Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 220gr | Woodleigh RN SN bullet and 71 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 76, Hodgdon Retumbo 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>> | 92% | 56,507 psi | 89% | 2651 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 53,853 psi | 84% | 2618 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 55,172 psi | 86% | 2749 fps | 98.9% |
| ADI AR 2209 | <<locked>> | 88% | 54,665 psi | 86% | 2680 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 56,115 psi | 88% | 2746 fps | 99.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,056 psi | 85% | 2717 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,457 psi | 76% | 2680 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,071 psi | 86% | 2671 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 54,259 psi | 85% | 2674 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,362 psi | 88% | 2740 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 54,317 psi | 85% | 2657 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 57,595 psi | 90% | 2772 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 54,462 psi | 85% | 2740 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 50,720 psi | 79% | 2736 fps | 96.6% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,261 psi | 90% | 2710 fps | 97.9% |
| Bofors RP15 | <<locked>> | 94% | 55,550 psi | 87% | 2726 fps | 99.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 57,145 psi | 90% | 2782 fps | 99.9% |
| Bofors RP5 | <<locked>> | 92% | 56,362 psi | 88% | 2740 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 55,695 psi | 87% | 2618 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 55,825 psi | 87% | 2740 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 55,477 psi | 87% | 2674 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 55,941 psi | 88% | 2687 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,824 psi | 86% | 2667 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,201 psi | 87% | 2598 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,304 psi | 88% | 2848 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,883 psi | 88% | 2710 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,507 psi | 59% | 1654 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 57,522 psi | 90% | 2661 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,942 psi | 89% | 2638 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 54,288 psi | 85% | 2615 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,652 psi | 89% | 2664 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 92% | 54,447 psi | 85% | 2730 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,063 psi | 69% | 2595 fps | 98.2% |
| Lovex S065 | <<locked>> | 82% | 54,534 psi | 85% | 2589 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,188 psi | 88% | 2638 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 54,201 psi | 85% | 2621 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,027 psi | 86% | 2664 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 44,585 psi | 70% | 2621 fps | 99.7% |
| Norma MRP | <<locked>> | 90% | 56,492 psi | 89% | 2759 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,840 psi | 88% | 2651 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,056 psi | 86% | 2749 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 54,795 psi | 86% | 2664 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 57,580 psi | 90% | 2740 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,363 psi | 60% | 1693 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,682 psi | 90% | 2694 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,086 psi | 88% | 2720 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,985 psi | 89% | 2844 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,275 psi | 88% | 2812 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 88% | 55,680 psi | 87% | 2654 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 90% | 57,624 psi | 90% | 2717 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 55,695 psi | 87% | 2618 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 54,534 psi | 85% | 2589 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,188 psi | 88% | 2638 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,985 psi | 89% | 2595 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,188 psi | 90% | 2713 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 56,927 psi | 89% | 2648 fps | 99.2% |
| Somchem S365 | <<locked>> | 86% | 56,768 psi | 89% | 2654 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 54,360 psi | 85% | 2638 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 57,653 psi | 90% | 2644 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,638 psi | 90% | 2674 fps | 100% |
| Vihtavuori N170 | <<locked>> | 98% | 56,086 psi | 88% | 2687 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 84% | 56,608 psi | 89% | 2651 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,536 psi | 89% | 2680 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,115 psi | 88% | 2759 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 96% | 56,246 psi | 88% | 2746 fps | 99.5% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 57,116 psi | 90% | 2808 fps | 99% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 53,824 psi | 84% | 2799 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,811 psi | 89% | 2602 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,477 psi | 87% | 2674 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 56,637 psi | 89% | 2789 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,696 psi | 90% | 2684 fps | 100% |
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% | 37,942 psi | 59% | 2352 fps | 99.3% |
| Accurate 4350 | <<locked>> | 80% | 50,430 psi | 79% | 2569 fps | 100% |
| Accurate MAGPRO | 68.8 gr | 80% | 38,914 psi | 61% | 2454 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 42,003 psi | 66% | 2467 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 80% | 37,434 psi | 59% | 2405 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 88% | 36,303 psi | 57% | 2382 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 84% | 28,877 psi | 45% | 2241 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,225 psi | 76% | 2572 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,945 psi | 66% | 2461 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,840 psi | 59% | 2415 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,622 psi | 57% | 2372 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,720 psi | 50% | 2303 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,567 psi | 64% | 2516 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 47,050 psi | 74% | 2671 fps | 95.5% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 47,659 psi | 75% | 2549 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 35,259 psi | 55% | 2356 fps | 96.4% |
| Bofors RP30 | <<locked>> | 86% | 35,723 psi | 56% | 2398 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 37,840 psi | 59% | 2415 fps | 97.4% |
| Bofors RP7 | <<locked>> | 80% | 52,330 psi | 82% | 2569 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 34,606 psi | 54% | 2346 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 51,837 psi | 81% | 2618 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 39,885 psi | 63% | 2408 fps | 96% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,233 psi | 61% | 2395 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,527 psi | 71% | 2464 fps | 100% |
| Hodgdon Retumbo | 65.1 gr | 80% | 30,951 psi | 49% | 2323 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 51,953 psi | 81% | 2654 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,079 psi | 44% | 1473 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,805 psi | 75% | 2513 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,548 psi | 84% | 2589 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,776 psi | 75% | 2520 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,553 psi | 65% | 2408 fps | 96.6% |
| IMR 7828 SSC | <<locked>> | 80% | 36,187 psi | 57% | 2388 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 94% | 36,216 psi | 57% | 2431 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 51,256 psi | 80% | 2543 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,647 psi | 78% | 2539 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 32,793 psi | 51% | 2241 fps | 98.1% |
| Norma 204 | <<locked>> | 80% | 48,008 psi | 75% | 2556 fps | 99.2% |
| Norma 217 | <<locked>> | 88% | 29,791 psi | 47% | 2290 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 39,755 psi | 62% | 2480 fps | 99% |
| Norma URP | <<locked>> | 80% | 49,153 psi | 77% | 2556 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 35,824 psi | 56% | 2395 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 47,921 psi | 75% | 2559 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 31,923 psi | 50% | 2283 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,732 psi | 45% | 1509 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,372 psi | 79% | 2592 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,530 psi | 76% | 2612 fps | 100% |
| ReloadSwiss RS 76 | 69.6 gr | 80% | 29,820 psi | 47% | 2293 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 38,595 psi | 60% | 2497 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 43,149 psi | 68% | 2448 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 80% | 41,394 psi | 65% | 2451 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 80% | 52,330 psi | 82% | 2569 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,256 psi | 80% | 2543 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,647 psi | 78% | 2539 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,241 psi | 79% | 2500 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,060 psi | 64% | 2444 fps | 98.2% |
| Somchem S361 | <<locked>> | 80% | 43,758 psi | 69% | 2438 fps | 97% |
| Somchem S365 | <<locked>> | 80% | 46,572 psi | 73% | 2516 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,901 psi | 66% | 2431 fps | 99% |
| Vihtavuori N160 | <<locked>> | 80% | 50,575 psi | 79% | 2546 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,419 psi | 57% | 2320 fps | 97.5% |
| Vihtavuori N170 | <<locked>> | 96% | 52,402 psi | 82% | 2628 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 49,821 psi | 78% | 2552 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,046 psi | 64% | 2444 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 39,755 psi | 62% | 2470 fps | 96.1% |
| Vihtavuori N565 | <<locked>> | 84% | 37,594 psi | 59% | 2415 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 90% | 40,118 psi | 63% | 2513 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 96% | 46,731 psi | 73% | 2674 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,574 psi | 78% | 2507 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,054 psi | 82% | 2625 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,214 psi | 52% | 2408 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,392 psi | 60% | 2365 fps | 97.4% |
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 76 powders for .300 Weath. Mag. loaded with the .308 | 220gr | Woodleigh RN SN. Hodgdon Retumbo delivers the highest muzzle velocity at 2,848 fps; across all powders the maximum-charge window runs from 1,654 fps to 2,848 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 220.0 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 2218, ADI AR 2225 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. ReloadSwiss RS 76, Hodgdon Retumbo, Accurate MAGPRO rank at the top here: for .300 Weath. Mag. with the .308 | 220gr | Woodleigh RN SN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, IMR 7977 Enduron 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.