Load Specifications
Load data in caliber .340 Weath. Mag. with .338 | 250gr | Nosler Partition RN bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Vihtavuori N560.
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 2495 | <<locked>> | 82% | 57,174 psi | 90% | 2569 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,418 psi | 85% | 2598 fps | 99.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,362 psi | 88% | 2703 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 57,638 psi | 90% | 2625 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,781 psi | 86% | 2694 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 54,694 psi | 86% | 2795 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 86% | 57,435 psi | 90% | 2661 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,709 psi | 87% | 2743 fps | 99.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,898 psi | 89% | 2795 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,521 psi | 57% | 2484 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,072 psi | 89% | 2782 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,911 psi | 86% | 2635 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,100 psi | 86% | 2654 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,535 psi | 87% | 2743 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,898 psi | 89% | 2762 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,056 psi | 86% | 2733 fps | 99.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,014 psi | 88% | 2792 fps | 99.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,127 psi | 83% | 2717 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,035 psi | 72% | 2664 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 98% | 56,942 psi | 89% | 2854 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,242 psi | 80% | 2720 fps | 98.9% |
| Bofors RP3 | <<locked>> | 84% | 55,680 psi | 87% | 2651 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 41,858 psi | 66% | 2592 fps | 96.5% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,014 psi | 88% | 2792 fps | 99.5% |
| Bofors RP7 | <<locked>> | 88% | 54,940 psi | 86% | 2644 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,600 psi | 71% | 2605 fps | 97.4% |
| Hodgdon H380 | <<locked>> | 84% | 56,072 psi | 88% | 2671 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 56,826 psi | 89% | 2746 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 56,550 psi | 89% | 2703 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 98% | 57,145 psi | 90% | 2740 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,985 psi | 88% | 2723 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,941 psi | 88% | 2667 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,305 psi | 90% | 2697 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,933 psi | 70% | 2703 fps | 98.7% |
| Hodgdon Superformance | <<locked>> | 90% | 57,087 psi | 89% | 2785 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,579 psi | 57% | 1627 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,682 psi | 90% | 2657 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,898 psi | 89% | 2641 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,811 psi | 87% | 2631 fps | 99.9% |
| IMR 4350 | <<locked>> | 92% | 55,854 psi | 88% | 2677 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,623 psi | 89% | 2671 fps | 99.9% |
| IMR 4831 | <<locked>> | 92% | 55,288 psi | 87% | 2684 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,536 psi | 89% | 2680 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,100 psi | 86% | 2674 fps | 98% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,389 psi | 85% | 2772 fps | 98.5% |
| Lovex S062 | <<locked>> | 84% | 57,043 psi | 89% | 2631 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,623 psi | 89% | 2661 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 54,563 psi | 86% | 2661 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,920 psi | 74% | 2569 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 54,389 psi | 85% | 2641 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,840 psi | 89% | 2733 fps | 99.3% |
| Norma MRP | <<locked>> | 98% | 55,550 psi | 87% | 2815 fps | 99.9% |
| Norma URP | <<locked>> | 92% | 56,971 psi | 89% | 2726 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,042 psi | 86% | 2667 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,737 psi | 86% | 2789 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 92% | 55,825 psi | 87% | 2736 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,892 psi | 77% | 2671 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,434 psi | 59% | 1670 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,782 psi | 87% | 2657 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,391 psi | 88% | 2753 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,621 psi | 86% | 2717 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,753 psi | 89% | 2795 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 44,976 psi | 70% | 2703 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 82% | 55,680 psi | 87% | 2598 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,738 psi | 87% | 2644 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,319 psi | 90% | 2713 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 96% | 54,317 psi | 85% | 2720 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 88% | 54,940 psi | 86% | 2644 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,623 psi | 89% | 2661 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,043 psi | 89% | 2631 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,563 psi | 86% | 2661 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,421 psi | 90% | 2707 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,550 psi | 89% | 2526 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,405 psi | 88% | 2621 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,493 psi | 90% | 2766 fps | 99.6% |
| Somchem S355 | <<locked>> | 86% | 55,753 psi | 87% | 2641 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,274 psi | 87% | 2657 fps | 97.8% |
| Somchem S365 | <<locked>> | 94% | 56,521 psi | 89% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,868 psi | 86% | 2694 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 56,231 psi | 88% | 2552 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,101 psi | 88% | 2569 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,884 psi | 89% | 2615 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,506 psi | 87% | 2671 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,128 psi | 85% | 2671 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 82% | 54,302 psi | 85% | 2569 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,607 psi | 86% | 2677 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,521 psi | 87% | 2736 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,724 psi | 87% | 2808 fps | 98.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,732 psi | 75% | 2671 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,027 psi | 86% | 2638 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,043 psi | 89% | 2746 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,196 psi | 76% | 2782 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,882 psi | 86% | 2690 fps | 99.2% |
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 2495 | <<locked>> | 80% | 53,606 psi | 84% | 2523 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,140 psi | 80% | 2552 fps | 99.2% |
| Accurate 3100 | <<locked>> | 80% | 28,732 psi | 45% | 2201 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 50,821 psi | 80% | 2536 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,030 psi | 61% | 2438 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 92% | 44,222 psi | 69% | 2621 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 47,688 psi | 75% | 2520 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 37,710 psi | 59% | 2425 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 90% | 40,872 psi | 64% | 2516 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 96% | 32,343 psi | 51% | 2375 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,243 psi | 83% | 2730 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,457 psi | 76% | 2543 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,561 psi | 81% | 2605 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,956 psi | 59% | 2451 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,018 psi | 67% | 2559 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 37,550 psi | 59% | 2421 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 35,346 psi | 55% | 2418 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,862 psi | 44% | 2234 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 27,804 psi | 44% | 2241 fps | 95.1% |
| Alliant Reloder-26 | 69.5 gr | 80% | 29,762 psi | 47% | 2343 fps | 97.2% |
| Bofors RP15 | <<locked>> | 90% | 37,202 psi | 58% | 2461 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 48,776 psi | 76% | 2556 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 39,233 psi | 61% | 2539 fps | 95.6% |
| Bofors RP5 | <<locked>> | 86% | 35,346 psi | 55% | 2418 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 42,989 psi | 67% | 2451 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 96% | 39,871 psi | 62% | 2493 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 49,226 psi | 77% | 2572 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 40,901 psi | 64% | 2484 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 43,729 psi | 69% | 2497 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 90% | 43,685 psi | 68% | 2523 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 90% | 42,815 psi | 67% | 2510 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,462 psi | 56% | 2346 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,621 psi | 84% | 2648 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 34,853 psi | 55% | 2470 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 39,842 psi | 62% | 2500 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,427 psi | 43% | 1453 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,215 psi | 85% | 2612 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,183 psi | 79% | 2549 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,489 psi | 82% | 2582 fps | 99.7% |
| IMR 4350 | <<locked>> | 80% | 38,508 psi | 60% | 2385 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,295 psi | 69% | 2474 fps | 98.7% |
| IMR 4831 | <<locked>> | 80% | 37,478 psi | 59% | 2395 fps | 99.4% |
| IMR 4895 | <<locked>> | 80% | 52,910 psi | 83% | 2631 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 42,888 psi | 67% | 2470 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 41,771 psi | 65% | 2549 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 50,575 psi | 79% | 2543 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,771 psi | 65% | 2428 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 39,987 psi | 63% | 2415 fps | 98.1% |
| Lovex S071 | <<locked>> | 84% | 28,268 psi | 44% | 2188 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 50,923 psi | 80% | 2592 fps | 100% |
| Norma 204 | <<locked>> | 80% | 38,029 psi | 60% | 2411 fps | 95.6% |
| Norma MRP | 69.1 gr | 82% | 32,111 psi | 50% | 2369 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 38,682 psi | 61% | 2431 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 51,547 psi | 81% | 2621 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 41,278 psi | 65% | 2552 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 37,594 psi | 59% | 2428 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 90% | 34,287 psi | 54% | 2385 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,949 psi | 44% | 1490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,950 psi | 77% | 2556 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,672 psi | 72% | 2602 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,740 psi | 61% | 2457 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,550 psi | 59% | 2470 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,055 psi | 53% | 2454 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 52,315 psi | 82% | 2552 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,006 psi | 72% | 2507 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 41,742 psi | 65% | 2457 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 84% | 36,651 psi | 57% | 2405 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 42,989 psi | 67% | 2451 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,771 psi | 65% | 2428 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 50,575 psi | 79% | 2543 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,987 psi | 63% | 2415 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,268 psi | 74% | 2562 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,079 psi | 74% | 2405 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,930 psi | 64% | 2379 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 36,303 psi | 57% | 2402 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 46,209 psi | 72% | 2503 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 45,353 psi | 71% | 2500 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 35,288 psi | 55% | 2395 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 32,605 psi | 51% | 2287 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 52,692 psi | 83% | 2510 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,736 psi | 83% | 2526 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,135 psi | 69% | 2438 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,089 psi | 63% | 2428 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 34,301 psi | 54% | 2323 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 51,111 psi | 80% | 2526 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,653 psi | 62% | 2434 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 30,951 psi | 49% | 2303 fps | 98.4% |
| Vihtavuori N560 | 75.9 gr | 90% | 42,670 psi | 67% | 2585 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 96% | 41,684 psi | 65% | 2562 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,175 psi | 61% | 2402 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,031 psi | 64% | 2487 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,685 psi | 39% | 2224 fps | 98.1% |
| Winchester Supreme 780 | <<locked>> | 86% | 36,419 psi | 57% | 2372 fps | 95.2% |
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 99 powders for .340 Weath. Mag. loaded with the .338 | 250gr | Nosler Partition RN. Alliant Reloder-26 delivers the highest muzzle velocity at 2,854 fps; across all powders the maximum-charge window runs from 1,627 fps to 2,854 fps. Accurate 3100 gives the best case fill at 100 %, and 99 of the 99 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 50–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2217 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for .340 Weath. Mag. with the .338 | 250gr | Nosler Partition RN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, Norma 217, ReloadSwiss RS 80 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.