Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 300gr | Nosler Custom Competition bullet and 74 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon H1000, Hodgdon Retumbo and ReloadSwiss RS 76.
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% | 54,389 psi | 85% | 2365 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 55,608 psi | 87% | 2382 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 56,565 psi | 89% | 2503 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 90% | 56,217 psi | 88% | 2441 fps | 100% |
| ADI AR 2213 | <<locked>> | 94% | 57,682 psi | 90% | 2497 fps | 99.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 51,779 psi | 81% | 2421 fps | 99.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 46,441 psi | 73% | 2395 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,579 psi | 89% | 2428 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,508 psi | 90% | 2434 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 55,753 psi | 87% | 2431 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 92% | 54,244 psi | 85% | 2448 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 94% | 55,535 psi | 87% | 2411 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 54,781 psi | 86% | 2470 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 56,014 psi | 88% | 2493 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 48,109 psi | 75% | 2441 fps | 96.9% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 55,434 psi | 87% | 2421 fps | 98.2% |
| Bofors RP15 | <<locked>> | 96% | 56,927 psi | 89% | 2480 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 54,447 psi | 85% | 2480 fps | 99.9% |
| Bofors RP5 | <<locked>> | 92% | 54,244 psi | 85% | 2448 fps | 100% |
| Bofors RP7 | <<locked>> | 84% | 57,522 psi | 90% | 2379 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 57,130 psi | 90% | 2487 fps | 100% |
| Hodgdon H414 | <<locked>> | 84% | 57,101 psi | 89% | 2431 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 55,999 psi | 88% | 2395 fps | 100% |
| Hodgdon H4831 | <<locked>> | 92% | 57,624 psi | 90% | 2444 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 56,492 psi | 89% | 2431 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 56,710 psi | 89% | 2359 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 57,537 psi | 90% | 2589 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 57,638 psi | 90% | 2467 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,376 psi | 59% | 1473 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 55,622 psi | 87% | 2372 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 55,347 psi | 87% | 2356 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 55,912 psi | 88% | 2375 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 54,853 psi | 86% | 2382 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 94% | 55,637 psi | 87% | 2480 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 41,887 psi | 66% | 2320 fps | 98.6% |
| Lovex S065 | <<locked>> | 84% | 56,217 psi | 88% | 2352 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 54,375 psi | 85% | 2352 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 55,521 psi | 87% | 2379 fps | 100% |
| Norma 204 | <<locked>> | 86% | 56,608 psi | 89% | 2425 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 42,206 psi | 66% | 2346 fps | 99.8% |
| Norma MRP | <<locked>> | 90% | 53,954 psi | 85% | 2464 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,595 psi | 90% | 2411 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 56,623 psi | 89% | 2500 fps | 100% |
| Ramshot Hunter | <<locked>> | 86% | 56,275 psi | 88% | 2421 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 54,708 psi | 86% | 2441 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,189 psi | 60% | 1509 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 55,564 psi | 87% | 2405 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 57,653 psi | 90% | 2474 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 54,186 psi | 85% | 2536 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 53,142 psi | 83% | 2507 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 90% | 57,348 psi | 90% | 2411 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 90% | 55,274 psi | 87% | 2421 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 57,522 psi | 90% | 2379 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 56,217 psi | 88% | 2352 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 54,375 psi | 85% | 2352 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 55,187 psi | 86% | 2316 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 54,853 psi | 86% | 2418 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 55,114 psi | 86% | 2365 fps | 99.4% |
| Somchem S365 | <<locked>> | 86% | 54,505 psi | 85% | 2369 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 55,753 psi | 87% | 2398 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 56,217 psi | 88% | 2297 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 55,666 psi | 87% | 2359 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 55,347 psi | 87% | 2382 fps | 100% |
| Vihtavuori N170ᴾ | <<locked>> | 100% | 57,624 psi | 90% | 2444 fps | 97% |
| Vihtavuori N550 | <<locked>> | 84% | 54,810 psi | 86% | 2365 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 54,389 psi | 85% | 2392 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 57,464 psi | 90% | 2513 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 98% | 57,522 psi | 90% | 2500 fps | 99.9% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 54,157 psi | 85% | 2503 fps | 99.1% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 51,227 psi | 80% | 2500 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 54,810 psi | 86% | 2320 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,334 psi | 90% | 2434 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 96% | 57,624 psi | 90% | 2533 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 55,622 psi | 87% | 2395 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% | 36,463 psi | 57% | 2103 fps | 99.5% |
| Accurate 4350 | <<locked>> | 80% | 48,602 psi | 76% | 2297 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 37,159 psi | 58% | 2198 fps | 95.6% |
| ADI AR 2209 | <<locked>> | 80% | 40,350 psi | 63% | 2208 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 80% | 36,071 psi | 57% | 2156 fps | 96.3% |
| ADI AR 2217 | <<locked>> | 86% | 32,764 psi | 51% | 2083 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 82% | 26,063 psi | 41% | 1962 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,557 psi | 73% | 2300 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 53,708 psi | 84% | 2392 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,451 psi | 63% | 2205 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 36,289 psi | 57% | 2165 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,099 psi | 55% | 2126 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,342 psi | 48% | 2064 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 38,508 psi | 60% | 2251 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 44,715 psi | 70% | 2385 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 43,424 psi | 68% | 2234 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 33,852 psi | 53% | 2113 fps | 96.9% |
| Bofors RP30 | <<locked>> | 84% | 31,850 psi | 50% | 2100 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 36,289 psi | 57% | 2165 fps | 97.8% |
| Bofors RP7 | <<locked>> | 80% | 50,836 psi | 80% | 2297 fps | 100% |
| Hodgdon H1000 | 68 gr | 82% | 31,140 psi | 49% | 2051 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 50,038 psi | 78% | 2339 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 52,475 psi | 82% | 2349 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 38,406 psi | 60% | 2156 fps | 96.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 37,811 psi | 59% | 2146 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,976 psi | 69% | 2201 fps | 100% |
| Hodgdon Retumbo | 66.1 gr | 80% | 29,747 psi | 47% | 2087 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 49,734 psi | 78% | 2365 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,934 psi | 44% | 1316 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,122 psi | 72% | 2244 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,098 psi | 82% | 2313 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 46,151 psi | 72% | 2251 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 40,089 psi | 63% | 2156 fps | 97% |
| IMR 7828 SSC | <<locked>> | 80% | 34,809 psi | 55% | 2139 fps | 96% |
| IMR 8133 Enduron | <<locked>> | 92% | 32,314 psi | 51% | 2129 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 49,792 psi | 78% | 2270 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 48,138 psi | 75% | 2270 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 31,430 psi | 49% | 2005 fps | 98.5% |
| Norma 204 | <<locked>> | 80% | 46,311 psi | 73% | 2283 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 26,687 psi | 42% | 2008 fps | 95% |
| Norma MRP | <<locked>> | 80% | 38,145 psi | 60% | 2221 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 47,529 psi | 74% | 2283 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 34,301 psi | 54% | 2142 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 80% | 46,224 psi | 72% | 2287 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 30,516 psi | 48% | 2044 fps | 96.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,718 psi | 45% | 1348 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,428 psi | 76% | 2313 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,644 psi | 73% | 2336 fps | 100% |
| ReloadSwiss RS 76 | 70.7 gr | 80% | 28,616 psi | 45% | 2060 fps | 96.6% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 36,680 psi | 57% | 2234 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 41,756 psi | 65% | 2188 fps | 98% |
| Rottweil R 905 | <<locked>> | 80% | 39,871 psi | 62% | 2192 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 80% | 50,836 psi | 80% | 2297 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,792 psi | 78% | 2270 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 48,138 psi | 75% | 2270 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,573 psi | 76% | 2231 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,537 psi | 62% | 2188 fps | 98.6% |
| Somchem S361 | <<locked>> | 80% | 42,380 psi | 66% | 2178 fps | 97.4% |
| Somchem S365 | <<locked>> | 80% | 44,628 psi | 70% | 2244 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,350 psi | 63% | 2175 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 80% | 52,823 psi | 83% | 2257 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,878 psi | 77% | 2274 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 35,085 psi | 55% | 2077 fps | 97.9% |
| Vihtavuori N170 | <<locked>> | 96% | 50,444 psi | 79% | 2349 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 48,138 psi | 75% | 2280 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,291 psi | 62% | 2185 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 38,247 psi | 60% | 2215 fps | 96.7% |
| Vihtavuori N565 | <<locked>> | 82% | 33,620 psi | 53% | 2116 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 90% | 38,159 psi | 60% | 2247 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 96% | 44,614 psi | 70% | 2395 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 47,906 psi | 75% | 2238 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,241 psi | 79% | 2343 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,227 psi | 49% | 2159 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 36,927 psi | 58% | 2119 fps | 97.8% |
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 80 powders for .338 Rem. Ultra Mag. loaded with the .338 | 300gr | Nosler Custom Competition. Hodgdon Retumbo delivers the highest muzzle velocity at 2,589 fps; across all powders the maximum-charge window runs from 1,473 fps to 2,589 fps. ADI AR 2217 gives the best case fill at 100 %, and 80 of the 80 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 57–90 %, 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 H1000, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for .338 Rem. Ultra 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.