Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 181gr | RWS H-Mantel bullet and 76 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Accurate MAGPRO.
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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 55,361 psi | 87% | 2887 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 56,898 psi | 89% | 2923 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 57,624 psi | 90% | 3035 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 82% | 54,897 psi | 86% | 2838 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,595 psi | 90% | 2979 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 96% | 55,230 psi | 87% | 2976 fps | 98.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,340 psi | 73% | 2805 fps | 96.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,060 psi | 64% | 2759 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,956 psi | 88% | 2858 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,186 psi | 85% | 2930 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,114 psi | 86% | 2943 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,014 psi | 89% | 2963 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,013 psi | 86% | 2972 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,130 psi | 88% | 2953 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,735 psi | 81% | 2949 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,550 psi | 89% | 3041 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 53,983 psi | 85% | 2956 fps | 98.8% |
| Bofors RP3 | <<locked>> | 82% | 57,188 psi | 90% | 2877 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,790 psi | 75% | 2877 fps | 97.2% |
| Bofors RP5 | <<locked>> | 96% | 55,013 psi | 86% | 2972 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 56,072 psi | 88% | 2871 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,039 psi | 80% | 2897 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 82% | 57,174 psi | 90% | 2897 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,984 psi | 86% | 2923 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 84% | 54,302 psi | 85% | 2881 fps | 99% |
| Hodgdon H4831 | <<locked>> | 94% | 55,434 psi | 87% | 2917 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,317 psi | 85% | 2900 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,505 psi | 85% | 2851 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,705 psi | 79% | 3005 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 86% | 55,245 psi | 87% | 2956 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,941 psi | 58% | 1814 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,537 psi | 90% | 2910 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,638 psi | 90% | 2897 fps | 99.8% |
| IMR 4831 | <<locked>> | 90% | 57,232 psi | 90% | 2917 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,507 psi | 89% | 2904 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 98% | 56,898 psi | 89% | 3015 fps | 98.4% |
| Lovex S065 | <<locked>> | 86% | 54,665 psi | 86% | 2841 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,231 psi | 88% | 2890 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,692 psi | 83% | 2848 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 54,810 psi | 86% | 2907 fps | 98.7% |
| Norma MRP | <<locked>> | 94% | 54,853 psi | 86% | 2995 fps | 99.7% |
| Norma URP | <<locked>> | 88% | 55,463 psi | 87% | 2910 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,609 psi | 90% | 3035 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 54,201 psi | 85% | 2910 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,753 psi | 87% | 2969 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,666 psi | 59% | 1857 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,797 psi | 89% | 2884 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,578 psi | 86% | 2930 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,927 psi | 89% | 2949 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,042 psi | 86% | 2972 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,213 psi | 80% | 3002 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 84% | 57,261 psi | 90% | 2874 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,317 psi | 87% | 2890 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 94% | 56,681 psi | 89% | 2956 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 86% | 56,072 psi | 88% | 2871 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,665 psi | 86% | 2841 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,231 psi | 88% | 2890 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,114 psi | 86% | 2881 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,305 psi | 90% | 2749 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,508 psi | 90% | 2848 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,217 psi | 88% | 2953 fps | 99.2% |
| Somchem S355 | <<locked>> | 84% | 57,043 psi | 89% | 2871 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,000 psi | 89% | 2884 fps | 97.7% |
| Somchem S365 | <<locked>> | 90% | 55,550 psi | 87% | 2910 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,159 psi | 90% | 2927 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 84% | 54,650 psi | 86% | 2792 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,188 psi | 90% | 2900 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,536 psi | 89% | 2904 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 88% | 56,405 psi | 88% | 2907 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,781 psi | 86% | 2923 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,824 psi | 86% | 2989 fps | 97.7% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,433 psi | 85% | 2963 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,811 psi | 89% | 2861 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,143 psi | 86% | 2923 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 57,217 psi | 90% | 3084 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,261 psi | 90% | 2923 fps | 99.2% |
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 3100 | <<locked>> | 80% | 32,242 psi | 51% | 2438 fps | 95.7% |
| Accurate 4350 | <<locked>> | 80% | 43,410 psi | 68% | 2700 fps | 99.7% |
| Accurate MAGPRO | 78.3 gr | 90% | 46,644 psi | 73% | 2841 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 51,605 psi | 81% | 2785 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 38,870 psi | 61% | 2625 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 90% | 45,252 psi | 71% | 2789 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 98% | 43,192 psi | 68% | 2740 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 94% | 33,968 psi | 53% | 2575 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,605 psi | 82% | 2808 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,669 psi | 65% | 2707 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,921 psi | 75% | 2831 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 38,696 psi | 61% | 2618 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 86% | 39,407 psi | 62% | 2674 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,980 psi | 49% | 2467 fps | 98.7% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,821 psi | 48% | 2480 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,518 psi | 53% | 2592 fps | 97.6% |
| Bofors RP15 | <<locked>> | 88% | 39,073 psi | 61% | 2667 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 53,447 psi | 84% | 2825 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 41,698 psi | 65% | 2756 fps | 95.5% |
| Bofors RP5 | <<locked>> | 86% | 39,407 psi | 62% | 2674 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 46,499 psi | 73% | 2707 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 94% | 41,539 psi | 65% | 2710 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 53,505 psi | 84% | 2841 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,078 psi | 71% | 2746 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 80% | 47,747 psi | 75% | 2762 fps | 97.9% |
| Hodgdon H4831 | <<locked>> | 88% | 45,237 psi | 71% | 2736 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 90% | 47,471 psi | 74% | 2782 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,334 psi | 62% | 2595 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 38,943 psi | 61% | 2746 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 44,309 psi | 69% | 2766 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,688 psi | 43% | 1621 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,901 psi | 66% | 2635 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,805 psi | 75% | 2733 fps | 98.8% |
| IMR 4831 | <<locked>> | 80% | 41,452 psi | 65% | 2648 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 88% | 46,833 psi | 73% | 2733 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 90% | 43,366 psi | 68% | 2766 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 45,469 psi | 71% | 2684 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 43,758 psi | 69% | 2671 fps | 98.3% |
| Lovex S071 | <<locked>> | 84% | 31,560 psi | 49% | 2418 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 41,698 psi | 65% | 2667 fps | 95.9% |
| Norma MRP | 70 gr | 82% | 35,882 psi | 56% | 2621 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 42,714 psi | 67% | 2690 fps | 99.6% |
| Ramshot Grand | <<locked>> | 90% | 43,120 psi | 68% | 2772 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 41,466 psi | 65% | 2677 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 88% | 35,795 psi | 56% | 2582 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,224 psi | 44% | 1660 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,229 psi | 83% | 2828 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,836 psi | 80% | 2874 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,163 psi | 68% | 2717 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,597 psi | 65% | 2733 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 35,810 psi | 56% | 2657 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 50,415 psi | 79% | 2772 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 42,946 psi | 67% | 2664 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 82% | 37,956 psi | 59% | 2602 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 46,499 psi | 73% | 2707 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,469 psi | 71% | 2684 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 80% | 43,758 psi | 69% | 2671 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,561 psi | 81% | 2825 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,676 psi | 79% | 2657 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,338 psi | 69% | 2628 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 40,205 psi | 63% | 2654 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 50,357 psi | 79% | 2769 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 46,775 psi | 73% | 2710 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 39,421 psi | 62% | 2644 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,129 psi | 57% | 2530 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 48,167 psi | 75% | 2694 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,121 psi | 69% | 2687 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 38,116 psi | 60% | 2572 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 43,482 psi | 68% | 2687 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 34,650 psi | 54% | 2543 fps | 98.6% |
| Vihtavuori N560 | 75.2 gr | 88% | 44,614 psi | 70% | 2799 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 94% | 44,222 psi | 69% | 2779 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,149 psi | 68% | 2651 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,252 psi | 71% | 2749 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,398 psi | 43% | 2461 fps | 98.4% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,480 psi | 63% | 2628 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 76 powders for .300 Weath. Mag. loaded with the .308 | 181gr | RWS H-Mantel. Winchester StaBALL HD delivers the highest muzzle velocity at 3,084 fps; across all powders the maximum-charge window runs from 1,814 fps to 3,084 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 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 181.0 gr projectile in 0.308" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, 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. Norma MRP, Vihtavuori N560, Accurate MAGPRO rank at the top here: for .300 Weath. Mag. with the .308 | 181gr | RWS H-Mantel 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.