Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 166gr | Hammer Stone Hammer bullet and 89 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 2495 | <<locked>> | 82% | 56,434 psi | 88% | 2894 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,418 psi | 85% | 2923 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,637 psi | 89% | 3022 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 57,014 psi | 89% | 2953 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,839 psi | 86% | 3015 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 55,535 psi | 87% | 3114 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 86% | 57,421 psi | 90% | 2992 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,173 psi | 88% | 3068 fps | 98.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 57,508 psi | 90% | 3123 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,217 psi | 90% | 3123 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 56,231 psi | 88% | 3061 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,737 psi | 86% | 2963 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,897 psi | 86% | 2986 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,912 psi | 88% | 3081 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,406 psi | 90% | 3104 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,477 psi | 87% | 3054 fps | 98.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,652 psi | 89% | 3114 fps | 98.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,635 psi | 84% | 3038 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,354 psi | 73% | 2963 fps | 99.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 53,896 psi | 84% | 3127 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,924 psi | 81% | 3031 fps | 97.7% |
| Bofors RP3 | <<locked>> | 84% | 55,608 psi | 87% | 2979 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,652 psi | 89% | 3114 fps | 98.6% |
| Bofors RP7 | <<locked>> | 88% | 55,027 psi | 86% | 2966 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 84% | 55,898 psi | 88% | 2999 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 57,174 psi | 90% | 3074 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 88% | 56,840 psi | 89% | 3035 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 98% | 57,725 psi | 90% | 3064 fps | 96.9% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,507 psi | 89% | 3045 fps | 96.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,246 psi | 88% | 2999 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,508 psi | 90% | 3035 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,368 psi | 71% | 2999 fps | 97% |
| Hodgdon Superformance | <<locked>> | 88% | 53,780 psi | 84% | 3051 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,347 psi | 57% | 1880 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,768 psi | 89% | 2976 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,724 psi | 87% | 2956 fps | 99.3% |
| IMR 4350 | <<locked>> | 92% | 56,159 psi | 88% | 3002 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,637 psi | 89% | 2995 fps | 99.3% |
| IMR 4831 | <<locked>> | 92% | 55,274 psi | 87% | 3009 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,362 psi | 88% | 3015 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,463 psi | 87% | 2992 fps | 96.7% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,897 psi | 86% | 3091 fps | 97.2% |
| Lovex S062 | <<locked>> | 84% | 57,029 psi | 89% | 2966 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,724 psi | 89% | 2989 fps | 99.9% |
| Lovex S070 | <<locked>> | 90% | 54,621 psi | 86% | 2979 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,847 psi | 73% | 2861 fps | 98.8% |
| Norma 203B | <<locked>> | 84% | 57,740 psi | 90% | 3025 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,290 psi | 90% | 3061 fps | 98.4% |
| Norma MRP | <<locked>> | 98% | 56,507 psi | 89% | 3143 fps | 99.5% |
| Norma URP | <<locked>> | 92% | 57,232 psi | 90% | 3058 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,027 psi | 86% | 2995 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,593 psi | 87% | 3114 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 92% | 56,246 psi | 88% | 3061 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,647 psi | 78% | 2979 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,130 psi | 58% | 1926 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,898 psi | 88% | 2982 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,826 psi | 89% | 3091 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,911 psi | 86% | 3038 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 57,363 psi | 90% | 3130 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,397 psi | 71% | 2989 fps | 98.1% |
| Rottweil R 902 | <<locked>> | 82% | 55,303 psi | 87% | 2927 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,724 psi | 87% | 2976 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,696 psi | 90% | 3038 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 96% | 54,679 psi | 86% | 3038 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 88% | 55,027 psi | 86% | 2966 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,724 psi | 89% | 2989 fps | 99.9% |
| Shooters World Precision | <<locked>> | 84% | 57,029 psi | 89% | 2966 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,621 psi | 86% | 2979 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,464 psi | 90% | 3038 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,434 psi | 88% | 2858 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,478 psi | 89% | 2943 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,215 psi | 85% | 3031 fps | 98.2% |
| Somchem S355 | <<locked>> | 86% | 55,521 psi | 87% | 2972 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,883 psi | 88% | 2969 fps | 96.5% |
| Somchem S365 | <<locked>> | 94% | 56,884 psi | 89% | 3058 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,143 psi | 86% | 3009 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 82% | 55,912 psi | 88% | 2887 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,173 psi | 88% | 2904 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,014 psi | 89% | 2946 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,709 psi | 87% | 2995 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,578 psi | 86% | 2986 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 82% | 54,172 psi | 85% | 2894 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,824 psi | 86% | 3002 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,999 psi | 88% | 3068 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 56,623 psi | 89% | 3130 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,535 psi | 87% | 2963 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,392 psi | 90% | 3077 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,400 psi | 77% | 3104 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 55,434 psi | 87% | 3005 fps | 98.2% |
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% | 52,779 psi | 83% | 2841 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,894 psi | 80% | 2861 fps | 98.1% |
| Accurate 3100 | <<locked>> | 86% | 34,664 psi | 54% | 2602 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 50,082 psi | 78% | 2848 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,580 psi | 60% | 2713 fps | 98.3% |
| Accurate MAGPRO | <<locked>> | 96% | 51,503 psi | 81% | 3041 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 47,471 psi | 74% | 2831 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 42,917 psi | 67% | 2818 fps | 95.3% |
| ADI AR 2213 | <<locked>> | 96% | 50,082 psi | 78% | 2989 fps | 95.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,272 psi | 83% | 3061 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 43,105 psi | 68% | 2818 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,138 psi | 75% | 2854 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,517 psi | 81% | 2930 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,652 psi | 59% | 2726 fps | 98.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,844 psi | 67% | 2854 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 42,627 psi | 67% | 2808 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 92% | 42,960 psi | 67% | 2858 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,296 psi | 43% | 2457 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 90% | 33,301 psi | 52% | 2648 fps | 95.4% |
| Alliant Reloder-26 | 71.8 gr | 82% | 31,589 psi | 50% | 2638 fps | 95.5% |
| Bofors RP15 | <<locked>> | 94% | 42,366 psi | 66% | 2844 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 48,544 psi | 76% | 2867 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 42,960 psi | 67% | 2858 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 42,569 psi | 67% | 2736 fps | 96.4% |
| Hodgdon H380 | <<locked>> | 80% | 48,921 psi | 77% | 2881 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 40,741 psi | 64% | 2766 fps | 96.5% |
| Hodgdon H4350 | <<locked>> | 80% | 43,656 psi | 68% | 2789 fps | 95.9% |
| Hodgdon H4831 | <<locked>> | 94% | 50,256 psi | 79% | 2936 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 94% | 49,211 psi | 77% | 2917 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,012 psi | 55% | 2612 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,722 psi | 84% | 2979 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 42,482 psi | 67% | 2930 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 39,639 psi | 62% | 2772 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,253 psi | 43% | 1683 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,937 psi | 78% | 2864 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,330 psi | 82% | 2900 fps | 98.9% |
| IMR 4350 | <<locked>> | 80% | 38,174 psi | 60% | 2654 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,077 psi | 69% | 2769 fps | 97.3% |
| IMR 4831 | <<locked>> | 80% | 36,970 psi | 58% | 2661 fps | 98% |
| IMR 4895 | <<locked>> | 80% | 52,881 psi | 83% | 2959 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 48,675 psi | 76% | 2871 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 96% | 47,805 psi | 75% | 2959 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 50,212 psi | 79% | 2861 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,307 psi | 65% | 2710 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 39,697 psi | 62% | 2690 fps | 96.4% |
| Lovex S071 | <<locked>> | 90% | 33,620 psi | 53% | 2575 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 50,836 psi | 80% | 2913 fps | 100% |
| Norma 204 | <<locked>> | 84% | 43,279 psi | 68% | 2805 fps | 95.3% |
| Norma MRP | 74.8 gr | 88% | 39,392 psi | 62% | 2808 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 38,479 psi | 60% | 2710 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 80% | 51,430 psi | 81% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 47,863 psi | 75% | 2969 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 37,304 psi | 58% | 2694 fps | 96.3% |
| Ramshot Magnum | <<locked>> | 94% | 39,508 psi | 62% | 2766 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,688 psi | 43% | 1722 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,936 psi | 77% | 2864 fps | 98.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,542 psi | 71% | 2913 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,522 psi | 60% | 2730 fps | 98.1% |
| ReloadSwiss RS 70 | 69.4 gr | 80% | 37,275 psi | 58% | 2736 fps | 97.5% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 39,218 psi | 61% | 2841 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 51,895 psi | 81% | 2874 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,687 psi | 72% | 2812 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 47,529 psi | 74% | 2861 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 88% | 41,611 psi | 65% | 2789 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 42,569 psi | 67% | 2736 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,307 psi | 65% | 2710 fps | 97.9% |
| Shooters World Precision | <<locked>> | 80% | 50,212 psi | 79% | 2861 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,697 psi | 62% | 2690 fps | 96.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,065 psi | 74% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,789 psi | 73% | 2713 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,524 psi | 64% | 2654 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 41,234 psi | 65% | 2782 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 45,803 psi | 72% | 2808 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 52,098 psi | 82% | 2907 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 34,838 psi | 55% | 2661 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 39,450 psi | 62% | 2710 fps | 95.4% |
| Vihtavuori N135 | <<locked>> | 80% | 52,330 psi | 82% | 2835 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,707 psi | 83% | 2851 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 43,947 psi | 69% | 2736 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,900 psi | 63% | 2710 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 41,669 psi | 65% | 2749 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 50,879 psi | 80% | 2844 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,262 psi | 62% | 2710 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 80% | 30,313 psi | 48% | 2536 fps | 96.1% |
| Vihtavuori N560 | <<locked>> | 94% | 49,182 psi | 77% | 2999 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,957 psi | 61% | 2677 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 40,741 psi | 64% | 2766 fps | 96.5% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,802 psi | 40% | 2484 fps | 95.7% |
| Winchester Supreme 780 | <<locked>> | 90% | 41,800 psi | 66% | 2759 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 89 powders for .300 Weath. Mag. loaded with the .308 | 166gr | Hammer Stone Hammer. Norma MRP delivers the highest muzzle velocity at 3,143 fps; across all powders the maximum-charge window runs from 1,880 fps to 3,143 fps. Accurate 3100 gives the best case fill at 100 %, and 89 of the 89 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 166.0 gr projectile in 0.308" calls for a 1:12.5 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, ReloadSwiss RS 70 rank at the top here: for .300 Weath. Mag. with the .308 | 166gr | Hammer Stone Hammer 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.