Load Specifications
Bullet Manufacturer:Peregrine
Bullet Weight:206 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:1:12.5
Load data in caliber .338 Rem. Ultra Mag. with .338 | 206gr | Peregrine VLR-5 bullet and 101 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-26 and Accurate High Country.
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>> | 82% | 54,578 psi | 86% | 2717 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 56,231 psi | 88% | 2789 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 54,433 psi | 85% | 2825 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 55,027 psi | 86% | 2769 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 56,405 psi | 88% | 2877 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 55,970 psi | 88% | 2969 fps | 97.9% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 57,217 psi | 90% | 2966 fps | 96.8% |
| ADI AR 2206H | <<locked>> | 82% | 57,711 psi | 90% | 2848 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 55,521 psi | 87% | 2805 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 57,696 psi | 90% | 2923 fps | 98.7% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 55,361 psi | 87% | 2913 fps | 97.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 55,114 psi | 86% | 2927 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,056 psi | 85% | 2861 fps | 98.2% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,056 psi | 85% | 2861 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 56,275 psi | 88% | 2825 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,565 psi | 89% | 2851 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 57,348 psi | 90% | 2933 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 55,056 psi | 86% | 2904 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 57,014 psi | 89% | 2910 fps | 98.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,288 psi | 85% | 2907 fps | 98.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,329 psi | 80% | 2844 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 44,469 psi | 70% | 2769 fps | 99.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 55,274 psi | 87% | 2976 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 49,617 psi | 78% | 2831 fps | 97.5% |
| Bofors RP3 | <<locked>> | 86% | 57,261 psi | 90% | 2841 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,288 psi | 85% | 2907 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 56,521 psi | 89% | 2828 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 86% | 57,667 psi | 90% | 2861 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 55,085 psi | 86% | 2877 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 88% | 54,766 psi | 86% | 2835 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 98% | 55,535 psi | 87% | 2861 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,476 psi | 85% | 2844 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 54,070 psi | 85% | 2808 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 55,405 psi | 87% | 2844 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 43,569 psi | 68% | 2799 fps | 96.8% |
| Hodgdon Superformance | <<locked>> | 90% | 55,608 psi | 87% | 2910 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,143 psi | 57% | 1781 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,970 psi | 88% | 2812 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,897 psi | 86% | 2789 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 57,653 psi | 90% | 2825 fps | 99.5% |
| IMR 4350 | <<locked>> | 92% | 54,404 psi | 85% | 2812 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,868 psi | 86% | 2805 fps | 99.2% |
| IMR 4831 | <<locked>> | 94% | 56,855 psi | 89% | 2867 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,331 psi | 85% | 2825 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 56,985 psi | 89% | 2848 fps | 97.2% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 52,852 psi | 83% | 2887 fps | 97% |
| Lovex S060 | <<locked>> | 82% | 56,536 psi | 89% | 2779 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 55,100 psi | 86% | 2782 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,868 psi | 86% | 2802 fps | 99.8% |
| Lovex S070 | <<locked>> | 92% | 56,231 psi | 88% | 2841 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,947 psi | 70% | 2677 fps | 98.7% |
| Norma 201 | <<locked>> | 82% | 56,362 psi | 88% | 2792 fps | 100% |
| Norma 202 | <<locked>> | 82% | 57,246 psi | 90% | 2789 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,811 psi | 87% | 2835 fps | 100% |
| Norma 204 | <<locked>> | 92% | 55,259 psi | 87% | 2861 fps | 98.2% |
| Norma MRP | <<locked>> | 98% | 54,041 psi | 85% | 2936 fps | 99.4% |
| Norma URP | <<locked>> | 92% | 55,129 psi | 86% | 2864 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 57,029 psi | 89% | 2861 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,316 psi | 84% | 2904 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 92% | 54,186 psi | 85% | 2864 fps | 99.7% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,471 psi | 74% | 2776 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,811 psi | 58% | 1824 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 57,624 psi | 90% | 2844 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 54,404 psi | 85% | 2897 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 56,594 psi | 89% | 2900 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 55,114 psi | 86% | 2927 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,555 psi | 68% | 2789 fps | 97.9% |
| Rottweil R 902 | <<locked>> | 84% | 56,869 psi | 89% | 2792 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 57,290 psi | 90% | 2838 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 55,608 psi | 87% | 2835 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 98% | 56,130 psi | 88% | 2894 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 90% | 56,521 psi | 89% | 2828 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,868 psi | 86% | 2802 fps | 99.8% |
| Shooters World Precision | <<locked>> | 84% | 55,100 psi | 86% | 2782 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 56,231 psi | 88% | 2841 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 55,579 psi | 87% | 2848 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 56,333 psi | 88% | 2822 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 57,159 psi | 90% | 2726 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,708 psi | 86% | 2680 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 54,563 psi | 86% | 2753 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 55,637 psi | 87% | 2887 fps | 98.6% |
| Somchem S335 | <<locked>> | 82% | 56,855 psi | 89% | 2720 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 57,305 psi | 90% | 2835 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 57,725 psi | 90% | 2831 fps | 97.1% |
| Somchem S365 | <<locked>> | 94% | 54,549 psi | 85% | 2864 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 56,913 psi | 89% | 2867 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 82% | 57,711 psi | 90% | 2707 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 57,493 psi | 90% | 2753 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 54,186 psi | 85% | 2720 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 55,056 psi | 86% | 2759 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 57,406 psi | 90% | 2858 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 52,620 psi | 82% | 2792 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 84% | 56,014 psi | 88% | 2762 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 56,507 psi | 89% | 2861 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 57,159 psi | 90% | 2917 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,317 psi | 85% | 2923 fps | 96.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 57,392 psi | 90% | 2822 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 55,274 psi | 87% | 2881 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,499 psi | 73% | 2900 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 56,652 psi | 89% | 2828 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 57,377 psi | 90% | 2867 fps | 98.7% |
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% | 50,908 psi | 80% | 2667 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 49,139 psi | 77% | 2677 fps | 97.9% |
| Accurate 3100 | <<locked>> | 86% | 33,141 psi | 52% | 2438 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 48,269 psi | 76% | 2674 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,840 psi | 58% | 2543 fps | 98.2% |
| Accurate High Country | 85 gr | 92% | 44,933 psi | 70% | 2779 fps | 95.2% |
| Accurate MAGPRO | <<locked>> | 96% | 49,284 psi | 77% | 2841 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 54,259 psi | 85% | 2802 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 46,021 psi | 72% | 2657 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 88% | 41,234 psi | 65% | 2635 fps | 95% |
| ADI AR 2213 | <<locked>> | 96% | 48,356 psi | 76% | 2795 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 51,213 psi | 80% | 2867 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,466 psi | 65% | 2641 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 41,466 psi | 65% | 2641 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,383 psi | 73% | 2680 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,705 psi | 78% | 2746 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,056 psi | 56% | 2556 fps | 98.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 41,046 psi | 64% | 2677 fps | 99.9% |
| Alliant Reloder-19 | <<locked>> | 88% | 41,017 psi | 64% | 2631 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 92% | 41,220 psi | 65% | 2677 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,150 psi | 41% | 2303 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 90% | 31,981 psi | 50% | 2480 fps | 95.2% |
| Alliant Reloder-26 | 78.1 gr | 82% | 30,124 psi | 47% | 2470 fps | 95.2% |
| Bofors RP15 | <<locked>> | 94% | 40,654 psi | 64% | 2664 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 46,586 psi | 73% | 2687 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 41,220 psi | 65% | 2677 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 41,104 psi | 64% | 2562 fps | 96.2% |
| Hodgdon H380 | <<locked>> | 80% | 47,137 psi | 74% | 2700 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 80% | 39,030 psi | 61% | 2589 fps | 96.2% |
| Hodgdon H4350 | <<locked>> | 80% | 41,959 psi | 66% | 2612 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 94% | 48,327 psi | 76% | 2743 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 96% | 50,821 psi | 80% | 2785 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,591 psi | 53% | 2451 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,619 psi | 81% | 2792 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 40,712 psi | 64% | 2733 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 38,145 psi | 60% | 2598 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,021 psi | 42% | 1598 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,402 psi | 82% | 2759 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,399 psi | 76% | 2690 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,778 psi | 80% | 2720 fps | 98.8% |
| IMR 4350 | <<locked>> | 82% | 39,233 psi | 61% | 2543 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,554 psi | 67% | 2595 fps | 97.1% |
| IMR 4831 | <<locked>> | 80% | 35,476 psi | 56% | 2497 fps | 97.9% |
| IMR 4895 | <<locked>> | 80% | 51,010 psi | 80% | 2776 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 50,183 psi | 79% | 2743 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 96% | 45,948 psi | 72% | 2762 fps | 95.1% |
| Lovex S060 | <<locked>> | 80% | 52,968 psi | 83% | 2726 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,414 psi | 76% | 2684 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,871 psi | 62% | 2543 fps | 97.7% |
| Lovex S070 | <<locked>> | 80% | 38,130 psi | 60% | 2523 fps | 96.1% |
| Lovex S071 | <<locked>> | 92% | 34,374 psi | 54% | 2467 fps | 95.8% |
| Norma 201 | <<locked>> | 80% | 52,750 psi | 83% | 2743 fps | 100% |
| Norma 202 | <<locked>> | 80% | 53,577 psi | 84% | 2740 fps | 100% |
| Norma 203B | <<locked>> | 80% | 49,037 psi | 77% | 2733 fps | 100% |
| Norma 204 | <<locked>> | 84% | 41,640 psi | 65% | 2628 fps | 95% |
| Norma MRP | <<locked>> | 88% | 37,579 psi | 59% | 2628 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 36,811 psi | 58% | 2539 fps | 98% |
| Ramshot Big Game | <<locked>> | 80% | 49,588 psi | 78% | 2756 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 45,890 psi | 72% | 2772 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 35,766 psi | 56% | 2526 fps | 96.1% |
| Ramshot Magnum | <<locked>> | 96% | 40,828 psi | 64% | 2648 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,398 psi | 43% | 1634 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,210 psi | 74% | 2684 fps | 98.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,685 psi | 68% | 2733 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,811 psi | 58% | 2559 fps | 97.9% |
| ReloadSwiss RS 70 | 75.5 gr | 80% | 35,839 psi | 56% | 2566 fps | 97.3% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 37,623 psi | 59% | 2654 fps | 95.7% |
| Rottweil R 902 | <<locked>> | 80% | 50,198 psi | 79% | 2697 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,845 psi | 69% | 2635 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 45,730 psi | 72% | 2674 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 90% | 42,728 psi | 67% | 2667 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 41,104 psi | 64% | 2562 fps | 96.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,871 psi | 62% | 2543 fps | 97.7% |
| Shooters World Precision | <<locked>> | 80% | 48,414 psi | 76% | 2684 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,130 psi | 60% | 2523 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 45,310 psi | 71% | 2690 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,808 psi | 83% | 2772 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 53,606 psi | 84% | 2680 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,295 psi | 71% | 2549 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,059 psi | 61% | 2487 fps | 96.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 42,337 psi | 66% | 2661 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 53,345 psi | 84% | 2674 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 44,164 psi | 69% | 2635 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 50,299 psi | 79% | 2717 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 33,228 psi | 52% | 2497 fps | 99.6% |
| Somchem S385 | <<locked>> | 86% | 37,826 psi | 59% | 2539 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 54,215 psi | 85% | 2661 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 50,502 psi | 79% | 2661 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,894 psi | 80% | 2674 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,279 psi | 66% | 2566 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,276 psi | 60% | 2543 fps | 98.4% |
| Vihtavuori N165 | <<locked>> | 92% | 40,016 psi | 63% | 2572 fps | 95.5% |
| Vihtavuori N540 | <<locked>> | 80% | 49,168 psi | 77% | 2667 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,681 psi | 59% | 2539 fps | 98.1% |
| Vihtavuori N555 | <<locked>> | 80% | 28,805 psi | 45% | 2379 fps | 95.9% |
| Vihtavuori N560 | <<locked>> | 94% | 47,166 psi | 74% | 2802 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,594 psi | 59% | 2513 fps | 99.7% |
| Winchester 760 | <<locked>> | 80% | 39,146 psi | 61% | 2592 fps | 96.3% |
| Winchester StaBALL HD | <<locked>> | 82% | 24,627 psi | 39% | 2326 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,837 psi | 83% | 2776 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 43,062 psi | 67% | 2638 fps | 95.7% |
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 101 powders for .338 Rem. Ultra Mag. loaded with the .338 | 206gr | Peregrine VLR-5. Alliant Reloder-26 delivers the highest muzzle velocity at 2,976 fps; across all powders the maximum-charge window runs from 1,781 fps to 2,976 fps. Accurate 3100 gives the best case fill at 100 %, and 101 of the 101 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 206.0 gr projectile in 0.338" calls for a 1:12.5 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 70, Alliant Reloder-26, Accurate High Country rank at the top here: for .338 Rem. Ultra Mag. with the .338 | 206gr | Peregrine VLR-5 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.