Load Specifications
Load data in caliber .340 Weath. Mag. with .338 | 250gr | Sako Hammerhead bullet and 90 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 55,927 psi | 88% | 2635 fps | 99.7% |
| Accurate 3100 | <<locked>> | 98% | 54,578 psi | 86% | 2690 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,680 psi | 87% | 2608 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,811 psi | 89% | 2726 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 56,840 psi | 89% | 2838 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 84% | 55,303 psi | 87% | 2641 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,319 psi | 90% | 2776 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 98% | 54,926 psi | 86% | 2779 fps | 98.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 42,888 psi | 67% | 2566 fps | 96.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,956 psi | 59% | 2530 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,318 psi | 88% | 2664 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,507 psi | 89% | 2684 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 57,305 psi | 90% | 2776 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,071 psi | 86% | 2749 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,840 psi | 89% | 2769 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,273 psi | 85% | 2776 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,085 psi | 86% | 2749 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,776 psi | 75% | 2703 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,317 psi | 87% | 2841 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 57,392 psi | 90% | 2743 fps | 96.3% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,243 psi | 83% | 2759 fps | 99.3% |
| Bofors RP3 | <<locked>> | 84% | 57,290 psi | 90% | 2680 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,555 psi | 68% | 2635 fps | 97.2% |
| Bofors RP5 | <<locked>> | 98% | 54,273 psi | 85% | 2776 fps | 99.4% |
| Bofors RP7 | <<locked>> | 88% | 56,536 psi | 89% | 2680 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,137 psi | 74% | 2648 fps | 98% |
| Hodgdon H380 | <<locked>> | 84% | 57,537 psi | 90% | 2700 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 54,955 psi | 86% | 2730 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 86% | 54,520 psi | 85% | 2687 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 96% | 55,201 psi | 87% | 2723 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,711 psi | 90% | 2759 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,099 psi | 85% | 2654 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,746 psi | 73% | 2753 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 88% | 55,158 psi | 86% | 2769 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,796 psi | 58% | 1644 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 54,853 psi | 86% | 2625 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 57,232 psi | 90% | 2664 fps | 100% |
| IMR 4350 | <<locked>> | 92% | 57,493 psi | 90% | 2713 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,607 psi | 86% | 2654 fps | 99.8% |
| IMR 4831 | <<locked>> | 92% | 56,898 psi | 89% | 2713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,478 psi | 89% | 2710 fps | 98.4% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 56,275 psi | 88% | 2812 fps | 98.9% |
| Lovex S062 | <<locked>> | 82% | 55,259 psi | 87% | 2618 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,824 psi | 86% | 2648 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,318 psi | 88% | 2694 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,733 psi | 76% | 2605 fps | 99.9% |
| Norma 203B | <<locked>> | 82% | 55,825 psi | 87% | 2671 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,737 psi | 86% | 2717 fps | 99.2% |
| Norma MRP | <<locked>> | 96% | 54,085 psi | 85% | 2802 fps | 99.9% |
| Norma URP | <<locked>> | 90% | 55,317 psi | 87% | 2713 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,724 psi | 89% | 2700 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,884 psi | 89% | 2831 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 92% | 57,522 psi | 90% | 2766 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,792 psi | 80% | 2713 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,463 psi | 59% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,334 psi | 90% | 2690 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,433 psi | 85% | 2733 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,623 psi | 89% | 2753 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,882 psi | 86% | 2782 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,775 psi | 73% | 2749 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 82% | 57,145 psi | 90% | 2625 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,580 psi | 90% | 2677 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,405 psi | 87% | 2697 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 96% | 56,246 psi | 88% | 2756 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 88% | 56,536 psi | 89% | 2680 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,824 psi | 86% | 2648 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,259 psi | 87% | 2618 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,318 psi | 88% | 2694 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,448 psi | 87% | 2690 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,636 psi | 86% | 2513 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,404 psi | 85% | 2608 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,782 psi | 87% | 2753 fps | 99.5% |
| Somchem S355 | <<locked>> | 86% | 57,290 psi | 90% | 2674 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,971 psi | 89% | 2690 fps | 98.2% |
| Somchem S365 | <<locked>> | 92% | 54,868 psi | 86% | 2710 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,855 psi | 89% | 2733 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 82% | 57,653 psi | 90% | 2579 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,725 psi | 90% | 2595 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,056 psi | 86% | 2602 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,348 psi | 90% | 2703 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,028 psi | 88% | 2707 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 82% | 55,738 psi | 87% | 2598 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,318 psi | 88% | 2710 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 57,580 psi | 90% | 2772 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,186 psi | 85% | 2795 fps | 98.3% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,734 psi | 78% | 2713 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,811 psi | 89% | 2667 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 55,158 psi | 86% | 2730 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,966 psi | 80% | 2825 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,826 psi | 89% | 2726 fps | 99.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 80% | 52,301 psi | 82% | 2582 fps | 99.4% |
| Accurate 3100 | <<locked>> | 80% | 29,950 psi | 47% | 2238 fps | 96% |
| Accurate 4064 | <<locked>> | 80% | 52,417 psi | 82% | 2566 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,582 psi | 64% | 2477 fps | 99.8% |
| Accurate MAGPRO | 79.7 gr | 90% | 42,888 psi | 67% | 2605 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 49,037 psi | 77% | 2549 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 36,390 psi | 57% | 2405 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 90% | 42,206 psi | 66% | 2556 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 98% | 40,277 psi | 63% | 2510 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 94% | 31,430 psi | 49% | 2359 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,864 psi | 78% | 2572 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,185 psi | 83% | 2641 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,088 psi | 61% | 2480 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,527 psi | 70% | 2592 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 36,274 psi | 57% | 2405 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 86% | 36,477 psi | 57% | 2451 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,848 psi | 45% | 2267 fps | 98.9% |
| Alliant Reloder-25 | <<locked>> | 84% | 28,747 psi | 45% | 2280 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 30,835 psi | 48% | 2382 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 54,085 psi | 85% | 2690 fps | 95.6% |
| Bofors RP15 | <<locked>> | 88% | 36,172 psi | 57% | 2444 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 50,401 psi | 79% | 2585 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 38,218 psi | 60% | 2523 fps | 95.5% |
| Bofors RP5 | <<locked>> | 86% | 36,477 psi | 57% | 2451 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 44,005 psi | 69% | 2480 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 94% | 38,682 psi | 61% | 2480 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 50,575 psi | 79% | 2602 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,293 psi | 66% | 2520 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 80% | 45,121 psi | 71% | 2533 fps | 98.1% |
| Hodgdon H4831 | <<locked>> | 88% | 42,235 psi | 66% | 2507 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 44,280 psi | 69% | 2546 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,767 psi | 58% | 2379 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 33,924 psi | 53% | 2457 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 41,147 psi | 64% | 2536 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,557 psi | 43% | 1467 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,561 psi | 81% | 2579 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,708 psi | 84% | 2615 fps | 99.8% |
| IMR 4350 | <<locked>> | 80% | 39,639 psi | 62% | 2418 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,498 psi | 71% | 2507 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 38,754 psi | 61% | 2428 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 86% | 41,553 psi | 65% | 2457 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 90% | 40,408 psi | 63% | 2533 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 51,851 psi | 81% | 2572 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,004 psi | 67% | 2461 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 41,205 psi | 65% | 2448 fps | 98.5% |
| Lovex S071 | <<locked>> | 84% | 29,341 psi | 46% | 2221 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 52,547 psi | 82% | 2628 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,102 psi | 61% | 2444 fps | 96.2% |
| Norma MRP | 69.5 gr | 80% | 31,067 psi | 49% | 2349 fps | 95% |
| Norma URP | <<locked>> | 80% | 40,001 psi | 63% | 2464 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 80% | 52,997 psi | 83% | 2651 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 39,987 psi | 63% | 2536 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 38,769 psi | 61% | 2457 fps | 98.6% |
| Ramshot Magnum | <<locked>> | 88% | 33,112 psi | 52% | 2369 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,065 psi | 44% | 1503 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,343 psi | 79% | 2589 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,253 psi | 74% | 2635 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,161 psi | 63% | 2493 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,769 psi | 61% | 2507 fps | 99.4% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 33,011 psi | 52% | 2438 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 53,766 psi | 84% | 2582 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,442 psi | 74% | 2536 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 40,408 psi | 63% | 2441 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 82% | 35,447 psi | 56% | 2388 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 44,005 psi | 69% | 2480 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,004 psi | 67% | 2461 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 51,851 psi | 81% | 2572 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,205 psi | 65% | 2448 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,530 psi | 76% | 2592 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,269 psi | 76% | 2431 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,047 psi | 66% | 2411 fps | 98.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 35,114 psi | 55% | 2382 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 47,572 psi | 75% | 2533 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 43,830 psi | 69% | 2484 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 36,651 psi | 57% | 2428 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 33,808 psi | 53% | 2323 fps | 95.7% |
| Vihtavuori N135 | <<locked>> | 80% | 54,143 psi | 85% | 2536 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 54,172 psi | 85% | 2552 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,426 psi | 71% | 2467 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,524 psi | 65% | 2461 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 33,243 psi | 52% | 2306 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 52,373 psi | 82% | 2552 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 40,843 psi | 64% | 2464 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 32,068 psi | 50% | 2336 fps | 98.8% |
| Vihtavuori N560 | 76.5 gr | 88% | 41,307 psi | 65% | 2566 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 94% | 40,509 psi | 63% | 2546 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,306 psi | 63% | 2428 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,453 psi | 67% | 2523 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,469 psi | 40% | 2264 fps | 98.7% |
| Winchester Supreme 780 | <<locked>> | 84% | 35,201 psi | 55% | 2356 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 90 powders for .340 Weath. Mag. loaded with the .338 | 250gr | Sako Hammerhead. Alliant Reloder-26 delivers the highest muzzle velocity at 2,841 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,841 fps. ADI AR 2217 gives the best case fill at 100 %, and 90 of the 90 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 250.0 gr projectile in 0.338" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-23 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. Norma MRP, Vihtavuori N560, Accurate MAGPRO rank at the top here: for .340 Weath. Mag. with the .338 | 250gr | 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.