Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 280gr | Discreet Ballistics Recce Machined Solid Copper bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, IMR 7828 SSC and Vihtavuori N560.
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>> | 94% | 54,505 psi | 85% | 2444 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,869 psi | 88% | 2467 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 56,681 psi | 89% | 2585 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 82% | 57,043 psi | 89% | 2428 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,565 psi | 89% | 2523 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 94% | 54,273 psi | 85% | 2530 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,617 psi | 76% | 2444 fps | 98.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,250 psi | 68% | 2418 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,855 psi | 89% | 2513 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,070 psi | 85% | 2480 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 55,999 psi | 88% | 2513 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,273 psi | 85% | 2526 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,434 psi | 87% | 2493 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,505 psi | 85% | 2549 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 55,796 psi | 87% | 2579 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,159 psi | 88% | 2497 fps | 97.5% |
| Bofors RP15 | <<locked>> | 98% | 56,956 psi | 89% | 2562 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 50,691 psi | 79% | 2510 fps | 99.4% |
| Bofors RP5 | <<locked>> | 94% | 54,273 psi | 85% | 2526 fps | 99.9% |
| Bofors RP7 | <<locked>> | 84% | 54,810 psi | 86% | 2425 fps | 100% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,635 psi | 84% | 2516 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 86% | 57,725 psi | 90% | 2520 fps | 100% |
| Hodgdon H4350 | <<locked>> | 84% | 56,594 psi | 89% | 2480 fps | 100% |
| Hodgdon H4831 | <<locked>> | 92% | 54,201 psi | 85% | 2477 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 94% | 56,869 psi | 89% | 2510 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,087 psi | 89% | 2444 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,490 psi | 84% | 2618 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 54,186 psi | 85% | 2507 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,144 psi | 58% | 1519 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,391 psi | 88% | 2461 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,304 psi | 88% | 2444 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 56,275 psi | 88% | 2461 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,376 psi | 87% | 2461 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 96% | 55,709 psi | 87% | 2559 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 38,885 psi | 61% | 2336 fps | 97% |
| Lovex S065 | <<locked>> | 86% | 56,884 psi | 89% | 2438 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,114 psi | 86% | 2441 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,419 psi | 87% | 2457 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,305 psi | 90% | 2510 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 38,841 psi | 61% | 2356 fps | 99% |
| Norma MRP | <<locked>> | 92% | 54,012 psi | 85% | 2546 fps | 100% |
| Norma URP | <<locked>> | 86% | 54,476 psi | 85% | 2454 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,507 psi | 89% | 2579 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 88% | 56,710 psi | 89% | 2507 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 54,752 psi | 86% | 2520 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,913 psi | 59% | 1555 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,522 psi | 90% | 2510 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,898 psi | 88% | 2490 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,070 psi | 85% | 2516 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,056 psi | 85% | 2615 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 48,863 psi | 77% | 2520 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 82% | 56,130 psi | 88% | 2418 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,201 psi | 85% | 2448 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 92% | 55,709 psi | 87% | 2507 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 84% | 54,810 psi | 86% | 2425 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,884 psi | 89% | 2438 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,114 psi | 86% | 2441 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,508 psi | 90% | 2467 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,999 psi | 88% | 2303 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,159 psi | 88% | 2402 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,274 psi | 87% | 2500 fps | 99.9% |
| Somchem S355 | <<locked>> | 82% | 55,854 psi | 88% | 2411 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,738 psi | 87% | 2444 fps | 99% |
| Somchem S365 | <<locked>> | 88% | 54,781 psi | 86% | 2454 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 55,999 psi | 88% | 2477 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 56,913 psi | 89% | 2385 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,115 psi | 88% | 2444 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,593 psi | 87% | 2461 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 55,172 psi | 86% | 2451 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,331 psi | 85% | 2477 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 57,667 psi | 90% | 2592 fps | 99.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 57,348 psi | 90% | 2575 fps | 99.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 50,227 psi | 79% | 2526 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,564 psi | 87% | 2408 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 57,725 psi | 90% | 2520 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 98% | 56,971 psi | 89% | 2615 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 55,956 psi | 88% | 2477 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% | 34,069 psi | 53% | 2129 fps | 98.5% |
| Accurate 4350 | <<locked>> | 80% | 45,672 psi | 72% | 2333 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 39,914 psi | 63% | 2320 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 53,606 psi | 84% | 2385 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,014 psi | 60% | 2234 fps | 97.3% |
| ADI AR 2213 | <<locked>> | 82% | 36,390 psi | 57% | 2224 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 90% | 35,027 psi | 55% | 2195 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 88% | 29,472 psi | 46% | 2116 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,772 psi | 69% | 2339 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,444 psi | 79% | 2434 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,101 psi | 60% | 2231 fps | 97.4% |
| Alliant Reloder-22 | <<locked>> | 80% | 33,910 psi | 53% | 2182 fps | 96.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,735 psi | 51% | 2152 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,485 psi | 45% | 2080 fps | 97.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,592 psi | 56% | 2274 fps | 99.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 46,688 psi | 73% | 2352 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 31,647 psi | 50% | 2133 fps | 95.1% |
| Bofors RP30 | <<locked>> | 88% | 33,866 psi | 53% | 2211 fps | 95.4% |
| Bofors RP5 | <<locked>> | 80% | 33,910 psi | 53% | 2182 fps | 96.2% |
| Bofors RP7 | <<locked>> | 80% | 48,414 psi | 76% | 2333 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 33,460 psi | 52% | 2162 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 47,239 psi | 74% | 2375 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 49,821 psi | 78% | 2385 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 82% | 38,754 psi | 61% | 2231 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 82% | 38,130 psi | 60% | 2218 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,379 psi | 65% | 2241 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 84% | 31,749 psi | 50% | 2198 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 46,673 psi | 73% | 2402 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,862 psi | 44% | 1358 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,787 psi | 69% | 2280 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,676 psi | 78% | 2352 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 43,511 psi | 68% | 2290 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 38,014 psi | 60% | 2182 fps | 95.5% |
| IMR 7828 SSC | 69.1 gr | 84% | 37,391 psi | 59% | 2257 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 96% | 34,185 psi | 54% | 2238 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 47,355 psi | 74% | 2313 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 45,672 psi | 72% | 2306 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 29,370 psi | 46% | 2024 fps | 97.1% |
| Norma 204 | <<locked>> | 80% | 43,743 psi | 69% | 2313 fps | 98.5% |
| Norma 217 | <<locked>> | 92% | 29,994 psi | 47% | 2159 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 35,491 psi | 56% | 2244 fps | 98.1% |
| Norma URP | <<locked>> | 80% | 44,846 psi | 70% | 2323 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 34,418 psi | 54% | 2208 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 43,511 psi | 68% | 2323 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 30,661 psi | 48% | 2110 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,442 psi | 45% | 1391 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,606 psi | 84% | 2467 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,498 psi | 71% | 2352 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,743 psi | 69% | 2369 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 82% | 28,601 psi | 45% | 2119 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 39,204 psi | 61% | 2352 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 52,692 psi | 83% | 2375 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 39,552 psi | 62% | 2215 fps | 96.6% |
| Rottweil R 905 | <<locked>> | 80% | 37,420 psi | 59% | 2218 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 80% | 48,414 psi | 76% | 2333 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,355 psi | 74% | 2313 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 45,672 psi | 72% | 2306 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 53,896 psi | 84% | 2425 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,576 psi | 82% | 2264 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,209 psi | 72% | 2267 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,086 psi | 58% | 2215 fps | 97.3% |
| Somchem S355 | <<locked>> | 80% | 52,504 psi | 82% | 2372 fps | 100% |
| Somchem S361 | <<locked>> | 80% | 40,132 psi | 63% | 2205 fps | 96% |
| Somchem S365 | <<locked>> | 80% | 41,727 psi | 65% | 2283 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,971 psi | 60% | 2205 fps | 98.2% |
| Vihtavuori N150 | <<locked>> | 80% | 50,198 psi | 79% | 2306 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,209 psi | 72% | 2316 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 32,909 psi | 52% | 2100 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 80% | 45,527 psi | 71% | 2320 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 36,680 psi | 57% | 2215 fps | 100% |
| Vihtavuori N560 | 70.1 gr | 82% | 38,319 psi | 60% | 2283 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 86% | 35,708 psi | 56% | 2228 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 94% | 40,683 psi | 64% | 2362 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,237 psi | 71% | 2280 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,456 psi | 74% | 2379 fps | 99.9% |
| Winchester StaBALL HD | 67.6 gr | 80% | 28,993 psi | 45% | 2175 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 34,650 psi | 54% | 2139 fps | 96.3% |
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 82 powders for .338 Rem. Ultra Mag. loaded with the .338 | 280gr | Discreet Ballistics Recce Machined Solid Copper. Hodgdon Retumbo delivers the highest muzzle velocity at 2,618 fps; across all powders the maximum-charge window runs from 1,519 fps to 2,618 fps. ADI AR 2217 gives the best case fill at 100 %, and 82 of the 82 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 280.0 gr projectile in 0.338" calls for a 1:11.5 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, IMR 7828 SSC, Vihtavuori N560 rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 280gr | Discreet Ballistics Recce Machined 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-33, 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.