Load Specifications
Load data in caliber 8.5 mm Messner Mag. with .338 | 225gr | Nosler AccuBond bullet and 92 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Vihtavuori N560.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 57,029 psi | 89% | 2726 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,476 psi | 85% | 2759 fps | 99.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 56,434 psi | 88% | 2861 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 57,435 psi | 90% | 2785 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 54,752 psi | 86% | 2851 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 54,737 psi | 86% | 2953 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 86% | 57,145 psi | 90% | 2818 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 55,463 psi | 87% | 2897 fps | 99% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 56,869 psi | 89% | 2956 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 36,564 psi | 57% | 2618 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 56,913 psi | 89% | 2949 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,708 psi | 86% | 2792 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,940 psi | 86% | 2815 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 55,347 psi | 87% | 2904 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 56,811 psi | 89% | 2927 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,955 psi | 86% | 2887 fps | 98.9% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 55,970 psi | 88% | 2949 fps | 99.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 53,011 psi | 83% | 2874 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,977 psi | 72% | 2815 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 98% | 57,116 psi | 90% | 3018 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 51,271 psi | 80% | 2874 fps | 98.5% |
| Bofors RP3 | <<locked>> | 84% | 55,579 psi | 87% | 2812 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 55,970 psi | 88% | 2949 fps | 99.2% |
| Bofors RP7 | <<locked>> | 88% | 54,955 psi | 86% | 2805 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 45,614 psi | 71% | 2749 fps | 96.7% |
| Hodgdon H380 | <<locked>> | 84% | 55,898 psi | 88% | 2831 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 56,739 psi | 89% | 2904 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 88% | 56,420 psi | 88% | 2864 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 98% | 57,043 psi | 89% | 2897 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 55,970 psi | 88% | 2881 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,811 psi | 87% | 2828 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 57,116 psi | 90% | 2858 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,976 psi | 70% | 2851 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 90% | 57,246 psi | 90% | 2946 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,579 psi | 57% | 1745 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 57,566 psi | 90% | 2818 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 56,782 psi | 89% | 2805 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 55,767 psi | 87% | 2792 fps | 99.7% |
| IMR 4350 | <<locked>> | 92% | 55,883 psi | 88% | 2838 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 56,550 psi | 89% | 2828 fps | 99.7% |
| IMR 4831 | <<locked>> | 92% | 55,114 psi | 86% | 2841 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,376 psi | 88% | 2841 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,839 psi | 86% | 2825 fps | 97.5% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 54,215 psi | 85% | 2927 fps | 98% |
| Lovex S062 | <<locked>> | 84% | 56,942 psi | 89% | 2792 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 56,652 psi | 89% | 2825 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 54,476 psi | 85% | 2815 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 46,978 psi | 74% | 2720 fps | 99.4% |
| Norma 203B | <<locked>> | 84% | 57,711 psi | 90% | 2851 fps | 100% |
| Norma 204 | <<locked>> | 92% | 56,666 psi | 89% | 2890 fps | 99% |
| Norma MRP | <<locked>> | 98% | 55,637 psi | 87% | 2976 fps | 99.8% |
| Norma URP | <<locked>> | 92% | 57,014 psi | 89% | 2887 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,911 psi | 86% | 2828 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 54,868 psi | 86% | 2946 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 92% | 55,695 psi | 87% | 2894 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 49,023 psi | 77% | 2822 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,347 psi | 59% | 1785 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,637 psi | 87% | 2815 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 56,289 psi | 88% | 2917 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 54,505 psi | 85% | 2874 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 56,695 psi | 89% | 2959 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 45,049 psi | 71% | 2848 fps | 99% |
| Rottweil R 902 | <<locked>> | 82% | 55,463 psi | 87% | 2756 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 55,680 psi | 87% | 2808 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 57,203 psi | 90% | 2867 fps | 98.3% |
| Rottweil R 905 | <<locked>> | 96% | 54,302 psi | 85% | 2877 fps | 99% |
| Rottweil R 907 | <<locked>> | 88% | 54,955 psi | 86% | 2805 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 56,652 psi | 89% | 2825 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 56,942 psi | 89% | 2792 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 54,476 psi | 85% | 2815 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 57,319 psi | 90% | 2867 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 56,478 psi | 89% | 2687 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 56,347 psi | 88% | 2779 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 57,493 psi | 90% | 2927 fps | 99.3% |
| Somchem S355 | <<locked>> | 86% | 55,564 psi | 87% | 2802 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 55,376 psi | 87% | 2808 fps | 97.4% |
| Somchem S365 | <<locked>> | 94% | 56,478 psi | 89% | 2887 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,868 psi | 86% | 2851 fps | 99.4% |
| Vihtavuori N135 | <<locked>> | 82% | 55,912 psi | 88% | 2710 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,072 psi | 88% | 2730 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 56,782 psi | 89% | 2772 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 55,477 psi | 87% | 2828 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 54,215 psi | 85% | 2825 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 54,230 psi | 85% | 2726 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 54,563 psi | 86% | 2838 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 55,622 psi | 87% | 2900 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 55,811 psi | 87% | 2966 fps | 97.9% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 47,732 psi | 75% | 2818 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 54,897 psi | 86% | 2792 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 56,971 psi | 89% | 2907 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 48,327 psi | 76% | 2943 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 54,998 psi | 86% | 2848 fps | 98.9% |
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% | 53,490 psi | 84% | 2680 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 50,850 psi | 80% | 2700 fps | 98.8% |
| Accurate 3100 | <<locked>> | 82% | 30,734 psi | 48% | 2379 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 50,676 psi | 79% | 2690 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,899 psi | 61% | 2579 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 94% | 47,485 psi | 74% | 2828 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 47,645 psi | 75% | 2674 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 40,074 psi | 63% | 2618 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 92% | 43,613 psi | 68% | 2717 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 98% | 34,389 psi | 54% | 2559 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,113 psi | 83% | 2890 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,269 psi | 76% | 2697 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,459 psi | 81% | 2762 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,724 psi | 59% | 2589 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,859 psi | 67% | 2710 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 39,856 psi | 62% | 2612 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 37,579 psi | 59% | 2608 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,760 psi | 44% | 2356 fps | 97.8% |
| Alliant Reloder-25 | <<locked>> | 86% | 29,501 psi | 46% | 2418 fps | 95.1% |
| Alliant Reloder-26 | 74.5 gr | 80% | 29,617 psi | 46% | 2467 fps | 96.3% |
| Bofors RP15 | <<locked>> | 92% | 39,697 psi | 62% | 2654 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 48,776 psi | 76% | 2710 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 37,579 psi | 59% | 2608 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 42,670 psi | 67% | 2589 fps | 97.5% |
| Hodgdon H1000 | <<locked>> | 98% | 42,714 psi | 67% | 2694 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 48,921 psi | 77% | 2723 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 40,741 psi | 64% | 2625 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 80% | 43,729 psi | 69% | 2644 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 92% | 46,586 psi | 73% | 2723 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 45,701 psi | 72% | 2707 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,389 psi | 55% | 2484 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 53,447 psi | 84% | 2808 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,115 psi | 58% | 2664 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 39,726 psi | 62% | 2641 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,412 psi | 43% | 1558 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 54,099 psi | 85% | 2772 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,082 psi | 78% | 2703 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,272 psi | 82% | 2736 fps | 99.4% |
| IMR 4350 | <<locked>> | 80% | 38,421 psi | 60% | 2523 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,135 psi | 69% | 2618 fps | 98.2% |
| IMR 4831 | <<locked>> | 80% | 37,391 psi | 59% | 2536 fps | 99% |
| IMR 4895 | <<locked>> | 80% | 52,808 psi | 83% | 2792 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 45,629 psi | 72% | 2667 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 94% | 44,454 psi | 70% | 2749 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 50,328 psi | 79% | 2697 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,655 psi | 65% | 2572 fps | 98.8% |
| Lovex S070 | <<locked>> | 80% | 39,987 psi | 63% | 2556 fps | 97.6% |
| Lovex S071 | <<locked>> | 86% | 30,008 psi | 47% | 2359 fps | 95% |
| Norma 203B | <<locked>> | 80% | 50,821 psi | 80% | 2749 fps | 100% |
| Norma 204 | <<locked>> | 82% | 40,495 psi | 63% | 2605 fps | 95.7% |
| Norma MRP | 76 gr | 84% | 34,345 psi | 54% | 2559 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 38,624 psi | 61% | 2572 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 80% | 51,416 psi | 81% | 2776 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 41,292 psi | 65% | 2694 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 37,434 psi | 59% | 2562 fps | 97.6% |
| Ramshot Magnum | <<locked>> | 92% | 36,579 psi | 57% | 2572 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,876 psi | 44% | 1594 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,878 psi | 77% | 2707 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 45,527 psi | 71% | 2756 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,595 psi | 60% | 2598 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,463 psi | 59% | 2612 fps | 98.6% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,069 psi | 53% | 2582 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 52,098 psi | 82% | 2707 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,948 psi | 72% | 2657 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,411 psi | 70% | 2654 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 86% | 39,015 psi | 61% | 2598 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 42,670 psi | 67% | 2589 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,655 psi | 65% | 2572 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 50,328 psi | 79% | 2697 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,987 psi | 63% | 2556 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,050 psi | 74% | 2713 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,036 psi | 74% | 2556 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,814 psi | 64% | 2516 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 38,667 psi | 61% | 2592 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 46,108 psi | 72% | 2657 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 45,353 psi | 71% | 2641 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 35,172 psi | 55% | 2533 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 34,708 psi | 54% | 2470 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 52,678 psi | 83% | 2667 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 52,692 psi | 83% | 2684 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,092 psi | 69% | 2585 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,972 psi | 63% | 2569 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 36,564 psi | 57% | 2507 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 50,821 psi | 80% | 2680 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,392 psi | 62% | 2572 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 30,806 psi | 48% | 2431 fps | 97.8% |
| Vihtavuori N560 | 83.2 gr | 92% | 45,571 psi | 71% | 2789 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 98% | 44,556 psi | 70% | 2759 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,015 psi | 61% | 2539 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 40,915 psi | 64% | 2628 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,555 psi | 38% | 2336 fps | 97% |
| Winchester Supreme 780 | <<locked>> | 88% | 38,870 psi | 61% | 2562 fps | 95.4% |
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 92 powders for 8.5 mm Messner Mag. loaded with the .338 | 225gr | Nosler AccuBond. Alliant Reloder-26 delivers the highest muzzle velocity at 3,018 fps; across all powders the maximum-charge window runs from 1,745 fps to 3,018 fps. Accurate 3100 gives the best case fill at 100 %, and 92 of the 92 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 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2213, ADI AR 2225 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, Norma MRP, Vihtavuori N560 rank at the top here: for 8.5 mm Messner Mag. with the .338 | 225gr | Nosler AccuBond 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.