Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 265gr | Barnes TAC-TX BT bullet and 90 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, Alliant Reloder-26 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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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 2700 | <<locked>> | 82% | 57,653 psi | 90% | 2490 fps | 99.9% |
| Accurate 3100 | <<locked>> | 98% | 57,130 psi | 90% | 2543 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 57,029 psi | 89% | 2457 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,172 psi | 86% | 2530 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 54,766 psi | 86% | 2635 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 96% | 55,854 psi | 88% | 2638 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 84% | 57,058 psi | 89% | 2497 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,159 psi | 88% | 2585 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 98% | 57,493 psi | 90% | 2638 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 44,701 psi | 70% | 2438 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,436 psi | 62% | 2402 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,260 psi | 88% | 2579 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,260 psi | 88% | 2579 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,621 psi | 86% | 2470 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,275 psi | 88% | 2582 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,406 psi | 90% | 2592 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,535 psi | 87% | 2572 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,014 psi | 89% | 2631 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,157 psi | 85% | 2552 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,125 psi | 79% | 2559 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,346 psi | 85% | 2635 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 56,130 psi | 88% | 2552 fps | 96.8% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,854 psi | 88% | 2615 fps | 99.8% |
| Bofors RP3 | <<locked>> | 82% | 55,405 psi | 87% | 2484 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 45,861 psi | 72% | 2503 fps | 98.3% |
| Bofors RP5 | <<locked>> | 98% | 57,014 psi | 89% | 2631 fps | 99.9% |
| Bofors RP7 | <<locked>> | 86% | 54,563 psi | 86% | 2484 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,400 psi | 77% | 2520 fps | 99% |
| Hodgdon H380 | <<locked>> | 82% | 55,593 psi | 87% | 2503 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,159 psi | 90% | 2582 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 56,550 psi | 89% | 2546 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 96% | 57,682 psi | 90% | 2585 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,478 psi | 89% | 2569 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,507 psi | 89% | 2507 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,921 psi | 77% | 2615 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 86% | 53,650 psi | 84% | 2566 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,825 psi | 58% | 1555 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,405 psi | 88% | 2477 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,144 psi | 88% | 2523 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,318 psi | 88% | 2510 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 55,550 psi | 87% | 2523 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,201 psi | 87% | 2520 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 98% | 55,071 psi | 86% | 2615 fps | 99.2% |
| Lovex S062 | <<locked>> | 82% | 56,782 psi | 89% | 2470 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,550 psi | 89% | 2503 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 54,636 psi | 86% | 2500 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,734 psi | 80% | 2464 fps | 100% |
| Norma 203B | <<locked>> | 82% | 57,609 psi | 90% | 2523 fps | 100% |
| Norma 204 | <<locked>> | 90% | 57,174 psi | 90% | 2575 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 34,925 psi | 55% | 2336 fps | 97.2% |
| Norma MRP | <<locked>> | 96% | 56,855 psi | 89% | 2651 fps | 100% |
| Norma URP | <<locked>> | 90% | 57,450 psi | 90% | 2562 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,680 psi | 87% | 2631 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 90% | 56,362 psi | 88% | 2572 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,766 psi | 84% | 2572 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,507 psi | 59% | 1591 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,535 psi | 87% | 2497 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,956 psi | 89% | 2582 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,216 psi | 87% | 2552 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,421 psi | 90% | 2628 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,284 psi | 77% | 2612 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 44,135 psi | 69% | 2503 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 84% | 55,724 psi | 87% | 2484 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,493 psi | 90% | 2552 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 94% | 54,810 psi | 86% | 2559 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 86% | 54,563 psi | 86% | 2484 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,550 psi | 89% | 2503 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 56,782 psi | 89% | 2470 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 54,636 psi | 86% | 2500 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,305 psi | 90% | 2536 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,115 psi | 88% | 2369 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,028 psi | 88% | 2464 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,375 psi | 85% | 2556 fps | 99.7% |
| Somchem S355 | <<locked>> | 84% | 55,419 psi | 87% | 2477 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,579 psi | 87% | 2503 fps | 98.6% |
| Somchem S365 | <<locked>> | 92% | 57,508 psi | 90% | 2559 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,477 psi | 87% | 2536 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 86% | 56,826 psi | 89% | 2454 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,854 psi | 88% | 2510 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 54,969 psi | 86% | 2516 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 82% | 57,348 psi | 90% | 2448 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 54,795 psi | 86% | 2516 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,492 psi | 89% | 2575 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,840 psi | 89% | 2651 fps | 99.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,301 psi | 82% | 2575 fps | 98.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 45,614 psi | 71% | 2513 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,317 psi | 87% | 2474 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,392 psi | 90% | 2582 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,810 psi | 86% | 2671 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,463 psi | 87% | 2533 fps | 99.6% |
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 2700 | <<locked>> | 80% | 53,954 psi | 85% | 2444 fps | 99.8% |
| Accurate 3100 | <<locked>> | 80% | 30,661 psi | 48% | 2116 fps | 96.9% |
| Accurate 4064 | <<locked>> | 80% | 53,476 psi | 84% | 2415 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,756 psi | 65% | 2339 fps | 100% |
| Accurate High Country | 71.2 gr | 84% | 38,464 psi | 60% | 2365 fps | 95.8% |
| Accurate MAGPRO | <<locked>> | 88% | 41,930 psi | 66% | 2421 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 50,488 psi | 79% | 2411 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 35,128 psi | 55% | 2231 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 86% | 38,290 psi | 60% | 2323 fps | 95.2% |
| ADI AR 2217 | <<locked>> | 96% | 39,088 psi | 61% | 2333 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 92% | 30,458 psi | 48% | 2192 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 35,418 psi | 56% | 2234 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 35,418 psi | 56% | 2234 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,242 psi | 80% | 2428 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,451 psi | 63% | 2352 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,340 psi | 73% | 2451 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 35,099 psi | 55% | 2231 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 82% | 33,011 psi | 52% | 2224 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,544 psi | 46% | 2146 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 82% | 27,615 psi | 43% | 2113 fps | 96.1% |
| Alliant Reloder-26 | 69.8 gr | 80% | 31,923 psi | 50% | 2257 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 49,603 psi | 78% | 2454 fps | 95.3% |
| Bofors RP15 | <<locked>> | 86% | 35,143 psi | 55% | 2270 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 51,895 psi | 81% | 2441 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 37,275 psi | 58% | 2346 fps | 95.9% |
| Bofors RP5 | <<locked>> | 82% | 33,011 psi | 52% | 2224 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 45,237 psi | 71% | 2349 fps | 99% |
| Hodgdon H1000 | <<locked>> | 92% | 37,420 psi | 59% | 2303 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 52,112 psi | 82% | 2461 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,787 psi | 69% | 2388 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 46,572 psi | 73% | 2402 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 40,843 psi | 64% | 2326 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 86% | 40,147 psi | 63% | 2313 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,826 psi | 59% | 2247 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 32,793 psi | 51% | 2280 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 42,830 psi | 67% | 2405 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,470 psi | 43% | 1388 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,142 psi | 83% | 2438 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,756 psi | 64% | 2287 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,717 psi | 73% | 2372 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 39,842 psi | 62% | 2293 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 40,118 psi | 63% | 2280 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 88% | 39,262 psi | 62% | 2356 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 53,287 psi | 84% | 2428 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,961 psi | 69% | 2323 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 42,395 psi | 66% | 2316 fps | 99.1% |
| Lovex S071 | <<locked>> | 82% | 28,094 psi | 44% | 2057 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 54,070 psi | 85% | 2477 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,509 psi | 63% | 2320 fps | 97.2% |
| Norma 217 | <<locked>> | 96% | 30,589 psi | 48% | 2228 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 32,111 psi | 50% | 2231 fps | 96.2% |
| Norma URP | <<locked>> | 80% | 41,394 psi | 65% | 2336 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 36,158 psi | 57% | 2303 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 40,190 psi | 63% | 2329 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 31,908 psi | 50% | 2195 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,992 psi | 44% | 1421 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,996 psi | 81% | 2448 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,226 psi | 77% | 2487 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,727 psi | 65% | 2362 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,161 psi | 63% | 2375 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 31,923 psi | 50% | 2260 fps | 96.3% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 40,843 psi | 64% | 2441 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 48,878 psi | 77% | 2398 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 38,972 psi | 61% | 2264 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 34,229 psi | 54% | 2215 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 45,237 psi | 71% | 2349 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,961 psi | 69% | 2323 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 53,287 psi | 84% | 2428 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,395 psi | 66% | 2316 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,314 psi | 79% | 2448 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,501 psi | 78% | 2293 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,076 psi | 68% | 2280 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 33,910 psi | 53% | 2208 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 48,791 psi | 76% | 2392 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 39,595 psi | 62% | 2254 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 37,971 psi | 60% | 2293 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,766 psi | 54% | 2201 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 80% | 46,847 psi | 73% | 2329 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,830 psi | 67% | 2329 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 32,068 psi | 50% | 2139 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 53,925 psi | 85% | 2408 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,134 psi | 66% | 2333 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 33,112 psi | 52% | 2208 fps | 99.4% |
| Vihtavuori N560 | 72.9 gr | 86% | 40,176 psi | 63% | 2382 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 92% | 39,566 psi | 62% | 2365 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 98% | 42,511 psi | 67% | 2457 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,785 psi | 65% | 2297 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,787 psi | 69% | 2388 fps | 99.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,107 psi | 41% | 2149 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 33,895 psi | 53% | 2182 fps | 95.2% |
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 90 powders for .338 Rem. Ultra Mag. loaded with the .338 | 265gr | Barnes TAC-TX BT. Winchester StaBALL HD delivers the highest muzzle velocity at 2,671 fps; across all powders the maximum-charge window runs from 1,555 fps to 2,671 fps. ADI AR 2217 gives the best case fill at 100 %, and 90 of the 90 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 265.0 gr projectile in 0.338" calls for a 1:10.5 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. Accurate High Country, Alliant Reloder-26, Vihtavuori N560 rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 265gr | Barnes TAC-TX BT 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.