Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 180gr | Impala LW CFN bullet and 84 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Alliant Reloder-16.
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% | 55,506 psi | 87% | 2917 fps | 98.1% |
| Accurate 3100 | <<locked>> | 98% | 55,332 psi | 87% | 2976 fps | 99.3% |
| Accurate 4064 | <<locked>> | 82% | 56,840 psi | 89% | 2940 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 56,782 psi | 89% | 3031 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 54,737 psi | 86% | 2946 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 56,521 psi | 89% | 3051 fps | 97.6% |
| ADI AR 2213 | <<locked>> | 98% | 54,578 psi | 86% | 3041 fps | 95.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 57,508 psi | 90% | 3123 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 56,028 psi | 88% | 2976 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 56,043 psi | 88% | 2995 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 56,260 psi | 88% | 3074 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 53,925 psi | 85% | 3045 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 56,086 psi | 88% | 3038 fps | 97.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 57,406 psi | 90% | 3100 fps | 98.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,433 psi | 85% | 3041 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,761 psi | 75% | 2963 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 96% | 54,824 psi | 86% | 3123 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 52,823 psi | 83% | 3025 fps | 97.1% |
| Bofors RP3 | <<locked>> | 84% | 57,450 psi | 90% | 2999 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 57,406 psi | 90% | 3100 fps | 98.1% |
| Bofors RP7 | <<locked>> | 88% | 56,289 psi | 88% | 2969 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 84% | 57,464 psi | 90% | 3009 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 88% | 54,447 psi | 85% | 3012 fps | 98.7% |
| Hodgdon H4350 | <<locked>> | 88% | 57,363 psi | 90% | 3022 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 98% | 57,188 psi | 90% | 3025 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 56,942 psi | 89% | 2999 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,746 psi | 73% | 2989 fps | 96.3% |
| Hodgdon Superformance | <<locked>> | 88% | 54,418 psi | 85% | 3038 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,869 psi | 58% | 1919 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 57,624 psi | 90% | 2982 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 56,608 psi | 89% | 2959 fps | 98.8% |
| IMR 4350 | <<locked>> | 92% | 56,855 psi | 89% | 2992 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 57,261 psi | 90% | 2989 fps | 98.9% |
| IMR 4831 | <<locked>> | 92% | 56,681 psi | 89% | 3012 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 57,493 psi | 90% | 3025 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 55,985 psi | 88% | 2972 fps | 95.8% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 55,535 psi | 87% | 3071 fps | 96.3% |
| Lovex S062 | <<locked>> | 82% | 55,027 psi | 86% | 2933 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 54,911 psi | 86% | 2946 fps | 99.4% |
| Lovex S070 | <<locked>> | 90% | 56,188 psi | 88% | 2986 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,559 psi | 78% | 2884 fps | 98.6% |
| Norma 203B | <<locked>> | 82% | 55,434 psi | 87% | 2982 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,273 psi | 85% | 2989 fps | 97.1% |
| Norma MRP | <<locked>> | 98% | 57,188 psi | 90% | 3130 fps | 99.1% |
| Norma URP | <<locked>> | 90% | 54,694 psi | 86% | 3005 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 82% | 55,970 psi | 88% | 3002 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 56,362 psi | 88% | 3087 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 92% | 57,000 psi | 89% | 3054 fps | 99.5% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,981 psi | 80% | 2966 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,608 psi | 59% | 1962 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 56,913 psi | 89% | 2982 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 57,000 psi | 89% | 3094 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 56,173 psi | 88% | 3045 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,157 psi | 85% | 3061 fps | 99.8% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 47,239 psi | 74% | 2986 fps | 97.6% |
| Rottweil R 902 | <<locked>> | 82% | 57,101 psi | 89% | 2946 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 57,667 psi | 90% | 2995 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 54,752 psi | 86% | 2966 fps | 96.1% |
| Rottweil R 905 | <<locked>> | 96% | 55,550 psi | 87% | 3028 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 88% | 56,289 psi | 88% | 2969 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,911 psi | 86% | 2946 fps | 99.4% |
| Shooters World Precision | <<locked>> | 82% | 55,027 psi | 86% | 2933 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 56,188 psi | 88% | 2986 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 54,708 psi | 86% | 2989 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 57,334 psi | 90% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,520 psi | 85% | 2890 fps | 98.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 55,056 psi | 86% | 3025 fps | 97.6% |
| Somchem S355 | <<locked>> | 86% | 57,159 psi | 90% | 2986 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 56,797 psi | 89% | 2953 fps | 95.7% |
| Somchem S365 | <<locked>> | 92% | 54,215 psi | 85% | 3012 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 56,753 psi | 89% | 3009 fps | 98.5% |
| Vihtavuori N135 | <<locked>> | 82% | 57,232 psi | 90% | 2904 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 57,174 psi | 90% | 2913 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 54,868 psi | 86% | 2907 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 56,579 psi | 89% | 2995 fps | 99.9% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 2972 fps | 98% |
| Vihtavuori N540 | <<locked>> | 82% | 55,608 psi | 87% | 2910 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 56,260 psi | 88% | 3005 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 98% | 57,609 psi | 90% | 3071 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 57,217 psi | 90% | 3114 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 56,144 psi | 88% | 2956 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,621 psi | 86% | 3015 fps | 98.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,125 psi | 79% | 3110 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 56,260 psi | 88% | 2992 fps | 97.6% |
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% | 52,257 psi | 82% | 2864 fps | 97.5% |
| Accurate 3100 | <<locked>> | 86% | 37,869 psi | 59% | 2657 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 53,403 psi | 84% | 2890 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,379 psi | 65% | 2759 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 48,646 psi | 76% | 2848 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 46,992 psi | 74% | 2881 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 96% | 51,213 psi | 80% | 2979 fps | 95% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 53,693 psi | 84% | 3061 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,763 psi | 78% | 2877 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 52,881 psi | 83% | 2946 fps | 99.9% |
| Alliant Reloder-16 | 72.3 gr | 80% | 39,044 psi | 61% | 2753 fps | 98.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,309 psi | 69% | 2881 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 90% | 46,630 psi | 73% | 2874 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 92% | 44,614 psi | 70% | 2874 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,907 psi | 47% | 2523 fps | 96.3% |
| Alliant Reloder-25 | <<locked>> | 90% | 35,578 psi | 56% | 2684 fps | 95.3% |
| Alliant Reloder-26 | 81.8 gr | 82% | 34,200 psi | 54% | 2694 fps | 95.7% |
| Bofors RP15 | <<locked>> | 96% | 46,702 psi | 73% | 2913 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 50,836 psi | 80% | 2897 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 44,614 psi | 70% | 2874 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 44,440 psi | 70% | 2756 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 50,720 psi | 79% | 2900 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 80% | 42,322 psi | 66% | 2785 fps | 96% |
| Hodgdon H4350 | <<locked>> | 80% | 44,889 psi | 70% | 2802 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 96% | 53,505 psi | 84% | 2966 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,883 psi | 58% | 2648 fps | 98.7% |
| Hodgdon Retumbo | <<locked>> | 98% | 44,121 psi | 69% | 2930 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 41,307 psi | 65% | 2789 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,644 psi | 43% | 1719 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 51,184 psi | 80% | 2881 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 53,229 psi | 83% | 2904 fps | 98.3% |
| IMR 4350 | <<locked>> | 82% | 42,221 psi | 66% | 2730 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,295 psi | 71% | 2779 fps | 96.6% |
| IMR 4831 | <<locked>> | 80% | 39,378 psi | 62% | 2703 fps | 97.9% |
| IMR 4895 | <<locked>> | 80% | 54,215 psi | 85% | 2976 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 52,866 psi | 83% | 2923 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 98% | 52,257 psi | 82% | 3012 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 51,895 psi | 81% | 2884 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,424 psi | 68% | 2740 fps | 97.6% |
| Lovex S070 | <<locked>> | 80% | 41,959 psi | 66% | 2723 fps | 96.1% |
| Lovex S071 | <<locked>> | 90% | 36,883 psi | 58% | 2635 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 52,315 psi | 82% | 2933 fps | 100% |
| Norma 204 | <<locked>> | 86% | 47,558 psi | 75% | 2871 fps | 95.5% |
| Norma MRP | 85.2 gr | 88% | 41,205 psi | 65% | 2831 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 40,350 psi | 63% | 2743 fps | 98% |
| Ramshot Big Game | <<locked>> | 80% | 52,431 psi | 82% | 2946 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 52,475 psi | 82% | 3022 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 39,088 psi | 61% | 2723 fps | 95.9% |
| Ramshot Magnum | <<locked>> | 96% | 44,527 psi | 70% | 2844 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,239 psi | 44% | 1762 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,241 psi | 79% | 2874 fps | 98.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 46,746 psi | 73% | 2933 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,596 psi | 64% | 2766 fps | 97.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,059 psi | 61% | 2762 fps | 97.1% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 41,452 psi | 65% | 2854 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 53,882 psi | 84% | 2900 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 47,993 psi | 75% | 2844 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 51,619 psi | 81% | 2913 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 90% | 46,050 psi | 72% | 2861 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 44,440 psi | 70% | 2756 fps | 95.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,424 psi | 68% | 2740 fps | 97.6% |
| Shooters World Precision | <<locked>> | 80% | 51,895 psi | 81% | 2884 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 41,959 psi | 66% | 2723 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,312 psi | 76% | 2884 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,066 psi | 75% | 2736 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,656 psi | 67% | 2680 fps | 96.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 45,629 psi | 72% | 2858 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 47,834 psi | 75% | 2838 fps | 99.9% |
| Somchem S361 | <<locked>> | 92% | 53,447 psi | 84% | 2900 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 36,999 psi | 58% | 2707 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 41,727 psi | 65% | 2740 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 53,867 psi | 84% | 2858 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 53,867 psi | 84% | 2871 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,745 psi | 72% | 2766 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,640 psi | 65% | 2736 fps | 98.2% |
| Vihtavuori N165 | <<locked>> | 92% | 43,366 psi | 68% | 2762 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 52,402 psi | 82% | 2864 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,365 psi | 65% | 2743 fps | 98% |
| Vihtavuori N555 | <<locked>> | 80% | 33,170 psi | 52% | 2608 fps | 96.5% |
| Vihtavuori N560 | <<locked>> | 96% | 53,693 psi | 84% | 3054 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,553 psi | 64% | 2700 fps | 99.6% |
| Winchester 760 | <<locked>> | 80% | 42,453 psi | 67% | 2789 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,064 psi | 42% | 2500 fps | 95.2% |
| Winchester Supreme 780 | <<locked>> | 92% | 46,209 psi | 72% | 2825 fps | 95.3% |
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 84 powders for .338 Rem. Ultra Mag. loaded with the .338 | 180gr | Impala LW CFN. Norma MRP delivers the highest muzzle velocity at 3,130 fps; across all powders the maximum-charge window runs from 1,919 fps to 3,130 fps. Alliant Reloder-22 gives the best case fill at 100 %, and 84 of the 84 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 180.0 gr projectile in 0.338" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-22, Alliant Reloder-23, 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. Alliant Reloder-26, Norma MRP, Alliant Reloder-16 rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 180gr | Impala LW CFN 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.