Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 200gr | Swift A-Frame 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, Vihtavuori N560 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% | 55,143 psi | 86% | 2753 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,594 psi | 89% | 2782 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 57,624 psi | 90% | 2904 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 82% | 57,319 psi | 90% | 2733 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,232 psi | 90% | 2838 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 94% | 54,882 psi | 86% | 2841 fps | 98.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,139 psi | 77% | 2743 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,787 psi | 69% | 2703 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,334 psi | 90% | 2835 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,781 psi | 86% | 2795 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,739 psi | 89% | 2828 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,926 psi | 86% | 2838 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,086 psi | 88% | 2808 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,448 psi | 87% | 2871 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,579 psi | 89% | 2900 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,695 psi | 89% | 2805 fps | 96.6% |
| Bofors RP15 | <<locked>> | 98% | 57,740 psi | 90% | 2881 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,372 psi | 81% | 2812 fps | 98.8% |
| Bofors RP5 | <<locked>> | 94% | 54,926 psi | 86% | 2838 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 55,216 psi | 87% | 2726 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,288 psi | 85% | 2828 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 84% | 54,462 psi | 85% | 2779 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 57,159 psi | 90% | 2792 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 54,926 psi | 86% | 2782 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,479 psi | 90% | 2822 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,580 psi | 90% | 2756 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,172 psi | 85% | 2936 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 54,737 psi | 86% | 2815 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,086 psi | 58% | 1722 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,855 psi | 89% | 2769 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,782 psi | 89% | 2753 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 56,753 psi | 89% | 2772 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,970 psi | 88% | 2769 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 96% | 56,449 psi | 88% | 2877 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 57,392 psi | 90% | 2749 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,463 psi | 87% | 2746 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,304 psi | 88% | 2769 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,085 psi | 85% | 2766 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 39,523 psi | 62% | 2635 fps | 98.1% |
| Norma MRP | <<locked>> | 92% | 54,766 psi | 86% | 2861 fps | 100% |
| Norma URP | <<locked>> | 86% | 54,868 psi | 86% | 2762 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,421 psi | 90% | 2904 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 88% | 57,392 psi | 90% | 2825 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,666 psi | 87% | 2838 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,072 psi | 60% | 1765 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,550 psi | 89% | 2805 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,781 psi | 86% | 2831 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,911 psi | 86% | 2940 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 49,734 psi | 78% | 2825 fps | 97.2% |
| Rottweil R 903 | <<locked>> | 82% | 56,768 psi | 89% | 2730 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,911 psi | 86% | 2756 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 92% | 56,202 psi | 88% | 2815 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 55,216 psi | 87% | 2726 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,392 psi | 90% | 2749 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,463 psi | 87% | 2746 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,420 psi | 88% | 2602 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,536 psi | 89% | 2707 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,753 psi | 87% | 2812 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 56,173 psi | 88% | 2720 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,318 psi | 88% | 2749 fps | 98.4% |
| Somchem S365 | <<locked>> | 88% | 55,332 psi | 87% | 2766 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,739 psi | 89% | 2789 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 57,377 psi | 90% | 2690 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,739 psi | 89% | 2756 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,260 psi | 88% | 2772 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 55,927 psi | 88% | 2762 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,013 psi | 86% | 2789 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,621 psi | 86% | 2854 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 98% | 54,273 psi | 85% | 2835 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 50,894 psi | 80% | 2828 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,043 psi | 88% | 2717 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,665 psi | 86% | 2782 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 53,679 psi | 84% | 2890 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,637 psi | 89% | 2785 fps | 99.6% |
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% | 34,534 psi | 54% | 2382 fps | 97.6% |
| Accurate 4350 | <<locked>> | 80% | 46,267 psi | 73% | 2625 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 43,366 psi | 68% | 2654 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 54,070 psi | 85% | 2690 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,450 psi | 60% | 2500 fps | 96.2% |
| ADI AR 2213 | <<locked>> | 84% | 39,247 psi | 62% | 2546 fps | 95% |
| ADI AR 2217 | <<locked>> | 94% | 40,408 psi | 63% | 2572 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 90% | 31,865 psi | 50% | 2415 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,222 psi | 69% | 2628 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,039 psi | 80% | 2740 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,566 psi | 60% | 2500 fps | 96.3% |
| Alliant Reloder-22 | <<locked>> | 82% | 36,796 psi | 58% | 2497 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,127 psi | 52% | 2408 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,819 psi | 45% | 2316 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,143 psi | 57% | 2543 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,111 psi | 79% | 2694 fps | 95% |
| Bofors RP15 | <<locked>> | 84% | 36,463 psi | 57% | 2490 fps | 95.5% |
| Bofors RP30 | <<locked>> | 92% | 39,204 psi | 61% | 2582 fps | 95.8% |
| Bofors RP5 | <<locked>> | 82% | 36,796 psi | 58% | 2497 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 48,834 psi | 77% | 2625 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 90% | 38,638 psi | 61% | 2536 fps | 95.8% |
| Hodgdon H414 | <<locked>> | 80% | 47,688 psi | 75% | 2667 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 80% | 50,357 psi | 79% | 2684 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 84% | 41,814 psi | 66% | 2552 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 84% | 41,162 psi | 65% | 2536 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,800 psi | 66% | 2516 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 34,258 psi | 54% | 2510 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 47,181 psi | 74% | 2694 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,804 psi | 44% | 1539 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,222 psi | 69% | 2559 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,140 psi | 79% | 2648 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 44,034 psi | 69% | 2572 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 40,930 psi | 64% | 2500 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 86% | 40,437 psi | 63% | 2585 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 47,790 psi | 75% | 2602 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 46,108 psi | 72% | 2592 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 29,762 psi | 47% | 2264 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 44,324 psi | 69% | 2598 fps | 97.7% |
| Norma 217 | <<locked>> | 94% | 32,518 psi | 51% | 2461 fps | 95.2% |
| Norma MRP | 67 gr | 80% | 35,969 psi | 56% | 2507 fps | 97% |
| Norma URP | <<locked>> | 80% | 45,310 psi | 71% | 2612 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 40,089 psi | 63% | 2592 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 44,121 psi | 69% | 2608 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 84% | 33,243 psi | 52% | 2415 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,398 psi | 45% | 1575 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,006 psi | 72% | 2641 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,324 psi | 69% | 2661 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 33,257 psi | 52% | 2484 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 42,801 psi | 67% | 2690 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 53,229 psi | 83% | 2680 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 39,929 psi | 63% | 2484 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 80% | 37,869 psi | 59% | 2484 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 80% | 48,834 psi | 77% | 2625 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,790 psi | 75% | 2602 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 46,108 psi | 72% | 2592 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,127 psi | 83% | 2559 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,702 psi | 73% | 2552 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,565 psi | 59% | 2477 fps | 96.1% |
| Somchem S355 | <<locked>> | 80% | 52,953 psi | 83% | 2674 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 43,352 psi | 68% | 2530 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 42,250 psi | 66% | 2569 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,479 psi | 60% | 2470 fps | 97.3% |
| Vihtavuori N150 | <<locked>> | 80% | 50,720 psi | 79% | 2602 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,760 psi | 73% | 2605 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,330 psi | 52% | 2349 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 46,093 psi | 72% | 2608 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,130 psi | 58% | 2480 fps | 99.7% |
| Vihtavuori N560 | 70.3 gr | 84% | 41,452 psi | 65% | 2615 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 90% | 41,597 psi | 65% | 2605 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 96% | 44,353 psi | 70% | 2707 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,803 psi | 72% | 2569 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,906 psi | 75% | 2674 fps | 99.5% |
| Winchester StaBALL HD | 66.3 gr | 80% | 29,443 psi | 46% | 2428 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 34,983 psi | 55% | 2392 fps | 95% |
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 79 powders for .300 Weath. Mag. loaded with the .308 | 200gr | Swift A-Frame. ReloadSwiss RS 76 delivers the highest muzzle velocity at 2,940 fps; across all powders the maximum-charge window runs from 1,722 fps to 2,940 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 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 200.0 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. Winchester StaBALL HD, Vihtavuori N560, Norma MRP rank at the top here: for .300 Weath. Mag. with the .308 | 200gr | Swift A-Frame they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 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.