Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 205gr | Sierra GameKing bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Ramshot Grand 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>> | 94% | 56,463 psi | 88% | 2740 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,201 psi | 85% | 2717 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 55,114 psi | 86% | 2838 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 90% | 54,853 psi | 86% | 2772 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 56,188 psi | 88% | 2835 fps | 99.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,531 psi | 79% | 2740 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,107 psi | 71% | 2703 fps | 99.8% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 55,071 psi | 86% | 2772 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,172 psi | 86% | 2769 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,130 psi | 88% | 2779 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,418 psi | 85% | 2762 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,260 psi | 88% | 2828 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 96% | 57,508 psi | 90% | 2795 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,927 psi | 89% | 2858 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 54,114 psi | 85% | 2831 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,696 psi | 90% | 2795 fps | 97.2% |
| Bofors RP15 | <<locked>> | 96% | 55,434 psi | 87% | 2815 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,779 psi | 83% | 2805 fps | 99.2% |
| Bofors RP5 | <<locked>> | 94% | 56,260 psi | 88% | 2828 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 56,289 psi | 88% | 2713 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,608 psi | 87% | 2825 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 84% | 55,651 psi | 87% | 2766 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 54,752 psi | 86% | 2726 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 56,188 psi | 88% | 2776 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,056 psi | 86% | 2756 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,405 psi | 87% | 2697 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,840 psi | 88% | 2933 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 56,101 psi | 88% | 2805 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,217 psi | 58% | 1706 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,476 psi | 85% | 2703 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 54,375 psi | 85% | 2687 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 54,462 psi | 85% | 2710 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,087 psi | 89% | 2756 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 94% | 54,114 psi | 85% | 2812 fps | 99% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 40,625 psi | 64% | 2608 fps | 96.5% |
| Lovex S065 | <<locked>> | 84% | 54,984 psi | 86% | 2684 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,594 psi | 89% | 2733 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,653 psi | 90% | 2756 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,274 psi | 87% | 2756 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 40,712 psi | 64% | 2631 fps | 98.6% |
| Norma MRP | <<locked>> | 92% | 56,188 psi | 88% | 2848 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,101 psi | 88% | 2749 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,752 psi | 86% | 2831 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 54,897 psi | 86% | 2756 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 57,232 psi | 90% | 2828 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,029 psi | 60% | 1745 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,085 psi | 85% | 2740 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,202 psi | 88% | 2818 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,666 psi | 89% | 2933 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,503 psi | 81% | 2825 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 82% | 57,725 psi | 90% | 2710 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 56,057 psi | 88% | 2746 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 92% | 57,493 psi | 90% | 2805 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 84% | 56,289 psi | 88% | 2713 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,984 psi | 86% | 2684 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,594 psi | 89% | 2733 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,464 psi | 90% | 2582 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,624 psi | 90% | 2694 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,058 psi | 89% | 2802 fps | 99.8% |
| Somchem S355 | <<locked>> | 82% | 57,319 psi | 90% | 2703 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,450 psi | 90% | 2740 fps | 98.8% |
| Somchem S365 | <<locked>> | 88% | 56,710 psi | 89% | 2753 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,462 psi | 85% | 2726 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 54,955 psi | 86% | 2628 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,389 psi | 85% | 2694 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,522 psi | 90% | 2759 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 57,116 psi | 90% | 2749 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,391 psi | 88% | 2776 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,970 psi | 88% | 2844 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 98% | 55,898 psi | 88% | 2828 fps | 99% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,605 psi | 82% | 2828 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,290 psi | 90% | 2700 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,883 psi | 88% | 2769 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,535 psi | 87% | 2877 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,186 psi | 85% | 2723 fps | 99.5% |
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% | 35,476 psi | 56% | 2379 fps | 98.2% |
| Accurate 4350 | <<locked>> | 80% | 47,413 psi | 74% | 2615 fps | 100% |
| Accurate MAGPRO | 71.8 gr | 84% | 41,524 psi | 65% | 2589 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 39,378 psi | 62% | 2493 fps | 96.8% |
| ADI AR 2213 | <<locked>> | 84% | 40,190 psi | 63% | 2543 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 92% | 38,711 psi | 61% | 2510 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 88% | 30,676 psi | 48% | 2359 fps | 95.3% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,885 psi | 63% | 2497 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,353 psi | 71% | 2618 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,315 psi | 82% | 2726 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,508 psi | 62% | 2493 fps | 96.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,317 psi | 55% | 2438 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,069 psi | 53% | 2402 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,559 psi | 46% | 2316 fps | 96.8% |
| Alliant Reloder-26 | 69.2 gr | 80% | 37,275 psi | 58% | 2536 fps | 99.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 51,010 psi | 80% | 2687 fps | 95.6% |
| Bofors RP15 | <<locked>> | 82% | 35,056 psi | 55% | 2431 fps | 95.3% |
| Bofors RP30 | <<locked>> | 90% | 37,710 psi | 59% | 2523 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 35,317 psi | 55% | 2438 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 49,835 psi | 78% | 2615 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 88% | 37,043 psi | 58% | 2474 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 48,805 psi | 76% | 2657 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 80% | 51,430 psi | 81% | 2674 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 40,103 psi | 63% | 2490 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 84% | 42,148 psi | 66% | 2533 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,830 psi | 67% | 2507 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 35,157 psi | 55% | 2510 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 48,370 psi | 76% | 2687 fps | 99.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,920 psi | 44% | 1522 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,150 psi | 71% | 2549 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,082 psi | 80% | 2635 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 44,889 psi | 70% | 2559 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 41,814 psi | 66% | 2493 fps | 95.8% |
| IMR 7828 SSC | <<locked>> | 84% | 38,740 psi | 61% | 2523 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 98% | 38,029 psi | 60% | 2549 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 48,762 psi | 76% | 2589 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 47,108 psi | 74% | 2582 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 30,618 psi | 48% | 2260 fps | 96.5% |
| Norma 204 | <<locked>> | 80% | 45,150 psi | 71% | 2589 fps | 98.1% |
| Norma 217 | <<locked>> | 92% | 31,328 psi | 49% | 2405 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 36,811 psi | 58% | 2500 fps | 97.6% |
| Norma URP | <<locked>> | 80% | 46,398 psi | 73% | 2598 fps | 100% |
| Ramshot Grand | 69.9 gr | 84% | 38,319 psi | 60% | 2526 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 45,020 psi | 71% | 2595 fps | 99.7% |
| Ramshot Magnum | <<locked>> | 82% | 31,821 psi | 50% | 2352 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,558 psi | 45% | 1558 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,166 psi | 74% | 2631 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,252 psi | 71% | 2648 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 84% | 31,894 psi | 50% | 2421 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 40,988 psi | 64% | 2625 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 54,360 psi | 85% | 2664 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,654 psi | 64% | 2474 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 80% | 38,856 psi | 61% | 2480 fps | 96.9% |
| Rottweil R 907 | <<locked>> | 80% | 49,835 psi | 78% | 2615 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,762 psi | 76% | 2589 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 47,108 psi | 74% | 2582 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,114 psi | 85% | 2539 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,616 psi | 75% | 2539 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,522 psi | 60% | 2474 fps | 96.8% |
| Somchem S355 | <<locked>> | 80% | 54,056 psi | 85% | 2657 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 41,307 psi | 65% | 2464 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 43,395 psi | 68% | 2556 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,392 psi | 62% | 2464 fps | 97.8% |
| Vihtavuori N150 | <<locked>> | 80% | 51,750 psi | 81% | 2585 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,819 psi | 75% | 2592 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,171 psi | 54% | 2343 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 46,934 psi | 74% | 2592 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,174 psi | 60% | 2474 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 39,697 psi | 62% | 2549 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 88% | 39,885 psi | 63% | 2543 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 96% | 45,600 psi | 71% | 2703 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,659 psi | 73% | 2552 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,965 psi | 77% | 2661 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 30,168 psi | 47% | 2425 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,882 psi | 56% | 2388 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 75 powders for .300 Weath. Mag. loaded with the .308 | 205gr | Sierra GameKing. Hodgdon Retumbo delivers the highest muzzle velocity at 2,933 fps; across all powders the maximum-charge window runs from 1,706 fps to 2,933 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 205.0 gr projectile in 0.308" calls for a 1:13.0 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. Accurate MAGPRO, Ramshot Grand, Alliant Reloder-26 rank at the top here: for .300 Weath. Mag. with the .308 | 205gr | Sierra GameKing 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.