Load Specifications
Load data in caliber .338 Rem. Ultra Mag. with .338 | 180gr | Ferrobull Entox Sport bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-16 and ReloadSwiss RS 70.
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% | 55,172 psi | 86% | 2904 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 57,537 psi | 90% | 2969 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 51,126 psi | 80% | 2933 fps | 98.9% |
| Accurate 4064 | <<locked>> | 86% | 55,608 psi | 87% | 2956 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 56,956 psi | 89% | 3058 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 55,042 psi | 86% | 2989 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 56,550 psi | 89% | 2992 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,723 psi | 86% | 3038 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 82% | 57,334 psi | 90% | 2986 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,028 psi | 88% | 3117 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 57,217 psi | 90% | 3015 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 57,377 psi | 90% | 3038 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,259 psi | 85% | 3064 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,637 psi | 87% | 3091 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 53,940 psi | 85% | 3025 fps | 97.3% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 51,155 psi | 80% | 3018 fps | 96.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 48,095 psi | 75% | 2959 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,916 psi | 66% | 2861 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 55,796 psi | 87% | 3153 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,361 psi | 87% | 3002 fps | 99.9% |
| Bofors RP3 | <<locked>> | 86% | 54,273 psi | 85% | 2976 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 51,155 psi | 80% | 3018 fps | 96.9% |
| Bofors RP7 | <<locked>> | 92% | 57,551 psi | 90% | 3009 fps | 98.6% |
| Hodgdon BL-C2 | <<locked>> | 82% | 57,653 psi | 90% | 3015 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 54,955 psi | 86% | 2992 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 92% | 55,767 psi | 87% | 3054 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 90% | 55,506 psi | 87% | 3012 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 82% | 55,666 psi | 87% | 2999 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,447 psi | 85% | 2986 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 56,318 psi | 88% | 3035 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 56,478 psi | 89% | 3091 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,969 psi | 56% | 1913 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,942 psi | 89% | 3002 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 56,289 psi | 88% | 2982 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,869 psi | 88% | 2979 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,347 psi | 87% | 2956 fps | 98.6% |
| IMR 4350 | <<locked>> | 94% | 55,158 psi | 86% | 2986 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,738 psi | 87% | 2986 fps | 98.7% |
| IMR 4831 | <<locked>> | 96% | 57,522 psi | 90% | 3048 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,245 psi | 87% | 3015 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 57,334 psi | 90% | 2986 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 55,521 psi | 87% | 2959 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 57,580 psi | 90% | 2969 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,912 psi | 88% | 2969 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,579 psi | 87% | 2979 fps | 99.5% |
| Lovex S070 | <<locked>> | 94% | 57,029 psi | 89% | 3018 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,119 psi | 66% | 2772 fps | 97% |
| Norma 201 | <<locked>> | 84% | 57,232 psi | 90% | 2986 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,447 psi | 85% | 2930 fps | 100% |
| Norma 203B | <<locked>> | 86% | 56,637 psi | 89% | 3025 fps | 100% |
| Norma 204 | <<locked>> | 94% | 56,101 psi | 88% | 3038 fps | 97.4% |
| Norma MRPᴾ | <<locked>> | 100% | 54,534 psi | 85% | 3104 fps | 98.8% |
| Norma URP | <<locked>> | 94% | 55,782 psi | 87% | 3045 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 84% | 54,099 psi | 85% | 2992 fps | 100% |
| Ramshot Hunter | <<locked>> | 94% | 54,824 psi | 86% | 3038 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,521 psi | 57% | 1955 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,897 psi | 86% | 2972 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,650 psi | 86% | 3051 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 55,114 psi | 86% | 3084 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 57,217 psi | 90% | 3077 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,999 psi | 88% | 3110 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 84% | 54,317 psi | 85% | 2933 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,288 psi | 85% | 2969 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 56,594 psi | 89% | 3012 fps | 96.5% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,855 psi | 89% | 3068 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 92% | 57,551 psi | 90% | 3009 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,579 psi | 87% | 2979 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 82% | 55,521 psi | 87% | 2959 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,912 psi | 88% | 2969 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 57,029 psi | 89% | 3018 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,246 psi | 88% | 3031 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 56,637 psi | 89% | 2992 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 57,334 psi | 90% | 3012 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,607 psi | 86% | 2871 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,796 psi | 87% | 2867 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,622 psi | 87% | 2930 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 56,347 psi | 88% | 3064 fps | 97.8% |
| Somchem S335 | <<locked>> | 82% | 54,360 psi | 85% | 2864 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 56,304 psi | 88% | 2976 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,360 psi | 85% | 2969 fps | 100% |
| Somchem S365 | <<locked>> | 96% | 54,911 psi | 86% | 3041 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 57,566 psi | 90% | 3041 fps | 98.6% |
| Vihtavuori N133 | <<locked>> | 82% | 55,187 psi | 86% | 2851 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 54,650 psi | 86% | 2897 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,100 psi | 86% | 2907 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,883 psi | 88% | 2943 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,389 psi | 85% | 2986 fps | 99.8% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 49,632 psi | 78% | 2897 fps | 96.9% |
| Vihtavuori N540 | <<locked>> | 86% | 57,145 psi | 90% | 2953 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 57,174 psi | 90% | 3041 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,780 psi | 84% | 3038 fps | 100% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 54,491 psi | 85% | 2953 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,956 psi | 88% | 3054 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 43,395 psi | 68% | 2999 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 57,638 psi | 90% | 3018 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 54,230 psi | 85% | 2979 fps | 97.2% |
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% | 48,196 psi | 76% | 2805 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,891 psi | 73% | 2795 fps | 96.3% |
| Accurate 3100 | <<locked>> | 92% | 38,377 psi | 60% | 2697 fps | 95.9% |
| Accurate 4064 | <<locked>> | 80% | 45,672 psi | 72% | 2805 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,403 psi | 54% | 2635 fps | 96.2% |
| ADI AR 2206H | <<locked>> | 80% | 51,663 psi | 81% | 2936 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,787 psi | 69% | 2779 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 94% | 47,877 psi | 75% | 2920 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 53,838 psi | 84% | 2936 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,254 psi | 76% | 2989 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,019 psi | 69% | 2805 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,123 psi | 74% | 2871 fps | 99.6% |
| Alliant Reloder-16 | 72.1 gr | 80% | 34,127 psi | 53% | 2654 fps | 96.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 38,638 psi | 61% | 2785 fps | 99.2% |
| Alliant Reloder-19 | <<locked>> | 94% | 47,181 psi | 74% | 2907 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 96% | 44,585 psi | 70% | 2894 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 84% | 28,108 psi | 44% | 2497 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 96% | 36,709 psi | 58% | 2740 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 88% | 35,230 psi | 55% | 2746 fps | 96.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,590 psi | 81% | 2943 fps | 99.8% |
| Bofors RP3 | <<locked>> | 80% | 44,106 psi | 69% | 2808 fps | 99.9% |
| Bofors RP5 | <<locked>> | 96% | 44,585 psi | 70% | 2894 fps | 95% |
| Bofors RP7 | <<locked>> | 82% | 41,568 psi | 65% | 2726 fps | 95% |
| Hodgdon BL-C2 | <<locked>> | 80% | 53,693 psi | 84% | 2959 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 44,657 psi | 70% | 2815 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 82% | 39,407 psi | 62% | 2749 fps | 95% |
| Hodgdon H4350 | <<locked>> | 84% | 45,513 psi | 71% | 2835 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 52,243 psi | 82% | 2946 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,488 psi | 49% | 2546 fps | 97% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,936 psi | 77% | 2923 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 41,684 psi | 65% | 2822 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,672 psi | 42% | 1713 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,096 psi | 79% | 2897 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,634 psi | 82% | 2930 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,992 psi | 72% | 2815 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,443 psi | 76% | 2841 fps | 97.4% |
| IMR 4350 | <<locked>> | 86% | 42,467 psi | 67% | 2759 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,553 psi | 64% | 2703 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 33,272 psi | 52% | 2592 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 48,385 psi | 76% | 2904 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 80% | 53,838 psi | 84% | 2936 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 51,605 psi | 81% | 2907 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,821 psi | 80% | 2864 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,108 psi | 72% | 2815 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,913 psi | 59% | 2651 fps | 95.9% |
| Lovex S070 | <<locked>> | 84% | 41,118 psi | 64% | 2736 fps | 95.8% |
| Lovex S071 | <<locked>> | 96% | 36,738 psi | 58% | 2661 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 50,328 psi | 79% | 2881 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,053 psi | 80% | 2881 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,514 psi | 73% | 2861 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 48,762 psi | 76% | 2913 fps | 95.8% |
| Norma MRP | <<locked>> | 92% | 40,799 psi | 64% | 2844 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 34,606 psi | 54% | 2638 fps | 96.1% |
| Ramshot Big Game | <<locked>> | 80% | 46,862 psi | 73% | 2874 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 38,667 psi | 61% | 2740 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,093 psi | 42% | 1752 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,976 psi | 70% | 2799 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,894 psi | 80% | 2992 fps | 99.8% |
| ReloadSwiss RS 60 | 77.6 gr | 80% | 41,147 psi | 64% | 2851 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,316 psi | 54% | 2651 fps | 95.8% |
| ReloadSwiss RS 70 | 80.8 gr | 82% | 36,318 psi | 57% | 2720 fps | 96% |
| Rottweil R 902 | <<locked>> | 80% | 47,776 psi | 75% | 2828 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,394 psi | 65% | 2749 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 96% | 52,823 psi | 83% | 2949 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 94% | 46,195 psi | 72% | 2887 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 82% | 41,568 psi | 65% | 2726 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,913 psi | 59% | 2651 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,605 psi | 81% | 2907 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,108 psi | 72% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 41,118 psi | 64% | 2736 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,772 psi | 67% | 2805 fps | 99.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,721 psi | 83% | 2930 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,227 psi | 79% | 2900 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,358 psi | 80% | 2822 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,192 psi | 68% | 2680 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 39,711 psi | 62% | 2648 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 45,774 psi | 72% | 2881 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 51,082 psi | 80% | 2815 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 52,460 psi | 82% | 2920 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,916 psi | 66% | 2756 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 31,009 psi | 49% | 2589 fps | 98.2% |
| Somchem S385 | <<locked>> | 92% | 43,758 psi | 69% | 2808 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 51,909 psi | 81% | 2808 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,979 psi | 75% | 2802 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,457 psi | 76% | 2812 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,045 psi | 63% | 2684 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 35,998 psi | 56% | 2641 fps | 96.6% |
| Vihtavuori N165 | <<locked>> | 96% | 43,207 psi | 68% | 2779 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 46,833 psi | 73% | 2802 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,520 psi | 56% | 2638 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 84% | 30,835 psi | 48% | 2575 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,491 psi | 56% | 2612 fps | 98.6% |
| Winchester 760 | <<locked>> | 82% | 39,552 psi | 62% | 2753 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 88% | 28,384 psi | 44% | 2582 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,212 psi | 79% | 2907 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 46,833 psi | 73% | 2854 fps | 95.5% |
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 112 powders for .338 Rem. Ultra Mag. loaded with the .338 | 180gr | Ferrobull Entox Sport. Alliant Reloder-26 delivers the highest muzzle velocity at 3,153 fps; across all powders the maximum-charge window runs from 1,913 fps to 3,153 fps. Accurate 3100 gives the best case fill at 100 %, and 112 of the 112 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 180.0 gr projectile in 0.338" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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 60, Alliant Reloder-16, ReloadSwiss RS 70 rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 180gr | Ferrobull Entox Sport they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, Baschieri & Pellagri 109, Hodgdon H1000 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.