Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 180gr | Winchester SPRN Pow.Point bullet and 74 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, IMR 7828 SSC and Norma MRP.
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>> | 94% | 54,288 psi | 85% | 2887 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,767 psi | 87% | 2923 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 56,710 psi | 89% | 3035 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 82% | 56,739 psi | 89% | 2884 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,478 psi | 89% | 2976 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 94% | 54,186 psi | 85% | 2976 fps | 98.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,501 psi | 76% | 2867 fps | 97.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,221 psi | 68% | 2822 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,492 psi | 89% | 2976 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 53,954 psi | 85% | 2936 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,927 psi | 88% | 2963 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,201 psi | 85% | 2972 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,405 psi | 87% | 2949 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,592 psi | 86% | 3009 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 55,709 psi | 87% | 3038 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 56,768 psi | 89% | 3015 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,705 psi | 79% | 2940 fps | 98% |
| Bofors RP5 | <<locked>> | 94% | 54,201 psi | 85% | 2972 fps | 99.1% |
| Bofors RP7 | <<locked>> | 84% | 54,520 psi | 85% | 2864 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,577 psi | 84% | 2963 fps | 98.8% |
| Hodgdon H414 | <<locked>> | 86% | 57,421 psi | 90% | 2976 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 56,318 psi | 88% | 2930 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 54,201 psi | 85% | 2917 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,782 psi | 89% | 2959 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 56,884 psi | 89% | 2900 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,432 psi | 84% | 3071 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 84% | 53,998 psi | 85% | 2953 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,115 psi | 58% | 1841 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,159 psi | 88% | 2907 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,014 psi | 88% | 2890 fps | 99.8% |
| IMR 4831 | <<locked>> | 88% | 56,043 psi | 88% | 2913 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,332 psi | 87% | 2904 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 96% | 55,753 psi | 87% | 3012 fps | 98.4% |
| Lovex S065 | <<locked>> | 86% | 56,710 psi | 89% | 2894 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 54,897 psi | 86% | 2887 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,390 psi | 87% | 2904 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,087 psi | 89% | 2959 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 38,914 psi | 61% | 2746 fps | 96.9% |
| Norma MRP | <<locked>> | 92% | 53,853 psi | 84% | 2992 fps | 99.7% |
| Norma URP | <<locked>> | 86% | 54,244 psi | 85% | 2907 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,536 psi | 89% | 3035 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 88% | 56,507 psi | 89% | 2959 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 54,737 psi | 86% | 2966 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,826 psi | 59% | 1880 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,406 psi | 90% | 2979 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,738 psi | 87% | 2946 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 53,954 psi | 85% | 2972 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,273 psi | 85% | 3074 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 48,979 psi | 77% | 2943 fps | 96.1% |
| Rottweil R 903 | <<locked>> | 82% | 55,927 psi | 88% | 2871 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 57,711 psi | 90% | 2946 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 92% | 55,434 psi | 87% | 2953 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 84% | 54,520 psi | 85% | 2864 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,710 psi | 89% | 2894 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 54,897 psi | 86% | 2887 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,290 psi | 90% | 2927 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,651 psi | 87% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 55,869 psi | 88% | 2844 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,027 psi | 86% | 2949 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 55,506 psi | 87% | 2864 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,608 psi | 87% | 2881 fps | 97.7% |
| Somchem S365 | <<locked>> | 88% | 54,534 psi | 85% | 2910 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,072 psi | 88% | 2927 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 84% | 56,840 psi | 89% | 2838 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 55,970 psi | 88% | 2900 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,434 psi | 87% | 2904 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 86% | 55,201 psi | 87% | 2904 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,099 psi | 85% | 2927 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 57,624 psi | 90% | 3051 fps | 98.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 57,421 psi | 90% | 3025 fps | 98.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,448 psi | 87% | 2858 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,638 psi | 90% | 2979 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 98% | 56,956 psi | 89% | 3087 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,014 psi | 88% | 2923 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% | 33,837 psi | 53% | 2487 fps | 96.5% |
| Accurate 4350 | <<locked>> | 80% | 45,368 psi | 71% | 2753 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 88% | 45,803 psi | 72% | 2838 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 53,272 psi | 83% | 2828 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 37,942 psi | 59% | 2618 fps | 95% |
| ADI AR 2213 | <<locked>> | 88% | 44,208 psi | 69% | 2785 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 96% | 42,598 psi | 67% | 2743 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 92% | 33,359 psi | 52% | 2572 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,410 psi | 68% | 2756 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,270 psi | 79% | 2877 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 37,855 psi | 59% | 2612 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 84% | 38,609 psi | 61% | 2667 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,445 psi | 51% | 2516 fps | 99.1% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,269 psi | 47% | 2477 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,462 psi | 56% | 2651 fps | 98.4% |
| Bofors RP15 | <<locked>> | 86% | 38,406 psi | 60% | 2661 fps | 95.2% |
| Bofors RP30 | <<locked>> | 94% | 41,191 psi | 65% | 2753 fps | 95.5% |
| Bofors RP5 | <<locked>> | 84% | 38,609 psi | 61% | 2667 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 48,211 psi | 76% | 2756 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 92% | 40,756 psi | 64% | 2710 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 47,021 psi | 74% | 2799 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 80% | 49,661 psi | 78% | 2818 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 86% | 44,295 psi | 69% | 2733 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 88% | 46,383 psi | 73% | 2776 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,060 psi | 64% | 2644 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 38,334 psi | 60% | 2743 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 46,601 psi | 73% | 2822 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,760 psi | 44% | 1644 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,700 psi | 68% | 2687 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,472 psi | 78% | 2782 fps | 99.2% |
| IMR 4831 | <<locked>> | 80% | 43,250 psi | 68% | 2697 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 86% | 45,890 psi | 72% | 2733 fps | 95.7% |
| IMR 7828 SSC | 75.7 gr | 88% | 42,482 psi | 67% | 2759 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 47,007 psi | 74% | 2730 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 45,440 psi | 71% | 2720 fps | 98.8% |
| Lovex S071 | <<locked>> | 82% | 31,096 psi | 49% | 2418 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 43,642 psi | 68% | 2720 fps | 96.7% |
| Norma 217 | <<locked>> | 98% | 36,390 psi | 57% | 2684 fps | 95.9% |
| Norma MRP | 71.5 gr | 80% | 35,215 psi | 55% | 2612 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 44,585 psi | 70% | 2740 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 42,308 psi | 66% | 2769 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 43,453 psi | 68% | 2733 fps | 98.9% |
| Ramshot Magnum | <<locked>> | 86% | 35,215 psi | 55% | 2582 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,297 psi | 44% | 1680 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,388 psi | 84% | 2923 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,281 psi | 71% | 2769 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,511 psi | 68% | 2785 fps | 99.7% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,143 psi | 55% | 2651 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 45,513 psi | 71% | 2874 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 52,431 psi | 82% | 2822 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 41,959 psi | 66% | 2657 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 80% | 37,202 psi | 58% | 2595 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 48,211 psi | 76% | 2756 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,007 psi | 74% | 2730 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 45,440 psi | 71% | 2720 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,780 psi | 84% | 2874 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,417 psi | 82% | 2700 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,108 psi | 72% | 2680 fps | 98.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 39,450 psi | 62% | 2651 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 52,098 psi | 82% | 2812 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 45,687 psi | 72% | 2707 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 41,568 psi | 65% | 2697 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,826 psi | 59% | 2585 fps | 96.2% |
| Vihtavuori N150 | <<locked>> | 80% | 49,966 psi | 78% | 2736 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,919 psi | 72% | 2733 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 37,449 psi | 59% | 2569 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 45,324 psi | 71% | 2736 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 36,477 psi | 57% | 2595 fps | 99.1% |
| Vihtavuori N560 | <<locked>> | 86% | 43,758 psi | 69% | 2795 fps | 95% |
| Vihtavuori N565 | <<locked>> | 92% | 43,816 psi | 69% | 2782 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,136 psi | 71% | 2697 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,166 psi | 74% | 2802 fps | 99% |
| Winchester StaBALL HD | 70.8 gr | 80% | 28,877 psi | 45% | 2523 fps | 99.2% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,595 psi | 62% | 2621 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 74 powders for .300 Weath. Mag. loaded with the .308 | 180gr | Winchester SPRN Pow.Point. Winchester StaBALL HD delivers the highest muzzle velocity at 3,087 fps; across all powders the maximum-charge window runs from 1,841 fps to 3,087 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 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 1:6.0 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. Winchester StaBALL HD, IMR 7828 SSC, Norma MRP rank at the top here: for .300 Weath. Mag. with the .308 | 180gr | Winchester SPRN Pow.Point 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.