Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 180gr | Sako Hammerhead bullet and 77 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.
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 3100 | <<locked>> | 96% | 56,028 psi | 88% | 2907 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 57,493 psi | 90% | 2943 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 54,389 psi | 85% | 2989 fps | 97% |
| ADI AR 2208 | <<locked>> | 82% | 55,361 psi | 87% | 2854 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 54,476 psi | 85% | 2940 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 96% | 55,854 psi | 88% | 2995 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,789 psi | 73% | 2825 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,669 psi | 65% | 2782 fps | 98.3% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 54,897 psi | 86% | 2936 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,623 psi | 89% | 2877 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,549 psi | 85% | 2946 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,709 psi | 87% | 2959 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,653 psi | 90% | 2986 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,651 psi | 87% | 2992 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,840 psi | 89% | 2969 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,547 psi | 82% | 2972 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 57,464 psi | 90% | 3061 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 54,824 psi | 86% | 2979 fps | 99% |
| Bofors RP3 | <<locked>> | 82% | 57,580 psi | 90% | 2894 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,385 psi | 76% | 2897 fps | 97.4% |
| Bofors RP5 | <<locked>> | 96% | 55,651 psi | 87% | 2992 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 56,623 psi | 89% | 2894 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,561 psi | 81% | 2917 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 82% | 57,551 psi | 90% | 2913 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,506 psi | 87% | 2940 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 54,824 psi | 86% | 2900 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 94% | 56,057 psi | 88% | 2940 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,940 psi | 86% | 2920 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,085 psi | 86% | 2871 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,445 psi | 81% | 3028 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 86% | 55,912 psi | 88% | 2976 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,999 psi | 58% | 1824 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,389 psi | 85% | 2871 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,592 psi | 86% | 2861 fps | 99.6% |
| IMR 4831 | <<locked>> | 88% | 54,317 psi | 85% | 2884 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 57,130 psi | 90% | 2920 fps | 98% |
| IMR 7828 SSC | <<locked>> | 98% | 57,479 psi | 90% | 3035 fps | 98.6% |
| Lovex S065 | <<locked>> | 86% | 55,027 psi | 86% | 2861 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,521 psi | 89% | 2904 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,359 psi | 84% | 2867 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 55,274 psi | 87% | 2927 fps | 98.8% |
| Norma MRP | <<locked>> | 94% | 55,550 psi | 87% | 3018 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 55,811 psi | 87% | 2923 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,346 psi | 85% | 2992 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 88% | 54,708 psi | 86% | 2930 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,507 psi | 89% | 2989 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,724 psi | 59% | 1867 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,305 psi | 90% | 2900 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 55,259 psi | 87% | 2949 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,479 psi | 90% | 2966 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,767 psi | 87% | 2995 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,822 psi | 81% | 3025 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 82% | 54,186 psi | 85% | 2841 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,956 psi | 88% | 2910 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 94% | 57,145 psi | 90% | 2972 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 86% | 56,623 psi | 89% | 2894 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,027 psi | 86% | 2861 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,521 psi | 89% | 2904 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,666 psi | 87% | 2900 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,711 psi | 90% | 2762 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,302 psi | 85% | 2812 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,681 psi | 89% | 2969 fps | 99.2% |
| Somchem S355 | <<locked>> | 84% | 57,464 psi | 90% | 2887 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,537 psi | 90% | 2900 fps | 97.8% |
| Somchem S365 | <<locked>> | 90% | 56,144 psi | 88% | 2930 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,128 psi | 85% | 2890 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 84% | 55,230 psi | 87% | 2808 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,725 psi | 90% | 2917 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 57,116 psi | 90% | 2923 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 88% | 56,884 psi | 89% | 2923 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,521 psi | 87% | 2943 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,419 psi | 87% | 3009 fps | 97.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 55,158 psi | 86% | 2986 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,450 psi | 90% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,724 psi | 87% | 2943 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 53,969 psi | 85% | 3048 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 53,998 psi | 85% | 2884 fps | 98.8% |
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% | 32,590 psi | 51% | 2454 fps | 95.8% |
| Accurate 4350 | <<locked>> | 80% | 43,830 psi | 69% | 2717 fps | 99.7% |
| Accurate MAGPRO | 79.4 gr | 90% | 47,253 psi | 74% | 2861 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 52,054 psi | 82% | 2805 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 39,204 psi | 61% | 2641 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 90% | 45,643 psi | 72% | 2808 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 98% | 43,859 psi | 69% | 2766 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 94% | 34,243 psi | 54% | 2592 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 39,581 psi | 62% | 2644 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,069 psi | 83% | 2825 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,105 psi | 66% | 2726 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,327 psi | 76% | 2844 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,204 psi | 61% | 2638 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 86% | 39,900 psi | 63% | 2694 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,343 psi | 49% | 2487 fps | 98.8% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,082 psi | 49% | 2497 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,953 psi | 53% | 2612 fps | 97.8% |
| Bofors RP15 | <<locked>> | 88% | 39,392 psi | 62% | 2680 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 53,925 psi | 85% | 2841 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 42,279 psi | 66% | 2776 fps | 95.7% |
| Bofors RP5 | <<locked>> | 86% | 39,900 psi | 63% | 2694 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 46,891 psi | 73% | 2723 fps | 98.4% |
| Hodgdon H1000 | <<locked>> | 94% | 42,047 psi | 66% | 2730 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 53,911 psi | 84% | 2858 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,484 psi | 71% | 2766 fps | 98.6% |
| Hodgdon H4350 | <<locked>> | 80% | 48,138 psi | 75% | 2782 fps | 98% |
| Hodgdon H4831 | <<locked>> | 88% | 45,658 psi | 72% | 2756 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 47,921 psi | 75% | 2799 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,595 psi | 62% | 2612 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 90% | 36,927 psi | 58% | 2697 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 44,817 psi | 70% | 2785 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,702 psi | 43% | 1631 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,264 psi | 66% | 2651 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,196 psi | 76% | 2749 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 41,858 psi | 66% | 2667 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 44,483 psi | 70% | 2697 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 90% | 43,816 psi | 69% | 2782 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 45,876 psi | 72% | 2700 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 44,135 psi | 69% | 2687 fps | 98.4% |
| Lovex S071 | <<locked>> | 84% | 31,923 psi | 50% | 2438 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 42,250 psi | 66% | 2687 fps | 96.1% |
| Norma MRP | 71 gr | 82% | 36,332 psi | 57% | 2638 fps | 96% |
| Norma URP | <<locked>> | 80% | 43,134 psi | 68% | 2707 fps | 99.6% |
| Ramshot Grand | <<locked>> | 90% | 43,685 psi | 68% | 2792 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 42,018 psi | 66% | 2700 fps | 98.5% |
| Ramshot Magnum | <<locked>> | 88% | 36,318 psi | 57% | 2605 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,239 psi | 44% | 1670 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,766 psi | 84% | 2844 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,285 psi | 80% | 2890 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,743 psi | 69% | 2736 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,930 psi | 66% | 2749 fps | 99.4% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 36,245 psi | 57% | 2677 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 80% | 50,879 psi | 80% | 2789 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 43,265 psi | 68% | 2680 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 82% | 38,319 psi | 60% | 2618 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 46,891 psi | 73% | 2723 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,876 psi | 72% | 2700 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 44,135 psi | 69% | 2687 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,185 psi | 82% | 2844 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,126 psi | 80% | 2674 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,730 psi | 70% | 2648 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 37,985 psi | 60% | 2615 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 50,821 psi | 80% | 2785 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 47,166 psi | 74% | 2726 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 39,871 psi | 62% | 2661 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,492 psi | 57% | 2546 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 48,573 psi | 76% | 2710 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,512 psi | 70% | 2703 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 38,580 psi | 60% | 2589 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 43,845 psi | 69% | 2703 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 35,070 psi | 55% | 2559 fps | 98.7% |
| Vihtavuori N560 | 76.2 gr | 88% | 45,063 psi | 71% | 2818 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 94% | 44,802 psi | 70% | 2799 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,642 psi | 68% | 2667 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,629 psi | 72% | 2769 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,775 psi | 44% | 2480 fps | 98.6% |
| Winchester Supreme 780 | <<locked>> | 84% | 38,174 psi | 60% | 2585 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 77 powders for .300 Weath. Mag. loaded with the .308 | 180gr | Sako Hammerhead. Alliant Reloder-26 delivers the highest muzzle velocity at 3,061 fps; across all powders the maximum-charge window runs from 1,824 fps to 3,061 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 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 1:15.0 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 Hammerhead 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.