Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 307gr | Hornady Sub-X bullet and 68 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, ReloadSwiss RS 76 and ReloadSwiss RS 80.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 90% | 55,767 psi | 87% | 2411 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,797 psi | 89% | 2425 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 54,491 psi | 85% | 2513 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 88% | 57,406 psi | 90% | 2490 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 55,405 psi | 87% | 2503 fps | 100% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,246 psi | 90% | 2533 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 49,559 psi | 78% | 2523 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,488 psi | 81% | 2503 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 54,302 psi | 85% | 2425 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 56,840 psi | 89% | 2477 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 55,782 psi | 87% | 2500 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,363 psi | 90% | 2457 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,072 psi | 89% | 2526 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 53,969 psi | 85% | 2493 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,041 psi | 85% | 2566 fps | 98.6% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 45,614 psi | 71% | 2438 fps | 96.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,101 psi | 88% | 2474 fps | 98.8% |
| Bofors RP15 | <<locked>> | 92% | 54,969 psi | 86% | 2487 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 56,826 psi | 89% | 2543 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 55,782 psi | 87% | 2500 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 54,984 psi | 86% | 2500 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 54,897 psi | 86% | 2448 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,595 psi | 90% | 2480 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 54,346 psi | 85% | 2359 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 55,956 psi | 88% | 2602 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,666 psi | 59% | 1503 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,550 psi | 89% | 2418 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,985 psi | 89% | 2415 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 55,622 psi | 87% | 2428 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 92% | 57,537 psi | 90% | 2539 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 96% | 57,624 psi | 90% | 2428 fps | 96% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,181 psi | 74% | 2434 fps | 99.7% |
| Lovex S065 | <<locked>> | 82% | 56,797 psi | 89% | 2392 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 55,230 psi | 87% | 2395 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,203 psi | 90% | 2428 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,537 psi | 90% | 2470 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 47,848 psi | 75% | 2454 fps | 100% |
| Norma MRP | <<locked>> | 88% | 55,825 psi | 87% | 2516 fps | 100% |
| Norma URP | <<locked>> | 82% | 54,998 psi | 86% | 2408 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 54,505 psi | 85% | 2507 fps | 100% |
| Ramshot Hunter | <<locked>> | 84% | 57,392 psi | 90% | 2464 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,637 psi | 89% | 2497 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,638 psi | 61% | 1539 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,811 psi | 89% | 2448 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 55,259 psi | 87% | 2474 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,507 psi | 89% | 2598 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 55,753 psi | 87% | 2572 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 86% | 54,737 psi | 86% | 2415 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 88% | 56,594 psi | 89% | 2470 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,797 psi | 89% | 2392 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 55,230 psi | 87% | 2395 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 55,637 psi | 87% | 2352 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,188 psi | 88% | 2467 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 55,912 psi | 88% | 2415 fps | 99.8% |
| Somchem S365 | <<locked>> | 84% | 56,144 psi | 88% | 2411 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,014 psi | 89% | 2444 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,565 psi | 89% | 2398 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 56,652 psi | 89% | 2431 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 55,259 psi | 87% | 2457 fps | 97.2% |
| Vihtavuori N550 | <<locked>> | 82% | 55,724 psi | 87% | 2405 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 55,941 psi | 88% | 2438 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 55,448 psi | 87% | 2520 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 94% | 55,709 psi | 87% | 2510 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 98% | 56,449 psi | 88% | 2569 fps | 99.6% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,493 psi | 90% | 2625 fps | 98.8% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 55,782 psi | 87% | 2359 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,608 psi | 89% | 2543 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,840 psi | 89% | 2444 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 40,161 psi | 63% | 2192 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 53,098 psi | 83% | 2379 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,292 psi | 65% | 2300 fps | 97.5% |
| ADI AR 2209 | <<locked>> | 80% | 44,150 psi | 69% | 2300 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 39,523 psi | 62% | 2251 fps | 98% |
| ADI AR 2217 | <<locked>> | 82% | 31,502 psi | 49% | 2087 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 96% | 43,033 psi | 67% | 2402 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 80% | 26,919 psi | 42% | 2014 fps | 96.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,778 psi | 80% | 2379 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,121 psi | 69% | 2293 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,103 psi | 63% | 2257 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,986 psi | 61% | 2208 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,547 psi | 53% | 2159 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,410 psi | 68% | 2349 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 40,480 psi | 63% | 2343 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 42,424 psi | 66% | 2382 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 41,292 psi | 65% | 2234 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 37,318 psi | 58% | 2205 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 31,024 psi | 49% | 2103 fps | 95.8% |
| Bofors RP5 | <<locked>> | 80% | 40,103 psi | 63% | 2257 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 31,966 psi | 50% | 2100 fps | 96.5% |
| Hodgdon H4831 | <<locked>> | 80% | 41,989 psi | 66% | 2247 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,379 psi | 65% | 2238 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,950 psi | 75% | 2277 fps | 100% |
| Hodgdon Retumbo | 71.8 gr | 80% | 32,808 psi | 51% | 2192 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,311 psi | 44% | 1342 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,864 psi | 78% | 2329 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,125 psi | 79% | 2329 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,395 psi | 68% | 2244 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 38,232 psi | 60% | 2238 fps | 97.8% |
| IMR 7977 Enduron | <<locked>> | 94% | 54,027 psi | 85% | 2379 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 88% | 31,705 psi | 50% | 2139 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 53,548 psi | 84% | 2349 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,851 psi | 81% | 2352 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,708 psi | 54% | 2090 fps | 99.5% |
| Norma 204 | <<locked>> | 80% | 50,343 psi | 79% | 2372 fps | 99.9% |
| Norma 217 | <<locked>> | 82% | 26,179 psi | 41% | 2014 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 42,264 psi | 66% | 2316 fps | 99.9% |
| Norma URP | <<locked>> | 80% | 51,561 psi | 81% | 2362 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,000 psi | 60% | 2247 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 80% | 50,357 psi | 79% | 2372 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,011 psi | 53% | 2146 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,950 psi | 45% | 1371 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,055 psi | 83% | 2402 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,488 psi | 81% | 2425 fps | 100% |
| ReloadSwiss RS 76 | 76.8 gr | 80% | 31,691 psi | 50% | 2172 fps | 98.7% |
| ReloadSwiss RS 80 | 83.3 gr | 86% | 35,694 psi | 56% | 2241 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 45,237 psi | 71% | 2277 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 43,758 psi | 69% | 2283 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,548 psi | 84% | 2349 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,851 psi | 81% | 2352 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,330 psi | 82% | 2313 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,410 psi | 68% | 2283 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 45,977 psi | 72% | 2270 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 49,139 psi | 77% | 2326 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,135 psi | 69% | 2264 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 53,011 psi | 83% | 2356 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,464 psi | 60% | 2162 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 92% | 48,457 psi | 76% | 2359 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 52,330 psi | 82% | 2362 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,352 psi | 68% | 2267 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,134 psi | 66% | 2313 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 80% | 34,853 psi | 55% | 2162 fps | 96.4% |
| Vihtavuori N568 | <<locked>> | 86% | 37,144 psi | 58% | 2257 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 92% | 43,424 psi | 68% | 2405 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,040 psi | 82% | 2316 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,042 psi | 56% | 2254 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,422 psi | 63% | 2208 fps | 99% |
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 74 powders for .338 Norma Mag. loaded with the .338 | 307gr | Hornady Sub-X. Vihtavuori N570 delivers the highest muzzle velocity at 2,625 fps; across all powders the maximum-charge window runs from 1,503 fps to 2,625 fps. Accurate 8700 gives the best case fill at 100 %, and 74 of the 74 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 307.0 gr projectile in 0.338" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2217, ADI AR 2218 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. Hodgdon Retumbo, ReloadSwiss RS 76, ReloadSwiss RS 80 rank at the top here: for .338 Norma Mag. with the .338 | 307gr | Hornady Sub-X they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Lovex D100, Ramshot LRT 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.