Load Specifications
Bullet Manufacturer:Berger
Bullet Weight:250 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338 Rem. Ultra Mag. load data
Case Length (l3):2.76"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:110 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:24"
Max. allowed Pressure:63,817 psi
Recommended Twist Rate:1:11.5
Load data in caliber .338 Rem. Ultra Mag. with .338 | 250gr | Berger Hybrid OTM Tactical bullet and 83 powders. The key underlying parameters are shown in the table above.
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>> | 96% | 54,810 psi | 86% | 2592 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 56,652 psi | 89% | 2625 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 56,246 psi | 88% | 2730 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 96% | 57,261 psi | 90% | 2733 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 82% | 54,505 psi | 85% | 2543 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 57,261 psi | 90% | 2677 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 96% | 54,882 psi | 86% | 2677 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 45,934 psi | 72% | 2530 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,770 psi | 64% | 2493 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 57,392 psi | 90% | 2671 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,666 psi | 87% | 2562 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 57,377 psi | 90% | 2674 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,665 psi | 86% | 2638 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,652 psi | 89% | 2664 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,636 psi | 86% | 2674 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 98% | 55,550 psi | 87% | 2644 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 51,416 psi | 81% | 2654 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 56,014 psi | 88% | 2730 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 57,203 psi | 90% | 2641 fps | 96.7% |
| Bofors RP15ᴾ | <<locked>> | 100% | 57,232 psi | 90% | 2710 fps | 99.7% |
| Bofors RP3 | <<locked>> | 82% | 56,724 psi | 89% | 2579 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 47,224 psi | 74% | 2592 fps | 98.2% |
| Bofors RP5 | <<locked>> | 96% | 54,636 psi | 86% | 2674 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 55,738 psi | 87% | 2579 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,705 psi | 79% | 2608 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 82% | 56,869 psi | 89% | 2598 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,766 psi | 86% | 2628 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 57,464 psi | 90% | 2635 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 94% | 54,955 psi | 86% | 2621 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 96% | 57,624 psi | 90% | 2657 fps | 98.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,653 psi | 90% | 2598 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 50,328 psi | 79% | 2710 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 86% | 54,926 psi | 86% | 2661 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,927 psi | 58% | 1617 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 57,392 psi | 90% | 2569 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 57,072 psi | 89% | 2612 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 57,261 psi | 90% | 2598 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 56,942 psi | 89% | 2615 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 56,231 psi | 88% | 2608 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 98% | 56,376 psi | 88% | 2710 fps | 99.1% |
| Lovex S065 | <<locked>> | 88% | 57,638 psi | 90% | 2595 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,709 psi | 87% | 2592 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 52,286 psi | 82% | 2556 fps | 100% |
| Norma 204 | <<locked>> | 88% | 54,447 psi | 85% | 2615 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 36,216 psi | 57% | 2425 fps | 97.2% |
| Norma MRP | <<locked>> | 94% | 54,404 psi | 85% | 2697 fps | 100% |
| Norma URP | <<locked>> | 88% | 54,926 psi | 86% | 2608 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 57,087 psi | 89% | 2726 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 90% | 57,363 psi | 90% | 2661 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 55,172 psi | 86% | 2667 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,608 psi | 59% | 1654 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,594 psi | 89% | 2589 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 54,288 psi | 85% | 2628 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 56,449 psi | 88% | 2644 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,665 psi | 86% | 2671 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,749 psi | 80% | 2707 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 45,571 psi | 71% | 2595 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 84% | 57,029 psi | 89% | 2575 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,984 psi | 86% | 2595 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 94% | 56,101 psi | 88% | 2654 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 86% | 55,738 psi | 87% | 2579 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,638 psi | 90% | 2595 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,709 psi | 87% | 2592 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,737 psi | 86% | 2585 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,087 psi | 89% | 2457 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 57,116 psi | 90% | 2552 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,651 psi | 87% | 2648 fps | 99.6% |
| Somchem S355 | <<locked>> | 84% | 56,652 psi | 89% | 2569 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,594 psi | 89% | 2589 fps | 98.5% |
| Somchem S365 | <<locked>> | 90% | 54,969 psi | 86% | 2608 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,739 psi | 89% | 2628 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 54,433 psi | 85% | 2500 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 57,000 psi | 89% | 2602 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 56,086 psi | 88% | 2608 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 56,101 psi | 88% | 2608 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 54,505 psi | 85% | 2628 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 54,346 psi | 85% | 2690 fps | 98.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,809 psi | 84% | 2667 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 47,036 psi | 74% | 2605 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 56,376 psi | 88% | 2562 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,766 psi | 86% | 2628 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 56,594 psi | 89% | 2769 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,782 psi | 89% | 2625 fps | 99.6% |
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 32,024 psi | 50% | 2205 fps | 97% |
| Accurate 4350 | <<locked>> | 80% | 43,149 psi | 68% | 2431 fps | 100% |
| Accurate High Country | <<locked>> | 84% | 39,726 psi | 62% | 2454 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 88% | 43,221 psi | 68% | 2510 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 51,329 psi | 80% | 2500 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 36,114 psi | 57% | 2316 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 86% | 39,218 psi | 61% | 2405 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 96% | 40,335 psi | 63% | 2421 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 92% | 31,633 psi | 50% | 2280 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 36,419 psi | 57% | 2320 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,417 psi | 82% | 2520 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,365 psi | 65% | 2438 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 47,601 psi | 75% | 2543 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 36,085 psi | 57% | 2313 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 82% | 34,127 psi | 53% | 2310 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,734 psi | 48% | 2231 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 80% | 26,919 psi | 42% | 2146 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,301 psi | 52% | 2349 fps | 98.8% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 50,560 psi | 79% | 2539 fps | 95.1% |
| Bofors RP15 | <<locked>> | 86% | 36,303 psi | 57% | 2356 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 53,127 psi | 83% | 2533 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 38,566 psi | 60% | 2434 fps | 95.9% |
| Bofors RP5 | <<locked>> | 82% | 34,127 psi | 53% | 2310 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 46,180 psi | 72% | 2434 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 92% | 38,566 psi | 60% | 2388 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 53,156 psi | 83% | 2549 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,744 psi | 70% | 2474 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 47,471 psi | 74% | 2487 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 86% | 41,916 psi | 66% | 2415 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 41,104 psi | 64% | 2398 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,059 psi | 61% | 2336 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 34,011 psi | 53% | 2372 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 43,918 psi | 69% | 2490 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,673 psi | 43% | 1447 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 54,027 psi | 85% | 2526 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,727 psi | 65% | 2375 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,645 psi | 75% | 2457 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 41,089 psi | 64% | 2382 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 41,162 psi | 65% | 2365 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 88% | 40,306 psi | 63% | 2441 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 45,150 psi | 71% | 2415 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 43,395 psi | 68% | 2402 fps | 99% |
| Lovex S071 | <<locked>> | 80% | 27,572 psi | 43% | 2096 fps | 95% |
| Norma 204 | <<locked>> | 80% | 41,524 psi | 65% | 2405 fps | 97.1% |
| Norma 217 | <<locked>> | 96% | 31,879 psi | 50% | 2320 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 33,214 psi | 52% | 2316 fps | 96.2% |
| Norma URP | <<locked>> | 80% | 42,380 psi | 66% | 2421 fps | 99.9% |
| Ramshot Grand | <<locked>> | 88% | 39,856 psi | 62% | 2444 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 41,278 psi | 65% | 2418 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 33,098 psi | 52% | 2280 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,195 psi | 44% | 1480 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,982 psi | 83% | 2536 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 50,488 psi | 79% | 2582 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,888 psi | 67% | 2448 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,263 psi | 65% | 2464 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 30,922 psi | 48% | 2290 fps | 95% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 42,424 psi | 66% | 2536 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 50,053 psi | 78% | 2487 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 40,045 psi | 63% | 2352 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 35,215 psi | 55% | 2297 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 46,180 psi | 72% | 2434 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,150 psi | 71% | 2415 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 43,395 psi | 68% | 2402 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 51,358 psi | 80% | 2536 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,517 psi | 79% | 2379 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,135 psi | 69% | 2365 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 34,882 psi | 55% | 2290 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 50,038 psi | 78% | 2484 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 43,497 psi | 68% | 2388 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 39,204 psi | 61% | 2382 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,882 psi | 56% | 2287 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 80% | 47,805 psi | 75% | 2415 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,903 psi | 69% | 2415 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 33,170 psi | 52% | 2221 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 43,149 psi | 68% | 2418 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 34,360 psi | 54% | 2297 fps | 99.4% |
| Vihtavuori N560 | <<locked>> | 86% | 41,249 psi | 65% | 2470 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 92% | 41,104 psi | 64% | 2457 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 98% | 43,830 psi | 69% | 2549 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,786 psi | 67% | 2382 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,933 psi | 70% | 2477 fps | 99.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,267 psi | 43% | 2241 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 35,070 psi | 55% | 2270 fps | 95.2% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 83 powders for .338 Rem. Ultra Mag. loaded with the .338 | 250gr | Berger Hybrid OTM Tactical. Winchester StaBALL HD delivers the highest muzzle velocity at 2,769 fps; across all powders the maximum-charge window runs from 1,617 fps to 2,769 fps. ADI AR 2217 gives the best case fill at 100 %, and 83 of the 83 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 250.0 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 2225, Alliant Reloder-25 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.