | 75.3 gr | 88% | 40,872 psi | 64% | 2943 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 40,016 psi | 63% | 2844 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 80% | 52,315 psi | 82% | 3071 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 52,228 psi | 82% | 3156 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 38,783 psi | 61% | 2825 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 96% | 43,947 psi | 69% | 2959 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,166 psi | 44% | 1811 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,995 psi | 78% | 2989 fps | 98.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,514 psi | 73% | 3051 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,147 psi | 63% | 2867 fps | 97.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,740 psi | 61% | 2867 fps | 96.8% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 43,627 psi | 68% | 3038 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 53,722 psi | 84% | 3015 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,616 psi | 75% | 2953 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 92% | 51,401 psi | 81% | 3035 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 90% | 45,847 psi | 72% | 2979 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 44,077 psi | 69% | 2864 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,221 psi | 68% | 2848 fps | 97.4% |
| Shooters World Precision | <<locked>> | 80% | 51,677 psi | 81% | 2999 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,553 psi | 65% | 2825 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,182 psi | 76% | 3002 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,877 psi | 75% | 2844 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,424 psi | 66% | 2785 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 45,440 psi | 71% | 2976 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 47,587 psi | 75% | 2949 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 36,666 psi | 57% | 2808 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 43,976 psi | 69% | 2907 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 53,664 psi | 84% | 2976 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,679 psi | 84% | 2986 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,440 psi | 71% | 2871 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,292 psi | 65% | 2841 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 45,818 psi | 72% | 2933 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 51,996 psi | 81% | 2976 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,872 psi | 64% | 2841 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 80% | 32,692 psi | 51% | 2694 fps | 96% |
| Vihtavuori N560 | <<locked>> | 96% | 53,388 psi | 84% | 3182 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,263 psi | 63% | 2805 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 42,192 psi | 66% | 2897 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 82% | 28,079 psi | 44% | 2641 fps | 95.7% |
| Winchester Supreme 780 | <<locked>> | 92% | 45,977 psi | 72% | 2940 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 79 powders for .300 Weath. Mag. loaded with the .308 | 150gr | Impala LWH CHP. Norma MRP delivers the highest muzzle velocity at 3,268 fps; across all powders the maximum-charge window runs from 1,975 fps to 3,268 fps. Alliant Reloder-22 gives the best case fill at 100 %, and 79 of the 79 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 1:12.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-22, Alliant Reloder-23, Alliant Reloder-25 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 | Impala LWH CHP 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.