Load Specifications
Load data in caliber 8.5 mm Messner Mag. with .338 | 240gr | Lehigh Defense Match Solid bullet and 99 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% | 54,766 psi | 86% | 2602 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,318 psi | 88% | 2684 fps | 99.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 53,896 psi | 84% | 2730 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 55,274 psi | 87% | 2657 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,333 psi | 88% | 2776 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 56,289 psi | 88% | 2881 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 86% | 55,695 psi | 87% | 2697 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,377 psi | 90% | 2825 fps | 99.3% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,056 psi | 86% | 2828 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 34,867 psi | 55% | 2493 fps | 96.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,158 psi | 86% | 2818 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,376 psi | 88% | 2717 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,811 psi | 89% | 2740 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 57,232 psi | 90% | 2828 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 54,752 psi | 86% | 2799 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 56,739 psi | 89% | 2815 fps | 99.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 53,911 psi | 84% | 2822 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 50,792 psi | 80% | 2746 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,019 psi | 69% | 2687 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 54,404 psi | 85% | 2884 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,269 psi | 77% | 2746 fps | 98.4% |
| Bofors RP3 | <<locked>> | 86% | 57,159 psi | 90% | 2733 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 53,911 psi | 84% | 2822 fps | 99.2% |
| Bofors RP7 | <<locked>> | 90% | 56,637 psi | 89% | 2726 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 43,888 psi | 69% | 2628 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 86% | 57,696 psi | 90% | 2756 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 55,042 psi | 86% | 2779 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 88% | 54,795 psi | 86% | 2740 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 98% | 55,042 psi | 86% | 2769 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 53,925 psi | 85% | 2753 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 57,566 psi | 90% | 2749 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,477 psi | 87% | 2736 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,120 psi | 68% | 2723 fps | 98% |
| Hodgdon Superformance | <<locked>> | 90% | 55,085 psi | 86% | 2818 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,463 psi | 57% | 1663 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 56,130 psi | 88% | 2697 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 55,085 psi | 86% | 2677 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 54,302 psi | 85% | 2667 fps | 99.7% |
| IMR 4350 | <<locked>> | 92% | 54,288 psi | 85% | 2713 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 55,042 psi | 86% | 2707 fps | 99.7% |
| IMR 4831 | <<locked>> | 94% | 56,724 psi | 89% | 2766 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,534 psi | 85% | 2717 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,681 psi | 89% | 2756 fps | 98% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,272 psi | 82% | 2795 fps | 97.9% |
| Lovex S060 | <<locked>> | 82% | 56,695 psi | 89% | 2661 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,274 psi | 87% | 2671 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,737 psi | 86% | 2697 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 56,246 psi | 88% | 2743 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,730 psi | 70% | 2592 fps | 99.4% |
| Norma 201 | <<locked>> | 82% | 56,550 psi | 89% | 2680 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,290 psi | 90% | 2671 fps | 100% |
| Norma 203B | <<locked>> | 84% | 56,072 psi | 88% | 2726 fps | 100% |
| Norma 204 | <<locked>> | 92% | 54,897 psi | 86% | 2766 fps | 99% |
| Norma MRPᴾ | <<locked>> | 100% | 57,276 psi | 90% | 2900 fps | 100% |
| Norma URP | <<locked>> | 92% | 55,143 psi | 86% | 2762 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 56,869 psi | 89% | 2753 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 52,649 psi | 83% | 2812 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 94% | 57,537 psi | 90% | 2818 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 46,804 psi | 73% | 2694 fps | 98.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,057 psi | 58% | 1703 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,667 psi | 90% | 2743 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,317 psi | 85% | 2789 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 56,333 psi | 88% | 2802 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 54,853 psi | 86% | 2831 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,946 psi | 67% | 2717 fps | 98.9% |
| Rottweil R 902 | <<locked>> | 84% | 57,174 psi | 90% | 2677 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,232 psi | 90% | 2726 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,419 psi | 87% | 2743 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 98% | 55,999 psi | 88% | 2802 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 90% | 56,637 psi | 89% | 2726 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,737 psi | 86% | 2697 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 55,274 psi | 87% | 2671 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,246 psi | 88% | 2743 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,550 psi | 87% | 2743 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,434 psi | 88% | 2713 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,435 psi | 90% | 2605 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,984 psi | 86% | 2569 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,476 psi | 85% | 2654 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,521 psi | 87% | 2799 fps | 99.3% |
| Somchem S335 | <<locked>> | 82% | 57,087 psi | 89% | 2605 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,334 psi | 90% | 2726 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 57,116 psi | 90% | 2736 fps | 97.9% |
| Somchem S365 | <<locked>> | 94% | 54,418 psi | 85% | 2759 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,362 psi | 88% | 2772 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 84% | 57,653 psi | 90% | 2631 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,476 psi | 85% | 2608 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,013 psi | 86% | 2651 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 57,305 psi | 90% | 2753 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,185 psi | 82% | 2700 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 84% | 55,970 psi | 88% | 2651 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 56,188 psi | 88% | 2759 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 56,869 psi | 89% | 2818 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 57,551 psi | 90% | 2894 fps | 98.4% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 45,498 psi | 71% | 2690 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 57,014 psi | 89% | 2720 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,042 psi | 86% | 2779 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 45,701 psi | 72% | 2808 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,739 psi | 89% | 2720 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 56,913 psi | 89% | 2776 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% | 51,256 psi | 80% | 2559 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,327 psi | 77% | 2582 fps | 98.8% |
| Accurate 3100 | <<locked>> | 82% | 28,819 psi | 45% | 2257 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 48,631 psi | 76% | 2569 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 37,057 psi | 58% | 2457 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 94% | 45,339 psi | 71% | 2700 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 46,296 psi | 73% | 2556 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 38,667 psi | 61% | 2500 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 92% | 42,003 psi | 66% | 2595 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 98% | 32,779 psi | 51% | 2438 fps | 95.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,213 psi | 80% | 2762 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,644 psi | 73% | 2575 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,879 psi | 78% | 2641 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,361 psi | 57% | 2470 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,249 psi | 65% | 2589 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 38,377 psi | 60% | 2497 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 35,911 psi | 56% | 2487 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,382 psi | 41% | 2244 fps | 97.6% |
| Alliant Reloder-25 | <<locked>> | 88% | 29,950 psi | 47% | 2356 fps | 96% |
| Alliant Reloder-26 | 70.1 gr | 80% | 28,050 psi | 44% | 2346 fps | 96% |
| Bofors RP15 | <<locked>> | 92% | 37,985 psi | 60% | 2533 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 46,862 psi | 73% | 2585 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 35,911 psi | 56% | 2487 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 41,278 psi | 65% | 2474 fps | 97.5% |
| Hodgdon H1000 | <<locked>> | 98% | 40,901 psi | 64% | 2566 fps | 95.6% |
| Hodgdon H380 | <<locked>> | 80% | 47,297 psi | 74% | 2602 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 39,218 psi | 61% | 2507 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 80% | 42,250 psi | 66% | 2526 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 92% | 44,991 psi | 71% | 2605 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 44,106 psi | 69% | 2585 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,852 psi | 53% | 2369 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,837 psi | 81% | 2684 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 35,462 psi | 56% | 2539 fps | 95% |
| Hodgdon Superformance | 72.3 gr | 80% | 38,116 psi | 60% | 2520 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,195 psi | 43% | 1486 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,736 psi | 83% | 2651 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,689 psi | 76% | 2585 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,865 psi | 80% | 2615 fps | 99.4% |
| IMR 4350 | <<locked>> | 80% | 36,941 psi | 58% | 2405 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,786 psi | 67% | 2503 fps | 98.2% |
| IMR 4831 | <<locked>> | 80% | 35,766 psi | 56% | 2415 fps | 99% |
| IMR 4895 | <<locked>> | 80% | 51,184 psi | 80% | 2667 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 44,019 psi | 69% | 2549 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 94% | 42,728 psi | 67% | 2625 fps | 95.5% |
| Lovex S060 | <<locked>> | 80% | 53,287 psi | 84% | 2615 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,733 psi | 76% | 2575 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,176 psi | 63% | 2454 fps | 98.8% |
| Lovex S070 | <<locked>> | 80% | 38,377 psi | 60% | 2438 fps | 97.5% |
| Lovex S071 | <<locked>> | 88% | 30,095 psi | 47% | 2290 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 53,084 psi | 83% | 2631 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,780 psi | 84% | 2625 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,240 psi | 77% | 2628 fps | 100% |
| Norma 204 | <<locked>> | 82% | 38,957 psi | 61% | 2487 fps | 95.6% |
| Norma MRP | <<locked>> | 84% | 32,634 psi | 51% | 2434 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 37,043 psi | 58% | 2454 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 80% | 49,559 psi | 78% | 2651 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 42,511 psi | 67% | 2631 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 35,868 psi | 56% | 2444 fps | 97.5% |
| Ramshot Magnum | <<locked>> | 92% | 34,896 psi | 55% | 2454 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,644 psi | 43% | 1522 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,340 psi | 74% | 2589 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,932 psi | 69% | 2635 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,898 psi | 58% | 2477 fps | 99% |
| ReloadSwiss RS 70 | 69.4 gr | 80% | 35,810 psi | 56% | 2487 fps | 98.5% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 34,664 psi | 54% | 2520 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 50,618 psi | 79% | 2589 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,135 psi | 69% | 2536 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 42,888 psi | 67% | 2533 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 86% | 37,246 psi | 58% | 2474 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 41,278 psi | 65% | 2474 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,176 psi | 63% | 2454 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 48,733 psi | 76% | 2575 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,377 psi | 60% | 2438 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,382 psi | 71% | 2592 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,881 psi | 83% | 2664 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,853 psi | 84% | 2559 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,498 psi | 71% | 2441 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,204 psi | 61% | 2402 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 36,912 psi | 58% | 2470 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 53,679 psi | 84% | 2562 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,527 psi | 70% | 2536 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 43,743 psi | 69% | 2523 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 33,388 psi | 52% | 2411 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 35,433 psi | 56% | 2408 fps | 95.8% |
| Vihtavuori N135 | <<locked>> | 80% | 50,807 psi | 80% | 2546 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 51,169 psi | 80% | 2566 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,482 psi | 67% | 2470 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,464 psi | 60% | 2454 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 34,896 psi | 55% | 2388 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 49,284 psi | 77% | 2562 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,826 psi | 59% | 2457 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 29,008 psi | 45% | 2310 fps | 97.6% |
| Vihtavuori N560 | <<locked>> | 92% | 43,671 psi | 68% | 2657 fps | 95.4% |
| Vihtavuori N565 | <<locked>> | 98% | 42,395 psi | 66% | 2631 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,608 psi | 59% | 2425 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 39,392 psi | 62% | 2510 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,105 psi | 36% | 2215 fps | 96.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,895 psi | 83% | 2671 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 37,159 psi | 58% | 2444 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 99 powders for 8.5 mm Messner Mag. loaded with the .338 | 240gr | Lehigh Defense Match Solid. Norma MRP delivers the highest muzzle velocity at 2,900 fps; across all powders the maximum-charge window runs from 1,663 fps to 2,900 fps. Accurate 3100 gives the best case fill at 100 %, and 99 of the 99 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 240.0 gr projectile in 0.338" calls for a 1:10.5 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 | 240gr | Lehigh Defense Match Solid 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.