Load Specifications
Load data in caliber 8.5 mm Messner Mag. with .338 | 225gr | Woodleigh HS bullet and 90 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Alliant Reloder-26.
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 2700 | <<locked>> | 86% | 57,537 psi | 90% | 2808 fps | 99.6% |
| Accurate 3100 | <<locked>> | 98% | 55,085 psi | 86% | 2854 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 55,898 psi | 88% | 2772 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 57,043 psi | 89% | 2894 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 54,215 psi | 85% | 2946 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 84% | 55,535 psi | 87% | 2808 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 57,711 psi | 90% | 2943 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 98% | 55,477 psi | 87% | 2946 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,218 psi | 60% | 2671 fps | 97.5% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 54,317 psi | 85% | 2887 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,623 psi | 89% | 2831 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,652 psi | 89% | 2854 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,114 psi | 85% | 2897 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,303 psi | 87% | 2913 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 57,159 psi | 90% | 2933 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,882 psi | 86% | 2943 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 55,666 psi | 87% | 2917 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,037 psi | 75% | 2861 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,970 psi | 88% | 3009 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,621 psi | 84% | 2920 fps | 99% |
| Bofors RP3 | <<locked>> | 84% | 57,537 psi | 90% | 2844 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,976 psi | 69% | 2785 fps | 96.7% |
| Bofors RP5 | <<locked>> | 98% | 54,882 psi | 86% | 2943 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 56,753 psi | 89% | 2844 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 44,353 psi | 70% | 2740 fps | 96.7% |
| Hodgdon H380 | <<locked>> | 82% | 54,099 psi | 85% | 2815 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 56,521 psi | 89% | 2913 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 90% | 56,840 psi | 89% | 2884 fps | 99.4% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 54,694 psi | 86% | 2874 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,491 psi | 85% | 2871 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,447 psi | 85% | 2818 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,811 psi | 87% | 2851 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,094 psi | 74% | 2910 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 88% | 55,477 psi | 87% | 2930 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,724 psi | 58% | 1762 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,027 psi | 86% | 2795 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,505 psi | 85% | 2782 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 56,492 psi | 89% | 2815 fps | 99.8% |
| IMR 4350 | <<locked>> | 90% | 54,433 psi | 85% | 2828 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,795 psi | 86% | 2815 fps | 99.7% |
| IMR 4831 | <<locked>> | 94% | 54,795 psi | 86% | 2848 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 56,826 psi | 89% | 2871 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 98% | 57,101 psi | 89% | 2986 fps | 98.7% |
| Lovex S062 | <<locked>> | 82% | 55,317 psi | 87% | 2782 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 55,100 psi | 86% | 2812 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 56,420 psi | 88% | 2858 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,052 psi | 77% | 2762 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 55,985 psi | 88% | 2838 fps | 100% |
| Norma 204 | <<locked>> | 90% | 55,230 psi | 87% | 2881 fps | 99% |
| Norma MRP | <<locked>> | 96% | 54,549 psi | 85% | 2966 fps | 99.8% |
| Norma URP | <<locked>> | 90% | 55,477 psi | 87% | 2874 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 56,826 psi | 89% | 2864 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,101 psi | 89% | 2995 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 90% | 54,418 psi | 85% | 2884 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 53,679 psi | 84% | 2907 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,478 psi | 59% | 1804 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 57,609 psi | 90% | 2854 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,694 psi | 86% | 2904 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 57,014 psi | 89% | 2920 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 55,201 psi | 87% | 2946 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,282 psi | 74% | 2907 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 82% | 57,246 psi | 90% | 2792 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 54,172 psi | 85% | 2795 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 55,666 psi | 87% | 2861 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 96% | 56,637 psi | 89% | 2923 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 88% | 56,753 psi | 89% | 2844 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 55,100 psi | 86% | 2812 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 55,317 psi | 87% | 2782 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,420 psi | 88% | 2858 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 55,637 psi | 87% | 2854 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,723 psi | 86% | 2674 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,578 psi | 86% | 2766 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 56,159 psi | 88% | 2917 fps | 99.3% |
| Somchem S355 | <<locked>> | 86% | 57,377 psi | 90% | 2838 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 57,363 psi | 90% | 2854 fps | 97.9% |
| Somchem S365 | <<locked>> | 92% | 55,361 psi | 87% | 2877 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 57,261 psi | 90% | 2894 fps | 99.7% |
| Unknown powder | <<locked>> | 88% | 55,941 psi | 88% | 2881 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 55,274 psi | 87% | 2762 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 57,537 psi | 90% | 2867 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 56,478 psi | 89% | 2871 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 82% | 55,927 psi | 88% | 2759 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,710 psi | 89% | 2877 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,462 psi | 85% | 2894 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,679 psi | 86% | 2959 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 50,299 psi | 79% | 2874 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 57,246 psi | 90% | 2831 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 56,521 psi | 89% | 2913 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,590 psi | 81% | 2992 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,158 psi | 86% | 2861 fps | 99.1% |
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 2700 | <<locked>> | 80% | 47,413 psi | 74% | 2648 fps | 98.5% |
| Accurate 3100 | <<locked>> | 80% | 29,965 psi | 47% | 2365 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 52,620 psi | 82% | 2726 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 40,596 psi | 64% | 2621 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 96% | 50,560 psi | 79% | 2884 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 49,095 psi | 77% | 2710 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 39,030 psi | 61% | 2605 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 90% | 42,424 psi | 66% | 2707 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 96% | 33,707 psi | 53% | 2552 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 39,233 psi | 61% | 2605 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,024 psi | 78% | 2733 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 53,200 psi | 83% | 2802 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,262 psi | 62% | 2631 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,672 psi | 70% | 2749 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 38,841 psi | 61% | 2598 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 86% | 36,753 psi | 58% | 2598 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,979 psi | 45% | 2398 fps | 98.4% |
| Alliant Reloder-25 | <<locked>> | 84% | 28,848 psi | 45% | 2408 fps | 95.1% |
| Alliant Reloder-26 | 77.3 gr | 80% | 31,038 psi | 49% | 2513 fps | 97.2% |
| Bofors RP15 | <<locked>> | 90% | 38,754 psi | 61% | 2641 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 50,502 psi | 79% | 2746 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 41,118 psi | 64% | 2726 fps | 95.8% |
| Bofors RP5 | <<locked>> | 86% | 36,753 psi | 58% | 2598 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 44,164 psi | 69% | 2631 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 98% | 41,626 psi | 65% | 2684 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 50,720 psi | 79% | 2762 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 46,108 psi | 72% | 2740 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 80% | 41,640 psi | 65% | 2615 fps | 96.8% |
| Hodgdon H4831 | <<locked>> | 94% | 45,020 psi | 71% | 2707 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 44,512 psi | 70% | 2697 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,854 psi | 58% | 2523 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 52,344 psi | 82% | 2799 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 36,405 psi | 57% | 2657 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 41,278 psi | 65% | 2684 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,412 psi | 43% | 1572 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 51,837 psi | 81% | 2749 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,254 psi | 76% | 2684 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,268 psi | 74% | 2664 fps | 99% |
| IMR 4350 | <<locked>> | 80% | 39,668 psi | 62% | 2559 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,571 psi | 71% | 2657 fps | 98.7% |
| IMR 4831 | <<locked>> | 80% | 35,360 psi | 55% | 2497 fps | 98.7% |
| IMR 4955 Enduron | <<locked>> | 88% | 44,396 psi | 70% | 2657 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 90% | 43,424 psi | 68% | 2740 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 52,083 psi | 82% | 2733 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,163 psi | 68% | 2612 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 41,278 psi | 65% | 2592 fps | 98.1% |
| Lovex S071 | <<locked>> | 84% | 29,414 psi | 46% | 2349 fps | 95% |
| Norma 203B | <<locked>> | 80% | 52,562 psi | 82% | 2789 fps | 100% |
| Norma 204 | <<locked>> | 80% | 39,349 psi | 62% | 2592 fps | 95.6% |
| Norma MRP | 76.9 gr | 82% | 33,431 psi | 52% | 2543 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 40,089 psi | 63% | 2612 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 53,185 psi | 83% | 2812 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 42,351 psi | 66% | 2730 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 39,015 psi | 61% | 2605 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 88% | 36,825 psi | 58% | 2589 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,021 psi | 44% | 1611 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,546 psi | 79% | 2749 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,427 psi | 74% | 2795 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,437 psi | 63% | 2644 fps | 99.4% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,885 psi | 61% | 2651 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 33,286 psi | 52% | 2572 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 53,708 psi | 84% | 2743 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,543 psi | 75% | 2694 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 43,163 psi | 68% | 2641 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 84% | 38,116 psi | 60% | 2585 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 44,164 psi | 69% | 2631 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,163 psi | 68% | 2612 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 52,083 psi | 82% | 2733 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,278 psi | 65% | 2592 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,820 psi | 77% | 2749 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,399 psi | 76% | 2585 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,192 psi | 66% | 2556 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 37,768 psi | 59% | 2579 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 47,776 psi | 75% | 2694 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 44,150 psi | 69% | 2631 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 36,695 psi | 57% | 2572 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 33,866 psi | 53% | 2457 fps | 95% |
| Unknown powder | <<locked>> | 80% | 43,105 psi | 68% | 2667 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 80% | 45,513 psi | 71% | 2618 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,524 psi | 65% | 2608 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 35,621 psi | 56% | 2493 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 52,576 psi | 82% | 2713 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,002 psi | 64% | 2615 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 32,198 psi | 50% | 2470 fps | 98.4% |
| Vihtavuori N560 | 84.4 gr | 90% | 44,411 psi | 70% | 2772 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 96% | 43,874 psi | 69% | 2756 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,538 psi | 64% | 2575 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,108 psi | 72% | 2740 fps | 98.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,614 psi | 40% | 2388 fps | 98% |
| Winchester Supreme 780 | <<locked>> | 84% | 38,580 psi | 60% | 2566 fps | 95.6% |
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 90 powders for 8.5 mm Messner Mag. loaded with the .338 | 225gr | Woodleigh HS. Alliant Reloder-26 delivers the highest muzzle velocity at 3,009 fps; across all powders the maximum-charge window runs from 1,762 fps to 3,009 fps. ADI AR 2225 gives the best case fill at 100 %, and 90 of the 90 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, 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. ADI AR 2225, Alliant Reloder-23, Alliant Reloder-25 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. Norma MRP, Vihtavuori N560, Alliant Reloder-26 rank at the top here: for 8.5 mm Messner Mag. with the .338 | 225gr | Woodleigh HS 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.