Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 220gr | Nosler Partition bullet and 72 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate 4350, Hodgdon Retumbo and ReloadSwiss RS 76.
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% | 55,230 psi | 87% | 2631 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,550 psi | 89% | 2651 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,653 psi | 90% | 2782 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 90% | 57,058 psi | 89% | 2710 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 54,926 psi | 86% | 2720 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,808 psi | 83% | 2690 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,326 psi | 74% | 2657 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,508 psi | 90% | 2700 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,579 psi | 89% | 2703 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,187 psi | 86% | 2720 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,637 psi | 89% | 2684 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,057 psi | 88% | 2749 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,188 psi | 90% | 2772 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 49,211 psi | 77% | 2707 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,275 psi | 88% | 2687 fps | 97.6% |
| Bofors RP15 | <<locked>> | 94% | 54,360 psi | 85% | 2707 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,724 psi | 87% | 2756 fps | 99.8% |
| Bofors RP5 | <<locked>> | 92% | 55,187 psi | 86% | 2720 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 54,824 psi | 86% | 2602 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 54,331 psi | 85% | 2713 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 54,346 psi | 85% | 2651 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,768 psi | 89% | 2664 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 54,810 psi | 86% | 2664 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,363 psi | 90% | 2700 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,725 psi | 90% | 2628 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 54,868 psi | 86% | 2825 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,636 psi | 86% | 2687 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,362 psi | 59% | 1644 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,521 psi | 89% | 2641 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,072 psi | 88% | 2618 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 56,710 psi | 89% | 2641 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,550 psi | 87% | 2644 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 94% | 56,695 psi | 89% | 2759 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,830 psi | 67% | 2569 fps | 97.9% |
| Lovex S065 | <<locked>> | 84% | 56,884 psi | 89% | 2618 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,332 psi | 87% | 2621 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,623 psi | 89% | 2648 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,609 psi | 90% | 2697 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 43,236 psi | 68% | 2595 fps | 99.5% |
| Norma MRP | <<locked>> | 90% | 54,969 psi | 86% | 2733 fps | 100% |
| Norma URP | <<locked>> | 84% | 54,940 psi | 86% | 2635 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 53,766 psi | 84% | 2726 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 86% | 57,290 psi | 90% | 2694 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,912 psi | 88% | 2717 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,218 psi | 60% | 1683 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,565 psi | 89% | 2674 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,737 psi | 86% | 2700 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,448 psi | 87% | 2822 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,505 psi | 85% | 2782 fps | 98.9% |
| Rottweil R 904 | <<locked>> | 88% | 54,679 psi | 86% | 2635 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 90% | 56,318 psi | 88% | 2694 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 54,824 psi | 86% | 2602 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,884 psi | 89% | 2618 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,332 psi | 87% | 2621 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,956 psi | 88% | 2579 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,898 psi | 88% | 2690 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 55,912 psi | 88% | 2628 fps | 99.1% |
| Somchem S365 | <<locked>> | 86% | 55,550 psi | 87% | 2638 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,681 psi | 89% | 2667 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,029 psi | 89% | 2559 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,536 psi | 89% | 2625 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,275 psi | 88% | 2651 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 55,564 psi | 87% | 2631 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,201 psi | 87% | 2661 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 54,723 psi | 86% | 2733 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 96% | 54,926 psi | 86% | 2723 fps | 99.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,303 psi | 87% | 2779 fps | 98.7% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 52,344 psi | 82% | 2772 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,680 psi | 87% | 2585 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,578 psi | 86% | 2654 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 54,839 psi | 86% | 2766 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,565 psi | 89% | 2664 fps | 99.9% |
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% | 37,130 psi | 58% | 2333 fps | 99.1% |
| Accurate 4350 | 63.4 gr | 80% | 49,385 psi | 77% | 2549 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 40,770 psi | 64% | 2490 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 41,147 psi | 64% | 2448 fps | 98% |
| ADI AR 2213 | <<locked>> | 80% | 36,709 psi | 58% | 2385 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 88% | 35,534 psi | 56% | 2359 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 86% | 30,066 psi | 47% | 2270 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,398 psi | 74% | 2556 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,104 psi | 64% | 2441 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,014 psi | 58% | 2392 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,694 psi | 56% | 2352 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,009 psi | 49% | 2283 fps | 98.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,479 psi | 62% | 2493 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 45,774 psi | 72% | 2641 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 46,688 psi | 73% | 2526 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 34,447 psi | 54% | 2333 fps | 95.9% |
| Bofors RP30 | <<locked>> | 86% | 34,824 psi | 55% | 2375 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 37,014 psi | 58% | 2392 fps | 97% |
| Bofors RP7 | <<locked>> | 80% | 51,430 psi | 81% | 2549 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 33,837 psi | 53% | 2320 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 50,952 psi | 80% | 2602 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 53,272 psi | 83% | 2612 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 39,131 psi | 61% | 2388 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 38,450 psi | 60% | 2375 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,556 psi | 70% | 2444 fps | 100% |
| Hodgdon Retumbo | 65.3 gr | 82% | 32,213 psi | 50% | 2356 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 50,720 psi | 79% | 2631 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,094 psi | 44% | 1470 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,920 psi | 74% | 2493 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,692 psi | 83% | 2569 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 46,847 psi | 73% | 2500 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,799 psi | 64% | 2388 fps | 96.3% |
| IMR 7828 SSC | <<locked>> | 82% | 37,898 psi | 59% | 2421 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 94% | 35,230 psi | 55% | 2408 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 50,343 psi | 79% | 2523 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,762 psi | 76% | 2520 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,111 psi | 50% | 2221 fps | 97.8% |
| Norma 204 | <<locked>> | 80% | 47,166 psi | 74% | 2536 fps | 99% |
| Norma 217 | <<locked>> | 90% | 30,893 psi | 48% | 2320 fps | 95.9% |
| Norma MRP | <<locked>> | 80% | 38,899 psi | 61% | 2461 fps | 98.7% |
| Norma URP | <<locked>> | 80% | 48,182 psi | 76% | 2536 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 34,925 psi | 55% | 2369 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 47,079 psi | 74% | 2539 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 31,111 psi | 49% | 2260 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,747 psi | 45% | 1503 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,269 psi | 77% | 2572 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,398 psi | 74% | 2592 fps | 100% |
| ReloadSwiss RS 76 | 68.2 gr | 80% | 29,109 psi | 46% | 2270 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 40,335 psi | 63% | 2530 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 42,322 psi | 66% | 2425 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 80% | 40,524 psi | 64% | 2428 fps | 98% |
| Rottweil R 907 | <<locked>> | 80% | 51,430 psi | 81% | 2549 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,343 psi | 79% | 2523 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,762 psi | 76% | 2520 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,226 psi | 77% | 2480 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,190 psi | 63% | 2425 fps | 98% |
| Somchem S361 | <<locked>> | 80% | 42,931 psi | 67% | 2415 fps | 96.7% |
| Somchem S365 | <<locked>> | 80% | 45,556 psi | 71% | 2497 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,075 psi | 64% | 2411 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 80% | 53,505 psi | 84% | 2516 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,661 psi | 78% | 2530 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,679 psi | 56% | 2300 fps | 97.1% |
| Vihtavuori N550 | <<locked>> | 80% | 48,979 psi | 77% | 2536 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,089 psi | 63% | 2421 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 38,943 psi | 61% | 2448 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 84% | 36,666 psi | 57% | 2392 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 92% | 41,843 psi | 66% | 2546 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 98% | 48,704 psi | 76% | 2707 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,631 psi | 76% | 2490 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,952 psi | 80% | 2602 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,169 psi | 50% | 2388 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,623 psi | 59% | 2346 fps | 97.1% |
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 78 powders for .300 Weath. Mag. loaded with the .308 | 220gr | Nosler Partition. Hodgdon Retumbo delivers the highest muzzle velocity at 2,825 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,825 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 1:13.0 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. Accurate 4350, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .300 Weath. Mag. with the .308 | 220gr | Nosler Partition 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.