Load Specifications
Bullet Manufacturer:Impala Bullets
Bullet Weight:210 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:1:15.0
Load data in caliber .340 Weath. Mag. with .338 | 210gr | Impala RNFP KO bullet and 100 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, ReloadSwiss RS 70 and Alliant Reloder-26.
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% | 55,448 psi | 87% | 2766 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,201 psi | 87% | 2812 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,736 psi | 83% | 2861 fps | 99.3% |
| Accurate 4064 | <<locked>> | 84% | 55,506 psi | 87% | 2818 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,158 psi | 86% | 2917 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 56,811 psi | 89% | 2884 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 57,609 psi | 90% | 2884 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,114 psi | 86% | 2940 fps | 97.8% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,011 psi | 83% | 2930 fps | 96% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,608 psi | 89% | 3009 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,230 psi | 87% | 2861 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 55,463 psi | 87% | 2884 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,940 psi | 86% | 2963 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,130 psi | 88% | 2989 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,505 psi | 85% | 2933 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,677 psi | 81% | 2936 fps | 97.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,950 psi | 77% | 2877 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,221 psi | 68% | 2802 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,666 psi | 87% | 3068 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,449 psi | 88% | 2900 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,645 psi | 75% | 2858 fps | 96.4% |
| Bofors RP3 | <<locked>> | 86% | 56,391 psi | 88% | 2881 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,677 psi | 81% | 2936 fps | 97.5% |
| Bofors RP7 | <<locked>> | 90% | 55,579 psi | 87% | 2861 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 86% | 56,594 psi | 89% | 2897 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 56,507 psi | 89% | 2956 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 90% | 56,391 psi | 88% | 2913 fps | 98.3% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 56,594 psi | 89% | 2933 fps | 96.1% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 55,434 psi | 87% | 2913 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 82% | 57,493 psi | 90% | 2894 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,419 psi | 87% | 2887 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,334 psi | 90% | 2930 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 56,463 psi | 88% | 2992 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,651 psi | 57% | 1775 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,795 psi | 86% | 2841 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 57,203 psi | 90% | 2867 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,434 psi | 88% | 2848 fps | 99.1% |
| IMR 4350 | <<locked>> | 94% | 55,883 psi | 88% | 2887 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,652 psi | 89% | 2881 fps | 99.1% |
| IMR 4831 | <<locked>> | 94% | 55,114 psi | 86% | 2900 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 56,840 psi | 89% | 2910 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,781 psi | 86% | 2867 fps | 96% |
| Lovex D073.6 | <<locked>> | 82% | 57,508 psi | 90% | 2858 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,550 psi | 87% | 2802 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,696 psi | 90% | 2864 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 57,159 psi | 90% | 2884 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 54,969 psi | 86% | 2871 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,469 psi | 70% | 2723 fps | 98.1% |
| Norma 201 | <<locked>> | 82% | 55,985 psi | 88% | 2828 fps | 100% |
| Norma 202 | <<locked>> | 82% | 56,289 psi | 88% | 2822 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,781 psi | 86% | 2871 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,420 psi | 88% | 2936 fps | 97.9% |
| Norma MRPᴾ | <<locked>> | 100% | 54,723 psi | 86% | 3022 fps | 99.1% |
| Norma URP | <<locked>> | 94% | 56,753 psi | 89% | 2946 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,143 psi | 86% | 2894 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 55,332 psi | 87% | 2946 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,440 psi | 71% | 2795 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,318 psi | 58% | 1814 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 56,304 psi | 88% | 2877 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 56,188 psi | 88% | 2949 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,695 psi | 87% | 2982 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,389 psi | 85% | 2936 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,188 psi | 88% | 3012 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,119 psi | 66% | 2808 fps | 96.4% |
| Rottweil R 902 | <<locked>> | 84% | 56,768 psi | 89% | 2831 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 56,405 psi | 88% | 2877 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,927 psi | 89% | 2910 fps | 97% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 57,276 psi | 90% | 2972 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 90% | 55,579 psi | 87% | 2861 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 57,159 psi | 90% | 2884 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,508 psi | 90% | 2858 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,696 psi | 90% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,969 psi | 86% | 2871 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,159 psi | 90% | 2930 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,143 psi | 86% | 2854 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,376 psi | 88% | 2753 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 57,072 psi | 89% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,956 psi | 89% | 2835 fps | 99.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,753 psi | 89% | 2969 fps | 98.3% |
| Somchem S335 | <<locked>> | 82% | 56,289 psi | 88% | 2753 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,464 psi | 90% | 2871 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 56,188 psi | 88% | 2871 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,550 psi | 87% | 2851 fps | 95.8% |
| Somchem S365 | <<locked>> | 96% | 55,622 psi | 87% | 2949 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,679 psi | 86% | 2897 fps | 98.6% |
| Vihtavuori N133 | <<locked>> | 82% | 56,666 psi | 89% | 2733 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,681 psi | 89% | 2785 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,753 psi | 89% | 2799 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,261 psi | 90% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,477 psi | 87% | 2887 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,314 psi | 79% | 2815 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 84% | 54,940 psi | 86% | 2799 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,650 psi | 86% | 2897 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,969 psi | 86% | 2956 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,172 psi | 86% | 3005 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,737 psi | 86% | 2854 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,724 psi | 89% | 2959 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,599 psi | 70% | 2936 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,143 psi | 86% | 2861 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,549 psi | 85% | 2887 fps | 97.6% |
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% | 52,272 psi | 82% | 2720 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,791 psi | 76% | 2707 fps | 97.3% |
| Accurate 3100 | <<locked>> | 86% | 34,084 psi | 53% | 2503 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 49,356 psi | 77% | 2730 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,463 psi | 59% | 2595 fps | 98% |
| ADI AR 2206H | <<locked>> | 80% | 53,403 psi | 84% | 2831 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,513 psi | 71% | 2687 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 46,021 psi | 72% | 2779 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 98% | 49,647 psi | 78% | 2871 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,574 psi | 78% | 2894 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,253 psi | 72% | 2717 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,095 psi | 77% | 2779 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,158 psi | 57% | 2592 fps | 97.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,480 psi | 63% | 2717 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 42,815 psi | 67% | 2717 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,873 psi | 67% | 2766 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,354 psi | 43% | 2372 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 92% | 34,301 psi | 54% | 2582 fps | 95.6% |
| Alliant Reloder-26 | 72.1 gr | 82% | 30,734 psi | 48% | 2530 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,866 psi | 83% | 2844 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 44,947 psi | 70% | 2808 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 46,876 psi | 73% | 2733 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,873 psi | 67% | 2766 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 41,321 psi | 65% | 2598 fps | 95.7% |
| Hodgdon H380 | <<locked>> | 80% | 47,021 psi | 74% | 2740 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 38,928 psi | 61% | 2631 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 80% | 41,713 psi | 65% | 2644 fps | 95% |
| Hodgdon H4831 | <<locked>> | 98% | 53,171 psi | 83% | 2877 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 98% | 51,996 psi | 81% | 2858 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 54,027 psi | 85% | 2841 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,924 psi | 53% | 2497 fps | 98.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,560 psi | 79% | 2825 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 40,451 psi | 63% | 2694 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,557 psi | 43% | 1585 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,401 psi | 81% | 2789 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,877 psi | 75% | 2720 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,038 psi | 78% | 2743 fps | 98.2% |
| IMR 4350 | <<locked>> | 82% | 39,102 psi | 61% | 2575 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,380 psi | 66% | 2625 fps | 96.5% |
| IMR 4831 | <<locked>> | 80% | 35,955 psi | 56% | 2546 fps | 97.7% |
| IMR 4895 | <<locked>> | 80% | 50,357 psi | 79% | 2808 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 51,648 psi | 81% | 2818 fps | 95.3% |
| Lovex D073.6 | <<locked>> | 80% | 54,027 psi | 85% | 2808 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,417 psi | 82% | 2756 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,573 psi | 76% | 2726 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,393 psi | 63% | 2585 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 38,696 psi | 61% | 2566 fps | 95.8% |
| Lovex S071 | <<locked>> | 92% | 35,143 psi | 55% | 2526 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 52,794 psi | 83% | 2782 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,098 psi | 83% | 2776 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,486 psi | 76% | 2769 fps | 100% |
| Norma 204 | <<locked>> | 86% | 43,787 psi | 69% | 2713 fps | 95% |
| Norma MRP | <<locked>> | 90% | 39,668 psi | 62% | 2730 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 36,912 psi | 58% | 2585 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 80% | 48,399 psi | 76% | 2789 fps | 100% |
| Ramshot Hunter | <<locked>> | 80% | 35,839 psi | 56% | 2569 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 98% | 42,511 psi | 67% | 2733 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,065 psi | 44% | 1624 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,833 psi | 73% | 2717 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,692 psi | 83% | 2897 fps | 100% |
| ReloadSwiss RS 60 | 68.6 gr | 80% | 42,815 psi | 67% | 2772 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,825 psi | 58% | 2608 fps | 97.6% |
| ReloadSwiss RS 70 | 69.7 gr | 80% | 35,824 psi | 56% | 2605 fps | 96.7% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 39,552 psi | 62% | 2746 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 50,444 psi | 79% | 2736 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,208 psi | 69% | 2680 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 50,459 psi | 79% | 2805 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 90% | 41,959 psi | 66% | 2703 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 41,321 psi | 65% | 2598 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,393 psi | 63% | 2585 fps | 97.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 54,027 psi | 85% | 2808 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 48,573 psi | 76% | 2726 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,696 psi | 61% | 2566 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,628 psi | 70% | 2726 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,851 psi | 81% | 2802 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,229 psi | 83% | 2707 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,121 psi | 71% | 2582 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,624 psi | 62% | 2530 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 44,164 psi | 69% | 2753 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 53,142 psi | 83% | 2710 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,867 psi | 84% | 2818 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,411 psi | 70% | 2677 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 52,025 psi | 82% | 2795 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 33,620 psi | 53% | 2549 fps | 99.5% |
| Somchem S385 | <<locked>> | 88% | 40,350 psi | 63% | 2638 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 53,606 psi | 84% | 2690 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,386 psi | 79% | 2700 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,256 psi | 79% | 2707 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,293 psi | 66% | 2605 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,174 psi | 60% | 2579 fps | 98% |
| Vihtavuori N165 | <<locked>> | 94% | 41,858 psi | 66% | 2657 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 48,805 psi | 76% | 2707 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,985 psi | 60% | 2589 fps | 97.8% |
| Vihtavuori N555 | <<locked>> | 80% | 29,921 psi | 47% | 2451 fps | 96.2% |
| Vihtavuori N560 | <<locked>> | 98% | 51,764 psi | 81% | 2946 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,347 psi | 59% | 2549 fps | 99.4% |
| Winchester 760 | <<locked>> | 80% | 38,928 psi | 61% | 2631 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 82% | 26,005 psi | 41% | 2405 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,808 psi | 81% | 2812 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,846 psi | 70% | 2723 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 | 210gr | Impala RNFP KO. Alliant Reloder-26 delivers the highest muzzle velocity at 3,068 fps; across all powders the maximum-charge window runs from 1,775 fps to 3,068 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 57–90 %, leaving at least 10 % headroom. The 210.0 gr projectile in 0.338" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, Alliant Reloder-22 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. ReloadSwiss RS 60, ReloadSwiss RS 70, Alliant Reloder-26 rank at the top here: for .340 Weath. Mag. with the .338 | 210gr | Impala RNFP KO 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.