Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 300gr | Nosler Custom Competition bullet and 73 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 Winchester StaBALL HD.
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>> | 92% | 55,637 psi | 87% | 2421 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,927 psi | 89% | 2441 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 54,114 psi | 85% | 2520 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 90% | 57,551 psi | 90% | 2503 fps | 100% |
| ADI AR 2213 | <<locked>> | 92% | 55,158 psi | 86% | 2513 fps | 99.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,113 psi | 83% | 2487 fps | 99.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,413 psi | 74% | 2457 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,667 psi | 90% | 2480 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,000 psi | 89% | 2490 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,419 psi | 87% | 2507 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,811 psi | 89% | 2470 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,159 psi | 88% | 2533 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,348 psi | 90% | 2556 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 49,298 psi | 77% | 2507 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,318 psi | 88% | 2480 fps | 98.3% |
| Bofors RP15 | <<locked>> | 94% | 54,607 psi | 86% | 2497 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,927 psi | 88% | 2546 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 55,419 psi | 87% | 2507 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 55,143 psi | 86% | 2392 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 54,621 psi | 86% | 2507 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 54,679 psi | 86% | 2444 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,014 psi | 89% | 2451 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 54,984 psi | 86% | 2457 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,595 psi | 90% | 2490 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,505 psi | 85% | 2372 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,042 psi | 86% | 2605 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,737 psi | 86% | 2477 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,420 psi | 59% | 1496 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,855 psi | 89% | 2431 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,391 psi | 88% | 2408 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,101 psi | 89% | 2431 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,985 psi | 88% | 2441 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 94% | 57,014 psi | 89% | 2543 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,062 psi | 67% | 2382 fps | 98.8% |
| Lovex S065 | <<locked>> | 84% | 57,203 psi | 90% | 2405 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,579 psi | 87% | 2411 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 56,724 psi | 89% | 2434 fps | 100% |
| Norma 204 | <<locked>> | 84% | 54,186 psi | 85% | 2438 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 43,439 psi | 68% | 2405 fps | 99.9% |
| Norma MRP | <<locked>> | 90% | 55,332 psi | 87% | 2523 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,172 psi | 86% | 2425 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 53,998 psi | 85% | 2513 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 86% | 57,406 psi | 90% | 2477 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,130 psi | 88% | 2503 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,392 psi | 60% | 1535 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,840 psi | 89% | 2461 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,027 psi | 86% | 2487 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 55,521 psi | 87% | 2602 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 54,607 psi | 86% | 2572 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 88% | 54,868 psi | 86% | 2425 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 90% | 56,623 psi | 89% | 2484 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 55,143 psi | 86% | 2392 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,203 psi | 90% | 2405 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,579 psi | 87% | 2411 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,275 psi | 88% | 2369 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,188 psi | 88% | 2480 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 56,231 psi | 88% | 2425 fps | 99.5% |
| Somchem S365 | <<locked>> | 86% | 55,941 psi | 88% | 2425 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,971 psi | 89% | 2454 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,319 psi | 90% | 2349 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,869 psi | 89% | 2415 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 56,608 psi | 89% | 2441 fps | 100% |
| Vihtavuori N170 | <<locked>> | 98% | 54,998 psi | 86% | 2461 fps | 96.5% |
| Vihtavuori N550 | <<locked>> | 84% | 55,883 psi | 88% | 2421 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,666 psi | 87% | 2451 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,071 psi | 86% | 2526 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 96% | 55,071 psi | 86% | 2516 fps | 99.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,767 psi | 87% | 2572 fps | 99.3% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 52,605 psi | 82% | 2569 fps | 97.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,028 psi | 88% | 2375 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,897 psi | 86% | 2448 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,274 psi | 87% | 2549 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,855 psi | 89% | 2457 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% | 37,318 psi | 58% | 2152 fps | 99.6% |
| Accurate 4350 | <<locked>> | 80% | 49,661 psi | 78% | 2349 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 38,145 psi | 60% | 2251 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 41,379 psi | 65% | 2260 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 36,956 psi | 58% | 2208 fps | 96.7% |
| ADI AR 2217 | <<locked>> | 86% | 33,518 psi | 53% | 2139 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 82% | 26,672 psi | 42% | 2011 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,703 psi | 75% | 2352 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,321 psi | 65% | 2254 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,289 psi | 58% | 2218 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,071 psi | 57% | 2175 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,198 psi | 49% | 2116 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,784 psi | 62% | 2306 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 42,685 psi | 67% | 2395 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 44,077 psi | 69% | 2287 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 34,722 psi | 54% | 2165 fps | 97.2% |
| Bofors RP30 | <<locked>> | 84% | 32,779 psi | 51% | 2156 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 37,289 psi | 58% | 2218 fps | 98.1% |
| Bofors RP7 | <<locked>> | 80% | 51,808 psi | 81% | 2349 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 31,865 psi | 50% | 2103 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 51,126 psi | 80% | 2395 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 53,577 psi | 84% | 2405 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 39,320 psi | 62% | 2208 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 38,711 psi | 61% | 2198 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,875 psi | 70% | 2247 fps | 100% |
| Hodgdon Retumbo | 68.5 gr | 80% | 30,429 psi | 48% | 2139 fps | 96.3% |
| Hodgdon Superformance | <<locked>> | 80% | 51,068 psi | 80% | 2428 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 44% | 1335 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,195 psi | 74% | 2297 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,011 psi | 83% | 2365 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,108 psi | 74% | 2303 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,002 psi | 64% | 2208 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 35,578 psi | 56% | 2192 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 92% | 33,257 psi | 52% | 2188 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 50,749 psi | 80% | 2323 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,037 psi | 77% | 2323 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 32,271 psi | 51% | 2054 fps | 98.7% |
| Norma 204 | <<locked>> | 80% | 47,442 psi | 74% | 2339 fps | 99.5% |
| Norma 217 | <<locked>> | 86% | 27,340 psi | 43% | 2057 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 39,073 psi | 61% | 2274 fps | 99.4% |
| Norma URP | <<locked>> | 80% | 48,515 psi | 76% | 2336 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 35,157 psi | 55% | 2195 fps | 96.6% |
| Ramshot Hunter | <<locked>> | 80% | 47,369 psi | 74% | 2343 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 31,328 psi | 49% | 2096 fps | 97% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,761 psi | 45% | 1368 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,617 psi | 78% | 2369 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,819 psi | 75% | 2392 fps | 100% |
| ReloadSwiss RS 76 | 73.3 gr | 80% | 29,298 psi | 46% | 2113 fps | 97% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 35,027 psi | 55% | 2238 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 42,641 psi | 67% | 2241 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 80% | 40,799 psi | 64% | 2244 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 80% | 51,808 psi | 81% | 2349 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,749 psi | 80% | 2323 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,037 psi | 77% | 2323 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,545 psi | 78% | 2283 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,466 psi | 63% | 2241 fps | 98.8% |
| Somchem S361 | <<locked>> | 80% | 43,236 psi | 68% | 2234 fps | 97.7% |
| Somchem S365 | <<locked>> | 80% | 45,876 psi | 72% | 2300 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,350 psi | 65% | 2228 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 80% | 53,824 psi | 84% | 2310 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,864 psi | 78% | 2326 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,839 psi | 56% | 2126 fps | 98.1% |
| Vihtavuori N170 | <<locked>> | 94% | 48,269 psi | 76% | 2362 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 49,153 psi | 77% | 2333 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,306 psi | 63% | 2234 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 39,117 psi | 61% | 2267 fps | 96.9% |
| Vihtavuori N565 | <<locked>> | 82% | 34,548 psi | 54% | 2169 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 90% | 39,204 psi | 61% | 2306 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 96% | 45,643 psi | 72% | 2457 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,878 psi | 77% | 2290 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,285 psi | 80% | 2398 fps | 100% |
| Winchester StaBALL HD | 70.4 gr | 80% | 32,503 psi | 51% | 2215 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,797 psi | 59% | 2169 fps | 98.1% |
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 79 powders for .338 Norma Mag. loaded with the .338 | 300gr | Nosler Custom Competition. Hodgdon Retumbo delivers the highest muzzle velocity at 2,605 fps; across all powders the maximum-charge window runs from 1,496 fps to 2,605 fps. ADI AR 2217 gives the best case fill at 100 %, and 79 of the 79 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 2218, 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. Hodgdon Retumbo, ReloadSwiss RS 76, Winchester StaBALL HD rank at the top here: for .338 Norma Mag. with the .338 | 300gr | Nosler Custom Competition they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-50, IMR 7977 Enduron, Lovex D100 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.