Load Specifications
Load data in caliber .340 Weath. Mag. with .338 | 265gr | Nosler AccuBond Long Range bullet and 101 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>> | 82% | 55,042 psi | 86% | 2438 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,057 psi | 88% | 2516 fps | 99.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,592 psi | 84% | 2566 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 55,492 psi | 87% | 2493 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,115 psi | 88% | 2602 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 55,376 psi | 87% | 2700 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 86% | 55,564 psi | 87% | 2526 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,811 psi | 89% | 2651 fps | 99.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,389 psi | 85% | 2651 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 34,925 psi | 55% | 2352 fps | 96.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,578 psi | 86% | 2641 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,318 psi | 88% | 2546 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,405 psi | 88% | 2566 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,608 psi | 89% | 2648 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,259 psi | 85% | 2625 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,043 psi | 88% | 2641 fps | 99.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,229 psi | 83% | 2648 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,357 psi | 79% | 2579 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,830 psi | 69% | 2526 fps | 99.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,696 psi | 90% | 2759 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,849 psi | 77% | 2582 fps | 98.6% |
| Bofors RP3 | <<locked>> | 86% | 57,116 psi | 90% | 2562 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 39,740 psi | 62% | 2457 fps | 95.9% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,229 psi | 83% | 2648 fps | 99.3% |
| Bofors RP7 | <<locked>> | 90% | 56,275 psi | 88% | 2556 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 43,526 psi | 68% | 2467 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 86% | 57,479 psi | 90% | 2582 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 54,462 psi | 85% | 2605 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 54,375 psi | 85% | 2566 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 98% | 54,621 psi | 86% | 2598 fps | 97.8% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,145 psi | 90% | 2631 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,985 psi | 89% | 2575 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,230 psi | 87% | 2562 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,931 psi | 67% | 2562 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 90% | 54,346 psi | 85% | 2641 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,448 psi | 57% | 1542 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,970 psi | 88% | 2526 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,940 psi | 86% | 2507 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,435 psi | 90% | 2543 fps | 99.9% |
| IMR 4350 | <<locked>> | 94% | 57,334 psi | 90% | 2589 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,578 psi | 86% | 2533 fps | 99.8% |
| IMR 4831 | <<locked>> | 94% | 56,333 psi | 88% | 2592 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,549 psi | 85% | 2546 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,231 psi | 88% | 2585 fps | 98.2% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,837 psi | 81% | 2625 fps | 98.1% |
| Lovex S060 | <<locked>> | 82% | 56,478 psi | 89% | 2490 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,347 psi | 87% | 2503 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,607 psi | 86% | 2530 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 55,854 psi | 88% | 2572 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,701 psi | 70% | 2438 fps | 99.5% |
| Norma 201 | <<locked>> | 82% | 56,405 psi | 88% | 2507 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,290 psi | 90% | 2503 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,695 psi | 87% | 2552 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,418 psi | 85% | 2595 fps | 99.1% |
| Norma MRPᴾ | <<locked>> | 100% | 56,449 psi | 88% | 2720 fps | 100% |
| Norma URP | <<locked>> | 92% | 54,621 psi | 86% | 2589 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,536 psi | 89% | 2582 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,141 psi | 82% | 2641 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 94% | 56,884 psi | 89% | 2641 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,354 psi | 73% | 2530 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,188 psi | 58% | 1581 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,421 psi | 90% | 2572 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,580 psi | 90% | 2628 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,696 psi | 90% | 2661 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,695 psi | 87% | 2625 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,114 psi | 85% | 2654 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,569 psi | 67% | 2556 fps | 99% |
| Rottweil R 902 | <<locked>> | 84% | 57,159 psi | 90% | 2507 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,217 psi | 90% | 2556 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,984 psi | 86% | 2572 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 98% | 55,172 psi | 86% | 2625 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 90% | 56,275 psi | 88% | 2556 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,607 psi | 86% | 2530 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 55,347 psi | 87% | 2503 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,854 psi | 88% | 2572 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,100 psi | 86% | 2569 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,086 psi | 88% | 2539 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,406 psi | 90% | 2438 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,868 psi | 86% | 2405 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,244 psi | 85% | 2490 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,679 psi | 86% | 2621 fps | 99.4% |
| Somchem S335 | <<locked>> | 82% | 56,884 psi | 89% | 2438 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,116 psi | 90% | 2552 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,492 psi | 89% | 2566 fps | 98% |
| Somchem S365 | <<locked>> | 96% | 57,421 psi | 90% | 2631 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,941 psi | 88% | 2605 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 84% | 57,696 psi | 90% | 2464 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,346 psi | 85% | 2441 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,897 psi | 86% | 2487 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,913 psi | 89% | 2582 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,634 psi | 81% | 2533 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 84% | 55,854 psi | 88% | 2487 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,709 psi | 87% | 2589 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,275 psi | 88% | 2644 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,811 psi | 89% | 2717 fps | 98.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 45,150 psi | 71% | 2530 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,188 psi | 88% | 2549 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,708 psi | 86% | 2608 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,353 psi | 71% | 2641 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,420 psi | 88% | 2549 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,144 psi | 88% | 2602 fps | 99.3% |
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% | 51,735 psi | 81% | 2398 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,443 psi | 77% | 2421 fps | 99% |
| Accurate 3100 | <<locked>> | 82% | 29,370 psi | 46% | 2139 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 49,052 psi | 77% | 2411 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,362 psi | 59% | 2316 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 94% | 44,947 psi | 70% | 2536 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 46,122 psi | 72% | 2395 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 36,260 psi | 57% | 2300 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 92% | 41,829 psi | 66% | 2438 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 98% | 32,822 psi | 51% | 2300 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,865 psi | 80% | 2589 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,702 psi | 73% | 2415 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,922 psi | 78% | 2477 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,361 psi | 57% | 2323 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,176 psi | 65% | 2431 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 35,940 psi | 56% | 2297 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 88% | 35,911 psi | 56% | 2343 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,731 psi | 42% | 2119 fps | 98.2% |
| Alliant Reloder-25 | <<locked>> | 86% | 28,384 psi | 44% | 2175 fps | 95.7% |
| Alliant Reloder-26 | 63.6 gr | 80% | 28,297 psi | 44% | 2218 fps | 96.7% |
| Bofors RP15 | <<locked>> | 90% | 35,636 psi | 56% | 2333 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 46,963 psi | 74% | 2428 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 37,217 psi | 58% | 2405 fps | 95% |
| Bofors RP5 | <<locked>> | 88% | 35,911 psi | 56% | 2343 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 41,452 psi | 65% | 2323 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 96% | 38,174 psi | 60% | 2359 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 47,413 psi | 74% | 2441 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 39,218 psi | 61% | 2356 fps | 98% |
| Hodgdon H4350 | <<locked>> | 80% | 42,177 psi | 66% | 2372 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 92% | 44,614 psi | 70% | 2441 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 43,816 psi | 69% | 2428 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 34,069 psi | 53% | 2228 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,590 psi | 81% | 2516 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 35,447 psi | 56% | 2395 fps | 95.6% |
| Hodgdon Superformance | 65.6 gr | 80% | 38,043 psi | 60% | 2369 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,224 psi | 43% | 1375 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,533 psi | 82% | 2484 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,530 psi | 76% | 2421 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,879 psi | 80% | 2454 fps | 99.6% |
| IMR 4350 | <<locked>> | 80% | 37,130 psi | 58% | 2264 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,830 psi | 67% | 2349 fps | 98.5% |
| IMR 4831 | <<locked>> | 80% | 35,926 psi | 56% | 2274 fps | 99.2% |
| IMR 4895 | <<locked>> | 80% | 51,184 psi | 80% | 2500 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 43,903 psi | 69% | 2395 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 92% | 40,001 psi | 63% | 2415 fps | 95% |
| Lovex S060 | <<locked>> | 80% | 53,301 psi | 84% | 2448 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,921 psi | 77% | 2418 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,393 psi | 63% | 2306 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 38,508 psi | 60% | 2290 fps | 97.9% |
| Lovex S071 | <<locked>> | 86% | 28,703 psi | 45% | 2123 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 53,171 psi | 83% | 2467 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,766 psi | 84% | 2461 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,255 psi | 77% | 2464 fps | 100% |
| Norma 204 | <<locked>> | 80% | 36,390 psi | 57% | 2287 fps | 95.2% |
| Norma MRP | <<locked>> | 84% | 32,735 psi | 51% | 2297 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 37,086 psi | 58% | 2310 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 80% | 49,327 psi | 77% | 2487 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 39,349 psi | 62% | 2415 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 35,926 psi | 56% | 2303 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 92% | 34,853 psi | 55% | 2310 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,775 psi | 44% | 1411 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,384 psi | 74% | 2428 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,896 psi | 84% | 2582 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,758 psi | 69% | 2474 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,956 psi | 58% | 2333 fps | 99.2% |
| ReloadSwiss RS 70 | 63 gr | 80% | 35,868 psi | 56% | 2339 fps | 98.8% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 32,387 psi | 51% | 2320 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 50,763 psi | 80% | 2425 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,237 psi | 69% | 2382 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 40,118 psi | 63% | 2329 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 84% | 35,012 psi | 55% | 2280 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 41,452 psi | 65% | 2323 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,393 psi | 63% | 2306 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 48,921 psi | 77% | 2418 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,508 psi | 60% | 2290 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,295 psi | 71% | 2431 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,736 psi | 83% | 2493 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,998 psi | 85% | 2398 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,672 psi | 72% | 2287 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,436 psi | 62% | 2257 fps | 97.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 34,679 psi | 54% | 2277 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 53,693 psi | 84% | 2398 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,628 psi | 70% | 2379 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 43,511 psi | 68% | 2369 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 33,678 psi | 53% | 2274 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 33,330 psi | 52% | 2218 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 51,068 psi | 80% | 2385 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,981 psi | 80% | 2398 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,496 psi | 67% | 2313 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,566 psi | 60% | 2306 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 88% | 34,969 psi | 55% | 2251 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 49,313 psi | 77% | 2402 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,000 psi | 60% | 2310 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 29,385 psi | 46% | 2185 fps | 98.2% |
| Vihtavuori N560 | <<locked>> | 92% | 43,424 psi | 68% | 2500 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 98% | 42,192 psi | 66% | 2480 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,565 psi | 59% | 2280 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 39,363 psi | 62% | 2359 fps | 98% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,554 psi | 37% | 2106 fps | 97.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,765 psi | 83% | 2500 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 37,246 psi | 58% | 2300 fps | 95.7% |
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 106 powders for .340 Weath. Mag. loaded with the .338 | 265gr | Nosler AccuBond Long Range. Alliant Reloder-26 delivers the highest muzzle velocity at 2,759 fps; across all powders the maximum-charge window runs from 1,542 fps to 2,759 fps. Accurate 3100 gives the best case fill at 100 %, and 106 of the 106 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 48–90 %, leaving at least 10 % headroom. The 265.0 gr projectile in 0.338" calls for a 1:11.5 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, ReloadSwiss RS 70, Hodgdon Superformance rank at the top here: for .340 Weath. Mag. with the .338 | 265gr | Nosler AccuBond Long Range they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, 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.