Load Specifications
Load data in caliber .300 Weath. Mag. with .308 | 220gr | Sako Hammerhead bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and Winchester StaBALL HD.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 55,622 psi | 87% | 2638 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,739 psi | 89% | 2654 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 54,128 psi | 85% | 2730 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 90% | 57,421 psi | 90% | 2717 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 55,288 psi | 87% | 2730 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,127 psi | 83% | 2697 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,587 psi | 75% | 2664 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 57,595 psi | 90% | 2713 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,682 psi | 90% | 2703 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,913 psi | 89% | 2707 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,492 psi | 87% | 2723 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,000 psi | 89% | 2690 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,478 psi | 89% | 2756 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,580 psi | 90% | 2779 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 49,501 psi | 78% | 2710 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,550 psi | 89% | 2694 fps | 97.7% |
| Bofors RP15 | <<locked>> | 94% | 54,694 psi | 86% | 2710 fps | 99.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,115 psi | 88% | 2762 fps | 99.8% |
| Bofors RP5 | <<locked>> | 92% | 55,492 psi | 87% | 2723 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 54,969 psi | 86% | 2605 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 54,621 psi | 86% | 2720 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 54,491 psi | 85% | 2654 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,913 psi | 89% | 2667 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 55,143 psi | 86% | 2671 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,667 psi | 90% | 2707 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,418 psi | 85% | 2585 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,245 psi | 87% | 2828 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,781 psi | 86% | 2694 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,318 psi | 58% | 1647 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,652 psi | 89% | 2644 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,463 psi | 88% | 2625 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,058 psi | 89% | 2648 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,883 psi | 88% | 2651 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 94% | 57,072 psi | 89% | 2762 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,120 psi | 68% | 2575 fps | 98% |
| Lovex S065 | <<locked>> | 84% | 57,261 psi | 90% | 2625 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,492 psi | 87% | 2625 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,797 psi | 89% | 2651 fps | 100% |
| Norma 204 | <<locked>> | 84% | 54,128 psi | 85% | 2648 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 43,598 psi | 68% | 2605 fps | 99.6% |
| Norma MRP | <<locked>> | 90% | 55,361 psi | 87% | 2743 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,100 psi | 86% | 2638 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 53,911 psi | 84% | 2730 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 86% | 57,624 psi | 90% | 2700 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,260 psi | 88% | 2720 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,348 psi | 60% | 1686 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,739 psi | 89% | 2680 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,129 psi | 86% | 2707 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,753 psi | 87% | 2825 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,781 psi | 86% | 2785 fps | 99% |
| Rottweil R 904 | <<locked>> | 88% | 54,810 psi | 86% | 2638 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 90% | 56,710 psi | 89% | 2700 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 54,969 psi | 86% | 2605 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,261 psi | 90% | 2625 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,492 psi | 87% | 2625 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,333 psi | 88% | 2582 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,289 psi | 88% | 2697 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 56,217 psi | 88% | 2635 fps | 99.1% |
| Somchem S365 | <<locked>> | 86% | 55,767 psi | 87% | 2641 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,029 psi | 89% | 2671 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,188 psi | 90% | 2562 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,710 psi | 89% | 2631 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,608 psi | 89% | 2657 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 55,927 psi | 88% | 2638 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,579 psi | 87% | 2667 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,056 psi | 86% | 2740 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 96% | 55,245 psi | 87% | 2726 fps | 99.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,898 psi | 88% | 2789 fps | 98.7% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 52,678 psi | 83% | 2779 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,014 psi | 88% | 2589 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,723 psi | 86% | 2661 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,230 psi | 87% | 2769 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,913 psi | 89% | 2671 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% | 37,289 psi | 58% | 2336 fps | 99.1% |
| Accurate 4350 | <<locked>> | 80% | 49,588 psi | 78% | 2556 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 41,060 psi | 64% | 2497 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 41,336 psi | 65% | 2454 fps | 98.1% |
| ADI AR 2213 | <<locked>> | 80% | 36,840 psi | 58% | 2388 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 88% | 35,810 psi | 56% | 2365 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 84% | 28,442 psi | 45% | 2221 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,655 psi | 65% | 2451 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,616 psi | 75% | 2562 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,278 psi | 65% | 2444 fps | 98.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,159 psi | 58% | 2398 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,056 psi | 56% | 2359 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,154 psi | 49% | 2287 fps | 98.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,668 psi | 62% | 2497 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 46,064 psi | 72% | 2648 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 46,934 psi | 74% | 2533 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 34,606 psi | 54% | 2339 fps | 96.1% |
| Bofors RP30 | <<locked>> | 86% | 34,940 psi | 55% | 2379 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 37,159 psi | 58% | 2398 fps | 97.1% |
| Bofors RP7 | <<locked>> | 80% | 51,808 psi | 81% | 2556 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 34,098 psi | 53% | 2329 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 51,111 psi | 80% | 2605 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 53,432 psi | 84% | 2615 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 39,262 psi | 62% | 2392 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 38,609 psi | 61% | 2379 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,918 psi | 70% | 2451 fps | 100% |
| Hodgdon Retumbo | 65.7 gr | 82% | 32,474 psi | 51% | 2365 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 51,053 psi | 80% | 2638 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,079 psi | 44% | 1470 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,108 psi | 74% | 2497 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,040 psi | 83% | 2575 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,050 psi | 74% | 2503 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,930 psi | 64% | 2395 fps | 96.4% |
| IMR 7828 SSC | <<locked>> | 80% | 35,563 psi | 56% | 2369 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 94% | 35,520 psi | 56% | 2415 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 50,720 psi | 79% | 2530 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,950 psi | 77% | 2526 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 32,285 psi | 51% | 2224 fps | 97.9% |
| Norma 204 | <<locked>> | 80% | 47,297 psi | 74% | 2539 fps | 99% |
| Norma 217 | <<locked>> | 90% | 31,125 psi | 49% | 2326 fps | 96% |
| Norma MRP | <<locked>> | 80% | 39,044 psi | 61% | 2464 fps | 98.8% |
| Norma URP | <<locked>> | 80% | 48,356 psi | 76% | 2539 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 35,215 psi | 55% | 2375 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 47,239 psi | 74% | 2546 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 31,372 psi | 49% | 2267 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,747 psi | 45% | 1506 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,632 psi | 78% | 2579 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,805 psi | 75% | 2598 fps | 100% |
| ReloadSwiss RS 76 | 68.6 gr | 80% | 29,356 psi | 46% | 2277 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 40,596 psi | 64% | 2536 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 42,482 psi | 67% | 2431 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 80% | 40,872 psi | 64% | 2438 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 80% | 51,808 psi | 81% | 2556 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,720 psi | 79% | 2530 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,950 psi | 77% | 2526 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,559 psi | 78% | 2487 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,538 psi | 64% | 2431 fps | 98% |
| Somchem S361 | <<locked>> | 80% | 43,221 psi | 68% | 2421 fps | 96.8% |
| Somchem S365 | <<locked>> | 80% | 45,774 psi | 72% | 2500 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,234 psi | 65% | 2418 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 80% | 53,664 psi | 84% | 2516 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,806 psi | 78% | 2533 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,810 psi | 56% | 2303 fps | 97.2% |
| Vihtavuori N550 | <<locked>> | 80% | 49,124 psi | 77% | 2539 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,292 psi | 63% | 2428 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 39,073 psi | 61% | 2454 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 84% | 36,811 psi | 58% | 2395 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 92% | 42,134 psi | 66% | 2552 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 98% | 49,211 psi | 77% | 2720 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,950 psi | 77% | 2493 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,329 psi | 80% | 2608 fps | 100% |
| Winchester StaBALL HD | 65.8 gr | 80% | 32,401 psi | 51% | 2392 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,782 psi | 59% | 2352 fps | 97.2% |
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 73 powders for .300 Weath. Mag. loaded with the .308 | 220gr | Sako Hammerhead. Hodgdon Retumbo delivers the highest muzzle velocity at 2,828 fps; across all powders the maximum-charge window runs from 1,647 fps to 2,828 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 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 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 2225, Alliant Reloder-33 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. Hodgdon Retumbo, ReloadSwiss RS 76, Winchester StaBALL HD rank at the top here: for .300 Weath. Mag. with the .308 | 220gr | Sako Hammerhead 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.