Load Specifications
Bullet Manufacturer:Rhino Bullets
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:1:13.0
Load data in caliber .340 Weath. Mag. with .338 | 250gr | Rhino Penetrator 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 Accurate High Country.
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% | 54,665 psi | 86% | 2523 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,927 psi | 88% | 2602 fps | 99.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,243 psi | 83% | 2648 fps | 99.9% |
| Accurate 4064 | <<locked>> | 84% | 55,042 psi | 86% | 2579 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,593 psi | 87% | 2687 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 54,172 psi | 85% | 2785 fps | 98.4% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 55,056 psi | 86% | 2782 fps | 97.4% |
| ADI AR 2206H | <<locked>> | 82% | 57,464 psi | 90% | 2651 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,056 psi | 86% | 2612 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,420 psi | 88% | 2733 fps | 99.2% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,983 psi | 85% | 2730 fps | 98% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,172 psi | 85% | 2726 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,405 psi | 88% | 2730 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,405 psi | 88% | 2730 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,898 psi | 88% | 2631 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,057 psi | 88% | 2651 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,391 psi | 88% | 2740 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,737 psi | 84% | 2710 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,622 psi | 87% | 2723 fps | 99.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,765 psi | 83% | 2730 fps | 99% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,937 psi | 78% | 2661 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,540 psi | 68% | 2605 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 57,464 psi | 90% | 2851 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 57,406 psi | 90% | 2674 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,356 psi | 76% | 2657 fps | 98.2% |
| Bofors RP3 | <<locked>> | 86% | 56,768 psi | 89% | 2648 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,765 psi | 83% | 2730 fps | 99% |
| Bofors RP7 | <<locked>> | 90% | 56,072 psi | 88% | 2641 fps | 99.6% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 43,221 psi | 68% | 2539 fps | 96.2% |
| Hodgdon H380 | <<locked>> | 86% | 57,058 psi | 89% | 2667 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 54,172 psi | 85% | 2690 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 90% | 57,566 psi | 90% | 2700 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 98% | 54,099 psi | 85% | 2677 fps | 97.4% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,695 psi | 89% | 2713 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,652 psi | 89% | 2661 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,723 psi | 86% | 2648 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,612 psi | 67% | 2635 fps | 97.7% |
| Hodgdon Superformance | <<locked>> | 90% | 54,027 psi | 85% | 2726 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,521 psi | 57% | 1608 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,593 psi | 87% | 2612 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,563 psi | 86% | 2592 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,276 psi | 90% | 2631 fps | 99.8% |
| IMR 4350 | <<locked>> | 94% | 57,014 psi | 89% | 2674 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 57,624 psi | 90% | 2664 fps | 99.8% |
| IMR 4831 | <<locked>> | 94% | 55,999 psi | 88% | 2680 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 57,479 psi | 90% | 2677 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,869 psi | 88% | 2667 fps | 97.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,474 psi | 81% | 2707 fps | 97.6% |
| Lovex S060 | <<locked>> | 82% | 56,260 psi | 88% | 2575 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,897 psi | 86% | 2589 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,462 psi | 85% | 2615 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 55,463 psi | 87% | 2654 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,295 psi | 69% | 2513 fps | 99.3% |
| Norma 201 | <<locked>> | 82% | 56,115 psi | 88% | 2595 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,942 psi | 89% | 2589 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,347 psi | 87% | 2641 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,998 psi | 85% | 2674 fps | 98.8% |
| Norma MRPᴾ | <<locked>> | 100% | 56,043 psi | 88% | 2805 fps | 99.9% |
| Norma URP | <<locked>> | 92% | 54,201 psi | 85% | 2674 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,231 psi | 88% | 2667 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,779 psi | 81% | 2720 fps | 98% |
| Ramshot Hunter | <<locked>> | 94% | 56,507 psi | 89% | 2726 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,919 psi | 72% | 2602 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,188 psi | 58% | 1644 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,884 psi | 89% | 2654 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,363 psi | 90% | 2720 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 57,145 psi | 90% | 2749 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,303 psi | 87% | 2710 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 57,725 psi | 90% | 2792 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,250 psi | 66% | 2628 fps | 98.6% |
| Rottweil R 902 | <<locked>> | 84% | 56,797 psi | 89% | 2595 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,826 psi | 89% | 2644 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,563 psi | 86% | 2651 fps | 98.1% |
| Rottweil R 905 | <<locked>> | 98% | 55,013 psi | 86% | 2710 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 90% | 56,072 psi | 88% | 2641 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,462 psi | 85% | 2615 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 54,897 psi | 86% | 2589 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,463 psi | 87% | 2654 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,650 psi | 86% | 2654 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,970 psi | 88% | 2628 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,058 psi | 89% | 2523 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,476 psi | 85% | 2487 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 57,638 psi | 90% | 2621 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,534 psi | 85% | 2707 fps | 99.1% |
| Somchem S335 | <<locked>> | 82% | 56,565 psi | 89% | 2523 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,608 psi | 89% | 2638 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,304 psi | 88% | 2651 fps | 97.6% |
| Somchem S365 | <<locked>> | 96% | 57,130 psi | 90% | 2720 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,709 psi | 87% | 2687 fps | 99.6% |
| Vihtavuori N133 | <<locked>> | 82% | 57,609 psi | 90% | 2503 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,203 psi | 90% | 2549 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 57,348 psi | 90% | 2569 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,578 psi | 86% | 2569 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,449 psi | 88% | 2664 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 2612 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 84% | 55,448 psi | 87% | 2569 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,332 psi | 87% | 2674 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,999 psi | 88% | 2730 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 56,391 psi | 88% | 2799 fps | 98.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 44,817 psi | 70% | 2605 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,956 psi | 88% | 2635 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,172 psi | 85% | 2690 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,049 psi | 71% | 2723 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,912 psi | 88% | 2631 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,666 psi | 87% | 2680 fps | 99% |
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% | 51,329 psi | 80% | 2480 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,965 psi | 77% | 2500 fps | 98.7% |
| Accurate 3100 | <<locked>> | 82% | 29,022 psi | 45% | 2198 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 48,617 psi | 76% | 2490 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,101 psi | 58% | 2388 fps | 99.2% |
| Accurate High Country | 72.4 gr | 90% | 41,089 psi | 64% | 2562 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 96% | 47,979 psi | 75% | 2671 fps | 95.9% |
| ADI AR 2206H | <<locked>> | 80% | 54,056 psi | 85% | 2605 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,818 psi | 72% | 2474 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 38,319 psi | 60% | 2421 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 94% | 44,266 psi | 69% | 2566 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,604 psi | 79% | 2677 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 38,479 psi | 60% | 2425 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 38,479 psi | 60% | 2425 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,470 psi | 73% | 2497 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,588 psi | 78% | 2562 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,100 psi | 57% | 2395 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,857 psi | 64% | 2510 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 38,101 psi | 60% | 2418 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 90% | 38,000 psi | 60% | 2464 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,484 psi | 42% | 2182 fps | 97.6% |
| Alliant Reloder-25 | <<locked>> | 88% | 29,994 psi | 47% | 2290 fps | 95.9% |
| Alliant Reloder-26 | 66.3 gr | 80% | 28,094 psi | 44% | 2280 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 53,635 psi | 84% | 2621 fps | 100% |
| Bofors RP15 | <<locked>> | 92% | 37,507 psi | 59% | 2451 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 46,615 psi | 73% | 2507 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 38,000 psi | 60% | 2464 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 41,089 psi | 64% | 2395 fps | 97.4% |
| Hodgdon H1000 | <<locked>> | 98% | 40,553 psi | 64% | 2484 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 47,050 psi | 74% | 2520 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 39,001 psi | 61% | 2431 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 80% | 41,872 psi | 66% | 2444 fps | 96.9% |
| Hodgdon H4831 | <<locked>> | 92% | 44,338 psi | 69% | 2516 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 94% | 46,412 psi | 73% | 2552 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,620 psi | 53% | 2297 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,213 psi | 80% | 2598 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 37,536 psi | 59% | 2520 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 37,840 psi | 59% | 2444 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,296 psi | 43% | 1434 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,272 psi | 82% | 2566 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,211 psi | 76% | 2500 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,575 psi | 79% | 2533 fps | 99.4% |
| IMR 4350 | <<locked>> | 80% | 36,767 psi | 58% | 2333 fps | 96.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,482 psi | 67% | 2425 fps | 98.1% |
| IMR 4831 | <<locked>> | 80% | 35,694 psi | 56% | 2346 fps | 98.9% |
| IMR 4895 | <<locked>> | 80% | 50,879 psi | 80% | 2585 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 43,656 psi | 68% | 2467 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 94% | 42,351 psi | 66% | 2543 fps | 95.3% |
| Lovex S060 | <<locked>> | 80% | 52,953 psi | 83% | 2533 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,559 psi | 76% | 2500 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,059 psi | 63% | 2379 fps | 98.7% |
| Lovex S070 | <<locked>> | 80% | 38,334 psi | 60% | 2365 fps | 97.5% |
| Lovex S071 | <<locked>> | 88% | 30,197 psi | 47% | 2228 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 52,808 psi | 83% | 2549 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,563 psi | 84% | 2546 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,965 psi | 77% | 2549 fps | 100% |
| Norma 204 | <<locked>> | 82% | 38,711 psi | 61% | 2411 fps | 95.5% |
| Norma MRP | <<locked>> | 84% | 32,619 psi | 51% | 2369 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 36,898 psi | 58% | 2382 fps | 99% |
| Ramshot Big Game | <<locked>> | 80% | 49,139 psi | 77% | 2572 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 41,945 psi | 66% | 2546 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 35,737 psi | 56% | 2372 fps | 97.4% |
| Ramshot Magnum | <<locked>> | 92% | 34,606 psi | 54% | 2375 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,804 psi | 44% | 1470 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,949 psi | 74% | 2507 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,621 psi | 84% | 2667 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,424 psi | 68% | 2552 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,651 psi | 57% | 2405 fps | 98.9% |
| ReloadSwiss RS 70 | 65.7 gr | 80% | 35,679 psi | 56% | 2415 fps | 98.4% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 34,519 psi | 54% | 2444 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 50,285 psi | 79% | 2507 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,976 psi | 69% | 2461 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 42,525 psi | 67% | 2454 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 86% | 37,086 psi | 58% | 2402 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 41,089 psi | 64% | 2395 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,059 psi | 63% | 2379 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 48,559 psi | 76% | 2500 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,334 psi | 60% | 2365 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,063 psi | 71% | 2513 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,475 psi | 82% | 2579 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,606 psi | 84% | 2480 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,281 psi | 71% | 2365 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,218 psi | 61% | 2329 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 36,724 psi | 58% | 2395 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 53,301 psi | 84% | 2480 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,295 psi | 69% | 2461 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 46,296 psi | 73% | 2497 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 33,272 psi | 52% | 2343 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 35,230 psi | 55% | 2336 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 54,143 psi | 85% | 2464 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,604 psi | 79% | 2467 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,763 psi | 80% | 2484 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,293 psi | 66% | 2392 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,305 psi | 60% | 2379 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 88% | 34,650 psi | 54% | 2316 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 48,965 psi | 77% | 2484 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,681 psi | 59% | 2382 fps | 99% |
| Vihtavuori N555 | <<locked>> | 80% | 29,167 psi | 46% | 2251 fps | 97.7% |
| Vihtavuori N560 | <<locked>> | 92% | 43,149 psi | 68% | 2575 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 98% | 41,887 psi | 66% | 2552 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,231 psi | 58% | 2349 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 39,001 psi | 61% | 2431 fps | 97.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,395 psi | 37% | 2162 fps | 96.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,388 psi | 82% | 2585 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 36,970 psi | 58% | 2369 fps | 95% |
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 105 powders for .340 Weath. Mag. loaded with the .338 | 250gr | Rhino Penetrator. Alliant Reloder-26 delivers the highest muzzle velocity at 2,851 fps; across all powders the maximum-charge window runs from 1,608 fps to 2,851 fps. Accurate 3100 gives the best case fill at 100 %, and 105 of the 105 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:13.0 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, Accurate High Country rank at the top here: for .340 Weath. Mag. with the .338 | 250gr | Rhino Penetrator 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.