Load Specifications
Bullet Manufacturer:Berger
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:1:11.5
Load data in caliber .340 Weath. Mag. with .338 | 250gr | Berger Hybrid OTM 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>> | 84% | 57,377 psi | 90% | 2552 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,100 psi | 86% | 2582 fps | 99.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,011 psi | 82% | 2625 fps | 99.9% |
| Accurate 4064 | <<locked>> | 86% | 57,725 psi | 90% | 2608 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,650 psi | 86% | 2671 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 56,855 psi | 89% | 2818 fps | 98.7% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 53,882 psi | 84% | 2762 fps | 97.1% |
| ADI AR 2206H | <<locked>> | 82% | 56,710 psi | 89% | 2635 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,375 psi | 85% | 2595 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,492 psi | 87% | 2713 fps | 99% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,185 psi | 83% | 2710 fps | 97.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 57,246 psi | 90% | 2766 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,172 psi | 86% | 2618 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,317 psi | 87% | 2638 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 55,274 psi | 87% | 2720 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,652 psi | 89% | 2743 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,665 psi | 86% | 2703 fps | 99% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,866 psi | 81% | 2710 fps | 98.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,936 psi | 77% | 2644 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,627 psi | 67% | 2582 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,999 psi | 88% | 2828 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,550 psi | 89% | 2657 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,500 psi | 74% | 2638 fps | 98% |
| Bofors RP3 | <<locked>> | 86% | 55,782 psi | 87% | 2631 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,866 psi | 81% | 2710 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 55,317 psi | 87% | 2625 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 86% | 56,217 psi | 88% | 2651 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 56,811 psi | 89% | 2720 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 90% | 56,710 psi | 89% | 2680 fps | 99.3% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 57,101 psi | 89% | 2713 fps | 97.8% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 55,811 psi | 87% | 2697 fps | 97.6% |
| Hodgdon H4895 | <<locked>> | 82% | 57,348 psi | 90% | 2644 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,506 psi | 87% | 2644 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,464 psi | 90% | 2677 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 41,698 psi | 65% | 2608 fps | 97.3% |
| Hodgdon Superformance | <<locked>> | 92% | 56,898 psi | 89% | 2762 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,492 psi | 57% | 1601 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,824 psi | 86% | 2598 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,290 psi | 90% | 2621 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,405 psi | 88% | 2612 fps | 99.8% |
| IMR 4350 | <<locked>> | 94% | 56,043 psi | 88% | 2654 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,840 psi | 89% | 2648 fps | 99.8% |
| IMR 4831 | <<locked>> | 94% | 54,940 psi | 86% | 2661 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 56,768 psi | 89% | 2661 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,027 psi | 86% | 2648 fps | 97.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 50,633 psi | 79% | 2687 fps | 97.4% |
| Lovex D073.6 | <<locked>> | 82% | 57,174 psi | 90% | 2608 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,535 psi | 87% | 2562 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,363 psi | 90% | 2615 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,739 psi | 89% | 2641 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 54,694 psi | 86% | 2638 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,366 psi | 68% | 2493 fps | 99.1% |
| Norma 201 | <<locked>> | 82% | 55,332 psi | 87% | 2579 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,159 psi | 88% | 2575 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,592 psi | 86% | 2625 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,797 psi | 89% | 2707 fps | 99% |
| Norma MRPᴾ | <<locked>> | 100% | 54,853 psi | 86% | 2785 fps | 99.8% |
| Norma URP | <<locked>> | 94% | 56,840 psi | 89% | 2703 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,361 psi | 87% | 2651 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 50,778 psi | 80% | 2697 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 94% | 55,521 psi | 87% | 2710 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,005 psi | 71% | 2582 fps | 98.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,970 psi | 58% | 1634 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,086 psi | 88% | 2638 fps | 99.9% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,275 psi | 88% | 2700 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 56,173 psi | 88% | 2733 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,244 psi | 85% | 2694 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,521 psi | 89% | 2772 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,466 psi | 65% | 2605 fps | 98.3% |
| Rottweil R 902 | <<locked>> | 84% | 56,028 psi | 88% | 2579 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,883 psi | 88% | 2628 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 57,334 psi | 90% | 2684 fps | 98.4% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 57,711 psi | 90% | 2743 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 90% | 55,317 psi | 87% | 2625 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,739 psi | 89% | 2641 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,174 psi | 90% | 2608 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,363 psi | 90% | 2615 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,694 psi | 86% | 2638 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,421 psi | 90% | 2684 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,056 psi | 86% | 2612 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,260 psi | 88% | 2510 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,029 psi | 89% | 2513 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,652 psi | 89% | 2602 fps | 99.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 57,203 psi | 90% | 2736 fps | 99.3% |
| Somchem S335 | <<locked>> | 82% | 55,840 psi | 88% | 2510 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,522 psi | 90% | 2628 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,927 psi | 88% | 2625 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,274 psi | 87% | 2628 fps | 97.3% |
| Somchem S365 | <<locked>> | 96% | 55,970 psi | 88% | 2703 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,491 psi | 85% | 2667 fps | 99.5% |
| Vihtavuori N133 | <<locked>> | 82% | 56,797 psi | 89% | 2490 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,318 psi | 88% | 2536 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,652 psi | 89% | 2556 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,159 psi | 90% | 2598 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,579 psi | 87% | 2651 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,256 psi | 79% | 2592 fps | 98.7% |
| Vihtavuori N540 | <<locked>> | 84% | 54,766 psi | 86% | 2556 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,592 psi | 86% | 2657 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,679 psi | 86% | 2710 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,274 psi | 87% | 2776 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,013 psi | 86% | 2618 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 57,043 psi | 89% | 2723 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,034 psi | 69% | 2700 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,274 psi | 87% | 2621 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,752 psi | 86% | 2664 fps | 98.9% |
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% | 50,444 psi | 79% | 2467 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,327 psi | 76% | 2484 fps | 98.5% |
| Accurate 3100 | <<locked>> | 84% | 30,414 psi | 48% | 2231 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 47,761 psi | 75% | 2477 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,376 psi | 57% | 2372 fps | 99% |
| Accurate High Country | 71.2 gr | 90% | 40,205 psi | 63% | 2539 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 96% | 46,949 psi | 74% | 2648 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 53,345 psi | 84% | 2592 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,339 psi | 71% | 2461 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 37,840 psi | 59% | 2405 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 94% | 43,656 psi | 68% | 2546 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,647 psi | 78% | 2657 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,745 psi | 72% | 2484 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,849 psi | 77% | 2546 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,607 psi | 56% | 2379 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,045 psi | 63% | 2490 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 37,391 psi | 59% | 2398 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 90% | 37,376 psi | 59% | 2444 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,005 psi | 41% | 2162 fps | 97.3% |
| Alliant Reloder-25 | <<locked>> | 88% | 29,472 psi | 46% | 2270 fps | 95.5% |
| Alliant Reloder-26 | 65.2 gr | 80% | 27,543 psi | 43% | 2260 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,982 psi | 83% | 2608 fps | 100% |
| Bofors RP15 | <<locked>> | 92% | 36,883 psi | 58% | 2431 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 45,861 psi | 72% | 2490 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 37,376 psi | 59% | 2444 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 40,480 psi | 63% | 2379 fps | 97.1% |
| Hodgdon H380 | <<locked>> | 80% | 46,311 psi | 73% | 2507 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 80% | 38,189 psi | 60% | 2411 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 80% | 41,249 psi | 65% | 2428 fps | 96.7% |
| Hodgdon H4831 | <<locked>> | 94% | 46,586 psi | 73% | 2552 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 45,818 psi | 72% | 2536 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 53,925 psi | 85% | 2598 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,112 psi | 52% | 2280 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,473 psi | 79% | 2585 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 36,840 psi | 58% | 2497 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 37,188 psi | 58% | 2425 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,137 psi | 43% | 1424 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,547 psi | 81% | 2552 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,645 psi | 75% | 2487 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,922 psi | 78% | 2520 fps | 99.2% |
| IMR 4350 | <<locked>> | 80% | 36,172 psi | 57% | 2316 fps | 95.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,872 psi | 66% | 2405 fps | 97.9% |
| IMR 4831 | <<locked>> | 80% | 35,027 psi | 55% | 2329 fps | 98.7% |
| IMR 4895 | <<locked>> | 80% | 50,111 psi | 79% | 2569 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 45,730 psi | 72% | 2500 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 96% | 44,309 psi | 69% | 2572 fps | 95.7% |
| Lovex D073.6 | <<locked>> | 80% | 53,476 psi | 84% | 2562 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,228 psi | 82% | 2516 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,819 psi | 75% | 2484 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,407 psi | 62% | 2362 fps | 98.5% |
| Lovex S070 | <<locked>> | 80% | 37,695 psi | 59% | 2349 fps | 97.2% |
| Lovex S071 | <<locked>> | 88% | 29,646 psi | 46% | 2211 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 51,996 psi | 81% | 2533 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,750 psi | 83% | 2533 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,211 psi | 76% | 2533 fps | 100% |
| Norma 204 | <<locked>> | 82% | 38,000 psi | 60% | 2392 fps | 95.1% |
| Norma MRP | <<locked>> | 86% | 34,229 psi | 54% | 2405 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 36,201 psi | 57% | 2365 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 80% | 48,254 psi | 76% | 2552 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 41,191 psi | 65% | 2523 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 34,998 psi | 55% | 2352 fps | 97.1% |
| Ramshot Magnum | <<locked>> | 94% | 36,405 psi | 57% | 2411 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,630 psi | 43% | 1460 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,325 psi | 73% | 2490 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,518 psi | 82% | 2651 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,569 psi | 67% | 2536 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,027 psi | 56% | 2388 fps | 98.7% |
| ReloadSwiss RS 70 | 64.6 gr | 80% | 35,027 psi | 55% | 2392 fps | 98.2% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 33,779 psi | 53% | 2421 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 49,690 psi | 78% | 2493 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,236 psi | 68% | 2444 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 41,829 psi | 66% | 2438 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 86% | 36,318 psi | 57% | 2382 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 40,480 psi | 63% | 2379 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,407 psi | 62% | 2362 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,476 psi | 84% | 2562 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,819 psi | 75% | 2484 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,695 psi | 59% | 2349 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,193 psi | 69% | 2493 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,590 psi | 81% | 2562 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,997 psi | 83% | 2467 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,788 psi | 70% | 2352 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,609 psi | 61% | 2313 fps | 97.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 38,406 psi | 60% | 2428 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 52,562 psi | 82% | 2467 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,896 psi | 84% | 2582 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,540 psi | 68% | 2441 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 45,498 psi | 71% | 2477 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 32,605 psi | 51% | 2326 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 34,708 psi | 54% | 2320 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 53,577 psi | 84% | 2451 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,966 psi | 78% | 2457 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,995 psi | 78% | 2470 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,626 psi | 65% | 2379 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,637 psi | 59% | 2362 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 90% | 36,260 psi | 57% | 2346 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 48,312 psi | 76% | 2470 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,072 psi | 58% | 2369 fps | 98.8% |
| Vihtavuori N555 | <<locked>> | 80% | 28,529 psi | 45% | 2231 fps | 97.4% |
| Vihtavuori N560 | <<locked>> | 94% | 45,295 psi | 71% | 2612 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,724 psi | 58% | 2336 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 38,377 psi | 60% | 2415 fps | 97.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 22,931 psi | 36% | 2139 fps | 96.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,706 psi | 81% | 2572 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 38,798 psi | 61% | 2402 fps | 95.6% |
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 | Berger Hybrid OTM. Alliant Reloder-26 delivers the highest muzzle velocity at 2,828 fps; across all powders the maximum-charge window runs from 1,601 fps to 2,828 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 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, Accurate MAGPRO 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 | Berger Hybrid OTM 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.