Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 300gr | MAKER Solid Copper bullet and 76 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.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 56,420 psi | 88% | 2421 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 54,317 psi | 85% | 2398 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 54,926 psi | 86% | 2516 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 90% | 54,969 psi | 86% | 2454 fps | 100% |
| ADI AR 2213 | <<locked>> | 94% | 56,115 psi | 88% | 2513 fps | 99.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,314 psi | 79% | 2431 fps | 99.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,860 psi | 70% | 2405 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 55,303 psi | 87% | 2441 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 56,144 psi | 88% | 2451 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 54,317 psi | 85% | 2444 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 94% | 56,173 psi | 88% | 2507 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 96% | 57,450 psi | 90% | 2467 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,666 psi | 89% | 2530 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 53,925 psi | 85% | 2507 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 46,340 psi | 73% | 2448 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,653 psi | 90% | 2480 fps | 98.2% |
| Bofors RP15 | <<locked>> | 96% | 55,347 psi | 87% | 2497 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,750 psi | 83% | 2493 fps | 99.8% |
| Bofors RP5 | <<locked>> | 94% | 56,173 psi | 88% | 2507 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 56,449 psi | 88% | 2395 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,535 psi | 87% | 2503 fps | 100% |
| Hodgdon H414 | <<locked>> | 84% | 55,680 psi | 87% | 2444 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 54,897 psi | 86% | 2408 fps | 100% |
| Hodgdon H4831 | <<locked>> | 92% | 56,144 psi | 88% | 2457 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 55,013 psi | 86% | 2441 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 55,463 psi | 87% | 2375 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,579 psi | 87% | 2602 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 56,043 psi | 88% | 2480 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,231 psi | 58% | 1476 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 54,520 psi | 85% | 2388 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,711 psi | 90% | 2411 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 54,491 psi | 85% | 2388 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 57,145 psi | 90% | 2438 fps | 99.6% |
| IMR 7828 SSC | <<locked>> | 94% | 54,070 psi | 85% | 2493 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 40,495 psi | 63% | 2326 fps | 98% |
| Lovex S065 | <<locked>> | 84% | 55,143 psi | 86% | 2369 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,652 psi | 89% | 2411 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 2434 fps | 100% |
| Norma 204 | <<locked>> | 86% | 55,434 psi | 87% | 2441 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 40,553 psi | 64% | 2349 fps | 99.6% |
| Norma MRP | <<locked>> | 92% | 56,057 psi | 88% | 2523 fps | 100% |
| Norma URP | <<locked>> | 86% | 56,144 psi | 88% | 2425 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,839 psi | 86% | 2513 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 86% | 55,013 psi | 86% | 2438 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 57,000 psi | 89% | 2503 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,232 psi | 60% | 1516 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 54,070 psi | 85% | 2418 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 56,246 psi | 88% | 2493 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 56,304 psi | 88% | 2602 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 51,024 psi | 80% | 2513 fps | 99% |
| Rottweil R 904 | <<locked>> | 90% | 55,970 psi | 88% | 2428 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 92% | 57,537 psi | 90% | 2480 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 56,449 psi | 88% | 2395 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 55,143 psi | 86% | 2369 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,652 psi | 89% | 2411 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 57,508 psi | 90% | 2267 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,653 psi | 90% | 2372 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 57,101 psi | 89% | 2477 fps | 100% |
| Somchem S355 | <<locked>> | 82% | 57,551 psi | 90% | 2379 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,363 psi | 90% | 2425 fps | 99.5% |
| Somchem S365 | <<locked>> | 88% | 56,724 psi | 89% | 2425 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 54,331 psi | 85% | 2411 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 55,100 psi | 86% | 2313 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 54,491 psi | 85% | 2375 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,392 psi | 90% | 2438 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 55,854 psi | 88% | 2454 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 86% | 57,029 psi | 89% | 2425 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 56,260 psi | 88% | 2451 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,854 psi | 88% | 2526 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 98% | 55,622 psi | 87% | 2510 fps | 99.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 52,344 psi | 82% | 2516 fps | 98.7% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 49,327 psi | 77% | 2507 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 57,261 psi | 90% | 2379 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,912 psi | 88% | 2448 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 55,521 psi | 87% | 2549 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 54,128 psi | 85% | 2408 fps | 99.9% |
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% | 35,520 psi | 56% | 2110 fps | 99.2% |
| Accurate 4350 | <<locked>> | 80% | 47,413 psi | 74% | 2306 fps | 100% |
| Accurate MAGPRO | 69.2 gr | 80% | 36,158 psi | 57% | 2205 fps | 95% |
| ADI AR 2209 | <<locked>> | 80% | 39,581 psi | 62% | 2218 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 80% | 35,215 psi | 55% | 2159 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 88% | 33,968 psi | 53% | 2136 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 84% | 27,021 psi | 42% | 2011 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 45,440 psi | 71% | 2313 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 52,431 psi | 82% | 2408 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,552 psi | 62% | 2215 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 35,360 psi | 55% | 2172 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 34,156 psi | 54% | 2133 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,718 psi | 47% | 2073 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,333 psi | 59% | 2260 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 43,062 psi | 67% | 2388 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 45,136 psi | 71% | 2290 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 32,982 psi | 52% | 2119 fps | 96.4% |
| Bofors RP30 | <<locked>> | 86% | 33,040 psi | 52% | 2156 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 35,360 psi | 55% | 2172 fps | 97.3% |
| Bofors RP7 | <<locked>> | 80% | 49,864 psi | 78% | 2306 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 32,430 psi | 51% | 2103 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 48,936 psi | 77% | 2352 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 51,430 psi | 81% | 2362 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 80% | 37,507 psi | 59% | 2165 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 36,912 psi | 58% | 2152 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,931 psi | 67% | 2211 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 80% | 29,008 psi | 45% | 2087 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 48,544 psi | 76% | 2382 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,891 psi | 44% | 1319 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 45,353 psi | 71% | 2257 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 51,140 psi | 80% | 2326 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 45,107 psi | 71% | 2264 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 39,407 psi | 62% | 2165 fps | 96.6% |
| IMR 7828 SSC | <<locked>> | 80% | 33,953 psi | 53% | 2142 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 94% | 33,344 psi | 52% | 2182 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 48,820 psi | 77% | 2283 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 47,137 psi | 74% | 2280 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 30,734 psi | 48% | 2014 fps | 98.1% |
| Norma 204 | <<locked>> | 80% | 45,295 psi | 71% | 2293 fps | 99.1% |
| Norma 217 | <<locked>> | 88% | 27,528 psi | 43% | 2057 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 36,912 psi | 58% | 2228 fps | 98.9% |
| Norma URP | <<locked>> | 80% | 46,441 psi | 73% | 2297 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 33,446 psi | 52% | 2146 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 45,121 psi | 71% | 2300 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 29,689 psi | 47% | 2051 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,689 psi | 45% | 1352 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 47,239 psi | 74% | 2326 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 45,498 psi | 71% | 2349 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 27,862 psi | 44% | 2064 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 38,000 psi | 60% | 2293 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 40,886 psi | 64% | 2198 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 80% | 38,928 psi | 61% | 2201 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 80% | 49,864 psi | 78% | 2306 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,820 psi | 77% | 2283 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 47,137 psi | 74% | 2280 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,244 psi | 85% | 2228 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,776 psi | 75% | 2244 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,595 psi | 60% | 2198 fps | 98.2% |
| Somchem S355 | <<locked>> | 80% | 54,099 psi | 85% | 2339 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 41,495 psi | 65% | 2192 fps | 97% |
| Somchem S365 | <<locked>> | 80% | 43,642 psi | 68% | 2260 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,450 psi | 62% | 2185 fps | 98.9% |
| Vihtavuori N150 | <<locked>> | 80% | 51,750 psi | 81% | 2274 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,863 psi | 75% | 2287 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 34,214 psi | 54% | 2083 fps | 97.4% |
| Vihtavuori N170 | <<locked>> | 98% | 52,272 psi | 82% | 2405 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 47,094 psi | 74% | 2293 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 38,276 psi | 60% | 2195 fps | 100% |
| Vihtavuori N560 | 67.9 gr | 80% | 37,101 psi | 58% | 2218 fps | 96% |
| Vihtavuori N565 | <<locked>> | 84% | 34,838 psi | 55% | 2169 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 92% | 39,566 psi | 62% | 2303 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 98% | 46,079 psi | 72% | 2454 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,847 psi | 73% | 2254 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 49,139 psi | 77% | 2356 fps | 100% |
| Winchester StaBALL HD | 67.2 gr | 80% | 30,255 psi | 47% | 2165 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,013 psi | 56% | 2126 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 81 powders for .338 Norma Mag. loaded with the .338 | 300gr | MAKER Solid Copper . Hodgdon Retumbo delivers the highest muzzle velocity at 2,602 fps; across all powders the maximum-charge window runs from 1,476 fps to 2,602 fps. ADI AR 2217 gives the best case fill at 100 %, and 81 of the 81 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 1:10.0 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. Winchester StaBALL HD, Vihtavuori N560, Accurate MAGPRO rank at the top here: for .338 Norma Mag. with the .338 | 300gr | MAKER Solid Copper they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, IMR 7977 Enduron 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.