Load Specifications
Load data in caliber .340 Weath. Mag. with .338 | 250gr | Swift A-Frame bullet and 92 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.
A valid access license is required to use the Personalized Load Calculator.
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% | 57,276 psi | 90% | 2569 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,462 psi | 85% | 2602 fps | 99.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,434 psi | 88% | 2703 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 57,725 psi | 90% | 2625 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,882 psi | 86% | 2694 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 54,752 psi | 86% | 2799 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 86% | 57,319 psi | 90% | 2657 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,796 psi | 87% | 2746 fps | 99.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,971 psi | 89% | 2799 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,724 psi | 58% | 2487 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,174 psi | 90% | 2785 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,027 psi | 86% | 2635 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,984 psi | 86% | 2654 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,637 psi | 87% | 2743 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 57,000 psi | 89% | 2766 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,129 psi | 86% | 2733 fps | 99.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 56,086 psi | 88% | 2792 fps | 99.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,200 psi | 83% | 2717 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,093 psi | 72% | 2667 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,014 psi | 89% | 2854 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 2720 fps | 98.9% |
| Bofors RP3 | <<locked>> | 84% | 55,796 psi | 87% | 2651 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 41,916 psi | 66% | 2592 fps | 96.5% |
| Bofors RP5ᴾ | <<locked>> | 100% | 56,086 psi | 88% | 2792 fps | 99.5% |
| Bofors RP7 | <<locked>> | 88% | 55,042 psi | 86% | 2648 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,658 psi | 72% | 2608 fps | 97.4% |
| Hodgdon H380 | <<locked>> | 84% | 55,941 psi | 88% | 2671 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 56,913 psi | 89% | 2746 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 56,637 psi | 89% | 2707 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 98% | 57,217 psi | 90% | 2743 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 56,043 psi | 88% | 2726 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,043 psi | 88% | 2667 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,406 psi | 90% | 2697 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,179 psi | 71% | 2710 fps | 98.7% |
| Hodgdon Superformance | <<locked>> | 90% | 57,159 psi | 90% | 2785 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,709 psi | 58% | 1631 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,000 psi | 89% | 2644 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,898 psi | 88% | 2631 fps | 99.9% |
| IMR 4350 | <<locked>> | 92% | 55,941 psi | 88% | 2680 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,710 psi | 89% | 2671 fps | 99.9% |
| IMR 4831 | <<locked>> | 92% | 55,376 psi | 87% | 2687 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,420 psi | 88% | 2677 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,172 psi | 86% | 2677 fps | 98% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,462 psi | 85% | 2772 fps | 98.5% |
| Lovex S062 | <<locked>> | 84% | 57,145 psi | 90% | 2631 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,724 psi | 89% | 2664 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 54,665 psi | 86% | 2661 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,007 psi | 74% | 2569 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 54,288 psi | 85% | 2641 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,913 psi | 89% | 2736 fps | 99.3% |
| Norma MRP | <<locked>> | 98% | 55,622 psi | 87% | 2815 fps | 99.9% |
| Norma URP | <<locked>> | 92% | 57,058 psi | 89% | 2726 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,129 psi | 86% | 2671 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,795 psi | 86% | 2789 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 92% | 55,912 psi | 88% | 2736 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 48,936 psi | 77% | 2671 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,376 psi | 59% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,869 psi | 88% | 2657 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,492 psi | 89% | 2753 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,708 psi | 86% | 2720 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,826 psi | 89% | 2799 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,005 psi | 71% | 2703 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 82% | 55,796 psi | 87% | 2598 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,854 psi | 88% | 2648 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,392 psi | 90% | 2713 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 96% | 54,404 psi | 85% | 2720 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 88% | 55,042 psi | 86% | 2648 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,724 psi | 89% | 2664 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,145 psi | 90% | 2631 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,665 psi | 86% | 2661 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,522 psi | 90% | 2707 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,608 psi | 89% | 2530 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,463 psi | 88% | 2625 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,580 psi | 90% | 2766 fps | 99.6% |
| Somchem S355 | <<locked>> | 86% | 55,854 psi | 88% | 2644 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,332 psi | 87% | 2657 fps | 97.8% |
| Somchem S365 | <<locked>> | 94% | 56,550 psi | 89% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,940 psi | 86% | 2694 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 56,086 psi | 88% | 2552 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,202 psi | 88% | 2569 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,956 psi | 89% | 2615 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,564 psi | 87% | 2671 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,201 psi | 85% | 2674 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 82% | 54,404 psi | 85% | 2572 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,694 psi | 86% | 2680 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,608 psi | 87% | 2740 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,796 psi | 87% | 2808 fps | 98.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,790 psi | 75% | 2671 fps | 97.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 55,100 psi | 86% | 2641 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 57,130 psi | 90% | 2749 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,501 psi | 76% | 2789 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,984 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% | 53,737 psi | 84% | 2526 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,039 psi | 80% | 2549 fps | 99.2% |
| Accurate 3100 | <<locked>> | 80% | 28,776 psi | 45% | 2205 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 50,952 psi | 80% | 2536 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,102 psi | 61% | 2441 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 92% | 44,280 psi | 69% | 2621 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 47,761 psi | 75% | 2523 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 37,782 psi | 59% | 2428 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 90% | 40,886 psi | 64% | 2520 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 96% | 32,401 psi | 51% | 2375 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,345 psi | 84% | 2730 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,559 psi | 76% | 2543 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,677 psi | 81% | 2608 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,869 psi | 59% | 2448 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,120 psi | 68% | 2562 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 37,623 psi | 59% | 2425 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 35,244 psi | 55% | 2418 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,905 psi | 44% | 2234 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 27,876 psi | 44% | 2244 fps | 95.1% |
| Alliant Reloder-26 | 69.6 gr | 80% | 29,791 psi | 47% | 2346 fps | 97.2% |
| Bofors RP15 | <<locked>> | 90% | 37,275 psi | 58% | 2461 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 48,892 psi | 77% | 2556 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 39,291 psi | 62% | 2539 fps | 95.7% |
| Bofors RP5 | <<locked>> | 86% | 35,244 psi | 55% | 2418 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 42,902 psi | 67% | 2448 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 96% | 39,929 psi | 63% | 2493 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 49,124 psi | 77% | 2572 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 40,988 psi | 64% | 2484 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 80% | 43,830 psi | 69% | 2500 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 90% | 43,758 psi | 69% | 2526 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 42,888 psi | 67% | 2510 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,534 psi | 56% | 2349 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,679 psi | 84% | 2648 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 34,882 psi | 55% | 2470 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 39,871 psi | 62% | 2500 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,383 psi | 43% | 1453 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,270 psi | 79% | 2549 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,562 psi | 82% | 2585 fps | 99.7% |
| IMR 4350 | <<locked>> | 80% | 38,595 psi | 60% | 2385 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,382 psi | 70% | 2477 fps | 98.7% |
| IMR 4831 | <<locked>> | 80% | 37,536 psi | 59% | 2395 fps | 99.4% |
| IMR 4895 | <<locked>> | 80% | 53,026 psi | 83% | 2631 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 42,931 psi | 67% | 2474 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 41,843 psi | 66% | 2549 fps | 95.6% |
| Lovex S062 | <<locked>> | 80% | 50,676 psi | 79% | 2546 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,843 psi | 66% | 2428 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 40,074 psi | 63% | 2415 fps | 98.2% |
| Lovex S071 | <<locked>> | 84% | 28,311 psi | 44% | 2192 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 51,039 psi | 80% | 2595 fps | 100% |
| Norma 204 | <<locked>> | 80% | 37,942 psi | 59% | 2411 fps | 95.6% |
| Norma MRP | 69.2 gr | 82% | 32,140 psi | 50% | 2369 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 38,783 psi | 61% | 2434 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 51,590 psi | 81% | 2621 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 41,336 psi | 65% | 2556 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 37,565 psi | 59% | 2428 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 90% | 34,345 psi | 54% | 2388 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,891 psi | 44% | 1490 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,052 psi | 77% | 2556 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,774 psi | 72% | 2605 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,841 psi | 61% | 2461 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,623 psi | 59% | 2474 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,098 psi | 53% | 2454 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 52,431 psi | 82% | 2552 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,108 psi | 72% | 2510 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 41,829 psi | 66% | 2461 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 84% | 36,550 psi | 57% | 2405 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 42,902 psi | 67% | 2448 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,843 psi | 66% | 2428 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 50,676 psi | 79% | 2546 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,074 psi | 63% | 2415 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,166 psi | 74% | 2559 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,181 psi | 74% | 2405 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,017 psi | 64% | 2379 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 36,230 psi | 57% | 2402 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 46,311 psi | 73% | 2507 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 45,426 psi | 71% | 2500 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 35,375 psi | 55% | 2398 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 32,663 psi | 51% | 2290 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 52,823 psi | 83% | 2513 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,852 psi | 83% | 2526 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,208 psi | 69% | 2438 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,161 psi | 63% | 2431 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 34,374 psi | 54% | 2323 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 50,995 psi | 80% | 2526 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,566 psi | 62% | 2434 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 31,009 psi | 49% | 2303 fps | 98.5% |
| Vihtavuori N560 | 76 gr | 90% | 42,685 psi | 67% | 2585 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 96% | 41,756 psi | 65% | 2562 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,247 psi | 62% | 2402 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,118 psi | 64% | 2487 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,642 psi | 39% | 2224 fps | 98% |
| Winchester Supreme 780 | <<locked>> | 86% | 36,492 psi | 57% | 2375 fps | 95.3% |
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 92 powders for .340 Weath. Mag. loaded with the .338 | 250gr | Swift A-Frame. Alliant Reloder-26 delivers the highest muzzle velocity at 2,854 fps; across all powders the maximum-charge window runs from 1,631 fps to 2,854 fps. Accurate 3100 gives the best case fill at 100 %, and 92 of the 92 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 1:15.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for .340 Weath. Mag. with the .338 | 250gr | Swift A-Frame 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.