Load Specifications
Bullet Manufacturer:Sierra
Bullet Weight:225 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:1:15.5
Load data in caliber .340 Weath. Mag. with .338 | 225gr | Sierra Pro-Hunter bullet and 105 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-26 and Alliant Reloder-16.
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% | 57,014 psi | 89% | 2717 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 56,159 psi | 88% | 2749 fps | 99.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,967 psi | 81% | 2782 fps | 99.6% |
| Accurate 4064 | <<locked>> | 86% | 57,290 psi | 90% | 2769 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 54,317 psi | 85% | 2831 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 56,362 psi | 88% | 2802 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 57,493 psi | 90% | 2805 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 55,303 psi | 87% | 2874 fps | 98.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,011 psi | 83% | 2867 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,782 psi | 89% | 2930 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 54,694 psi | 86% | 2779 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,969 psi | 86% | 2802 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,984 psi | 86% | 2884 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 56,434 psi | 88% | 2910 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 54,462 psi | 85% | 2861 fps | 98.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,692 psi | 81% | 2864 fps | 98.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,747 psi | 76% | 2802 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 42,482 psi | 67% | 2726 fps | 99.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,869 psi | 88% | 2992 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 56,275 psi | 88% | 2822 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 47,384 psi | 74% | 2789 fps | 97.3% |
| Bofors RP3 | <<locked>> | 86% | 55,477 psi | 87% | 2795 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,692 psi | 81% | 2864 fps | 98.2% |
| Bofors RP7 | <<locked>> | 90% | 55,042 psi | 86% | 2782 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 86% | 55,970 psi | 88% | 2815 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 56,608 psi | 89% | 2884 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 90% | 56,536 psi | 89% | 2844 fps | 98.9% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 56,797 psi | 89% | 2871 fps | 97.1% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 55,637 psi | 87% | 2851 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 82% | 57,014 psi | 89% | 2808 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 55,274 psi | 87% | 2808 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 57,276 psi | 90% | 2848 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 41,611 psi | 65% | 2753 fps | 96.3% |
| Hodgdon Superformance | <<locked>> | 92% | 56,811 psi | 89% | 2923 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,419 psi | 57% | 1719 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 54,549 psi | 85% | 2762 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,667 psi | 90% | 2782 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,985 psi | 89% | 2789 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 56,188 psi | 88% | 2776 fps | 99.5% |
| IMR 4350 | <<locked>> | 94% | 55,738 psi | 87% | 2815 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 56,695 psi | 89% | 2808 fps | 99.5% |
| IMR 4831 | <<locked>> | 94% | 54,636 psi | 86% | 2822 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 56,362 psi | 88% | 2828 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 54,868 psi | 86% | 2802 fps | 96.9% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 50,343 psi | 79% | 2835 fps | 96.5% |
| Lovex D073.6 | <<locked>> | 82% | 56,739 psi | 89% | 2772 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 55,274 psi | 87% | 2726 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 57,246 psi | 90% | 2782 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 56,710 psi | 89% | 2805 fps | 99.9% |
| Lovex S070 | <<locked>> | 92% | 54,505 psi | 85% | 2795 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,120 psi | 68% | 2638 fps | 98.6% |
| Norma 201 | <<locked>> | 82% | 55,042 psi | 86% | 2743 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,782 psi | 87% | 2740 fps | 100% |
| Norma 203B | <<locked>> | 84% | 54,259 psi | 85% | 2785 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,724 psi | 89% | 2871 fps | 98.6% |
| Norma MRPᴾ | <<locked>> | 100% | 54,708 psi | 86% | 2946 fps | 99.6% |
| Norma URP | <<locked>> | 94% | 56,608 psi | 89% | 2867 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,882 psi | 86% | 2812 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 50,488 psi | 79% | 2848 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 94% | 55,434 psi | 87% | 2871 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,947 psi | 70% | 2726 fps | 97.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,999 psi | 58% | 1759 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,927 psi | 88% | 2799 fps | 99.7% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,999 psi | 88% | 2867 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,796 psi | 87% | 2900 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,012 psi | 85% | 2854 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 56,463 psi | 88% | 2940 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,379 psi | 65% | 2743 fps | 97.4% |
| Rottweil R 902 | <<locked>> | 84% | 55,869 psi | 88% | 2746 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 55,579 psi | 87% | 2792 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 57,116 psi | 90% | 2844 fps | 97.8% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 57,232 psi | 90% | 2900 fps | 99% |
| Rottweil R 907 | <<locked>> | 90% | 55,042 psi | 86% | 2782 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 92% | 56,710 psi | 89% | 2805 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,739 psi | 89% | 2772 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 57,246 psi | 90% | 2782 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 54,505 psi | 85% | 2795 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 57,246 psi | 90% | 2851 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 57,653 psi | 90% | 2808 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,810 psi | 86% | 2772 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,912 psi | 88% | 2671 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,797 psi | 89% | 2674 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 56,594 psi | 89% | 2762 fps | 99.5% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,739 psi | 89% | 2894 fps | 98.9% |
| Somchem S335 | <<locked>> | 82% | 55,564 psi | 87% | 2671 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 57,261 psi | 90% | 2792 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 55,492 psi | 87% | 2785 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,230 psi | 87% | 2782 fps | 96.7% |
| Somchem S365 | <<locked>> | 96% | 55,840 psi | 88% | 2867 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 54,389 psi | 85% | 2825 fps | 99.1% |
| Vihtavuori N133 | <<locked>> | 82% | 56,391 psi | 88% | 2651 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 56,115 psi | 88% | 2700 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 56,362 psi | 88% | 2720 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 57,000 psi | 89% | 2762 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 55,201 psi | 87% | 2808 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,198 psi | 79% | 2746 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 84% | 54,404 psi | 85% | 2717 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,215 psi | 85% | 2815 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 54,665 psi | 86% | 2874 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,114 psi | 86% | 2933 fps | 97.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,723 psi | 86% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 56,608 psi | 89% | 2884 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,859 psi | 69% | 2854 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,752 psi | 86% | 2779 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,447 psi | 85% | 2818 fps | 98.4% |
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% | 50,183 psi | 79% | 2625 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,236 psi | 68% | 2539 fps | 96.9% |
| Accurate 3100 | <<locked>> | 86% | 32,329 psi | 51% | 2408 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 47,529 psi | 74% | 2635 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,940 psi | 56% | 2503 fps | 98.3% |
| ADI AR 2206H | <<locked>> | 80% | 52,823 psi | 83% | 2749 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,962 psi | 70% | 2612 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 90% | 42,757 psi | 67% | 2654 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 96% | 46,267 psi | 73% | 2746 fps | 95.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 49,313 psi | 77% | 2815 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 45,426 psi | 71% | 2635 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 48,370 psi | 76% | 2697 fps | 100% |
| Alliant Reloder-16 | 63.9 gr | 80% | 35,244 psi | 55% | 2516 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,885 psi | 63% | 2638 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 39,639 psi | 62% | 2592 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 92% | 39,624 psi | 62% | 2638 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,817 psi | 40% | 2280 fps | 96.2% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,183 psi | 49% | 2451 fps | 95.3% |
| Alliant Reloder-26 | 72.3 gr | 82% | 29,269 psi | 46% | 2441 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 52,576 psi | 82% | 2766 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 41,597 psi | 65% | 2677 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 45,672 psi | 72% | 2648 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 39,624 psi | 62% | 2638 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 40,248 psi | 63% | 2520 fps | 96.3% |
| Hodgdon H380 | <<locked>> | 80% | 46,050 psi | 72% | 2657 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 80% | 38,058 psi | 60% | 2552 fps | 96.4% |
| Hodgdon H4350 | <<locked>> | 80% | 41,060 psi | 64% | 2572 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 96% | 49,545 psi | 78% | 2753 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 96% | 48,573 psi | 76% | 2736 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 53,432 psi | 84% | 2759 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,822 psi | 51% | 2415 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,169 psi | 79% | 2746 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 39,117 psi | 61% | 2690 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 36,956 psi | 58% | 2559 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,108 psi | 42% | 1532 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,111 psi | 80% | 2710 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 54,041 psi | 85% | 2733 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 47,297 psi | 74% | 2641 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 49,603 psi | 78% | 2671 fps | 98.8% |
| IMR 4350 | <<locked>> | 80% | 35,998 psi | 56% | 2451 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,742 psi | 65% | 2552 fps | 97.2% |
| IMR 4831 | <<locked>> | 80% | 34,693 psi | 54% | 2461 fps | 98.1% |
| IMR 4895 | <<locked>> | 80% | 49,632 psi | 78% | 2726 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 48,385 psi | 76% | 2697 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 98% | 47,224 psi | 74% | 2779 fps | 95.7% |
| Lovex D073.6 | <<locked>> | 80% | 53,084 psi | 83% | 2723 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 52,069 psi | 82% | 2677 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,601 psi | 75% | 2641 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,204 psi | 61% | 2503 fps | 97.9% |
| Lovex S070 | <<locked>> | 80% | 37,391 psi | 59% | 2484 fps | 96.3% |
| Lovex S071 | <<locked>> | 90% | 31,270 psi | 49% | 2385 fps | 95% |
| Norma 201 | <<locked>> | 80% | 51,779 psi | 81% | 2694 fps | 100% |
| Norma 202 | <<locked>> | 80% | 52,417 psi | 82% | 2694 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,747 psi | 75% | 2684 fps | 100% |
| Norma 204 | <<locked>> | 84% | 40,451 psi | 63% | 2585 fps | 95% |
| Norma MRP | <<locked>> | 88% | 36,376 psi | 57% | 2595 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 35,868 psi | 56% | 2500 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 80% | 47,950 psi | 75% | 2707 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 43,830 psi | 69% | 2723 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 34,824 psi | 55% | 2490 fps | 96.2% |
| Ramshot Magnum | <<locked>> | 96% | 38,856 psi | 61% | 2605 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,557 psi | 43% | 1568 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,108 psi | 72% | 2641 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 52,301 psi | 82% | 2815 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 42,395 psi | 66% | 2690 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,694 psi | 56% | 2523 fps | 98% |
| ReloadSwiss RS 70 | 69.9 gr | 80% | 34,809 psi | 55% | 2526 fps | 97.3% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 36,085 psi | 57% | 2612 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 49,371 psi | 77% | 2651 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,902 psi | 67% | 2592 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 44,251 psi | 69% | 2631 fps | 95% |
| Rottweil R 905 | <<locked>> | 90% | 41,220 psi | 65% | 2628 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 40,248 psi | 63% | 2520 fps | 96.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,204 psi | 61% | 2503 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 53,084 psi | 83% | 2723 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,601 psi | 75% | 2641 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 37,391 psi | 59% | 2484 fps | 96.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,005 psi | 69% | 2644 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,780 psi | 84% | 2753 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 51,387 psi | 81% | 2723 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,707 psi | 83% | 2628 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 44,469 psi | 70% | 2503 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,377 psi | 60% | 2451 fps | 96.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 40,828 psi | 64% | 2621 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 52,330 psi | 82% | 2625 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 53,461 psi | 84% | 2740 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 43,323 psi | 68% | 2592 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 48,370 psi | 76% | 2674 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 32,416 psi | 51% | 2461 fps | 99.7% |
| Somchem S385 | <<locked>> | 86% | 36,724 psi | 58% | 2503 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 80% | 53,214 psi | 83% | 2612 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 49,559 psi | 78% | 2615 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,661 psi | 78% | 2625 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,278 psi | 65% | 2523 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 37,246 psi | 58% | 2500 fps | 98.5% |
| Vihtavuori N165 | <<locked>> | 92% | 38,551 psi | 60% | 2533 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 48,008 psi | 75% | 2625 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,825 psi | 58% | 2503 fps | 98.2% |
| Vihtavuori N555 | <<locked>> | 80% | 28,239 psi | 44% | 2356 fps | 96.4% |
| Vihtavuori N560 | <<locked>> | 96% | 48,196 psi | 76% | 2815 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 36,448 psi | 57% | 2474 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 38,058 psi | 60% | 2552 fps | 96.4% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,308 psi | 38% | 2306 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 51,343 psi | 80% | 2730 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 41,321 psi | 65% | 2595 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 105 powders for .340 Weath. Mag. loaded with the .338 | 225gr | Sierra Pro-Hunter. Alliant Reloder-26 delivers the highest muzzle velocity at 2,992 fps; across all powders the maximum-charge window runs from 1,719 fps to 2,992 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 225.0 gr projectile in 0.338" calls for a 1:15.5 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 70, Alliant Reloder-26, Alliant Reloder-16 rank at the top here: for .340 Weath. Mag. with the .338 | 225gr | Sierra Pro-Hunter 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.