Load Specifications
Load data in caliber .338 Norma Mag. with .338 | 300gr | Berger Hybrid Target bullet and 75 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% | 54,911 psi | 86% | 2411 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,115 psi | 88% | 2428 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,101 psi | 89% | 2556 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 90% | 56,855 psi | 89% | 2490 fps | 100% |
| ADI AR 2213 | <<locked>> | 92% | 54,534 psi | 85% | 2500 fps | 99.8% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,373 psi | 82% | 2474 fps | 99.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,920 psi | 74% | 2448 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 57,014 psi | 89% | 2487 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 57,014 psi | 89% | 2487 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 57,087 psi | 89% | 2474 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 56,333 psi | 88% | 2480 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,708 psi | 86% | 2497 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 94% | 56,101 psi | 88% | 2461 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 55,521 psi | 87% | 2523 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,608 psi | 89% | 2546 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 48,486 psi | 76% | 2493 fps | 96.9% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,709 psi | 87% | 2470 fps | 98.2% |
| Bofors RP15 | <<locked>> | 96% | 57,363 psi | 90% | 2530 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 55,085 psi | 86% | 2533 fps | 99.9% |
| Bofors RP5 | <<locked>> | 92% | 54,708 psi | 86% | 2497 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 54,607 psi | 86% | 2385 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,696 psi | 90% | 2543 fps | 100% |
| Hodgdon H414 | <<locked>> | 84% | 57,696 psi | 90% | 2480 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 56,507 psi | 89% | 2441 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 54,360 psi | 85% | 2444 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,927 psi | 89% | 2477 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,377 psi | 90% | 2405 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 54,447 psi | 85% | 2598 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 54,041 psi | 85% | 2464 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,434 psi | 59% | 1493 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,159 psi | 88% | 2418 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,840 psi | 88% | 2398 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 56,333 psi | 88% | 2418 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 55,405 psi | 87% | 2428 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 94% | 56,304 psi | 88% | 2533 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 42,496 psi | 67% | 2372 fps | 98.6% |
| Lovex S065 | <<locked>> | 84% | 56,695 psi | 89% | 2398 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,042 psi | 86% | 2402 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,999 psi | 88% | 2425 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,305 psi | 90% | 2474 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 42,641 psi | 67% | 2392 fps | 99.9% |
| Norma MRP | <<locked>> | 90% | 54,621 psi | 86% | 2513 fps | 100% |
| Norma URP | <<locked>> | 84% | 54,636 psi | 86% | 2415 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,203 psi | 90% | 2552 fps | 100% |
| Ramshot Hunter | <<locked>> | 86% | 56,913 psi | 89% | 2470 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 55,288 psi | 87% | 2493 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,247 psi | 60% | 1529 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 56,072 psi | 88% | 2451 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 54,273 psi | 85% | 2477 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,752 psi | 86% | 2592 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,563 psi | 84% | 2559 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 88% | 54,201 psi | 85% | 2415 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 90% | 55,898 psi | 88% | 2470 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 54,607 psi | 86% | 2385 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,695 psi | 89% | 2398 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,042 psi | 86% | 2402 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,796 psi | 87% | 2362 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 55,477 psi | 87% | 2467 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,463 psi | 87% | 2411 fps | 99.4% |
| Somchem S365 | <<locked>> | 86% | 55,172 psi | 86% | 2415 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 56,318 psi | 88% | 2444 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 56,753 psi | 89% | 2343 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,144 psi | 88% | 2405 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,782 psi | 87% | 2431 fps | 100% |
| Vihtavuori N170 | <<locked>> | 98% | 54,331 psi | 85% | 2448 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 84% | 55,390 psi | 87% | 2415 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 54,882 psi | 86% | 2441 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 54,389 psi | 85% | 2516 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 96% | 54,230 psi | 85% | 2503 fps | 99.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,723 psi | 86% | 2559 fps | 99.2% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 51,851 psi | 81% | 2556 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 55,390 psi | 87% | 2369 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,696 psi | 90% | 2480 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 54,201 psi | 85% | 2539 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,028 psi | 88% | 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% | 36,985 psi | 58% | 2146 fps | 99.5% |
| Accurate 4350 | <<locked>> | 80% | 49,255 psi | 77% | 2339 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 37,695 psi | 59% | 2244 fps | 95.8% |
| ADI AR 2209 | <<locked>> | 80% | 40,901 psi | 64% | 2251 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 80% | 36,492 psi | 57% | 2198 fps | 96.4% |
| ADI AR 2217 | <<locked>> | 86% | 33,054 psi | 52% | 2126 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 82% | 26,353 psi | 41% | 2001 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,365 psi | 65% | 2254 fps | 98.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 41,365 psi | 65% | 2254 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,079 psi | 74% | 2343 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,988 psi | 64% | 2247 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,811 psi | 58% | 2208 fps | 97.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,563 psi | 56% | 2165 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,806 psi | 48% | 2106 fps | 99% |
| Alliant Reloder-26 | <<locked>> | 80% | 39,073 psi | 61% | 2297 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 42,047 psi | 66% | 2379 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 43,642 psi | 68% | 2277 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 34,243 psi | 54% | 2152 fps | 97% |
| Bofors RP30 | <<locked>> | 84% | 32,213 psi | 50% | 2142 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 36,811 psi | 58% | 2208 fps | 97.9% |
| Bofors RP7 | <<locked>> | 80% | 51,256 psi | 80% | 2339 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 31,502 psi | 49% | 2090 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 80% | 50,546 psi | 79% | 2385 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 53,040 psi | 83% | 2395 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 38,870 psi | 61% | 2198 fps | 96.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 38,261 psi | 60% | 2188 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,469 psi | 70% | 2241 fps | 100% |
| Hodgdon Retumbo | 67.7 gr | 80% | 30,037 psi | 47% | 2126 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 50,415 psi | 79% | 2418 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,065 psi | 44% | 1332 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,688 psi | 73% | 2290 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,475 psi | 82% | 2356 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 46,601 psi | 73% | 2293 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,567 psi | 64% | 2198 fps | 97.2% |
| IMR 7828 SSC | <<locked>> | 80% | 35,128 psi | 55% | 2178 fps | 96.1% |
| IMR 8133 Enduron | <<locked>> | 92% | 32,750 psi | 51% | 2175 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 50,198 psi | 79% | 2313 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,530 psi | 76% | 2313 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 31,908 psi | 50% | 2044 fps | 98.6% |
| Norma 204 | <<locked>> | 80% | 46,963 psi | 74% | 2329 fps | 99.5% |
| Norma 217 | <<locked>> | 86% | 26,977 psi | 42% | 2047 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 38,566 psi | 60% | 2264 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 47,950 psi | 75% | 2326 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 34,708 psi | 54% | 2185 fps | 96.4% |
| Ramshot Hunter | <<locked>> | 80% | 46,833 psi | 73% | 2333 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 30,951 psi | 49% | 2087 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,674 psi | 45% | 1362 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,081 psi | 77% | 2362 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,079 psi | 74% | 2379 fps | 100% |
| ReloadSwiss RS 76 | 72.5 gr | 80% | 28,979 psi | 45% | 2103 fps | 96.8% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 37,101 psi | 58% | 2280 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 42,148 psi | 66% | 2228 fps | 98% |
| Rottweil R 905 | <<locked>> | 80% | 40,263 psi | 63% | 2234 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 80% | 51,256 psi | 80% | 2339 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,198 psi | 79% | 2313 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,530 psi | 76% | 2313 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,081 psi | 77% | 2274 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,929 psi | 63% | 2231 fps | 98.6% |
| Somchem S361 | <<locked>> | 80% | 42,685 psi | 67% | 2221 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 45,266 psi | 71% | 2290 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,872 psi | 64% | 2218 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 80% | 53,243 psi | 83% | 2300 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,487 psi | 78% | 2320 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,534 psi | 56% | 2116 fps | 98% |
| Vihtavuori N170 | <<locked>> | 96% | 50,749 psi | 80% | 2395 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 48,646 psi | 76% | 2326 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,769 psi | 62% | 2224 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 38,638 psi | 61% | 2257 fps | 96.7% |
| Vihtavuori N565 | <<locked>> | 82% | 33,968 psi | 53% | 2156 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 90% | 38,667 psi | 61% | 2297 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 96% | 44,976 psi | 70% | 2441 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,399 psi | 76% | 2283 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,763 psi | 80% | 2388 fps | 100% |
| Winchester StaBALL HD | 69.6 gr | 80% | 31,923 psi | 50% | 2205 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,362 psi | 59% | 2159 fps | 97.9% |
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 75 powders for .338 Norma Mag. loaded with the .338 | 300gr | Berger Hybrid Target. Hodgdon Retumbo delivers the highest muzzle velocity at 2,598 fps; across all powders the maximum-charge window runs from 1,493 fps to 2,598 fps. ADI AR 2217 gives the best case fill at 100 %, and 75 of the 75 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 300.0 gr projectile in 0.338" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-33 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 | Berger Hybrid Target 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.