Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 224gr | TWENTY-NINE ERTP bullet and 93 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country and Norma MRP.
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 2495 | <<locked>> | 82% | 57,566 psi | 90% | 2631 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 54,926 psi | 86% | 2657 fps | 99.2% |
| Accurate 3100ᴾ | <<locked>> | 100% | 57,711 psi | 90% | 2756 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 54,549 psi | 85% | 2641 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 55,637 psi | 87% | 2749 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 55,013 psi | 86% | 2841 fps | 98.2% |
| Accurate MAGPRO | <<locked>> | 98% | 55,941 psi | 88% | 2841 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 84% | 54,462 psi | 85% | 2674 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,536 psi | 89% | 2792 fps | 99% |
| ADI AR 2213 | <<locked>> | 98% | 54,317 psi | 85% | 2789 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,362 psi | 59% | 2523 fps | 96.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,624 psi | 90% | 2841 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 56,623 psi | 89% | 2789 fps | 99% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 56,623 psi | 89% | 2789 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 55,332 psi | 87% | 2694 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 55,521 psi | 87% | 2717 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,405 psi | 88% | 2802 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,954 psi | 85% | 2769 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 55,854 psi | 88% | 2779 fps | 99% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,290 psi | 90% | 2841 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,172 psi | 85% | 2769 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 46,949 psi | 74% | 2710 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,447 psi | 85% | 2851 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,359 psi | 82% | 2769 fps | 98.6% |
| Bofors RP3 | <<locked>> | 84% | 56,405 psi | 88% | 2710 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,290 psi | 90% | 2841 fps | 99.3% |
| Bofors RP7 | <<locked>> | 88% | 55,521 psi | 87% | 2700 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 46,557 psi | 73% | 2651 fps | 96.9% |
| Hodgdon H380 | <<locked>> | 84% | 56,478 psi | 89% | 2726 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 57,696 psi | 90% | 2799 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 88% | 57,159 psi | 90% | 2759 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 96% | 54,404 psi | 85% | 2736 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,043 psi | 89% | 2776 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,710 psi | 89% | 2726 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 45,919 psi | 72% | 2749 fps | 98.2% |
| Hodgdon Superformance | <<locked>> | 88% | 54,244 psi | 85% | 2782 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,579 psi | 57% | 1703 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,363 psi | 90% | 2703 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,318 psi | 88% | 2690 fps | 99.7% |
| IMR 4350 | <<locked>> | 92% | 56,695 psi | 89% | 2733 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,101 psi | 89% | 2726 fps | 99.7% |
| IMR 4831 | <<locked>> | 92% | 56,014 psi | 88% | 2740 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 56,985 psi | 89% | 2743 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,840 psi | 88% | 2726 fps | 97.6% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,347 psi | 87% | 2818 fps | 98.1% |
| Lovex S062 | <<locked>> | 84% | 57,508 psi | 90% | 2694 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 57,276 psi | 90% | 2720 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 55,376 psi | 87% | 2717 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 47,776 psi | 75% | 2618 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 54,882 psi | 86% | 2703 fps | 100% |
| Norma 204 | <<locked>> | 92% | 57,711 psi | 90% | 2785 fps | 99% |
| Norma MRP | <<locked>> | 98% | 57,043 psi | 89% | 2864 fps | 99.9% |
| Norma URP | <<locked>> | 90% | 54,288 psi | 85% | 2733 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 55,593 psi | 87% | 2726 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 55,985 psi | 88% | 2838 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 92% | 56,753 psi | 89% | 2785 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,183 psi | 79% | 2717 fps | 98.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,362 psi | 59% | 1742 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,434 psi | 88% | 2713 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,290 psi | 90% | 2812 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 55,579 psi | 87% | 2769 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 53,882 psi | 84% | 2795 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,209 psi | 72% | 2746 fps | 99.1% |
| Rottweil R 902 | <<locked>> | 82% | 56,130 psi | 88% | 2661 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 56,449 psi | 88% | 2707 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,578 psi | 86% | 2713 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 96% | 55,187 psi | 86% | 2769 fps | 99% |
| Rottweil R 907 | <<locked>> | 88% | 55,521 psi | 87% | 2700 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 57,276 psi | 90% | 2720 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 57,508 psi | 90% | 2694 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 55,376 psi | 87% | 2717 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,317 psi | 85% | 2713 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,000 psi | 89% | 2592 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 57,043 psi | 89% | 2677 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 54,723 psi | 86% | 2762 fps | 98.9% |
| Somchem S355 | <<locked>> | 86% | 56,260 psi | 88% | 2703 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,391 psi | 88% | 2707 fps | 97.4% |
| Somchem S365 | <<locked>> | 94% | 57,624 psi | 90% | 2782 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 55,840 psi | 88% | 2743 fps | 99.5% |
| Vihtavuori N135 | <<locked>> | 82% | 56,565 psi | 89% | 2618 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 56,623 psi | 89% | 2631 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 57,624 psi | 90% | 2674 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,260 psi | 88% | 2726 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,332 psi | 87% | 2723 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 54,839 psi | 86% | 2631 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 55,477 psi | 87% | 2733 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 56,666 psi | 89% | 2792 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,130 psi | 90% | 2858 fps | 98% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 48,979 psi | 77% | 2717 fps | 96.6% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,014 psi | 88% | 2690 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,114 psi | 85% | 2746 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 49,879 psi | 78% | 2835 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,173 psi | 88% | 2740 fps | 98.9% |
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 2495 | <<locked>> | 80% | 54,143 psi | 85% | 2589 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 51,416 psi | 81% | 2605 fps | 98.8% |
| Accurate 3100 | <<locked>> | 82% | 31,183 psi | 49% | 2293 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 51,314 psi | 80% | 2598 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 39,523 psi | 62% | 2490 fps | 99.2% |
| Accurate High Country | 78.5 gr | 88% | 41,539 psi | 65% | 2612 fps | 95% |
| Accurate MAGPRO | <<locked>> | 94% | 48,530 psi | 76% | 2723 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 48,138 psi | 75% | 2582 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 40,683 psi | 64% | 2523 fps | 95.6% |
| ADI AR 2213 | <<locked>> | 92% | 44,353 psi | 70% | 2618 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 98% | 35,070 psi | 55% | 2467 fps | 95.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,693 psi | 84% | 2785 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 40,886 psi | 64% | 2526 fps | 95.8% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 40,886 psi | 64% | 2526 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 48,689 psi | 76% | 2598 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,112 psi | 82% | 2667 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 38,203 psi | 60% | 2500 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 43,511 psi | 68% | 2612 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 40,466 psi | 63% | 2520 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 88% | 38,159 psi | 60% | 2510 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 28,123 psi | 44% | 2274 fps | 97.7% |
| Alliant Reloder-25 | <<locked>> | 86% | 29,979 psi | 47% | 2333 fps | 95.1% |
| Alliant Reloder-26 | 73.5 gr | 80% | 30,168 psi | 47% | 2379 fps | 96.3% |
| Bofors RP15 | <<locked>> | 92% | 40,408 psi | 63% | 2556 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 49,298 psi | 77% | 2615 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 38,159 psi | 60% | 2510 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 43,178 psi | 68% | 2500 fps | 97.4% |
| Hodgdon H1000 | <<locked>> | 98% | 43,526 psi | 68% | 2595 fps | 96% |
| Hodgdon H380 | <<locked>> | 80% | 49,487 psi | 78% | 2625 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 41,249 psi | 65% | 2530 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 80% | 44,150 psi | 69% | 2549 fps | 97% |
| Hodgdon H4831 | <<locked>> | 92% | 47,456 psi | 74% | 2625 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 46,528 psi | 73% | 2608 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,708 psi | 56% | 2395 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 94% | 37,840 psi | 59% | 2569 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 40,335 psi | 63% | 2546 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,282 psi | 43% | 1522 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 50,662 psi | 79% | 2612 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 52,736 psi | 83% | 2638 fps | 99.4% |
| IMR 4350 | <<locked>> | 80% | 38,798 psi | 61% | 2431 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 44,483 psi | 70% | 2526 fps | 98.1% |
| IMR 4831 | <<locked>> | 80% | 37,811 psi | 59% | 2444 fps | 98.9% |
| IMR 4895 | <<locked>> | 80% | 53,476 psi | 84% | 2694 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 46,238 psi | 72% | 2572 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 94% | 45,281 psi | 71% | 2648 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 50,894 psi | 80% | 2605 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 42,148 psi | 66% | 2480 fps | 98.7% |
| Lovex S070 | <<locked>> | 80% | 40,350 psi | 63% | 2464 fps | 97.5% |
| Lovex S071 | <<locked>> | 88% | 32,474 psi | 51% | 2326 fps | 95.8% |
| Norma 203B | <<locked>> | 80% | 51,474 psi | 81% | 2654 fps | 100% |
| Norma 204 | <<locked>> | 82% | 41,089 psi | 64% | 2513 fps | 95.6% |
| Norma MRP | 74.9 gr | 84% | 34,882 psi | 55% | 2464 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 39,044 psi | 61% | 2484 fps | 99% |
| Ramshot Big Game | <<locked>> | 80% | 51,953 psi | 81% | 2674 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 41,959 psi | 66% | 2595 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 37,942 psi | 59% | 2470 fps | 97.5% |
| Ramshot Magnum | <<locked>> | 92% | 37,434 psi | 59% | 2484 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,891 psi | 44% | 1558 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 49,458 psi | 78% | 2612 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,195 psi | 72% | 2661 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 39,218 psi | 61% | 2507 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 37,884 psi | 59% | 2513 fps | 98.6% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 34,766 psi | 54% | 2487 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 52,663 psi | 83% | 2615 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 46,383 psi | 73% | 2566 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 44,933 psi | 70% | 2556 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 86% | 39,494 psi | 62% | 2500 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 43,178 psi | 68% | 2500 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 42,148 psi | 66% | 2480 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 50,894 psi | 80% | 2605 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 40,350 psi | 63% | 2464 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 47,630 psi | 75% | 2615 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 47,297 psi | 74% | 2467 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 41,220 psi | 65% | 2428 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 39,131 psi | 61% | 2497 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 46,630 psi | 73% | 2562 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 46,108 psi | 72% | 2546 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 35,621 psi | 56% | 2444 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 35,186 psi | 55% | 2382 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 52,997 psi | 83% | 2575 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,127 psi | 83% | 2589 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 44,512 psi | 70% | 2493 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 40,538 psi | 64% | 2480 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 37,086 psi | 58% | 2415 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 51,358 psi | 80% | 2585 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 39,871 psi | 62% | 2480 fps | 99% |
| Vihtavuori N555 | <<locked>> | 80% | 31,140 psi | 49% | 2343 fps | 97.6% |
| Vihtavuori N560 | <<locked>> | 92% | 46,354 psi | 73% | 2684 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 98% | 45,643 psi | 72% | 2657 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 39,639 psi | 62% | 2451 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 41,423 psi | 65% | 2533 fps | 97.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,889 psi | 39% | 2251 fps | 96.8% |
| Winchester Supreme 780 | <<locked>> | 88% | 39,494 psi | 62% | 2470 fps | 95.4% |
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 93 powders for .338 Rem. Ultra Mag. loaded with the .338 | 224gr | TWENTY-NINE ERTP. Norma MRP delivers the highest muzzle velocity at 2,864 fps; across all powders the maximum-charge window runs from 1,703 fps to 2,864 fps. Accurate 3100 gives the best case fill at 100 %, and 93 of the 93 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 224.0 gr projectile in 0.338" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2225, Alliant Reloder-22 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. Alliant Reloder-26, Accurate High Country, Norma MRP rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 224gr | TWENTY-NINE ERTP 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.