Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 190gr | Speer Boat Tail Hollow Point bullet and 75 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% | 55,898 psi | 88% | 2828 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 57,493 psi | 90% | 2864 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 54,302 psi | 85% | 2917 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 82% | 55,245 psi | 87% | 2772 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 54,534 psi | 85% | 2861 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 96% | 55,811 psi | 87% | 2920 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,717 psi | 73% | 2753 fps | 96.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,510 psi | 65% | 2713 fps | 98.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,594 psi | 89% | 2795 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,665 psi | 86% | 2864 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,753 psi | 87% | 2877 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,667 psi | 90% | 2904 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,622 psi | 87% | 2917 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,739 psi | 89% | 2887 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,402 psi | 82% | 2894 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 57,232 psi | 90% | 2979 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 54,563 psi | 86% | 2897 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,356 psi | 76% | 2825 fps | 97.7% |
| Bofors RP5 | <<locked>> | 96% | 55,622 psi | 87% | 2917 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 56,637 psi | 89% | 2812 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,605 psi | 81% | 2844 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 86% | 55,521 psi | 87% | 2861 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 54,897 psi | 86% | 2822 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 94% | 55,912 psi | 88% | 2861 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,766 psi | 86% | 2841 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,042 psi | 86% | 2792 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,227 psi | 80% | 2949 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 86% | 55,956 psi | 88% | 2900 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,057 psi | 58% | 1765 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,404 psi | 85% | 2795 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,505 psi | 85% | 2782 fps | 99.7% |
| IMR 4831 | <<locked>> | 90% | 57,711 psi | 90% | 2851 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 57,087 psi | 89% | 2844 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 98% | 57,319 psi | 90% | 2953 fps | 98.8% |
| Lovex S065 | <<locked>> | 86% | 55,013 psi | 86% | 2782 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,710 psi | 89% | 2828 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,403 psi | 84% | 2792 fps | 100% |
| Norma 204 | <<locked>> | 88% | 55,288 psi | 87% | 2848 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 37,101 psi | 58% | 2635 fps | 96.5% |
| Norma MRP | <<locked>> | 94% | 55,579 psi | 87% | 2940 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 55,999 psi | 88% | 2848 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,259 psi | 85% | 2917 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 54,723 psi | 86% | 2851 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,347 psi | 88% | 2910 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,811 psi | 59% | 1804 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,377 psi | 90% | 2822 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 55,172 psi | 86% | 2864 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,551 psi | 90% | 2887 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,753 psi | 87% | 2917 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,590 psi | 81% | 2946 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 82% | 54,186 psi | 85% | 2762 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,956 psi | 88% | 2831 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 94% | 57,072 psi | 89% | 2894 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 86% | 56,637 psi | 89% | 2812 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 55,013 psi | 86% | 2782 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,710 psi | 89% | 2828 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,709 psi | 87% | 2818 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,418 psi | 85% | 2641 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,433 psi | 85% | 2736 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,623 psi | 89% | 2887 fps | 99.4% |
| Somchem S355 | <<locked>> | 84% | 57,522 psi | 90% | 2805 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,551 psi | 90% | 2828 fps | 98.1% |
| Somchem S365 | <<locked>> | 90% | 56,028 psi | 88% | 2848 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,653 psi | 90% | 2867 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 55,158 psi | 86% | 2730 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,143 psi | 85% | 2785 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 57,130 psi | 90% | 2848 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 88% | 56,855 psi | 89% | 2844 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,405 psi | 87% | 2864 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,492 psi | 87% | 2933 fps | 98.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,810 psi | 86% | 2907 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,464 psi | 90% | 2799 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,753 psi | 87% | 2864 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 53,693 psi | 84% | 2966 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,653 psi | 90% | 2864 fps | 99.4% |
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% | 32,561 psi | 51% | 2392 fps | 96.3% |
| Accurate 4350 | <<locked>> | 80% | 43,801 psi | 69% | 2644 fps | 99.9% |
| Accurate MAGPRO | 76.2 gr | 90% | 47,152 psi | 74% | 2789 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 52,025 psi | 82% | 2723 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 39,233 psi | 61% | 2575 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 88% | 42,757 psi | 67% | 2677 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 96% | 41,017 psi | 64% | 2635 fps | 95% |
| ADI AR 2225 | <<locked>> | 94% | 34,243 psi | 54% | 2533 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 53,127 psi | 83% | 2746 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,119 psi | 66% | 2654 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,515 psi | 76% | 2769 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,102 psi | 61% | 2569 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 84% | 37,304 psi | 58% | 2569 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,372 psi | 49% | 2425 fps | 99.1% |
| Alliant Reloder-25 | <<locked>> | 82% | 29,240 psi | 46% | 2379 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,910 psi | 53% | 2546 fps | 98.2% |
| Bofors RP15 | <<locked>> | 86% | 36,956 psi | 58% | 2559 fps | 95% |
| Bofors RP30 | <<locked>> | 94% | 39,421 psi | 62% | 2648 fps | 95.2% |
| Bofors RP5 | <<locked>> | 84% | 37,304 psi | 58% | 2569 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 46,949 psi | 74% | 2651 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 92% | 39,233 psi | 61% | 2598 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 45,527 psi | 71% | 2694 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 80% | 48,124 psi | 75% | 2707 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 88% | 45,600 psi | 71% | 2684 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 44,860 psi | 70% | 2671 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,769 psi | 62% | 2543 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 36,927 psi | 58% | 2635 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 44,904 psi | 70% | 2713 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,717 psi | 43% | 1575 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,366 psi | 66% | 2582 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,283 psi | 76% | 2677 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 41,785 psi | 65% | 2595 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 44,541 psi | 70% | 2628 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 90% | 43,787 psi | 69% | 2713 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 45,905 psi | 72% | 2628 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 44,208 psi | 69% | 2618 fps | 98.7% |
| Lovex S071 | <<locked>> | 82% | 30,008 psi | 47% | 2323 fps | 95.2% |
| Norma 204 | <<locked>> | 80% | 42,134 psi | 66% | 2615 fps | 96.5% |
| Norma 217 | <<locked>> | 98% | 34,693 psi | 54% | 2575 fps | 95.5% |
| Norma MRP | 66.5 gr | 80% | 33,910 psi | 53% | 2513 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 43,250 psi | 68% | 2635 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 40,741 psi | 64% | 2661 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 41,901 psi | 66% | 2628 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 88% | 36,230 psi | 57% | 2539 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,282 psi | 44% | 1611 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,693 psi | 84% | 2766 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,488 psi | 81% | 2815 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,729 psi | 69% | 2664 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,989 psi | 66% | 2677 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 33,823 psi | 53% | 2549 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 50,981 psi | 80% | 2713 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 40,625 psi | 64% | 2556 fps | 95% |
| Rottweil R 905 | <<locked>> | 82% | 38,348 psi | 60% | 2552 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 46,949 psi | 74% | 2651 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,905 psi | 72% | 2628 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 44,208 psi | 69% | 2618 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,054 psi | 82% | 2766 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,198 psi | 80% | 2598 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,860 psi | 70% | 2575 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,014 psi | 60% | 2546 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 50,850 psi | 80% | 2710 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 44,193 psi | 69% | 2602 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 40,001 psi | 63% | 2592 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,477 psi | 57% | 2484 fps | 96% |
| Vihtavuori N150 | <<locked>> | 80% | 48,660 psi | 76% | 2635 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,498 psi | 70% | 2628 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 36,027 psi | 56% | 2467 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 43,888 psi | 69% | 2631 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 35,114 psi | 55% | 2497 fps | 99% |
| Vihtavuori N560 | 73.2 gr | 88% | 45,107 psi | 71% | 2749 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 92% | 41,872 psi | 66% | 2671 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,555 psi | 68% | 2595 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,730 psi | 72% | 2694 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,731 psi | 43% | 2421 fps | 99% |
| Winchester Supreme 780 | <<locked>> | 84% | 38,276 psi | 60% | 2523 fps | 95.5% |
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 82 powders for .300 Weath. Mag. loaded with the .308 | 190gr | Speer Boat Tail Hollow Point. Alliant Reloder-26 delivers the highest muzzle velocity at 2,979 fps; across all powders the maximum-charge window runs from 1,765 fps to 2,979 fps. ADI AR 2217 gives the best case fill at 100 %, and 82 of the 82 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 190.0 gr projectile in 0.308" calls for a 1:12.0 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 | 190gr | Speer Boat Tail Hollow Point they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 7977 Enduron, IMR 8133 Enduron, Vihtavuori N170 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.