Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 160gr | TWENTY-NINE ERTP bullet and 95 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.
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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 2015 | <<locked>> | 82% | 55,724 psi | 87% | 3028 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,550 psi | 87% | 3051 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 56,898 psi | 89% | 3117 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 57,740 psi | 90% | 3097 fps | 97.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,920 psi | 74% | 2986 fps | 97% |
| Accurate 4064 | <<locked>> | 88% | 55,782 psi | 87% | 3104 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 56,550 psi | 89% | 3189 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 84% | 55,361 psi | 87% | 3133 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 90% | 56,434 psi | 88% | 3130 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 57,653 psi | 90% | 3133 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 55,216 psi | 87% | 3061 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 55,477 psi | 87% | 3251 fps | 99.8% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 54,085 psi | 85% | 3150 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 56,927 psi | 89% | 3156 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 57,290 psi | 90% | 3176 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 57,203 psi | 90% | 3248 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,853 psi | 86% | 3222 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 44,092 psi | 69% | 3015 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 50,662 psi | 79% | 3202 fps | 99.2% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 55,347 psi | 87% | 3140 fps | 99.6% |
| Bofors RP3 | <<locked>> | 88% | 54,215 psi | 85% | 3114 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 57,508 psi | 90% | 3136 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,492 psi | 87% | 3064 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,853 psi | 84% | 3104 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,984 psi | 86% | 3127 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 94% | 55,288 psi | 87% | 3176 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 92% | 55,317 psi | 87% | 3136 fps | 96.4% |
| Hodgdon H4895 | <<locked>> | 84% | 55,941 psi | 88% | 3146 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 57,276 psi | 90% | 3163 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 55,941 psi | 88% | 3173 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 56,057 psi | 88% | 3212 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,650 psi | 56% | 2008 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 57,029 psi | 89% | 3143 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 56,086 psi | 88% | 3130 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 55,970 psi | 88% | 3114 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 55,608 psi | 87% | 3091 fps | 97.7% |
| IMR 4350 | <<locked>> | 96% | 54,795 psi | 86% | 3104 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 55,854 psi | 88% | 3117 fps | 97.7% |
| IMR 4831 | <<locked>> | 98% | 56,869 psi | 89% | 3173 fps | 99.7% |
| IMR 4895 | <<locked>> | 86% | 55,201 psi | 87% | 3156 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 84% | 57,653 psi | 90% | 3133 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,492 psi | 87% | 3104 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 57,740 psi | 90% | 3107 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,840 psi | 88% | 3110 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 55,666 psi | 87% | 3107 fps | 98.8% |
| Lovex S070 | <<locked>> | 96% | 56,797 psi | 89% | 3143 fps | 98.1% |
| Norma 201 | <<locked>> | 86% | 57,537 psi | 90% | 3130 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,592 psi | 86% | 3077 fps | 100% |
| Norma 203B | <<locked>> | 88% | 56,536 psi | 89% | 3163 fps | 100% |
| Norma 204 | <<locked>> | 96% | 55,564 psi | 87% | 3153 fps | 96% |
| Norma MRPᴾ | <<locked>> | 100% | 49,893 psi | 78% | 3150 fps | 96.7% |
| Norma URP | <<locked>> | 96% | 55,129 psi | 86% | 3169 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 88% | 57,667 psi | 90% | 3186 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 54,056 psi | 85% | 3159 fps | 98.4% |
| Ramshot TAC | <<locked>> | 82% | 54,404 psi | 85% | 3087 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,288 psi | 85% | 3110 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,158 psi | 57% | 2054 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 55,158 psi | 86% | 3104 fps | 98.2% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,389 psi | 85% | 3189 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,433 psi | 85% | 3222 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 56,492 psi | 89% | 3205 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 55,477 psi | 87% | 3232 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 82% | 54,781 psi | 86% | 3064 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,679 psi | 86% | 3077 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,201 psi | 85% | 3110 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 57,508 psi | 90% | 3136 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 94% | 55,666 psi | 87% | 3107 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,492 psi | 87% | 3104 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,840 psi | 88% | 3110 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 56,797 psi | 89% | 3143 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 56,115 psi | 88% | 3169 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,898 psi | 89% | 3127 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 57,537 psi | 90% | 3153 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,100 psi | 86% | 3015 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,883 psi | 88% | 3009 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 55,738 psi | 87% | 3054 fps | 97.7% |
| Somchem S335 | <<locked>> | 84% | 54,737 psi | 86% | 3009 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 56,391 psi | 88% | 3114 fps | 99.9% |
| Somchem S355 | <<locked>> | 90% | 54,360 psi | 85% | 3107 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 57,624 psi | 90% | 3225 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 53,127 psi | 83% | 3097 fps | 96.8% |
| Vihtavuori N133 | <<locked>> | 84% | 55,448 psi | 87% | 2999 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 54,462 psi | 85% | 3038 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 55,172 psi | 86% | 3051 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 55,883 psi | 88% | 3081 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 57,711 psi | 90% | 3169 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 82% | 54,418 psi | 85% | 3077 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 57,203 psi | 90% | 3097 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 56,826 psi | 89% | 3169 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 49,153 psi | 77% | 3100 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 54,172 psi | 85% | 3077 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 54,795 psi | 86% | 3127 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,506 psi | 87% | 3179 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,885 psi | 63% | 3031 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 86% | 57,696 psi | 90% | 3159 fps | 100% |
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 2015 | <<locked>> | 80% | 52,431 psi | 82% | 2982 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 45,440 psi | 71% | 2900 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 53,127 psi | 83% | 3061 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 50,531 psi | 79% | 2979 fps | 95.8% |
| Accurate 3100 | <<locked>> | 96% | 40,785 psi | 64% | 2864 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 42,960 psi | 67% | 2894 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 36,898 psi | 58% | 2815 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 48,588 psi | 76% | 3018 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 41,133 psi | 64% | 2851 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,676 psi | 79% | 3025 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,576 psi | 81% | 3009 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,817 psi | 70% | 3051 fps | 98.4% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 50,720 psi | 79% | 3087 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,205 psi | 65% | 2877 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,208 psi | 69% | 2946 fps | 98.4% |
| Alliant Reloder-16 | <<locked>> | 84% | 36,274 psi | 57% | 2825 fps | 95.6% |
| Alliant Reloder-17 | 77 gr | 80% | 35,926 psi | 56% | 2841 fps | 97.3% |
| Alliant Reloder-23 | <<locked>> | 90% | 31,981 psi | 50% | 2720 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 92% | 37,550 psi | 59% | 2913 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,312 psi | 76% | 3018 fps | 98.7% |
| Bofors RP3 | <<locked>> | 80% | 41,249 psi | 65% | 2881 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 47,514 psi | 74% | 2963 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,141 psi | 82% | 3012 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,328 psi | 79% | 3048 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 41,887 psi | 66% | 2884 fps | 96.7% |
| Hodgdon H414 | <<locked>> | 88% | 44,962 psi | 70% | 2989 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 90% | 51,924 psi | 81% | 3077 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 49,081 psi | 77% | 3031 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 31,415 psi | 49% | 2657 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,513 psi | 71% | 2995 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 90% | 48,240 psi | 76% | 3071 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,498 psi | 42% | 1801 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,891 psi | 73% | 2976 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 49,008 psi | 77% | 3025 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 43,221 psi | 68% | 2890 fps | 98.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,759 psi | 72% | 2910 fps | 95.4% |
| IMR 4350 | <<locked>> | 92% | 48,109 psi | 75% | 2989 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 46,137 psi | 72% | 2940 fps | 95.4% |
| IMR 4831 | <<locked>> | 84% | 35,578 psi | 56% | 2766 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 45,310 psi | 71% | 2979 fps | 99% |
| IMR 8208 XBR | <<locked>> | 80% | 50,676 psi | 79% | 3025 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,312 psi | 76% | 2992 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,037 psi | 75% | 2949 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 43,352 psi | 68% | 2894 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 40,582 psi | 64% | 2828 fps | 95.4% |
| Lovex S070 | <<locked>> | 88% | 43,903 psi | 69% | 2910 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 47,514 psi | 74% | 2966 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 48,008 psi | 75% | 2976 fps | 100% |
| Norma 203B | <<locked>> | 80% | 43,569 psi | 68% | 2933 fps | 98.7% |
| Norma 204 | <<locked>> | 94% | 51,793 psi | 81% | 3091 fps | 95.1% |
| Norma MRP | <<locked>> | 98% | 46,441 psi | 73% | 3084 fps | 95.7% |
| Norma URP | <<locked>> | 84% | 36,796 psi | 58% | 2812 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 43,627 psi | 68% | 2946 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 88% | 41,278 psi | 65% | 2917 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 50,792 psi | 80% | 3028 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,589 psi | 79% | 3051 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,905 psi | 42% | 1847 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,105 psi | 66% | 2861 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,181 psi | 74% | 3061 fps | 98.8% |
| ReloadSwiss RS 60 | 77 gr | 80% | 38,247 psi | 60% | 2917 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 36,593 psi | 57% | 2825 fps | 95.2% |
| ReloadSwiss RS 70 | 84 gr | 86% | 38,914 psi | 61% | 2894 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 51,416 psi | 81% | 3012 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 45,237 psi | 71% | 2913 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 38,725 psi | 61% | 2822 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 88% | 47,514 psi | 74% | 2963 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 84% | 40,582 psi | 64% | 2828 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,312 psi | 76% | 2992 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 43,352 psi | 68% | 2894 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 88% | 43,903 psi | 69% | 2910 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,813 psi | 62% | 2871 fps | 97.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,327 psi | 77% | 3002 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,152 psi | 74% | 2979 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,515 psi | 76% | 2917 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,640 psi | 64% | 2766 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 45,701 psi | 72% | 2881 fps | 95.5% |
| Somchem S335 | <<locked>> | 80% | 48,341 psi | 76% | 2910 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,168 psi | 77% | 2999 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 39,334 psi | 62% | 2825 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 28,848 psi | 45% | 2638 fps | 95.9% |
| Somchem S385 | <<locked>> | 96% | 46,412 psi | 73% | 2976 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 48,907 psi | 77% | 2907 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,875 psi | 70% | 2894 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,484 psi | 71% | 2900 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 37,507 psi | 59% | 2756 fps | 98.9% |
| Vihtavuori N160 | <<locked>> | 82% | 35,839 psi | 56% | 2756 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 50,995 psi | 80% | 3022 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,034 psi | 69% | 2887 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 37,927 psi | 59% | 2815 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 90% | 34,896 psi | 55% | 2802 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,359 psi | 52% | 2667 fps | 96.7% |
| Winchester 748 | <<locked>> | 80% | 51,169 psi | 80% | 3068 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 45,121 psi | 71% | 2992 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 92% | 30,342 psi | 48% | 2740 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 46,978 psi | 74% | 2986 fps | 99.5% |
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 95 powders for .338 Rem. Ultra Mag. loaded with the .338 | 160gr | TWENTY-NINE ERTP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 3,251 fps; across all powders the maximum-charge window runs from 2,008 fps to 3,251 fps. Accurate 3100 gives the best case fill at 100 %, and 95 of the 95 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 160.0 gr projectile in 0.338" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Power Pro Varmint, Alliant Reloder-23 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 | 160gr | 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.