Load Specifications
Load data in caliber 8.5 mm Messner Mag. with .338 | 300gr | Nosler AccuBond bullet and 78 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 and Accurate MAGPRO.
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>> | 94% | 55,158 psi | 86% | 2454 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,652 psi | 89% | 2470 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 57,290 psi | 90% | 2602 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 82% | 57,696 psi | 90% | 2425 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,406 psi | 90% | 2533 fps | 100% |
| ADI AR 2213 | <<locked>> | 94% | 54,940 psi | 86% | 2546 fps | 99.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,110 psi | 77% | 2464 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,700 psi | 68% | 2438 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,638 psi | 90% | 2516 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,056 psi | 86% | 2487 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,840 psi | 89% | 2523 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,911 psi | 86% | 2539 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,130 psi | 88% | 2500 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,361 psi | 87% | 2566 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,434 psi | 88% | 2589 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 44,904 psi | 70% | 2477 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,579 psi | 89% | 2513 fps | 98.3% |
| Bofors RP15 | <<locked>> | 98% | 57,493 psi | 90% | 2572 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,256 psi | 80% | 2526 fps | 99.8% |
| Bofors RP5 | <<locked>> | 94% | 54,911 psi | 86% | 2539 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 55,521 psi | 87% | 2428 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,186 psi | 85% | 2536 fps | 100% |
| Hodgdon H414 | <<locked>> | 84% | 54,737 psi | 86% | 2477 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 57,450 psi | 90% | 2487 fps | 100% |
| Hodgdon H4831 | <<locked>> | 92% | 55,027 psi | 86% | 2490 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,508 psi | 90% | 2523 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,259 psi | 85% | 2405 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,099 psi | 85% | 2638 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 54,839 psi | 86% | 2516 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,246 psi | 58% | 1493 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,058 psi | 89% | 2464 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,855 psi | 89% | 2444 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 57,000 psi | 89% | 2464 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,115 psi | 88% | 2470 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 96% | 56,492 psi | 89% | 2575 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 39,465 psi | 62% | 2362 fps | 98% |
| Lovex S065 | <<locked>> | 86% | 57,464 psi | 90% | 2441 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,753 psi | 87% | 2444 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,101 psi | 88% | 2464 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,302 psi | 85% | 2470 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 39,479 psi | 62% | 2382 fps | 99.6% |
| Norma MRP | <<locked>> | 92% | 54,781 psi | 86% | 2559 fps | 100% |
| Norma URP | <<locked>> | 86% | 55,172 psi | 86% | 2457 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 57,392 psi | 90% | 2595 fps | 100% |
| Ramshot Hunter | <<locked>> | 88% | 57,551 psi | 90% | 2516 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,434 psi | 87% | 2536 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,058 psi | 60% | 1529 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,521 psi | 89% | 2497 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,940 psi | 86% | 2526 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,534 psi | 85% | 2635 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 49,342 psi | 77% | 2546 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 82% | 56,942 psi | 89% | 2415 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,911 psi | 86% | 2457 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 92% | 56,318 psi | 88% | 2513 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 55,521 psi | 87% | 2428 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,464 psi | 90% | 2441 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,753 psi | 87% | 2444 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,565 psi | 89% | 2293 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,782 psi | 89% | 2405 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,883 psi | 88% | 2510 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 56,565 psi | 89% | 2411 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,362 psi | 88% | 2457 fps | 99.5% |
| Somchem S365 | <<locked>> | 88% | 55,593 psi | 87% | 2457 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,855 psi | 89% | 2490 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 57,696 psi | 90% | 2382 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,811 psi | 89% | 2444 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,260 psi | 88% | 2470 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 54,563 psi | 86% | 2487 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 86% | 55,869 psi | 88% | 2454 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,984 psi | 86% | 2480 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,607 psi | 86% | 2559 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 98% | 54,157 psi | 85% | 2543 fps | 99.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 50,647 psi | 79% | 2546 fps | 98.7% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 48,008 psi | 75% | 2543 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,130 psi | 88% | 2411 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,911 psi | 86% | 2480 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 53,592 psi | 84% | 2582 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,623 psi | 89% | 2487 fps | 100% |
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% | 34,693 psi | 54% | 2139 fps | 99.3% |
| Accurate 4350 | <<locked>> | 80% | 46,470 psi | 73% | 2339 fps | 100% |
| Accurate MAGPRO | 68.4 gr | 80% | 35,331 psi | 55% | 2238 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 54,244 psi | 85% | 2382 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,783 psi | 61% | 2247 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 80% | 34,519 psi | 54% | 2192 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 88% | 33,330 psi | 52% | 2169 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 84% | 26,469 psi | 41% | 2044 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,454 psi | 70% | 2343 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,343 psi | 80% | 2441 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,754 psi | 61% | 2244 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 34,563 psi | 54% | 2201 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,330 psi | 52% | 2162 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,066 psi | 46% | 2103 fps | 98.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,230 psi | 57% | 2290 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 41,945 psi | 66% | 2421 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 44,338 psi | 69% | 2323 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 32,227 psi | 51% | 2149 fps | 96.5% |
| Bofors RP30 | <<locked>> | 86% | 32,155 psi | 50% | 2182 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 34,563 psi | 54% | 2201 fps | 97.4% |
| Bofors RP7 | <<locked>> | 80% | 49,037 psi | 77% | 2336 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 31,792 psi | 50% | 2133 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 48,022 psi | 75% | 2385 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 50,531 psi | 79% | 2392 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 80% | 36,753 psi | 58% | 2195 fps | 96% |
| Hodgdon H4831 SC | <<locked>> | 80% | 36,172 psi | 57% | 2182 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,032 psi | 66% | 2241 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 28,384 psi | 44% | 2119 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 47,398 psi | 74% | 2411 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,963 psi | 44% | 1332 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,570 psi | 70% | 2287 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,285 psi | 79% | 2356 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 44,193 psi | 69% | 2293 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 38,682 psi | 61% | 2195 fps | 96.7% |
| IMR 7828 SSC | <<locked>> | 80% | 33,286 psi | 52% | 2172 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 94% | 32,503 psi | 51% | 2211 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 47,964 psi | 75% | 2313 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 46,296 psi | 73% | 2313 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 29,994 psi | 47% | 2041 fps | 98.2% |
| Norma 204 | <<locked>> | 80% | 44,425 psi | 70% | 2326 fps | 99.2% |
| Norma 217 | <<locked>> | 88% | 26,876 psi | 42% | 2087 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 36,056 psi | 56% | 2260 fps | 99% |
| Norma URP | <<locked>> | 80% | 45,527 psi | 71% | 2326 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 32,721 psi | 51% | 2178 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 44,266 psi | 69% | 2333 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 29,066 psi | 46% | 2080 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,587 psi | 45% | 1365 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,311 psi | 73% | 2359 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,382 psi | 70% | 2379 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 27,180 psi | 43% | 2093 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 36,869 psi | 58% | 2323 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 53,403 psi | 84% | 2372 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 40,103 psi | 63% | 2224 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 80% | 38,072 psi | 60% | 2231 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 80% | 49,037 psi | 77% | 2336 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,964 psi | 75% | 2313 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 46,296 psi | 73% | 2313 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,330 psi | 84% | 2257 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,949 psi | 74% | 2274 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,753 psi | 59% | 2228 fps | 98.3% |
| Somchem S355 | <<locked>> | 80% | 53,171 psi | 83% | 2369 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 40,640 psi | 64% | 2218 fps | 97% |
| Somchem S365 | <<locked>> | 80% | 42,641 psi | 67% | 2290 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,638 psi | 61% | 2215 fps | 99% |
| Vihtavuori N150 | <<locked>> | 80% | 50,879 psi | 80% | 2303 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,934 psi | 74% | 2320 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 33,475 psi | 52% | 2110 fps | 97.5% |
| Vihtavuori N170 | <<locked>> | 98% | 50,981 psi | 80% | 2438 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 46,238 psi | 72% | 2326 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,507 psi | 59% | 2224 fps | 100% |
| Vihtavuori N560 | 67.1 gr | 80% | 36,289 psi | 57% | 2251 fps | 96.1% |
| Vihtavuori N565 | <<locked>> | 84% | 34,055 psi | 53% | 2198 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 92% | 38,580 psi | 60% | 2339 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 98% | 44,773 psi | 70% | 2484 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,803 psi | 72% | 2283 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,211 psi | 76% | 2388 fps | 100% |
| Winchester StaBALL HD | 66.4 gr | 80% | 29,573 psi | 46% | 2198 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 35,273 psi | 55% | 2156 fps | 97.4% |
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 78 powders for 8.5 mm Messner Mag. loaded with the .338 | 300gr | Nosler AccuBond. Hodgdon Retumbo delivers the highest muzzle velocity at 2,638 fps; across all powders the maximum-charge window runs from 1,493 fps to 2,638 fps. ADI AR 2217 gives the best case fill at 100 %, and 78 of the 78 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 300.0 gr projectile in 0.338" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, 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. Winchester StaBALL HD, Vihtavuori N560, Accurate MAGPRO rank at the top here: for 8.5 mm Messner Mag. with the .338 | 300gr | 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.