Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 180gr | Speer RN bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Ramshot Grand, Accurate MAGPRO and Alliant Reloder-26.
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% | 56,797 psi | 89% | 2920 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,520 psi | 85% | 2900 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 55,288 psi | 87% | 3009 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 82% | 55,767 psi | 87% | 2864 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 55,259 psi | 87% | 2953 fps | 99% |
| ADI AR 2213 | <<locked>> | 96% | 56,782 psi | 89% | 3015 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,384 psi | 74% | 2838 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,177 psi | 66% | 2795 fps | 98.4% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 55,405 psi | 87% | 2949 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 57,087 psi | 89% | 2887 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 55,216 psi | 87% | 2956 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 56,579 psi | 89% | 2976 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 54,708 psi | 86% | 2940 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 96% | 56,608 psi | 89% | 3009 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 98% | 57,653 psi | 90% | 2982 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,214 psi | 83% | 2986 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,070 psi | 85% | 3012 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 55,550 psi | 87% | 2989 fps | 99.1% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,095 psi | 77% | 2910 fps | 97.6% |
| Bofors RP5 | <<locked>> | 96% | 56,608 psi | 89% | 3009 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 57,217 psi | 90% | 2904 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,344 psi | 82% | 2933 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 86% | 56,289 psi | 88% | 2956 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 55,419 psi | 87% | 2910 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 94% | 56,768 psi | 89% | 2953 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,651 psi | 87% | 2936 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,695 psi | 87% | 2881 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,127 psi | 82% | 3045 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 86% | 56,623 psi | 89% | 2992 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,014 psi | 58% | 1831 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 55,143 psi | 86% | 2887 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 84% | 55,114 psi | 86% | 2874 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 54,911 psi | 86% | 2894 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,230 psi | 85% | 2877 fps | 97.5% |
| IMR 7828 SSC | <<locked>> | 96% | 54,331 psi | 85% | 2986 fps | 98.1% |
| Lovex S065 | <<locked>> | 86% | 55,622 psi | 87% | 2871 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 57,305 psi | 90% | 2920 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,128 psi | 85% | 2881 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 56,043 psi | 88% | 2940 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 37,797 psi | 59% | 2717 fps | 96.4% |
| Norma MRP | <<locked>> | 94% | 56,304 psi | 88% | 3028 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 56,637 psi | 89% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 55,114 psi | 86% | 3009 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 88% | 55,463 psi | 87% | 2943 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 57,464 psi | 90% | 3005 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,724 psi | 59% | 1870 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 55,999 psi | 88% | 2959 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,346 psi | 85% | 2920 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 56,565 psi | 89% | 3009 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 52,649 psi | 83% | 3041 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 82% | 54,868 psi | 86% | 2851 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 56,478 psi | 89% | 2920 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 92% | 54,172 psi | 85% | 2930 fps | 99% |
| Rottweil R 907 | <<locked>> | 86% | 57,217 psi | 90% | 2904 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,622 psi | 87% | 2871 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 57,305 psi | 90% | 2920 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 56,304 psi | 88% | 2910 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,868 psi | 86% | 2730 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,839 psi | 86% | 2822 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 57,435 psi | 90% | 2982 fps | 99.3% |
| Somchem S355 | <<locked>> | 82% | 54,462 psi | 85% | 2844 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,578 psi | 86% | 2861 fps | 97.4% |
| Somchem S365 | <<locked>> | 90% | 56,768 psi | 89% | 2940 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,882 psi | 86% | 2904 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 84% | 55,637 psi | 87% | 2818 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,824 psi | 86% | 2877 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,302 psi | 85% | 2884 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 88% | 57,682 psi | 90% | 2936 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 56,376 psi | 88% | 2959 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,202 psi | 88% | 3025 fps | 98% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 55,840 psi | 88% | 2999 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,288 psi | 85% | 2838 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,289 psi | 88% | 2956 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 54,882 psi | 86% | 3058 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,694 psi | 86% | 2897 fps | 98.9% |
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% | 33,098 psi | 52% | 2470 fps | 96.1% |
| Accurate 4350 | <<locked>> | 80% | 44,527 psi | 70% | 2733 fps | 99.8% |
| Accurate MAGPRO | 80.3 gr | 90% | 47,950 psi | 75% | 2877 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 52,460 psi | 82% | 2812 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 39,726 psi | 62% | 2657 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 88% | 43,294 psi | 68% | 2762 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 98% | 44,411 psi | 70% | 2779 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 94% | 34,708 psi | 54% | 2605 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 39,943 psi | 63% | 2654 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,708 psi | 84% | 2838 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,540 psi | 67% | 2736 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,994 psi | 77% | 2858 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,581 psi | 62% | 2648 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 84% | 37,768 psi | 59% | 2644 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,720 psi | 50% | 2497 fps | 98.9% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,517 psi | 49% | 2510 fps | 96% |
| Alliant Reloder-26 | 72.2 gr | 80% | 34,505 psi | 54% | 2628 fps | 98% |
| Bofors RP15 | <<locked>> | 88% | 40,059 psi | 63% | 2697 fps | 95.7% |
| Bofors RP30 | <<locked>> | 96% | 42,917 psi | 67% | 2789 fps | 95.9% |
| Bofors RP5 | <<locked>> | 84% | 37,768 psi | 59% | 2644 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 47,282 psi | 74% | 2736 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 94% | 42,627 psi | 67% | 2743 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 46,050 psi | 72% | 2776 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 80% | 48,733 psi | 76% | 2795 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 88% | 46,369 psi | 73% | 2772 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 88% | 45,426 psi | 71% | 2753 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,205 psi | 63% | 2625 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 37,478 psi | 59% | 2717 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 45,339 psi | 71% | 2795 fps | 98.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,644 psi | 43% | 1634 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,830 psi | 67% | 2664 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,573 psi | 76% | 2759 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 42,279 psi | 66% | 2677 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 44,962 psi | 70% | 2710 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 90% | 44,469 psi | 70% | 2799 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 46,238 psi | 72% | 2713 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 44,527 psi | 70% | 2697 fps | 98.5% |
| Lovex S071 | <<locked>> | 84% | 32,430 psi | 51% | 2451 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 42,627 psi | 67% | 2697 fps | 96.3% |
| Norma 217 | <<locked>> | 98% | 35,302 psi | 55% | 2651 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 34,418 psi | 54% | 2589 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 43,598 psi | 68% | 2717 fps | 99.7% |
| Ramshot Grand | 76.4 gr | 88% | 41,191 psi | 65% | 2743 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 42,366 psi | 66% | 2707 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 88% | 36,869 psi | 58% | 2618 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,355 psi | 44% | 1677 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 52,025 psi | 82% | 2904 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,353 psi | 70% | 2749 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,467 psi | 67% | 2762 fps | 99.5% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 34,272 psi | 54% | 2625 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 51,329 psi | 80% | 2799 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 43,801 psi | 69% | 2694 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 82% | 38,885 psi | 61% | 2631 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 47,282 psi | 74% | 2736 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,238 psi | 72% | 2713 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 44,527 psi | 70% | 2697 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,620 psi | 82% | 2854 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,561 psi | 81% | 2684 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,237 psi | 71% | 2657 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,551 psi | 60% | 2628 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 51,256 psi | 80% | 2795 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 44,701 psi | 70% | 2680 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 40,538 psi | 64% | 2677 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,985 psi | 58% | 2559 fps | 95.8% |
| Vihtavuori N150 | <<locked>> | 80% | 49,008 psi | 77% | 2720 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,136 psi | 71% | 2717 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 36,521 psi | 57% | 2546 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 44,411 psi | 70% | 2717 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 35,520 psi | 56% | 2572 fps | 98.9% |
| Vihtavuori N560 | <<locked>> | 88% | 45,745 psi | 72% | 2835 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 94% | 45,498 psi | 71% | 2815 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,150 psi | 69% | 2677 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,253 psi | 72% | 2779 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 28,108 psi | 44% | 2493 fps | 98.8% |
| Winchester Supreme 780 | <<locked>> | 84% | 38,653 psi | 61% | 2598 fps | 95.2% |
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 75 powders for .300 Weath. Mag. loaded with the .308 | 180gr | Speer RN. Winchester StaBALL HD delivers the highest muzzle velocity at 3,058 fps; across all powders the maximum-charge window runs from 1,831 fps to 3,058 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 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 1:16.0 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. Ramshot Grand, Accurate MAGPRO, Alliant Reloder-26 rank at the top here: for .300 Weath. Mag. with the .308 | 180gr | Speer RN 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.