Load Specifications
Bullet:.338 | 210gr | Barnes X BT
Bullet Manufacturer:Barnes
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:1:14.0
Load data in caliber .340 Weath. Mag. with .338 | 210gr | Barnes X BT bullet and 101 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 and ReloadSwiss RS 60.
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% | 54,882 psi | 86% | 2756 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,636 psi | 86% | 2799 fps | 98.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,982 psi | 81% | 2844 fps | 99.2% |
| Accurate 4064 | <<locked>> | 84% | 54,897 psi | 86% | 2808 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,143 psi | 85% | 2900 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 55,622 psi | 87% | 3035 fps | 97.1% |
| ADI AR 2206H | <<locked>> | 82% | 56,289 psi | 88% | 2871 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,913 psi | 89% | 2871 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,418 psi | 85% | 2923 fps | 97.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,912 psi | 88% | 2995 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 54,491 psi | 85% | 2923 fps | 97.7% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 54,491 psi | 85% | 2923 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,679 psi | 86% | 2851 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,955 psi | 86% | 2871 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,493 psi | 90% | 2995 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,419 psi | 87% | 2976 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,116 psi | 90% | 2969 fps | 98.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,024 psi | 80% | 2917 fps | 97.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,211 psi | 76% | 2861 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,627 psi | 67% | 2782 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,940 psi | 86% | 3054 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,796 psi | 87% | 2884 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,978 psi | 74% | 2841 fps | 96.1% |
| Bofors RP3 | <<locked>> | 86% | 55,637 psi | 87% | 2867 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,024 psi | 80% | 2917 fps | 97.2% |
| Bofors RP7 | <<locked>> | 90% | 54,969 psi | 86% | 2844 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 86% | 55,927 psi | 88% | 2881 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 55,927 psi | 88% | 2943 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 90% | 55,811 psi | 87% | 2897 fps | 98.1% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 55,883 psi | 88% | 2917 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 82% | 56,913 psi | 89% | 2881 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,491 psi | 85% | 2871 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,608 psi | 89% | 2913 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,767 psi | 87% | 2979 fps | 98.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,521 psi | 57% | 1765 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,392 psi | 90% | 2874 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,348 psi | 90% | 2854 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,565 psi | 89% | 2854 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,840 psi | 88% | 2835 fps | 99% |
| IMR 4350 | <<locked>> | 94% | 55,143 psi | 86% | 2871 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,072 psi | 88% | 2867 fps | 99% |
| IMR 4831 | <<locked>> | 94% | 54,462 psi | 85% | 2890 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 56,347 psi | 88% | 2900 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,667 psi | 90% | 2907 fps | 96.4% |
| Lovex D073.6 | <<locked>> | 82% | 57,014 psi | 89% | 2848 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,056 psi | 86% | 2792 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,159 psi | 90% | 2851 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,478 psi | 89% | 2867 fps | 99.7% |
| Lovex S070 | <<locked>> | 94% | 57,667 psi | 90% | 2910 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,700 psi | 68% | 2703 fps | 97.9% |
| Norma 201 | <<locked>> | 82% | 55,419 psi | 87% | 2815 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,767 psi | 87% | 2812 fps | 100% |
| Norma 203B | <<locked>> | 86% | 57,609 psi | 90% | 2907 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,724 psi | 87% | 2920 fps | 97.7% |
| Norma MRPᴾ | <<locked>> | 100% | 53,853 psi | 84% | 3002 fps | 98.9% |
| Norma URP | <<locked>> | 94% | 55,956 psi | 88% | 2930 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,404 psi | 85% | 2877 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,534 psi | 85% | 2930 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,875 psi | 70% | 2776 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,347 psi | 59% | 1811 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,724 psi | 87% | 2861 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,434 psi | 87% | 2933 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,969 psi | 86% | 2969 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 57,116 psi | 90% | 2972 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,477 psi | 87% | 2995 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 55,985 psi | 88% | 2815 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,666 psi | 87% | 2864 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,362 psi | 88% | 2897 fps | 96.8% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,492 psi | 89% | 2956 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 90% | 54,969 psi | 86% | 2844 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,478 psi | 89% | 2867 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 57,014 psi | 89% | 2848 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,159 psi | 90% | 2851 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 57,667 psi | 90% | 2910 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,536 psi | 89% | 2917 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 57,551 psi | 90% | 2874 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,505 psi | 85% | 2841 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 56,028 psi | 88% | 2743 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,347 psi | 88% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,391 psi | 88% | 2822 fps | 99% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,970 psi | 88% | 2953 fps | 98.1% |
| Somchem S335 | <<locked>> | 82% | 55,753 psi | 87% | 2743 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,811 psi | 89% | 2858 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,680 psi | 87% | 2858 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 54,752 psi | 86% | 2933 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,493 psi | 90% | 2936 fps | 98.9% |
| Vihtavuori N133 | <<locked>> | 82% | 56,304 psi | 88% | 2723 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,086 psi | 88% | 2776 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,086 psi | 88% | 2785 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,623 psi | 89% | 2828 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,621 psi | 86% | 2871 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,661 psi | 78% | 2799 fps | 97.3% |
| Vihtavuori N540 | <<locked>> | 84% | 54,302 psi | 85% | 2789 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,435 psi | 90% | 2933 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,099 psi | 85% | 2943 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,302 psi | 85% | 2982 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,638 psi | 90% | 2887 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,144 psi | 88% | 2946 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,787 psi | 69% | 2917 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,650 psi | 86% | 2851 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,606 psi | 84% | 2867 fps | 97.4% |
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% | 51,648 psi | 81% | 2710 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,196 psi | 76% | 2690 fps | 97.1% |
| Accurate 3100 | <<locked>> | 88% | 35,636 psi | 56% | 2536 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 48,805 psi | 76% | 2717 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,985 psi | 58% | 2582 fps | 97.8% |
| Accurate High Country | <<locked>> | 96% | 48,660 psi | 76% | 2913 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 52,881 psi | 83% | 2818 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 45,005 psi | 71% | 2674 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 92% | 45,324 psi | 71% | 2759 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,052 psi | 77% | 2881 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 45,324 psi | 71% | 2759 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 45,324 psi | 71% | 2759 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,730 psi | 72% | 2703 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,588 psi | 76% | 2769 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,708 psi | 56% | 2579 fps | 97.7% |
| Alliant Reloder-17 | 67.8 gr | 80% | 40,074 psi | 63% | 2703 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 44,831 psi | 70% | 2756 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 42,438 psi | 67% | 2753 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,006 psi | 42% | 2359 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 92% | 33,779 psi | 53% | 2562 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 84% | 32,401 psi | 51% | 2575 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,460 psi | 82% | 2835 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 44,266 psi | 69% | 2789 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 46,238 psi | 72% | 2720 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 42,438 psi | 67% | 2753 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 40,886 psi | 64% | 2585 fps | 95.5% |
| Hodgdon H380 | <<locked>> | 80% | 46,369 psi | 73% | 2723 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 38,348 psi | 60% | 2615 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 82% | 43,816 psi | 69% | 2684 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 98% | 52,489 psi | 82% | 2861 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 53,417 psi | 84% | 2828 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,489 psi | 52% | 2480 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,821 psi | 78% | 2812 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 39,929 psi | 63% | 2677 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,485 psi | 43% | 1581 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,894 psi | 80% | 2776 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 54,070 psi | 85% | 2808 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,340 psi | 74% | 2707 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,617 psi | 78% | 2730 fps | 98.1% |
| IMR 4350 | <<locked>> | 84% | 41,060 psi | 64% | 2615 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,945 psi | 66% | 2612 fps | 96.3% |
| IMR 4831 | <<locked>> | 80% | 35,505 psi | 56% | 2533 fps | 97.5% |
| IMR 4895 | <<locked>> | 80% | 49,748 psi | 78% | 2795 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 51,024 psi | 80% | 2802 fps | 95% |
| Lovex D073.6 | <<locked>> | 80% | 53,490 psi | 84% | 2799 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,909 psi | 81% | 2743 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,022 psi | 75% | 2713 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,929 psi | 63% | 2572 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 38,261 psi | 60% | 2552 fps | 95.6% |
| Lovex S071 | <<locked>> | 92% | 34,563 psi | 54% | 2510 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 52,243 psi | 82% | 2769 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,533 psi | 82% | 2766 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,993 psi | 75% | 2756 fps | 100% |
| Norma 204 | <<locked>> | 88% | 45,977 psi | 72% | 2753 fps | 95.6% |
| Norma MRP | <<locked>> | 90% | 39,189 psi | 61% | 2713 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 36,434 psi | 57% | 2569 fps | 97.6% |
| Ramshot Big Game | <<locked>> | 80% | 47,964 psi | 75% | 2776 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 80% | 35,317 psi | 55% | 2552 fps | 95.3% |
| Ramshot Magnum | <<locked>> | 98% | 41,989 psi | 66% | 2717 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,978 psi | 44% | 1617 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,267 psi | 73% | 2700 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,866 psi | 81% | 2877 fps | 100% |
| ReloadSwiss RS 60 | 67.8 gr | 80% | 42,395 psi | 66% | 2759 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,245 psi | 57% | 2592 fps | 97.3% |
| ReloadSwiss RS 70 | 68.9 gr | 80% | 35,462 psi | 56% | 2592 fps | 96.5% |
| Rottweil R 902 | <<locked>> | 80% | 49,951 psi | 78% | 2723 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,685 psi | 68% | 2667 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 94% | 49,937 psi | 78% | 2792 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 92% | 44,019 psi | 69% | 2740 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 40,886 psi | 64% | 2585 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,929 psi | 63% | 2572 fps | 97.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,490 psi | 84% | 2799 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 48,022 psi | 75% | 2713 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,261 psi | 60% | 2552 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,005 psi | 69% | 2710 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,809 psi | 84% | 2818 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,184 psi | 80% | 2789 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,678 psi | 83% | 2697 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,628 psi | 70% | 2569 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,247 psi | 62% | 2516 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 43,598 psi | 68% | 2736 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 52,620 psi | 82% | 2697 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,374 psi | 84% | 2808 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,888 psi | 69% | 2664 fps | 99.9% |
| Somchem S365 | <<locked>> | 80% | 33,199 psi | 52% | 2536 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 39,813 psi | 62% | 2625 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 52,997 psi | 83% | 2677 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,792 psi | 78% | 2687 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,734 psi | 78% | 2697 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,814 psi | 66% | 2595 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,724 psi | 59% | 2566 fps | 97.8% |
| Vihtavuori N165 | <<locked>> | 94% | 41,205 psi | 65% | 2641 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 48,138 psi | 75% | 2694 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,405 psi | 59% | 2572 fps | 97.6% |
| Vihtavuori N555 | <<locked>> | 80% | 29,457 psi | 46% | 2438 fps | 95.9% |
| Vihtavuori N560 | <<locked>> | 98% | 50,923 psi | 80% | 2927 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,014 psi | 58% | 2539 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 38,493 psi | 60% | 2618 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 82% | 25,643 psi | 40% | 2385 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,126 psi | 80% | 2795 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 44,208 psi | 69% | 2703 fps | 95.2% |
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 101 powders for .340 Weath. Mag. loaded with the .338 | 210gr | Barnes X BT. Alliant Reloder-26 delivers the highest muzzle velocity at 3,054 fps; across all powders the maximum-charge window runs from 1,765 fps to 3,054 fps. Accurate 3100 gives the best case fill at 100 %, and 101 of the 101 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 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, Alliant Reloder-19 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 70, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .340 Weath. Mag. with the .338 | 210gr | Barnes X BT 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.