Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 150gr | Norma Kalahari bullet and 91 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-26 and Hodgdon Superformance.
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.
A valid access license is required to use the Personalized Load Calculator.
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% | 54,447 psi | 85% | 3002 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,782 psi | 87% | 3064 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,635 psi | 84% | 3100 fps | 99% |
| Accurate 4064 | <<locked>> | 84% | 54,882 psi | 86% | 3058 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,811 psi | 87% | 3163 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 82% | 57,319 psi | 90% | 3140 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,027 psi | 86% | 3091 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,927 psi | 89% | 3205 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,259 psi | 85% | 3215 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,927 psi | 89% | 3199 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,767 psi | 87% | 3114 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,985 psi | 88% | 3136 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,405 psi | 88% | 3222 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,969 psi | 85% | 3189 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,115 psi | 88% | 3186 fps | 97.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,359 psi | 84% | 3182 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,459 psi | 79% | 3123 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,918 psi | 69% | 3025 fps | 98.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,070 psi | 85% | 3264 fps | 99.9% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,464 psi | 90% | 3159 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,023 psi | 77% | 3097 fps | 95.9% |
| Bofors RP3 | <<locked>> | 86% | 56,710 psi | 89% | 3133 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,359 psi | 84% | 3182 fps | 97.1% |
| Bofors RP7 | <<locked>> | 90% | 56,173 psi | 88% | 3110 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 86% | 57,174 psi | 90% | 3146 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 90% | 54,360 psi | 85% | 3156 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 88% | 54,099 psi | 85% | 3114 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,811 psi | 89% | 3143 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,723 psi | 86% | 3130 fps | 100% |
| Hodgdon Superformance | <<locked>> | 90% | 54,650 psi | 86% | 3189 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,274 psi | 57% | 1972 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,434 psi | 87% | 3094 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,418 psi | 85% | 3071 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,130 psi | 90% | 3107 fps | 98.8% |
| IMR 4350 | <<locked>> | 94% | 57,101 psi | 89% | 3143 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,215 psi | 85% | 3081 fps | 98.3% |
| IMR 4831 | <<locked>> | 94% | 56,159 psi | 88% | 3153 fps | 99.9% |
| IMR 4895 | <<locked>> | 84% | 57,406 psi | 90% | 3166 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 56,028 psi | 88% | 3061 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,781 psi | 86% | 3068 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,317 psi | 85% | 3077 fps | 99.3% |
| Lovex S070 | <<locked>> | 92% | 55,796 psi | 87% | 3123 fps | 98.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,556 psi | 70% | 2933 fps | 97.4% |
| Norma 201 | <<locked>> | 82% | 55,898 psi | 88% | 3077 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,681 psi | 89% | 3077 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,274 psi | 87% | 3120 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,244 psi | 85% | 3130 fps | 96.9% |
| Norma MRPᴾ | <<locked>> | 100% | 56,898 psi | 89% | 3281 fps | 98.9% |
| Norma URP | <<locked>> | 92% | 54,520 psi | 85% | 3146 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 84% | 56,159 psi | 88% | 3146 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 56,898 psi | 89% | 3202 fps | 99.4% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,731 psi | 73% | 3031 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,854 psi | 58% | 2018 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,101 psi | 89% | 3130 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,174 psi | 90% | 3212 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,392 psi | 90% | 3245 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,709 psi | 87% | 3186 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,244 psi | 85% | 3212 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 84% | 56,753 psi | 89% | 3084 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,768 psi | 89% | 3127 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,042 psi | 86% | 3114 fps | 96% |
| Rottweil R 905 | <<locked>> | 98% | 55,347 psi | 87% | 3173 fps | 97.5% |
| Rottweil R 907 | <<locked>> | 90% | 56,173 psi | 88% | 3110 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,317 psi | 85% | 3077 fps | 99.3% |
| Shooters World Precision | <<locked>> | 84% | 54,781 psi | 86% | 3068 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,796 psi | 87% | 3123 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,868 psi | 86% | 3133 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,825 psi | 87% | 3107 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,637 psi | 89% | 3009 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,215 psi | 85% | 2959 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,070 psi | 85% | 3025 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,868 psi | 86% | 3169 fps | 97.4% |
| Somchem S335 | <<locked>> | 82% | 56,362 psi | 88% | 3002 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,623 psi | 89% | 3120 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 57,435 psi | 90% | 3205 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,115 psi | 88% | 3146 fps | 98.3% |
| Vihtavuori N133 | <<locked>> | 82% | 57,101 psi | 89% | 2989 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,000 psi | 89% | 3041 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,348 psi | 90% | 3054 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,491 psi | 85% | 3041 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,623 psi | 89% | 3140 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,677 psi | 81% | 3058 fps | 97.2% |
| Vihtavuori N540 | <<locked>> | 84% | 55,477 psi | 87% | 3045 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,709 psi | 87% | 3143 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,347 psi | 88% | 3205 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,159 psi | 90% | 3264 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,391 psi | 88% | 3107 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,563 psi | 86% | 3159 fps | 98.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,614 psi | 71% | 3173 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,883 psi | 88% | 3114 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,333 psi | 88% | 3140 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 2495 | <<locked>> | 80% | 51,039 psi | 80% | 2949 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,878 psi | 77% | 2940 fps | 96.7% |
| Accurate 3100 | <<locked>> | 90% | 38,159 psi | 60% | 2792 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 48,327 psi | 76% | 2953 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,869 psi | 58% | 2785 fps | 96.9% |
| ADI AR 2206H | <<locked>> | 80% | 53,896 psi | 84% | 3084 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,629 psi | 72% | 2917 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 92% | 46,673 psi | 73% | 3009 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,386 psi | 79% | 3143 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 46,775 psi | 73% | 3012 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,151 psi | 72% | 2946 fps | 99.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,371 psi | 77% | 3022 fps | 99.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,839 psi | 56% | 2795 fps | 96.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,770 psi | 64% | 2936 fps | 99.4% |
| Alliant Reloder-19 | <<locked>> | 92% | 46,209 psi | 72% | 3002 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 96% | 46,630 psi | 73% | 3051 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 84% | 29,892 psi | 47% | 2638 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 94% | 36,216 psi | 57% | 2828 fps | 95.3% |
| Alliant Reloder-26 | 75.8 gr | 86% | 34,795 psi | 55% | 2838 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,621 psi | 84% | 3094 fps | 99.8% |
| Bofors RP15 | <<locked>> | 98% | 45,774 psi | 72% | 3035 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 46,528 psi | 73% | 2959 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 46,630 psi | 73% | 3051 fps | 95.4% |
| Bofors RP7 | <<locked>> | 82% | 43,685 psi | 68% | 2874 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 46,891 psi | 73% | 2966 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 82% | 41,452 psi | 65% | 2897 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 84% | 47,558 psi | 75% | 2989 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,402 psi | 52% | 2684 fps | 97.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,169 psi | 80% | 3071 fps | 100% |
| Hodgdon Superformance | 76.3 gr | 84% | 43,729 psi | 69% | 2976 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,108 psi | 42% | 1765 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,895 psi | 81% | 3038 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,964 psi | 75% | 2956 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,328 psi | 79% | 2986 fps | 97.7% |
| IMR 4350 | <<locked>> | 86% | 44,396 psi | 70% | 2904 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,351 psi | 66% | 2844 fps | 95.6% |
| IMR 4831 | <<locked>> | 80% | 35,360 psi | 55% | 2736 fps | 96.5% |
| IMR 4895 | <<locked>> | 80% | 50,662 psi | 79% | 3054 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 52,721 psi | 83% | 3005 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,312 psi | 76% | 2956 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,813 psi | 62% | 2789 fps | 96.4% |
| Lovex S070 | <<locked>> | 82% | 40,669 psi | 64% | 2825 fps | 95.5% |
| Lovex S071 | <<locked>> | 96% | 39,146 psi | 61% | 2815 fps | 95.9% |
| Norma 201 | <<locked>> | 80% | 52,518 psi | 82% | 3025 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,243 psi | 83% | 3025 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,747 psi | 76% | 3009 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 47,471 psi | 74% | 3005 fps | 95.2% |
| Norma MRP | <<locked>> | 92% | 42,946 psi | 67% | 3009 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 36,550 psi | 57% | 2779 fps | 96.7% |
| Ramshot Big Game | <<locked>> | 80% | 48,950 psi | 77% | 3025 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 38,072 psi | 60% | 2825 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 98% | 43,468 psi | 68% | 2959 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,543 psi | 43% | 1808 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,934 psi | 74% | 2946 fps | 97.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,330 psi | 84% | 3146 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,337 psi | 68% | 3002 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,579 psi | 57% | 2802 fps | 96.4% |
| ReloadSwiss RS 70 | 69.8 gr | 80% | 35,578 psi | 56% | 2802 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 50,053 psi | 78% | 2972 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,656 psi | 68% | 2897 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 94% | 51,430 psi | 81% | 3048 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 92% | 45,194 psi | 71% | 2982 fps | 95% |
| Rottweil R 907 | <<locked>> | 82% | 43,685 psi | 68% | 2874 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,813 psi | 62% | 2789 fps | 96.4% |
| Shooters World Precision | <<locked>> | 80% | 48,312 psi | 76% | 2956 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 40,669 psi | 64% | 2825 fps | 95.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,875 psi | 70% | 2953 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,330 psi | 82% | 3051 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,330 psi | 84% | 2959 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,049 psi | 71% | 2812 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 41,611 psi | 65% | 2785 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 47,863 psi | 75% | 3038 fps | 95.8% |
| Somchem S335 | <<locked>> | 80% | 53,040 psi | 83% | 2953 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,019 psi | 69% | 2894 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 33,083 psi | 52% | 2733 fps | 98.7% |
| Somchem S385 | <<locked>> | 90% | 43,149 psi | 68% | 2904 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 53,853 psi | 84% | 2943 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,256 psi | 79% | 2940 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,430 psi | 79% | 2949 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,989 psi | 66% | 2822 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 38,087 psi | 60% | 2785 fps | 97.1% |
| Vihtavuori N165 | <<locked>> | 96% | 45,353 psi | 71% | 2936 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 48,863 psi | 77% | 2940 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,594 psi | 59% | 2782 fps | 96.7% |
| Vihtavuori N555 | <<locked>> | 82% | 30,922 psi | 48% | 2664 fps | 95.1% |
| Vihtavuori N560 | <<locked>> | 98% | 53,374 psi | 84% | 3196 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,246 psi | 58% | 2749 fps | 98.9% |
| Winchester 760 | <<locked>> | 82% | 41,582 psi | 65% | 2900 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 86% | 28,384 psi | 44% | 2674 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,344 psi | 82% | 3054 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 49,008 psi | 77% | 3015 fps | 95.8% |
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 Kalahari. Norma MRP delivers the highest muzzle velocity at 3,281 fps; across all powders the maximum-charge window runs from 1,972 fps to 3,281 fps. Accurate 3100 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. The 150.0 gr projectile in 0.308" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, 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. ReloadSwiss RS 70, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for .300 Weath. Mag. with the .308 | 150gr | Norma Kalahari 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.