Load Specifications
Load data in caliber 8.5 mm Messner Mag. with .338 | 265gr | Nosler AccuBond Long Range bullet and 84 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Alliant Reloder-26 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.
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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 98% | 57,334 psi | 90% | 2644 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,477 psi | 87% | 2625 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 55,666 psi | 87% | 2743 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 84% | 57,261 psi | 90% | 2585 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,144 psi | 88% | 2680 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 98% | 57,319 psi | 90% | 2736 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 44,802 psi | 70% | 2533 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,755 psi | 62% | 2503 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,027 psi | 86% | 2559 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,217 psi | 88% | 2674 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,537 psi | 90% | 2690 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,564 psi | 87% | 2671 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 56,826 psi | 89% | 2730 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 57,740 psi | 90% | 2694 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,053 psi | 78% | 2661 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,346 psi | 85% | 2740 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 55,898 psi | 88% | 2648 fps | 96.8% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,738 psi | 87% | 2713 fps | 99.8% |
| Bofors RP3 | <<locked>> | 82% | 55,883 psi | 88% | 2575 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 45,890 psi | 72% | 2602 fps | 98.4% |
| Bofors RP5 | <<locked>> | 98% | 56,826 psi | 89% | 2730 fps | 99.9% |
| Bofors RP7 | <<locked>> | 86% | 55,071 psi | 86% | 2579 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,284 psi | 77% | 2615 fps | 99% |
| Hodgdon H380 | <<locked>> | 82% | 55,883 psi | 88% | 2595 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,363 psi | 90% | 2677 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 56,594 psi | 89% | 2638 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 96% | 57,508 psi | 90% | 2680 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,376 psi | 88% | 2664 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,536 psi | 89% | 2598 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,052 psi | 77% | 2720 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 57,624 psi | 90% | 2720 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,985 psi | 58% | 1591 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,724 psi | 89% | 2566 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,130 psi | 88% | 2612 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,405 psi | 88% | 2598 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 55,709 psi | 87% | 2615 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,230 psi | 87% | 2615 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 98% | 54,955 psi | 86% | 2717 fps | 99.2% |
| Lovex S062 | <<locked>> | 82% | 57,203 psi | 90% | 2556 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,782 psi | 89% | 2595 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 54,882 psi | 86% | 2595 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,140 psi | 80% | 2562 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,985 psi | 89% | 2667 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 35,302 psi | 55% | 2438 fps | 97.5% |
| Norma MRP | <<locked>> | 96% | 56,637 psi | 89% | 2753 fps | 100% |
| Norma URP | <<locked>> | 90% | 57,479 psi | 90% | 2654 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,637 psi | 87% | 2736 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 90% | 56,217 psi | 88% | 2667 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,388 psi | 84% | 2671 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,695 psi | 59% | 1631 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,738 psi | 87% | 2585 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,072 psi | 89% | 2677 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,230 psi | 87% | 2648 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,290 psi | 90% | 2726 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,994 psi | 77% | 2713 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 43,976 psi | 69% | 2602 fps | 96.5% |
| Rottweil R 903 | <<locked>> | 84% | 56,144 psi | 88% | 2575 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,551 psi | 90% | 2648 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 94% | 54,969 psi | 86% | 2657 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 86% | 55,071 psi | 86% | 2579 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,782 psi | 89% | 2595 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,203 psi | 90% | 2556 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 54,882 psi | 86% | 2595 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,638 psi | 90% | 2631 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,420 psi | 88% | 2454 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,115 psi | 88% | 2552 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,520 psi | 85% | 2654 fps | 99.7% |
| Somchem S355 | <<locked>> | 84% | 55,796 psi | 87% | 2569 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,564 psi | 87% | 2598 fps | 98.6% |
| Somchem S365 | <<locked>> | 92% | 57,682 psi | 90% | 2657 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,419 psi | 87% | 2631 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 86% | 57,072 psi | 89% | 2543 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,941 psi | 88% | 2602 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 54,911 psi | 86% | 2615 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 82% | 57,595 psi | 90% | 2536 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 55,114 psi | 86% | 2612 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,724 psi | 89% | 2674 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,594 psi | 89% | 2749 fps | 99.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,243 psi | 82% | 2674 fps | 98.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 45,513 psi | 71% | 2612 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,303 psi | 87% | 2566 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,363 psi | 90% | 2677 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,505 psi | 85% | 2779 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,376 psi | 87% | 2631 fps | 99.7% |
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 3100 | <<locked>> | 80% | 31,357 psi | 49% | 2208 fps | 97.4% |
| Accurate 4350 | <<locked>> | 80% | 42,308 psi | 66% | 2431 fps | 100% |
| Accurate MAGPRO | 76.5 gr | 88% | 42,047 psi | 66% | 2516 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 50,633 psi | 79% | 2493 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 35,607 psi | 56% | 2320 fps | 96% |
| ADI AR 2213 | <<locked>> | 86% | 38,537 psi | 60% | 2411 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 94% | 36,956 psi | 58% | 2375 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 92% | 30,951 psi | 49% | 2290 fps | 96.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,721 psi | 81% | 2516 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,698 psi | 64% | 2438 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,572 psi | 73% | 2543 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 35,447 psi | 56% | 2316 fps | 96.1% |
| Alliant Reloder-22 | <<locked>> | 82% | 33,504 psi | 53% | 2316 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,197 psi | 47% | 2234 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 26,527 psi | 42% | 2152 fps | 95.7% |
| Alliant Reloder-26 | 70.4 gr | 80% | 32,576 psi | 51% | 2359 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 49,574 psi | 78% | 2549 fps | 95.4% |
| Bofors RP15 | <<locked>> | 84% | 33,373 psi | 52% | 2310 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 52,460 psi | 82% | 2533 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 35,331 psi | 55% | 2392 fps | 95.4% |
| Bofors RP5 | <<locked>> | 82% | 33,504 psi | 53% | 2316 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 45,585 psi | 71% | 2434 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 90% | 35,331 psi | 55% | 2343 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 52,533 psi | 82% | 2549 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,179 psi | 69% | 2480 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 46,905 psi | 74% | 2490 fps | 99% |
| Hodgdon H4831 | <<locked>> | 86% | 41,234 psi | 65% | 2418 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 86% | 40,408 psi | 63% | 2405 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,421 psi | 60% | 2333 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 33,315 psi | 52% | 2382 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 43,134 psi | 68% | 2500 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,717 psi | 43% | 1421 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,301 psi | 84% | 2520 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,176 psi | 65% | 2375 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,050 psi | 74% | 2457 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 40,466 psi | 63% | 2385 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 84% | 40,422 psi | 63% | 2365 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 86% | 37,057 psi | 58% | 2392 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 53,809 psi | 84% | 2516 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,541 psi | 70% | 2411 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 42,786 psi | 67% | 2405 fps | 99.3% |
| Lovex S071 | <<locked>> | 80% | 27,151 psi | 43% | 2100 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 40,857 psi | 64% | 2408 fps | 97.5% |
| Norma 217 | <<locked>> | 96% | 30,980 psi | 49% | 2326 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 32,648 psi | 51% | 2326 fps | 96.7% |
| Norma URP | <<locked>> | 80% | 41,727 psi | 65% | 2421 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 36,477 psi | 57% | 2395 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 40,582 psi | 64% | 2421 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 86% | 32,445 psi | 51% | 2290 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,268 psi | 44% | 1457 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,286 psi | 82% | 2539 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,414 psi | 77% | 2579 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,177 psi | 66% | 2454 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,451 psi | 63% | 2467 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 30,226 psi | 47% | 2300 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 41,002 psi | 64% | 2546 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 49,327 psi | 77% | 2484 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 36,956 psi | 58% | 2303 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 80% | 34,635 psi | 54% | 2300 fps | 96% |
| Rottweil R 907 | <<locked>> | 80% | 45,585 psi | 71% | 2434 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,541 psi | 70% | 2411 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 53,809 psi | 84% | 2516 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,786 psi | 67% | 2405 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,575 psi | 79% | 2539 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,951 psi | 78% | 2372 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,613 psi | 68% | 2365 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 34,330 psi | 54% | 2297 fps | 95.9% |
| Somchem S355 | <<locked>> | 80% | 49,356 psi | 77% | 2480 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 40,103 psi | 63% | 2346 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 38,537 psi | 60% | 2385 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,389 psi | 55% | 2290 fps | 97.1% |
| Vihtavuori N150 | <<locked>> | 80% | 47,137 psi | 74% | 2411 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,120 psi | 68% | 2415 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 32,590 psi | 51% | 2224 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 54,244 psi | 85% | 2493 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,583 psi | 67% | 2421 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 33,866 psi | 53% | 2303 fps | 99.6% |
| Vihtavuori N560 | 71.7 gr | 84% | 37,768 psi | 59% | 2421 fps | 95% |
| Vihtavuori N565 | <<locked>> | 90% | 37,318 psi | 58% | 2411 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 98% | 42,554 psi | 67% | 2556 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,989 psi | 66% | 2382 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,179 psi | 69% | 2480 fps | 99.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,774 psi | 42% | 2251 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 82% | 34,330 psi | 54% | 2270 fps | 95.7% |
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 89 powders for 8.5 mm Messner Mag. loaded with the .338 | 265gr | Nosler AccuBond Long Range. Winchester StaBALL HD delivers the highest muzzle velocity at 2,779 fps; across all powders the maximum-charge window runs from 1,591 fps to 2,779 fps. ADI AR 2217 gives the best case fill at 100 %, and 89 of the 89 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 265.0 gr projectile in 0.338" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-23 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. Accurate MAGPRO, Alliant Reloder-26, Vihtavuori N560 rank at the top here: for 8.5 mm Messner Mag. with the .338 | 265gr | Nosler AccuBond Long Range they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 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.