Load Specifications
Bullet:.338 | 225gr | Speer TBBC
Bullet Manufacturer:Speer
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:1:15.0
Load data in caliber .340 Weath. Mag. with .338 | 225gr | Speer TBBC bullet and 108 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.
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% | 56,420 psi | 88% | 2703 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,143 psi | 85% | 2726 fps | 98.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,024 psi | 80% | 2762 fps | 99.5% |
| Accurate 4064 | <<locked>> | 86% | 56,710 psi | 89% | 2759 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 57,348 psi | 90% | 2871 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 55,680 psi | 87% | 2959 fps | 97.9% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 52,852 psi | 83% | 2897 fps | 96% |
| ADI AR 2206H | <<locked>> | 82% | 55,637 psi | 87% | 2785 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,826 psi | 89% | 2792 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,607 psi | 86% | 2858 fps | 98.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 52,170 psi | 82% | 2844 fps | 96.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,086 psi | 88% | 2917 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 54,534 psi | 85% | 2854 fps | 98.4% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 54,534 psi | 85% | 2854 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,493 psi | 90% | 2812 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,462 psi | 85% | 2789 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,711 psi | 90% | 2920 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,535 psi | 87% | 2894 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 57,232 psi | 90% | 2900 fps | 98.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,778 psi | 80% | 2844 fps | 98% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,022 psi | 75% | 2785 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,916 psi | 66% | 2710 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,853 psi | 86% | 2972 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,651 psi | 87% | 2808 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,499 psi | 73% | 2769 fps | 97% |
| Bofors RP3 | <<locked>> | 86% | 54,781 psi | 86% | 2782 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,778 psi | 80% | 2844 fps | 98% |
| Bofors RP7 | <<locked>> | 90% | 54,418 psi | 85% | 2769 fps | 99% |
| Hodgdon H380 | <<locked>> | 86% | 55,347 psi | 87% | 2799 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 55,782 psi | 87% | 2867 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 90% | 55,695 psi | 87% | 2828 fps | 98.7% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 55,912 psi | 88% | 2851 fps | 96.8% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 54,781 psi | 86% | 2831 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 82% | 56,304 psi | 88% | 2795 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,389 psi | 85% | 2792 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,536 psi | 89% | 2835 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,854 psi | 88% | 2907 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,274 psi | 57% | 1709 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 57,319 psi | 90% | 2795 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 57,029 psi | 89% | 2769 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,289 psi | 88% | 2776 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,564 psi | 87% | 2759 fps | 99.4% |
| IMR 4350 | <<locked>> | 94% | 55,027 psi | 86% | 2799 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,941 psi | 88% | 2795 fps | 99.4% |
| IMR 4831 | <<locked>> | 96% | 57,537 psi | 90% | 2858 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,898 psi | 88% | 2818 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,682 psi | 90% | 2838 fps | 97.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 49,690 psi | 78% | 2818 fps | 96.3% |
| Lovex D073.6 | <<locked>> | 82% | 56,202 psi | 88% | 2759 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,621 psi | 86% | 2710 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 56,521 psi | 89% | 2769 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,941 psi | 88% | 2789 fps | 99.9% |
| Lovex S070 | <<locked>> | 94% | 57,159 psi | 90% | 2831 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,438 psi | 67% | 2621 fps | 98.4% |
| Norma 201 | <<locked>> | 82% | 54,534 psi | 85% | 2730 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,274 psi | 87% | 2726 fps | 100% |
| Norma 203B | <<locked>> | 86% | 57,174 psi | 90% | 2825 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,709 psi | 87% | 2851 fps | 98.4% |
| Norma MRPᴾ | <<locked>> | 100% | 53,766 psi | 84% | 2927 fps | 99.4% |
| Norma URP | <<locked>> | 94% | 55,738 psi | 87% | 2851 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,273 psi | 85% | 2802 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 49,647 psi | 78% | 2828 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 94% | 54,476 psi | 85% | 2854 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 44,193 psi | 69% | 2707 fps | 97.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,883 psi | 58% | 1752 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,332 psi | 87% | 2785 fps | 99.7% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,216 psi | 87% | 2854 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,100 psi | 86% | 2887 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,956 psi | 89% | 2890 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,535 psi | 87% | 2920 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 40,785 psi | 64% | 2723 fps | 97.1% |
| Rottweil R 902 | <<locked>> | 84% | 55,114 psi | 86% | 2730 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,810 psi | 86% | 2776 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,405 psi | 88% | 2828 fps | 97.6% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,507 psi | 89% | 2887 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 90% | 54,418 psi | 85% | 2769 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,941 psi | 88% | 2789 fps | 99.9% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,202 psi | 88% | 2759 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 56,521 psi | 89% | 2769 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 57,159 psi | 90% | 2831 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,376 psi | 88% | 2838 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 57,029 psi | 89% | 2795 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,143 psi | 85% | 2759 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,361 psi | 87% | 2661 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,159 psi | 88% | 2661 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,767 psi | 87% | 2743 fps | 99.4% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,999 psi | 88% | 2881 fps | 98.7% |
| Somchem S335 | <<locked>> | 82% | 55,071 psi | 86% | 2657 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,637 psi | 89% | 2779 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,824 psi | 86% | 2772 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 54,404 psi | 85% | 2766 fps | 96.4% |
| Somchem S365 | <<locked>> | 96% | 54,926 psi | 86% | 2854 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,159 psi | 90% | 2858 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 82% | 55,840 psi | 88% | 2641 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,492 psi | 87% | 2690 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,695 psi | 87% | 2707 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 56,173 psi | 88% | 2746 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,404 psi | 85% | 2792 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,327 psi | 77% | 2726 fps | 98% |
| Vihtavuori N540 | <<locked>> | 86% | 57,363 psi | 90% | 2753 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,087 psi | 89% | 2851 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,621 psi | 84% | 2858 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 54,230 psi | 85% | 2917 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,041 psi | 85% | 2766 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,999 psi | 88% | 2871 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,250 psi | 68% | 2838 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,099 psi | 85% | 2766 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,751 psi | 84% | 2802 fps | 98.2% |
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% | 49,545 psi | 78% | 2615 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,500 psi | 74% | 2618 fps | 97.7% |
| Accurate 3100 | <<locked>> | 86% | 31,792 psi | 50% | 2392 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 46,949 psi | 74% | 2621 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,462 psi | 56% | 2490 fps | 98.1% |
| Accurate High Country | <<locked>> | 94% | 45,237 psi | 71% | 2782 fps | 95.7% |
| Accurate MAGPRO | <<locked>> | 98% | 49,298 psi | 77% | 2838 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 52,330 psi | 82% | 2736 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,483 psi | 70% | 2598 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 90% | 42,090 psi | 66% | 2635 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 96% | 45,672 psi | 72% | 2730 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,675 psi | 76% | 2802 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 42,148 psi | 66% | 2638 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 42,148 psi | 66% | 2638 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,918 psi | 70% | 2621 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,877 psi | 75% | 2687 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,824 psi | 55% | 2500 fps | 98.2% |
| Alliant Reloder-17 | 68 gr | 80% | 39,305 psi | 62% | 2625 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 41,669 psi | 65% | 2628 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 41,698 psi | 65% | 2677 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,483 psi | 40% | 2267 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 92% | 32,590 psi | 51% | 2484 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 82% | 28,834 psi | 45% | 2425 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,953 psi | 81% | 2753 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 40,944 psi | 64% | 2657 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 44,991 psi | 71% | 2631 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 41,698 psi | 65% | 2677 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 39,784 psi | 62% | 2507 fps | 96.1% |
| Hodgdon H380 | <<locked>> | 80% | 45,411 psi | 71% | 2641 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 37,449 psi | 59% | 2536 fps | 96.1% |
| Hodgdon H4350 | <<locked>> | 80% | 40,466 psi | 63% | 2556 fps | 95.5% |
| Hodgdon H4831 | <<locked>> | 96% | 48,907 psi | 77% | 2736 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 96% | 47,935 psi | 75% | 2720 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 52,881 psi | 83% | 2746 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,343 psi | 51% | 2398 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,443 psi | 77% | 2730 fps | 100% |
| Hodgdon Superformance | <<locked>> | 80% | 36,463 psi | 57% | 2543 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,035 psi | 42% | 1526 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,589 psi | 79% | 2697 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 53,403 psi | 84% | 2723 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,789 psi | 73% | 2628 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,965 psi | 77% | 2654 fps | 98.6% |
| IMR 4350 | <<locked>> | 82% | 37,913 psi | 59% | 2490 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,162 psi | 65% | 2536 fps | 97% |
| IMR 4831 | <<locked>> | 80% | 34,229 psi | 54% | 2448 fps | 97.9% |
| IMR 4895 | <<locked>> | 80% | 49,081 psi | 77% | 2713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 47,761 psi | 75% | 2680 fps | 95.2% |
| IMR 7828 SSC | <<locked>> | 98% | 46,383 psi | 73% | 2756 fps | 95.3% |
| Lovex D073.6 | <<locked>> | 80% | 52,518 psi | 82% | 2710 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,590 psi | 81% | 2664 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 47,065 psi | 74% | 2628 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,769 psi | 61% | 2490 fps | 97.7% |
| Lovex S070 | <<locked>> | 80% | 36,970 psi | 58% | 2470 fps | 96.1% |
| Lovex S071 | <<locked>> | 92% | 32,880 psi | 52% | 2421 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 51,213 psi | 80% | 2684 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,895 psi | 81% | 2680 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,224 psi | 74% | 2674 fps | 100% |
| Norma 204 | <<locked>> | 86% | 42,569 psi | 67% | 2625 fps | 95.6% |
| Norma MRP | <<locked>> | 88% | 35,766 psi | 56% | 2575 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 35,404 psi | 55% | 2487 fps | 98% |
| Ramshot Big Game | <<locked>> | 80% | 47,282 psi | 74% | 2694 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 46,412 psi | 73% | 2769 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 34,287 psi | 54% | 2474 fps | 95.9% |
| Ramshot Magnum | <<locked>> | 96% | 38,377 psi | 60% | 2589 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,644 psi | 43% | 1565 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,498 psi | 71% | 2625 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,532 psi | 81% | 2799 fps | 100% |
| ReloadSwiss RS 60 | 68 gr | 80% | 41,771 psi | 65% | 2677 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,099 psi | 55% | 2507 fps | 97.8% |
| ReloadSwiss RS 70 | 69 gr | 80% | 34,316 psi | 54% | 2513 fps | 97.1% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 37,913 psi | 59% | 2654 fps | 95.9% |
| Rottweil R 902 | <<locked>> | 80% | 48,849 psi | 77% | 2638 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,366 psi | 66% | 2579 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 46,586 psi | 73% | 2667 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 90% | 40,683 psi | 64% | 2612 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 39,784 psi | 62% | 2507 fps | 96.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,769 psi | 61% | 2490 fps | 97.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,518 psi | 82% | 2710 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 47,065 psi | 74% | 2628 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,970 psi | 58% | 2470 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,337 psi | 68% | 2631 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 53,185 psi | 83% | 2740 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,749 psi | 80% | 2710 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,141 psi | 82% | 2615 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,947 psi | 69% | 2490 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,000 psi | 60% | 2438 fps | 96.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 40,292 psi | 63% | 2608 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 51,837 psi | 81% | 2615 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,823 psi | 83% | 2726 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,786 psi | 67% | 2579 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 50,966 psi | 80% | 2710 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 31,952 psi | 50% | 2448 fps | 99.6% |
| Somchem S385 | <<locked>> | 88% | 38,725 psi | 61% | 2543 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 52,649 psi | 83% | 2598 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,950 psi | 77% | 2602 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,124 psi | 77% | 2615 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,843 psi | 64% | 2513 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,796 psi | 58% | 2487 fps | 98.3% |
| Vihtavuori N165 | <<locked>> | 92% | 37,942 psi | 59% | 2516 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 47,384 psi | 74% | 2612 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,245 psi | 57% | 2487 fps | 98% |
| Vihtavuori N555 | <<locked>> | 80% | 27,702 psi | 43% | 2336 fps | 96% |
| Vihtavuori N560 | <<locked>> | 96% | 47,529 psi | 74% | 2799 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,969 psi | 56% | 2457 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 37,623 psi | 59% | 2539 fps | 96.2% |
| Winchester StaBALL HD | <<locked>> | 82% | 23,960 psi | 38% | 2287 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,662 psi | 79% | 2717 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 40,669 psi | 64% | 2575 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 108 powders for .340 Weath. Mag. loaded with the .338 | 225gr | Speer TBBC. Alliant Reloder-26 delivers the highest muzzle velocity at 2,972 fps; across all powders the maximum-charge window runs from 1,709 fps to 2,972 fps. Accurate 3100 gives the best case fill at 100 %, and 108 of the 108 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 1:15.0 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. ReloadSwiss RS 70, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .340 Weath. Mag. with the .338 | 225gr | Speer TBBC 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.