Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 180gr | Speer Hot-Cor 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 ADI AR 2213.
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% | 55,869 psi | 88% | 2904 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 57,319 psi | 90% | 2940 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 54,244 psi | 85% | 2989 fps | 97% |
| ADI AR 2208 | <<locked>> | 82% | 55,172 psi | 86% | 2851 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 54,317 psi | 85% | 2933 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 96% | 55,709 psi | 87% | 2992 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 46,702 psi | 73% | 2822 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,423 psi | 65% | 2776 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 56,434 psi | 88% | 2874 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,360 psi | 85% | 2940 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 55,535 psi | 87% | 2956 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 57,522 psi | 90% | 2982 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 96% | 55,521 psi | 87% | 2989 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 98% | 56,695 psi | 89% | 2966 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,170 psi | 82% | 2966 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 57,087 psi | 89% | 3058 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 54,476 psi | 85% | 2969 fps | 98.9% |
| Bofors RP3 | <<locked>> | 82% | 57,450 psi | 90% | 2890 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,283 psi | 76% | 2894 fps | 97.3% |
| Bofors RP5 | <<locked>> | 96% | 55,521 psi | 87% | 2989 fps | 99.1% |
| Bofors RP7 | <<locked>> | 86% | 56,463 psi | 88% | 2887 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,459 psi | 81% | 2913 fps | 98.2% |
| Hodgdon H380 | <<locked>> | 82% | 57,609 psi | 90% | 2913 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 55,347 psi | 87% | 2936 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 84% | 54,665 psi | 86% | 2897 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 94% | 55,941 psi | 88% | 2936 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 54,824 psi | 86% | 2917 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 54,911 psi | 86% | 2867 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,140 psi | 80% | 3022 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 86% | 55,724 psi | 87% | 2976 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,941 psi | 58% | 1824 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,244 psi | 85% | 2871 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,433 psi | 85% | 2858 fps | 99.6% |
| IMR 4831 | <<locked>> | 90% | 57,624 psi | 90% | 2930 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 57,014 psi | 89% | 2920 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 98% | 57,363 psi | 90% | 3031 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 54,868 psi | 86% | 2858 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,594 psi | 89% | 2904 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,229 psi | 83% | 2864 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 55,129 psi | 86% | 2923 fps | 98.8% |
| Norma MRP | <<locked>> | 94% | 55,361 psi | 87% | 3012 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 55,869 psi | 88% | 2927 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 53,998 psi | 85% | 2986 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 88% | 54,563 psi | 86% | 2927 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 56,434 psi | 88% | 2989 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,666 psi | 59% | 1864 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,145 psi | 90% | 2897 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 55,071 psi | 86% | 2946 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,305 psi | 90% | 2963 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 55,622 psi | 87% | 2992 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 51,692 psi | 81% | 3022 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 84% | 57,711 psi | 90% | 2890 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 55,811 psi | 87% | 2907 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 94% | 57,000 psi | 89% | 2969 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 86% | 56,463 psi | 88% | 2887 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 54,868 psi | 86% | 2858 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,594 psi | 89% | 2904 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 55,550 psi | 87% | 2897 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,259 psi | 85% | 2717 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,172 psi | 85% | 2808 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 56,550 psi | 89% | 2966 fps | 99.2% |
| Somchem S355 | <<locked>> | 84% | 57,276 psi | 90% | 2884 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 57,406 psi | 90% | 2900 fps | 97.8% |
| Somchem S365 | <<locked>> | 90% | 55,970 psi | 88% | 2927 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 57,682 psi | 90% | 2946 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 55,056 psi | 86% | 2805 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,566 psi | 90% | 2913 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 57,000 psi | 89% | 2920 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 88% | 56,739 psi | 89% | 2920 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 55,376 psi | 87% | 2943 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 55,303 psi | 87% | 3005 fps | 97.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 54,839 psi | 86% | 2979 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 57,276 psi | 90% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 55,564 psi | 87% | 2940 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 53,751 psi | 84% | 3045 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 57,725 psi | 90% | 2943 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% | 32,460 psi | 51% | 2451 fps | 95.7% |
| Accurate 4350 | <<locked>> | 80% | 43,700 psi | 68% | 2713 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 90% | 47,137 psi | 74% | 2858 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 51,866 psi | 81% | 2799 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 39,059 psi | 61% | 2638 fps | 95.2% |
| ADI AR 2213 | 75.3 gr | 90% | 45,527 psi | 71% | 2805 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 98% | 43,584 psi | 68% | 2756 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 94% | 34,171 psi | 54% | 2589 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,866 psi | 83% | 2822 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,930 psi | 66% | 2723 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,356 psi | 76% | 2844 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,059 psi | 61% | 2635 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 86% | 39,755 psi | 62% | 2690 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,227 psi | 49% | 2480 fps | 98.7% |
| Alliant Reloder-25 | <<locked>> | 84% | 31,111 psi | 49% | 2497 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,866 psi | 53% | 2608 fps | 97.7% |
| Bofors RP15 | <<locked>> | 88% | 39,407 psi | 62% | 2680 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 53,722 psi | 84% | 2838 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 42,134 psi | 66% | 2772 fps | 95.6% |
| Bofors RP5 | <<locked>> | 86% | 39,755 psi | 62% | 2690 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 46,746 psi | 73% | 2723 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 94% | 41,959 psi | 66% | 2726 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 53,954 psi | 85% | 2858 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,310 psi | 71% | 2759 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 80% | 47,964 psi | 75% | 2779 fps | 98% |
| Hodgdon H4831 | <<locked>> | 88% | 45,527 psi | 71% | 2753 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 90% | 47,790 psi | 75% | 2795 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,595 psi | 62% | 2612 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 39,363 psi | 62% | 2762 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 44,672 psi | 70% | 2782 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,630 psi | 43% | 1627 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,279 psi | 66% | 2651 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,022 psi | 75% | 2746 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 41,698 psi | 65% | 2661 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 44,353 psi | 70% | 2694 fps | 95% |
| IMR 7828 SSC | <<locked>> | 90% | 43,685 psi | 68% | 2779 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 45,701 psi | 72% | 2700 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 43,976 psi | 69% | 2684 fps | 98.4% |
| Lovex S071 | <<locked>> | 84% | 31,923 psi | 50% | 2438 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 42,090 psi | 66% | 2680 fps | 96% |
| Norma MRP | 70.8 gr | 82% | 36,187 psi | 57% | 2635 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 43,004 psi | 67% | 2703 fps | 99.6% |
| Ramshot Grand | <<locked>> | 90% | 43,569 psi | 68% | 2792 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 41,858 psi | 66% | 2697 fps | 98.5% |
| Ramshot Magnum | <<locked>> | 88% | 36,158 psi | 57% | 2602 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,181 psi | 44% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,635 psi | 84% | 2844 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,314 psi | 80% | 2890 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,569 psi | 68% | 2733 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,785 psi | 65% | 2743 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 36,158 psi | 57% | 2674 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 50,705 psi | 79% | 2789 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 43,105 psi | 68% | 2677 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 82% | 38,348 psi | 60% | 2618 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 46,746 psi | 73% | 2723 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,701 psi | 72% | 2700 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 80% | 43,976 psi | 69% | 2684 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,011 psi | 82% | 2841 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,981 psi | 80% | 2671 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,773 psi | 70% | 2644 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,014 psi | 60% | 2615 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 50,647 psi | 79% | 2782 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 47,050 psi | 74% | 2723 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 39,885 psi | 63% | 2661 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,347 psi | 57% | 2546 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 48,399 psi | 76% | 2707 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,382 psi | 70% | 2700 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 38,450 psi | 60% | 2585 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 43,874 psi | 69% | 2703 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 34,940 psi | 55% | 2559 fps | 98.7% |
| Vihtavuori N560 | 76 gr | 88% | 44,933 psi | 70% | 2815 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 94% | 44,686 psi | 70% | 2795 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,497 psi | 68% | 2664 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,513 psi | 71% | 2766 fps | 98.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,688 psi | 43% | 2477 fps | 98.5% |
| Winchester Supreme 780 | <<locked>> | 86% | 40,799 psi | 64% | 2641 fps | 95.9% |
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 | 180gr | Speer Hot-Cor. Alliant Reloder-26 delivers the highest muzzle velocity at 3,058 fps; across all powders the maximum-charge window runs from 1,824 fps to 3,058 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 180.0 gr projectile in 0.308" calls for a 1:14.5 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, ADI AR 2213 rank at the top here: for .300 Weath. Mag. with the .308 | 180gr | Speer Hot-Cor they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Baschieri & Pellagri 109, 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.