Load Specifications
Load data in caliber .340 Weath. Mag. with .338 | 250gr | RWS Speed Tip Professional bullet and 105 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 and Hodgdon Superformance.
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>> | 84% | 57,043 psi | 89% | 2546 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,911 psi | 86% | 2579 fps | 99.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,793 psi | 81% | 2618 fps | 99.8% |
| Accurate 4064 | <<locked>> | 86% | 57,392 psi | 90% | 2602 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,375 psi | 85% | 2664 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 53,708 psi | 84% | 2756 fps | 97% |
| ADI AR 2206H | <<locked>> | 82% | 56,420 psi | 88% | 2628 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 57,551 psi | 90% | 2635 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,230 psi | 87% | 2707 fps | 99% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 52,808 psi | 83% | 2703 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,029 psi | 89% | 2759 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,882 psi | 86% | 2612 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,071 psi | 86% | 2631 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,013 psi | 86% | 2713 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,391 psi | 88% | 2740 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,476 psi | 85% | 2697 fps | 98.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,474 psi | 81% | 2700 fps | 98.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,747 psi | 76% | 2638 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,453 psi | 67% | 2575 fps | 99.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,767 psi | 87% | 2822 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,289 psi | 88% | 2651 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,297 psi | 74% | 2631 fps | 97.9% |
| Bofors RP3 | <<locked>> | 86% | 55,521 psi | 87% | 2625 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,474 psi | 81% | 2700 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 55,071 psi | 86% | 2618 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 86% | 55,941 psi | 88% | 2644 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 56,579 psi | 89% | 2717 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 90% | 56,478 psi | 89% | 2674 fps | 99.3% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 56,637 psi | 89% | 2703 fps | 97.6% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 55,419 psi | 87% | 2684 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 82% | 57,043 psi | 89% | 2638 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,259 psi | 87% | 2638 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,450 psi | 90% | 2677 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 41,539 psi | 65% | 2602 fps | 97.2% |
| Hodgdon Superformance | <<locked>> | 92% | 56,652 psi | 89% | 2756 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,303 psi | 57% | 1594 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,578 psi | 86% | 2592 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,014 psi | 89% | 2618 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,202 psi | 88% | 2608 fps | 99.7% |
| IMR 4350 | <<locked>> | 94% | 55,825 psi | 87% | 2651 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,608 psi | 89% | 2641 fps | 99.7% |
| IMR 4831 | <<locked>> | 94% | 54,708 psi | 86% | 2654 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 56,463 psi | 88% | 2657 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,795 psi | 86% | 2641 fps | 97.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 50,227 psi | 79% | 2677 fps | 97.2% |
| Lovex D073.6 | <<locked>> | 82% | 56,927 psi | 89% | 2602 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,259 psi | 87% | 2556 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,305 psi | 90% | 2612 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,739 psi | 89% | 2638 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 54,462 psi | 85% | 2631 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,105 psi | 68% | 2487 fps | 99% |
| Norma 201 | <<locked>> | 82% | 55,259 psi | 87% | 2575 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,854 psi | 88% | 2569 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,360 psi | 85% | 2618 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,565 psi | 89% | 2703 fps | 99% |
| Norma MRPᴾ | <<locked>> | 100% | 54,621 psi | 86% | 2779 fps | 99.8% |
| Norma URP | <<locked>> | 94% | 56,608 psi | 89% | 2697 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,100 psi | 86% | 2648 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 50,343 psi | 79% | 2687 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 94% | 55,317 psi | 87% | 2703 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,846 psi | 70% | 2575 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,985 psi | 58% | 1634 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,840 psi | 88% | 2631 fps | 99.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,014 psi | 88% | 2697 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,912 psi | 88% | 2726 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,012 psi | 85% | 2687 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,275 psi | 88% | 2766 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,350 psi | 65% | 2598 fps | 98.2% |
| Rottweil R 902 | <<locked>> | 84% | 55,767 psi | 87% | 2572 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,579 psi | 87% | 2621 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,898 psi | 89% | 2677 fps | 98.3% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 57,188 psi | 90% | 2733 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 90% | 55,071 psi | 86% | 2618 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,739 psi | 89% | 2638 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,927 psi | 89% | 2602 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,305 psi | 90% | 2612 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,462 psi | 85% | 2631 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,159 psi | 90% | 2680 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 57,667 psi | 90% | 2641 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,766 psi | 86% | 2605 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,985 psi | 88% | 2503 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,797 psi | 89% | 2507 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,449 psi | 88% | 2595 fps | 99.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,681 psi | 89% | 2730 fps | 99.2% |
| Somchem S335 | <<locked>> | 82% | 55,825 psi | 87% | 2507 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,261 psi | 90% | 2621 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,637 psi | 87% | 2618 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,143 psi | 86% | 2625 fps | 97.3% |
| Somchem S365 | <<locked>> | 96% | 55,709 psi | 87% | 2697 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,317 psi | 85% | 2661 fps | 99.4% |
| Vihtavuori N133 | <<locked>> | 82% | 56,507 psi | 89% | 2484 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,275 psi | 88% | 2533 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,347 psi | 88% | 2549 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,898 psi | 89% | 2592 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,332 psi | 87% | 2644 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,067 psi | 78% | 2585 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 84% | 54,534 psi | 85% | 2552 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,375 psi | 85% | 2651 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,418 psi | 85% | 2703 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,100 psi | 86% | 2769 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,839 psi | 86% | 2615 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,811 psi | 89% | 2720 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,874 psi | 69% | 2697 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,998 psi | 86% | 2615 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,360 psi | 85% | 2654 fps | 98.8% |
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% | 50,372 psi | 79% | 2464 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,124 psi | 75% | 2477 fps | 98.4% |
| Accurate 3100 | <<locked>> | 84% | 30,240 psi | 47% | 2224 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 47,732 psi | 75% | 2474 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,100 psi | 57% | 2365 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 96% | 46,731 psi | 73% | 2641 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 53,055 psi | 83% | 2585 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,063 psi | 71% | 2454 fps | 100% |
| ADI AR 2209 | <<locked>> | 88% | 40,089 psi | 63% | 2451 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 94% | 43,294 psi | 68% | 2536 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,414 psi | 77% | 2651 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,484 psi | 71% | 2477 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,588 psi | 76% | 2539 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,375 psi | 55% | 2372 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,972 psi | 63% | 2487 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 37,217 psi | 58% | 2392 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 90% | 37,188 psi | 58% | 2438 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,947 psi | 41% | 2159 fps | 97.2% |
| Alliant Reloder-25 | <<locked>> | 88% | 29,312 psi | 46% | 2264 fps | 95.3% |
| Alliant Reloder-26 | 64.9 gr | 80% | 27,354 psi | 43% | 2254 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,721 psi | 83% | 2602 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 39,102 psi | 61% | 2477 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 45,788 psi | 72% | 2487 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 37,188 psi | 58% | 2438 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 40,422 psi | 63% | 2375 fps | 97.1% |
| Hodgdon H380 | <<locked>> | 80% | 46,079 psi | 72% | 2500 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 38,130 psi | 60% | 2408 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 80% | 41,176 psi | 65% | 2425 fps | 96.6% |
| Hodgdon H4831 | <<locked>> | 94% | 46,383 psi | 73% | 2543 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 45,426 psi | 71% | 2530 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 53,635 psi | 84% | 2592 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,909 psi | 52% | 2274 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,212 psi | 79% | 2579 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 36,695 psi | 57% | 2490 fps | 95.2% |
| Hodgdon Superformance | 67 gr | 80% | 36,999 psi | 58% | 2418 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,267 psi | 43% | 1427 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,271 psi | 80% | 2546 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,384 psi | 74% | 2480 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,705 psi | 78% | 2513 fps | 99.2% |
| IMR 4350 | <<locked>> | 80% | 36,143 psi | 57% | 2313 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,800 psi | 66% | 2402 fps | 97.8% |
| IMR 4831 | <<locked>> | 80% | 34,780 psi | 55% | 2323 fps | 98.7% |
| IMR 4895 | <<locked>> | 80% | 49,821 psi | 78% | 2562 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 45,542 psi | 71% | 2493 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 96% | 44,121 psi | 69% | 2566 fps | 95.6% |
| Lovex D073.6 | <<locked>> | 80% | 53,185 psi | 83% | 2556 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,199 psi | 82% | 2513 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,747 psi | 75% | 2480 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,334 psi | 62% | 2359 fps | 98.5% |
| Lovex S070 | <<locked>> | 80% | 37,507 psi | 59% | 2343 fps | 97.1% |
| Lovex S071 | <<locked>> | 88% | 29,428 psi | 46% | 2205 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 51,938 psi | 81% | 2533 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,475 psi | 82% | 2526 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,935 psi | 75% | 2526 fps | 100% |
| Norma 204 | <<locked>> | 82% | 37,782 psi | 59% | 2385 fps | 95% |
| Norma MRP | <<locked>> | 86% | 34,040 psi | 53% | 2398 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 35,955 psi | 56% | 2359 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 80% | 47,979 psi | 75% | 2546 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 43,830 psi | 69% | 2572 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 34,940 psi | 55% | 2349 fps | 97.1% |
| Ramshot Magnum | <<locked>> | 94% | 36,230 psi | 57% | 2405 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,601 psi | 43% | 1457 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,093 psi | 72% | 2484 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,475 psi | 82% | 2648 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,496 psi | 67% | 2533 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,795 psi | 56% | 2382 fps | 98.6% |
| ReloadSwiss RS 70 | 64.3 gr | 80% | 34,838 psi | 55% | 2388 fps | 98.1% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 33,663 psi | 53% | 2415 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 49,385 psi | 77% | 2487 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,975 psi | 67% | 2438 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 41,611 psi | 65% | 2431 fps | 95% |
| Rottweil R 905 | <<locked>> | 88% | 38,580 psi | 60% | 2425 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 40,422 psi | 63% | 2375 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,334 psi | 62% | 2359 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,185 psi | 83% | 2556 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,747 psi | 75% | 2480 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,507 psi | 59% | 2343 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,121 psi | 69% | 2490 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,940 psi | 85% | 2589 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,517 psi | 81% | 2559 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,736 psi | 83% | 2464 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,527 psi | 70% | 2349 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,435 psi | 60% | 2306 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 38,203 psi | 60% | 2421 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 52,533 psi | 82% | 2464 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,621 psi | 84% | 2575 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,468 psi | 68% | 2438 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 45,339 psi | 71% | 2470 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 32,561 psi | 51% | 2323 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 34,505 psi | 54% | 2313 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 53,287 psi | 84% | 2444 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,617 psi | 78% | 2451 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,734 psi | 78% | 2464 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,365 psi | 65% | 2372 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,434 psi | 59% | 2356 fps | 99% |
| Vihtavuori N165 | <<locked>> | 90% | 36,260 psi | 57% | 2343 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 48,037 psi | 75% | 2464 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,854 psi | 58% | 2359 fps | 98.8% |
| Vihtavuori N555 | <<locked>> | 80% | 28,326 psi | 44% | 2224 fps | 97.3% |
| Vihtavuori N560 | <<locked>> | 94% | 45,107 psi | 71% | 2605 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,535 psi | 57% | 2329 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 38,130 psi | 60% | 2408 fps | 97.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 22,872 psi | 36% | 2133 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,459 psi | 81% | 2566 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 38,609 psi | 61% | 2395 fps | 95.4% |
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 112 powders for .340 Weath. Mag. loaded with the .338 | 250gr | RWS Speed Tip Professional. Alliant Reloder-26 delivers the highest muzzle velocity at 2,822 fps; across all powders the maximum-charge window runs from 1,594 fps to 2,822 fps. Accurate 3100 gives the best case fill at 100 %, and 112 of the 112 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 46–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .340 Weath. Mag. with the .338 | 250gr | RWS Speed Tip Professional they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, Baschieri & Pellagri 109, Bofors RP30 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.