Load Specifications
Bullet Manufacturer:Fox Bullets
Bullet Weight:185 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:1:13.5
Load data in caliber .338 Rem. Ultra Mag. with .338 | 185gr | Fox Classic Hunter bullet and 103 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 70, Alliant Reloder-17 and ReloadSwiss RS 60.
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 2495 | <<locked>> | 84% | 54,520 psi | 85% | 2854 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 56,884 psi | 89% | 2920 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,212 psi | 79% | 2884 fps | 98.8% |
| Accurate 4064 | <<locked>> | 86% | 55,071 psi | 86% | 2910 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,333 psi | 88% | 3009 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 54,650 psi | 86% | 2943 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,898 psi | 88% | 2946 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,143 psi | 85% | 2992 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,913 psi | 89% | 2943 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 55,259 psi | 87% | 3068 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 57,740 psi | 90% | 3045 fps | 98% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 57,740 psi | 90% | 3045 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,579 psi | 89% | 2966 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 56,898 psi | 89% | 2989 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 57,188 psi | 90% | 3068 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 54,839 psi | 86% | 3041 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 56,869 psi | 89% | 3031 fps | 97.8% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,299 psi | 79% | 2966 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,369 psi | 74% | 2913 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,379 psi | 65% | 2818 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,882 psi | 86% | 3104 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,810 psi | 86% | 2956 fps | 99.9% |
| Bofors RP3 | <<locked>> | 88% | 57,363 psi | 90% | 2979 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,299 psi | 79% | 2966 fps | 96.8% |
| Bofors RP7 | <<locked>> | 92% | 56,913 psi | 89% | 2959 fps | 98.5% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,058 psi | 89% | 2969 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 54,201 psi | 85% | 2943 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 55,056 psi | 86% | 3002 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 90% | 54,911 psi | 86% | 2963 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 82% | 55,288 psi | 87% | 2953 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 57,522 psi | 90% | 2986 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,521 psi | 87% | 2986 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 55,579 psi | 87% | 3038 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,940 psi | 56% | 1877 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,405 psi | 88% | 2953 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,709 psi | 87% | 2933 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,332 psi | 87% | 2930 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,708 psi | 86% | 2907 fps | 98.6% |
| IMR 4350 | <<locked>> | 94% | 54,462 psi | 85% | 2936 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,317 psi | 87% | 2940 fps | 98.6% |
| IMR 4831 | <<locked>> | 96% | 56,768 psi | 89% | 2999 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 54,708 psi | 86% | 2966 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 57,392 psi | 90% | 2976 fps | 96.2% |
| IMR 8208 XBR | <<locked>> | 82% | 56,913 psi | 89% | 2943 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,795 psi | 86% | 2910 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,058 psi | 89% | 2920 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,390 psi | 87% | 2923 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,143 psi | 86% | 2933 fps | 99.5% |
| Lovex S070 | <<locked>> | 94% | 56,289 psi | 88% | 2969 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,481 psi | 65% | 2730 fps | 97% |
| Norma 201 | <<locked>> | 84% | 56,623 psi | 89% | 2936 fps | 100% |
| Norma 202 | <<locked>> | 84% | 57,479 psi | 90% | 2933 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,159 psi | 88% | 2976 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,288 psi | 87% | 2986 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 53,519 psi | 84% | 3054 fps | 98.7% |
| Norma URP | <<locked>> | 94% | 54,998 psi | 86% | 2992 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 86% | 57,246 psi | 90% | 3002 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,012 psi | 85% | 2989 fps | 99.2% |
| Ramshot TAC | <<locked>> | 82% | 57,188 psi | 90% | 2959 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 57,290 psi | 90% | 2979 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,521 psi | 57% | 1919 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,462 psi | 85% | 2927 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,070 psi | 85% | 3002 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,259 psi | 85% | 3035 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 56,405 psi | 88% | 3028 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,274 psi | 87% | 3058 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 82% | 57,174 psi | 90% | 2913 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 57,319 psi | 90% | 2936 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 57,435 psi | 90% | 2976 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,811 psi | 87% | 2959 fps | 96.4% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,130 psi | 88% | 3018 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 92% | 56,913 psi | 89% | 2959 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,143 psi | 86% | 2933 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,795 psi | 86% | 2910 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,390 psi | 87% | 2923 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,289 psi | 88% | 2969 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,579 psi | 87% | 2982 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,869 psi | 88% | 2940 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 56,753 psi | 89% | 2963 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,273 psi | 85% | 2822 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,274 psi | 87% | 2822 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,926 psi | 86% | 2881 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,622 psi | 87% | 3015 fps | 97.8% |
| Somchem S335 | <<locked>> | 84% | 57,261 psi | 90% | 2861 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,738 psi | 87% | 2927 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 57,377 psi | 90% | 2972 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 54,157 psi | 85% | 2995 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 56,681 psi | 89% | 2989 fps | 98.6% |
| Vihtavuori N133 | <<locked>> | 82% | 54,810 psi | 86% | 2805 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 57,696 psi | 90% | 2897 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,549 psi | 85% | 2861 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,361 psi | 87% | 2897 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 57,508 psi | 90% | 2989 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,791 psi | 76% | 2848 fps | 96.8% |
| Vihtavuori N530 | <<locked>> | 82% | 57,508 psi | 90% | 2940 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 56,405 psi | 88% | 2904 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 56,507 psi | 89% | 2992 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,939 psi | 83% | 2989 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 57,682 psi | 90% | 2956 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,245 psi | 87% | 3009 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,772 psi | 67% | 2953 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,101 psi | 89% | 2972 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,447 psi | 84% | 2930 fps | 97.1% |
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% | 47,645 psi | 75% | 2759 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,470 psi | 73% | 2749 fps | 96.3% |
| Accurate 3100 | <<locked>> | 92% | 37,826 psi | 59% | 2654 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 45,107 psi | 71% | 2759 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,997 psi | 53% | 2592 fps | 96.2% |
| ADI AR 2206H | <<locked>> | 80% | 51,227 psi | 80% | 2887 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,468 psi | 68% | 2736 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 47,282 psi | 74% | 2871 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,345 psi | 84% | 2890 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,776 psi | 75% | 2943 fps | 99.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 47,326 psi | 74% | 2871 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 47,326 psi | 74% | 2871 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,526 psi | 68% | 2756 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,702 psi | 73% | 2828 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,692 psi | 53% | 2612 fps | 96.3% |
| Alliant Reloder-17 | 75.4 gr | 80% | 38,218 psi | 60% | 2743 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 46,731 psi | 73% | 2861 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 46,963 psi | 74% | 2907 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 84% | 27,717 psi | 43% | 2454 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,230 psi | 57% | 2694 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 88% | 34,693 psi | 54% | 2703 fps | 96.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,039 psi | 80% | 2897 fps | 99.7% |
| Bofors RP3 | <<locked>> | 80% | 43,656 psi | 68% | 2766 fps | 99.9% |
| Bofors RP5 | <<locked>> | 98% | 46,963 psi | 74% | 2907 fps | 95.9% |
| Bofors RP7 | <<locked>> | 82% | 41,205 psi | 65% | 2680 fps | 95% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,243 psi | 83% | 2913 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,150 psi | 69% | 2769 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 82% | 38,957 psi | 61% | 2707 fps | 95% |
| Hodgdon H4350 | <<locked>> | 84% | 45,107 psi | 71% | 2792 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 51,764 psi | 81% | 2900 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,038 psi | 49% | 2500 fps | 97% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,385 psi | 76% | 2874 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 41,249 psi | 65% | 2776 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,672 psi | 42% | 1680 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,487 psi | 78% | 2848 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,170 psi | 82% | 2884 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,658 psi | 72% | 2772 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,109 psi | 75% | 2799 fps | 97.4% |
| IMR 4350 | <<locked>> | 86% | 41,930 psi | 66% | 2713 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,161 psi | 63% | 2661 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 32,866 psi | 52% | 2549 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 47,921 psi | 75% | 2858 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 98% | 53,795 psi | 84% | 2917 fps | 95.3% |
| IMR 8208 XBR | <<locked>> | 80% | 53,345 psi | 84% | 2890 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 51,198 psi | 80% | 2861 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,343 psi | 79% | 2815 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,600 psi | 71% | 2769 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,478 psi | 59% | 2605 fps | 95.9% |
| Lovex S070 | <<locked>> | 84% | 40,654 psi | 64% | 2690 fps | 95.8% |
| Lovex S071 | <<locked>> | 96% | 36,187 psi | 57% | 2618 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 49,792 psi | 78% | 2831 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,546 psi | 79% | 2835 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,079 psi | 72% | 2812 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 48,080 psi | 75% | 2864 fps | 95.7% |
| Norma MRP | <<locked>> | 92% | 40,103 psi | 63% | 2795 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 34,171 psi | 54% | 2595 fps | 96.1% |
| Ramshot Big Game | <<locked>> | 80% | 46,398 psi | 73% | 2831 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 38,174 psi | 60% | 2694 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 53,505 psi | 84% | 2907 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 53,505 psi | 84% | 2923 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,108 psi | 42% | 1719 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,512 psi | 70% | 2753 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,285 psi | 79% | 2943 fps | 99.8% |
| ReloadSwiss RS 60 | 75.4 gr | 80% | 40,683 psi | 64% | 2805 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,881 psi | 53% | 2605 fps | 95.7% |
| ReloadSwiss RS 70 | 78.5 gr | 82% | 35,882 psi | 56% | 2677 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 53,780 psi | 84% | 2867 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 47,384 psi | 74% | 2782 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,930 psi | 64% | 2707 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 52,199 psi | 82% | 2904 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 94% | 45,527 psi | 71% | 2838 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 82% | 41,205 psi | 65% | 2680 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,478 psi | 59% | 2605 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,198 psi | 80% | 2861 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,600 psi | 71% | 2769 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 40,654 psi | 64% | 2690 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,250 psi | 66% | 2759 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,098 psi | 82% | 2881 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,719 psi | 78% | 2854 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,937 psi | 80% | 2776 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,815 psi | 67% | 2638 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,276 psi | 62% | 2602 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,107 psi | 71% | 2835 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 50,575 psi | 79% | 2769 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,880 psi | 81% | 2871 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,437 psi | 65% | 2710 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 30,632 psi | 48% | 2546 fps | 98.2% |
| Somchem S385 | <<locked>> | 92% | 43,236 psi | 68% | 2762 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 51,474 psi | 81% | 2762 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,514 psi | 74% | 2756 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,979 psi | 75% | 2766 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,610 psi | 62% | 2641 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,592 psi | 56% | 2598 fps | 96.6% |
| Vihtavuori N165 | <<locked>> | 96% | 42,496 psi | 67% | 2733 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 53,766 psi | 84% | 2887 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 46,267 psi | 73% | 2756 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,041 psi | 55% | 2595 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 84% | 30,385 psi | 48% | 2533 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,056 psi | 55% | 2569 fps | 98.6% |
| Winchester 760 | <<locked>> | 82% | 39,117 psi | 61% | 2710 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 88% | 27,992 psi | 44% | 2539 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,719 psi | 78% | 2861 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,108 psi | 72% | 2805 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 103 powders for .338 Rem. Ultra Mag. loaded with the .338 | 185gr | Fox Classic Hunter. Alliant Reloder-26 delivers the highest muzzle velocity at 3,104 fps; across all powders the maximum-charge window runs from 1,877 fps to 3,104 fps. Accurate 3100 gives the best case fill at 100 %, and 103 of the 103 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 185.0 gr projectile in 0.338" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Power Pro Varmint, Alliant Power Pro Varmint 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. ReloadSwiss RS 70, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 185gr | Fox Classic Hunter 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.