Load Specifications
Bullet Manufacturer:Barnes
Bullet Weight:250 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.340 Weath. Mag. load data
Case Length (l3):2.825"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:100 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:26"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:13.5
Load data in caliber .340 Weath. Mag. with .338 | 250gr | Barnes Banded Solid RN bullet and 100 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country and ReloadSwiss RS 70.
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% | 55,637 psi | 87% | 2539 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,637 psi | 89% | 2618 fps | 99.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,302 psi | 85% | 2667 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 55,956 psi | 88% | 2595 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,637 psi | 89% | 2707 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 55,535 psi | 87% | 2812 fps | 98.7% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 56,304 psi | 88% | 2808 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 86% | 55,854 psi | 88% | 2628 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,493 psi | 90% | 2756 fps | 99.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,940 psi | 86% | 2753 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 35,346 psi | 55% | 2441 fps | 96.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,288 psi | 87% | 2749 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 57,479 psi | 90% | 2753 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,739 psi | 89% | 2648 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,898 psi | 89% | 2671 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 57,392 psi | 90% | 2756 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,998 psi | 86% | 2730 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,652 psi | 89% | 2743 fps | 99.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,853 psi | 84% | 2749 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,010 psi | 80% | 2680 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,440 psi | 70% | 2625 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,549 psi | 85% | 2818 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,356 psi | 77% | 2680 fps | 98.5% |
| Bofors RP3 | <<locked>> | 86% | 57,595 psi | 90% | 2664 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,853 psi | 84% | 2749 fps | 99.2% |
| Bofors RP7 | <<locked>> | 90% | 56,811 psi | 89% | 2657 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 44,164 psi | 69% | 2566 fps | 96.7% |
| Hodgdon H380 | <<locked>> | 84% | 54,476 psi | 85% | 2638 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 55,158 psi | 86% | 2710 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 88% | 54,882 psi | 86% | 2667 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 98% | 55,303 psi | 87% | 2700 fps | 97.7% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,682 psi | 90% | 2736 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,667 psi | 90% | 2680 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,550 psi | 87% | 2664 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,410 psi | 68% | 2661 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 90% | 55,100 psi | 86% | 2746 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,506 psi | 57% | 1614 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,405 psi | 88% | 2631 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,376 psi | 87% | 2608 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,491 psi | 85% | 2598 fps | 99.7% |
| IMR 4350 | <<locked>> | 92% | 54,317 psi | 85% | 2644 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,216 psi | 87% | 2638 fps | 99.7% |
| IMR 4831 | <<locked>> | 94% | 56,927 psi | 89% | 2697 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,969 psi | 86% | 2651 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,782 psi | 89% | 2687 fps | 98.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,402 psi | 82% | 2726 fps | 97.9% |
| Lovex S060 | <<locked>> | 82% | 56,855 psi | 89% | 2592 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,782 psi | 87% | 2605 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 55,172 psi | 86% | 2631 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 56,376 psi | 88% | 2671 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,150 psi | 71% | 2533 fps | 99.4% |
| Norma 201 | <<locked>> | 82% | 57,029 psi | 89% | 2612 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,653 psi | 90% | 2605 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,188 psi | 88% | 2657 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,071 psi | 86% | 2697 fps | 99% |
| Norma MRPᴾ | <<locked>> | 100% | 57,319 psi | 90% | 2828 fps | 100% |
| Norma URP | <<locked>> | 92% | 55,187 psi | 86% | 2690 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 57,014 psi | 89% | 2684 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,750 psi | 83% | 2743 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 94% | 57,638 psi | 90% | 2749 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,949 psi | 74% | 2628 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,173 psi | 58% | 1650 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 54,331 psi | 85% | 2625 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,404 psi | 85% | 2720 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 56,521 psi | 89% | 2733 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,795 psi | 86% | 2759 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,294 psi | 68% | 2654 fps | 98.9% |
| Rottweil R 902 | <<locked>> | 84% | 57,682 psi | 90% | 2612 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,725 psi | 90% | 2661 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,593 psi | 87% | 2674 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 98% | 55,912 psi | 88% | 2730 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 90% | 56,811 psi | 89% | 2657 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 55,172 psi | 86% | 2631 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 55,782 psi | 87% | 2605 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,376 psi | 88% | 2671 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,622 psi | 87% | 2671 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,753 psi | 89% | 2644 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 55,085 psi | 86% | 2500 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,810 psi | 86% | 2589 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,434 psi | 87% | 2726 fps | 99.3% |
| Somchem S335 | <<locked>> | 82% | 57,435 psi | 90% | 2539 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,653 psi | 90% | 2657 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 57,421 psi | 90% | 2671 fps | 97.9% |
| Somchem S365 | <<locked>> | 94% | 54,592 psi | 86% | 2694 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,753 psi | 89% | 2707 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 54,679 psi | 86% | 2526 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,839 psi | 86% | 2543 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,332 psi | 87% | 2585 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 57,406 psi | 90% | 2684 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,344 psi | 82% | 2635 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 84% | 56,405 psi | 88% | 2585 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 56,478 psi | 89% | 2694 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 57,232 psi | 90% | 2753 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,609 psi | 90% | 2825 fps | 98.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 45,774 psi | 72% | 2628 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,956 psi | 89% | 2651 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,390 psi | 87% | 2713 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,948 psi | 72% | 2743 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,956 psi | 89% | 2651 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,898 psi | 89% | 2703 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% | 52,083 psi | 82% | 2497 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,690 psi | 78% | 2516 fps | 98.9% |
| Accurate 3100 | <<locked>> | 82% | 29,675 psi | 47% | 2218 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 49,342 psi | 77% | 2507 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,710 psi | 59% | 2405 fps | 99.3% |
| Accurate High Country | 72 gr | 88% | 39,204 psi | 61% | 2526 fps | 95% |
| Accurate MAGPRO | <<locked>> | 94% | 45,571 psi | 71% | 2635 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 46,615 psi | 73% | 2493 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 38,957 psi | 61% | 2441 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 92% | 42,293 psi | 66% | 2533 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 98% | 33,199 psi | 52% | 2385 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,474 psi | 81% | 2694 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 36,637 psi | 57% | 2392 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,137 psi | 74% | 2513 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 50,256 psi | 79% | 2575 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,825 psi | 58% | 2418 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,611 psi | 65% | 2530 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 36,303 psi | 57% | 2385 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 88% | 36,303 psi | 57% | 2431 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,948 psi | 42% | 2198 fps | 98% |
| Alliant Reloder-25 | <<locked>> | 86% | 28,631 psi | 45% | 2257 fps | 95.3% |
| Alliant Reloder-26 | 67.4 gr | 80% | 28,631 psi | 45% | 2303 fps | 96.4% |
| Bofors RP15 | <<locked>> | 92% | 38,247 psi | 60% | 2474 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 47,471 psi | 74% | 2526 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 36,303 psi | 57% | 2431 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 41,843 psi | 66% | 2418 fps | 97.7% |
| Hodgdon H1000 | <<locked>> | 98% | 41,307 psi | 65% | 2510 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 47,819 psi | 75% | 2539 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 39,566 psi | 62% | 2448 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 80% | 42,627 psi | 67% | 2464 fps | 97.2% |
| Hodgdon H4831 | <<locked>> | 92% | 45,252 psi | 71% | 2543 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 44,295 psi | 69% | 2523 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,374 psi | 54% | 2316 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,069 psi | 82% | 2618 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 35,955 psi | 56% | 2487 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 38,450 psi | 60% | 2461 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,253 psi | 43% | 1440 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,895 psi | 83% | 2582 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,052 psi | 77% | 2520 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 51,155 psi | 80% | 2549 fps | 99.5% |
| IMR 4350 | <<locked>> | 80% | 37,478 psi | 59% | 2352 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,207 psi | 68% | 2444 fps | 98.3% |
| IMR 4831 | <<locked>> | 80% | 36,274 psi | 57% | 2362 fps | 99.1% |
| IMR 4895 | <<locked>> | 80% | 51,547 psi | 81% | 2602 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 44,425 psi | 70% | 2490 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 94% | 43,076 psi | 68% | 2562 fps | 95.7% |
| Lovex S060 | <<locked>> | 80% | 53,592 psi | 84% | 2549 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 49,269 psi | 77% | 2516 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,625 psi | 64% | 2395 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 38,885 psi | 61% | 2382 fps | 97.7% |
| Lovex S071 | <<locked>> | 86% | 28,906 psi | 45% | 2201 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 53,461 psi | 84% | 2566 fps | 100% |
| Norma 202 | <<locked>> | 80% | 54,230 psi | 85% | 2559 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,603 psi | 78% | 2566 fps | 100% |
| Norma 204 | <<locked>> | 80% | 36,854 psi | 58% | 2379 fps | 95% |
| Norma MRP | <<locked>> | 84% | 33,185 psi | 52% | 2385 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 37,492 psi | 59% | 2402 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 80% | 49,922 psi | 78% | 2589 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 42,641 psi | 67% | 2569 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 36,376 psi | 57% | 2392 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 92% | 35,346 psi | 55% | 2398 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,760 psi | 44% | 1473 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,674 psi | 75% | 2523 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,251 psi | 69% | 2572 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 37,405 psi | 59% | 2425 fps | 99.1% |
| ReloadSwiss RS 70 | 66.8 gr | 80% | 36,318 psi | 57% | 2434 fps | 98.7% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 32,851 psi | 51% | 2408 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 51,140 psi | 80% | 2523 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,686 psi | 70% | 2477 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 40,596 psi | 64% | 2425 fps | 95% |
| Rottweil R 905 | <<locked>> | 86% | 37,753 psi | 59% | 2421 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 41,843 psi | 66% | 2418 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,625 psi | 64% | 2395 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 49,269 psi | 77% | 2516 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,885 psi | 61% | 2382 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,861 psi | 72% | 2530 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 53,287 psi | 84% | 2598 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,948 psi | 72% | 2379 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,740 psi | 62% | 2346 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 37,391 psi | 59% | 2415 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 53,954 psi | 85% | 2493 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,918 psi | 70% | 2474 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 44,092 psi | 69% | 2464 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 34,026 psi | 53% | 2362 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 33,750 psi | 53% | 2306 fps | 95.2% |
| Vihtavuori N135 | <<locked>> | 80% | 51,387 psi | 81% | 2484 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,430 psi | 81% | 2500 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,902 psi | 67% | 2408 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,928 psi | 61% | 2398 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 88% | 35,389 psi | 55% | 2339 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 49,719 psi | 78% | 2500 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,377 psi | 60% | 2402 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 29,776 psi | 47% | 2270 fps | 98% |
| Vihtavuori N560 | <<locked>> | 92% | 44,092 psi | 69% | 2602 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 98% | 42,801 psi | 67% | 2575 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,956 psi | 59% | 2369 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 39,755 psi | 62% | 2451 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,859 psi | 37% | 2185 fps | 97.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 53,243 psi | 83% | 2605 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 37,710 psi | 59% | 2392 fps | 95.5% |
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 100 powders for .340 Weath. Mag. loaded with the .338 | 250gr | Barnes Banded Solid RN. Norma MRP delivers the highest muzzle velocity at 2,828 fps; across all powders the maximum-charge window runs from 1,614 fps to 2,828 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:13.5 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, Accurate High Country, ReloadSwiss RS 70 rank at the top here: for .340 Weath. Mag. with the .338 | 250gr | Barnes Banded Solid RN 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.