Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 180gr | Sako SuperHammerhead 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% | 55,187 psi | 86% | 2894 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 57,000 psi | 89% | 2936 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 57,653 psi | 90% | 3041 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 82% | 54,882 psi | 86% | 2844 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,696 psi | 90% | 2986 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 96% | 55,332 psi | 87% | 2986 fps | 98.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,180 psi | 72% | 2808 fps | 96.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,089 psi | 64% | 2766 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,898 psi | 88% | 2867 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,696 psi | 90% | 2989 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,201 psi | 87% | 2953 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,101 psi | 89% | 2972 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,056 psi | 86% | 2982 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,941 psi | 88% | 2956 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,779 psi | 81% | 2956 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,550 psi | 89% | 3048 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 3018 fps | 99.2% |
| Bofors RP3 | <<locked>> | 82% | 57,101 psi | 89% | 2884 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,645 psi | 75% | 2881 fps | 97.2% |
| Bofors RP5 | <<locked>> | 96% | 55,056 psi | 86% | 2982 fps | 99% |
| Bofors RP7 | <<locked>> | 86% | 55,956 psi | 88% | 2877 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,894 psi | 80% | 2900 fps | 98% |
| Hodgdon H380 | <<locked>> | 82% | 57,116 psi | 90% | 2904 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,056 psi | 86% | 2930 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 84% | 54,186 psi | 85% | 2884 fps | 99% |
| Hodgdon H4831 | <<locked>> | 94% | 55,259 psi | 87% | 2923 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,143 psi | 85% | 2907 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,360 psi | 85% | 2858 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,705 psi | 79% | 3012 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 86% | 55,288 psi | 87% | 2966 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,956 psi | 58% | 1821 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,377 psi | 90% | 2917 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,537 psi | 90% | 2904 fps | 99.8% |
| IMR 4831 | <<locked>> | 90% | 57,101 psi | 89% | 2923 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,608 psi | 89% | 2910 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 98% | 56,681 psi | 89% | 3018 fps | 98.4% |
| Lovex S065 | <<locked>> | 86% | 54,592 psi | 86% | 2848 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,144 psi | 88% | 2897 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,765 psi | 83% | 2858 fps | 99.8% |
| Norma 204 | <<locked>> | 88% | 54,665 psi | 86% | 2913 fps | 98.7% |
| Norma MRP | <<locked>> | 94% | 54,708 psi | 86% | 3002 fps | 99.7% |
| Norma URP | <<locked>> | 88% | 55,361 psi | 87% | 2917 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,609 psi | 90% | 3041 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 54,099 psi | 85% | 2917 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,782 psi | 87% | 2976 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,681 psi | 59% | 1860 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,681 psi | 89% | 2887 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,491 psi | 85% | 2936 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,797 psi | 89% | 2956 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,129 psi | 86% | 2986 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,155 psi | 80% | 3012 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 84% | 57,188 psi | 90% | 2881 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,376 psi | 87% | 2897 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 94% | 56,478 psi | 89% | 2959 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 86% | 55,956 psi | 88% | 2877 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,592 psi | 86% | 2848 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,144 psi | 88% | 2897 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,027 psi | 86% | 2887 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,217 psi | 90% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,406 psi | 90% | 2854 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,057 psi | 88% | 2956 fps | 99.1% |
| Somchem S355 | <<locked>> | 84% | 56,942 psi | 89% | 2877 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,058 psi | 89% | 2894 fps | 97.7% |
| Somchem S365 | <<locked>> | 90% | 55,419 psi | 87% | 2917 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,000 psi | 89% | 2933 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 84% | 54,578 psi | 86% | 2799 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,261 psi | 90% | 2910 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,565 psi | 89% | 2910 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 88% | 56,246 psi | 88% | 2913 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,868 psi | 86% | 2933 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,650 psi | 86% | 2992 fps | 97.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,172 psi | 85% | 2966 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,855 psi | 89% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,056 psi | 86% | 2930 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 57,174 psi | 90% | 3094 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,087 psi | 89% | 2930 fps | 99.1% |
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% | 32,184 psi | 50% | 2444 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 43,337 psi | 68% | 2707 fps | 99.7% |
| Accurate MAGPRO | 78.6 gr | 90% | 46,673 psi | 73% | 2851 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 51,561 psi | 81% | 2792 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 38,798 psi | 61% | 2631 fps | 95% |
| ADI AR 2213 | <<locked>> | 90% | 45,121 psi | 71% | 2795 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 98% | 43,236 psi | 68% | 2749 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 96% | 36,158 psi | 57% | 2641 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,547 psi | 82% | 2815 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,611 psi | 65% | 2713 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,819 psi | 75% | 2835 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 38,638 psi | 61% | 2621 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 86% | 39,320 psi | 62% | 2680 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,922 psi | 48% | 2474 fps | 98.6% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,748 psi | 48% | 2484 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,431 psi | 52% | 2595 fps | 97.5% |
| Bofors RP15 | <<locked>> | 88% | 38,986 psi | 61% | 2671 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 53,359 psi | 84% | 2831 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 41,568 psi | 65% | 2759 fps | 95.4% |
| Bofors RP5 | <<locked>> | 86% | 39,320 psi | 62% | 2680 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 46,441 psi | 73% | 2713 fps | 98.2% |
| Hodgdon H1000 | <<locked>> | 94% | 41,423 psi | 65% | 2713 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 53,417 psi | 84% | 2848 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,991 psi | 71% | 2753 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 80% | 47,674 psi | 75% | 2769 fps | 97.9% |
| Hodgdon H4831 | <<locked>> | 90% | 48,341 psi | 76% | 2805 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 90% | 47,369 psi | 74% | 2785 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,276 psi | 62% | 2602 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 38,972 psi | 61% | 2749 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 44,208 psi | 69% | 2769 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,557 psi | 43% | 1624 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,843 psi | 66% | 2641 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,747 psi | 75% | 2740 fps | 98.8% |
| IMR 4831 | <<locked>> | 80% | 41,379 psi | 65% | 2654 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 88% | 46,905 psi | 74% | 2743 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 90% | 43,279 psi | 68% | 2769 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 45,411 psi | 71% | 2690 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 43,700 psi | 68% | 2677 fps | 98.3% |
| Lovex S071 | <<locked>> | 84% | 31,502 psi | 49% | 2425 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 41,669 psi | 65% | 2671 fps | 95.9% |
| Norma MRP | 70.3 gr | 82% | 35,926 psi | 56% | 2625 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 42,656 psi | 67% | 2697 fps | 99.6% |
| Ramshot Grand | <<locked>> | 90% | 43,178 psi | 68% | 2779 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 41,379 psi | 65% | 2684 fps | 98.3% |
| Ramshot Magnum | <<locked>> | 90% | 38,450 psi | 60% | 2654 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,268 psi | 44% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,127 psi | 83% | 2835 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,720 psi | 79% | 2881 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,120 psi | 68% | 2723 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,495 psi | 65% | 2736 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 35,723 psi | 56% | 2661 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 50,357 psi | 79% | 2779 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 42,859 psi | 67% | 2671 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 82% | 37,913 psi | 59% | 2608 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 46,441 psi | 73% | 2713 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,411 psi | 71% | 2690 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 80% | 43,700 psi | 68% | 2677 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,517 psi | 81% | 2835 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,633 psi | 79% | 2664 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,309 psi | 69% | 2635 fps | 98.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 40,306 psi | 63% | 2664 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 50,299 psi | 79% | 2776 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 46,688 psi | 73% | 2713 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 39,349 psi | 62% | 2651 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,056 psi | 56% | 2536 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 48,095 psi | 75% | 2700 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,048 psi | 69% | 2694 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 38,043 psi | 60% | 2575 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 43,424 psi | 68% | 2694 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 34,592 psi | 54% | 2549 fps | 98.6% |
| Vihtavuori N560 | 75.4 gr | 88% | 44,512 psi | 70% | 2805 fps | 95% |
| Vihtavuori N565 | <<locked>> | 94% | 44,266 psi | 69% | 2785 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,076 psi | 68% | 2657 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,194 psi | 71% | 2756 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,369 psi | 43% | 2464 fps | 98.3% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,379 psi | 63% | 2631 fps | 95.7% |
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 | 180gr | Sako SuperHammerhead. Winchester StaBALL HD delivers the highest muzzle velocity at 3,094 fps; across all powders the maximum-charge window runs from 1,821 fps to 3,094 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 180.0 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 | 180gr | Sako SuperHammerhead 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.