Load Specifications
Load data in caliber 8.5 mm Messner Mag. with .338 | 245gr | Lehigh Defense Match Solid bullet and 100 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 Hodgdon Superformance.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 54,534 psi | 85% | 2566 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,159 psi | 88% | 2651 fps | 99.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,635 psi | 84% | 2694 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 55,143 psi | 86% | 2625 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,057 psi | 88% | 2736 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 55,985 psi | 88% | 2841 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 86% | 55,579 psi | 87% | 2661 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,305 psi | 90% | 2792 fps | 99.4% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 54,868 psi | 86% | 2789 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 34,722 psi | 54% | 2464 fps | 96.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,955 psi | 86% | 2782 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,333 psi | 88% | 2680 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,521 psi | 89% | 2703 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,956 psi | 89% | 2789 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,505 psi | 85% | 2762 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,463 psi | 88% | 2779 fps | 99.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,679 psi | 84% | 2785 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,705 psi | 79% | 2713 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,976 psi | 69% | 2654 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,273 psi | 85% | 2848 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,037 psi | 77% | 2713 fps | 98.5% |
| Bofors RP3 | <<locked>> | 86% | 57,174 psi | 90% | 2697 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,679 psi | 84% | 2785 fps | 99.2% |
| Bofors RP7 | <<locked>> | 90% | 56,507 psi | 89% | 2694 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 43,685 psi | 68% | 2595 fps | 96.7% |
| Hodgdon H380 | <<locked>> | 86% | 57,522 psi | 90% | 2720 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 54,766 psi | 86% | 2743 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 88% | 54,679 psi | 86% | 2703 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 98% | 55,013 psi | 86% | 2736 fps | 97.7% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 57,638 psi | 90% | 2772 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,290 psi | 90% | 2713 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,201 psi | 87% | 2697 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,931 psi | 67% | 2687 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 90% | 54,853 psi | 86% | 2782 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,347 psi | 57% | 1637 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,999 psi | 88% | 2661 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,955 psi | 86% | 2641 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,740 psi | 90% | 2684 fps | 99.9% |
| IMR 4350 | <<locked>> | 94% | 57,537 psi | 90% | 2726 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,868 psi | 86% | 2671 fps | 99.8% |
| IMR 4831 | <<locked>> | 94% | 56,478 psi | 89% | 2730 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,404 psi | 85% | 2680 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,608 psi | 89% | 2723 fps | 98.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,054 psi | 82% | 2759 fps | 98% |
| Lovex S060 | <<locked>> | 82% | 56,492 psi | 89% | 2625 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,129 psi | 86% | 2635 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,578 psi | 86% | 2661 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 55,956 psi | 88% | 2707 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,570 psi | 70% | 2559 fps | 99.4% |
| Norma 201 | <<locked>> | 82% | 56,347 psi | 88% | 2641 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,101 psi | 89% | 2635 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,767 psi | 87% | 2690 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,679 psi | 86% | 2730 fps | 99% |
| Norma MRPᴾ | <<locked>> | 100% | 57,159 psi | 90% | 2864 fps | 100% |
| Norma URP | <<locked>> | 92% | 54,824 psi | 86% | 2723 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,753 psi | 89% | 2717 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,533 psi | 82% | 2779 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 94% | 57,174 psi | 90% | 2779 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,514 psi | 73% | 2657 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,956 psi | 58% | 1677 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,551 psi | 90% | 2707 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 57,711 psi | 90% | 2769 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,172 psi | 85% | 2753 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,956 psi | 88% | 2762 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,549 psi | 85% | 2792 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,772 psi | 67% | 2684 fps | 98.9% |
| Rottweil R 902 | <<locked>> | 84% | 57,000 psi | 89% | 2641 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,058 psi | 89% | 2690 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,259 psi | 87% | 2707 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 98% | 55,651 psi | 87% | 2762 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 90% | 56,507 psi | 89% | 2694 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,578 psi | 86% | 2661 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 55,129 psi | 86% | 2635 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,956 psi | 88% | 2707 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,172 psi | 86% | 2703 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,159 psi | 88% | 2674 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,392 psi | 90% | 2572 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,868 psi | 86% | 2533 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,375 psi | 85% | 2621 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,158 psi | 86% | 2759 fps | 99.3% |
| Somchem S335 | <<locked>> | 82% | 56,884 psi | 89% | 2569 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,130 psi | 90% | 2687 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 56,985 psi | 89% | 2703 fps | 97.9% |
| Somchem S365 | <<locked>> | 94% | 54,157 psi | 85% | 2723 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,072 psi | 88% | 2736 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 84% | 57,638 psi | 90% | 2598 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,317 psi | 85% | 2572 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,795 psi | 86% | 2615 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 57,058 psi | 89% | 2717 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 51,938 psi | 81% | 2667 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 84% | 55,970 psi | 88% | 2618 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,985 psi | 88% | 2723 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,492 psi | 89% | 2779 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,450 psi | 90% | 2858 fps | 98.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 45,339 psi | 71% | 2657 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 56,724 psi | 89% | 2684 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,984 psi | 86% | 2746 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,571 psi | 71% | 2776 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,507 psi | 89% | 2684 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,492 psi | 89% | 2736 fps | 99.3% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 51,010 psi | 80% | 2523 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,255 psi | 77% | 2549 fps | 98.9% |
| Accurate 3100 | <<locked>> | 82% | 28,732 psi | 45% | 2231 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 48,414 psi | 76% | 2533 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,883 psi | 58% | 2428 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 94% | 45,107 psi | 71% | 2664 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 46,064 psi | 72% | 2520 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 38,479 psi | 60% | 2467 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 92% | 41,800 psi | 66% | 2559 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 98% | 32,605 psi | 51% | 2405 fps | 95.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,184 psi | 80% | 2726 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,615 psi | 73% | 2543 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,719 psi | 78% | 2608 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,187 psi | 57% | 2438 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,017 psi | 64% | 2552 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 38,203 psi | 60% | 2464 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 35,824 psi | 56% | 2454 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,252 psi | 41% | 2215 fps | 97.7% |
| Alliant Reloder-25 | <<locked>> | 86% | 27,963 psi | 44% | 2274 fps | 95% |
| Alliant Reloder-26 | 68.7 gr | 80% | 27,891 psi | 44% | 2316 fps | 96.1% |
| Bofors RP15 | <<locked>> | 92% | 37,739 psi | 59% | 2497 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 46,688 psi | 73% | 2552 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 35,824 psi | 56% | 2454 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 41,089 psi | 64% | 2438 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 98% | 40,857 psi | 64% | 2536 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 47,166 psi | 74% | 2569 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 39,117 psi | 61% | 2474 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 80% | 42,119 psi | 66% | 2493 fps | 97.2% |
| Hodgdon H4831 | <<locked>> | 92% | 44,802 psi | 70% | 2569 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 43,903 psi | 69% | 2552 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,663 psi | 53% | 2336 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,750 psi | 81% | 2651 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 35,331 psi | 55% | 2507 fps | 95.2% |
| Hodgdon Superformance | 70.9 gr | 80% | 38,014 psi | 60% | 2487 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,079 psi | 42% | 1460 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,518 psi | 82% | 2615 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,472 psi | 76% | 2549 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,705 psi | 79% | 2582 fps | 99.5% |
| IMR 4350 | <<locked>> | 80% | 36,927 psi | 58% | 2379 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,757 psi | 67% | 2470 fps | 98.3% |
| IMR 4831 | <<locked>> | 80% | 35,578 psi | 56% | 2382 fps | 99% |
| IMR 4895 | <<locked>> | 80% | 50,995 psi | 80% | 2631 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 43,932 psi | 69% | 2516 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 94% | 42,583 psi | 67% | 2592 fps | 95.7% |
| Lovex S060 | <<locked>> | 80% | 53,258 psi | 83% | 2582 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,689 psi | 76% | 2546 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,001 psi | 63% | 2421 fps | 98.8% |
| Lovex S070 | <<locked>> | 80% | 38,218 psi | 60% | 2405 fps | 97.6% |
| Lovex S071 | <<locked>> | 88% | 29,994 psi | 47% | 2264 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 52,881 psi | 83% | 2595 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,780 psi | 84% | 2592 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,066 psi | 77% | 2592 fps | 100% |
| Norma 204 | <<locked>> | 82% | 38,740 psi | 61% | 2454 fps | 95.7% |
| Norma MRP | <<locked>> | 84% | 32,503 psi | 51% | 2405 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 36,869 psi | 58% | 2421 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 80% | 49,501 psi | 78% | 2618 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 39,450 psi | 62% | 2539 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 35,752 psi | 56% | 2415 fps | 97.6% |
| Ramshot Magnum | <<locked>> | 92% | 34,795 psi | 55% | 2425 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,702 psi | 43% | 1499 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,268 psi | 74% | 2556 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 53,998 psi | 85% | 2720 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,642 psi | 68% | 2598 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,811 psi | 58% | 2448 fps | 99% |
| ReloadSwiss RS 70 | 68.1 gr | 80% | 35,795 psi | 56% | 2457 fps | 98.6% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 34,534 psi | 54% | 2490 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 80% | 50,357 psi | 79% | 2552 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,918 psi | 69% | 2500 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 42,714 psi | 67% | 2500 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 86% | 37,217 psi | 58% | 2448 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 41,089 psi | 64% | 2438 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,001 psi | 63% | 2421 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 48,689 psi | 76% | 2546 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,218 psi | 60% | 2405 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,281 psi | 71% | 2559 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,765 psi | 83% | 2628 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,751 psi | 84% | 2526 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,397 psi | 71% | 2408 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,218 psi | 61% | 2372 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 36,869 psi | 58% | 2441 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 53,447 psi | 84% | 2526 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,280 psi | 69% | 2500 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 43,613 psi | 68% | 2493 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 33,373 psi | 52% | 2385 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 32,982 psi | 52% | 2323 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 50,705 psi | 79% | 2510 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,923 psi | 80% | 2530 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,308 psi | 66% | 2434 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,290 psi | 60% | 2421 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 34,766 psi | 54% | 2359 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 49,168 psi | 77% | 2526 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,710 psi | 59% | 2425 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 28,950 psi | 45% | 2283 fps | 97.7% |
| Vihtavuori N560 | <<locked>> | 92% | 43,540 psi | 68% | 2628 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 98% | 42,192 psi | 66% | 2598 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,463 psi | 59% | 2395 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 39,276 psi | 62% | 2480 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,047 psi | 36% | 2188 fps | 96.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,823 psi | 83% | 2635 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 37,072 psi | 58% | 2415 fps | 95.3% |
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 106 powders for 8.5 mm Messner Mag. loaded with the .338 | 245gr | Lehigh Defense Match Solid. Norma MRP delivers the highest muzzle velocity at 2,864 fps; across all powders the maximum-charge window runs from 1,637 fps to 2,864 fps. Accurate 3100 gives the best case fill at 100 %, and 106 of the 106 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 47–90 %, leaving at least 10 % headroom. The 245.0 gr projectile in 0.338" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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, Hodgdon Superformance rank at the top here: for 8.5 mm Messner Mag. with the .338 | 245gr | Lehigh Defense Match Solid they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, Norma 217, ReloadSwiss RS 80 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.