Load Specifications
Load data in caliber .338 Win Mag. with .338 | 200gr | Barnes X S 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 60, Alliant Reloder-17 and Alliant Power Pro 2000-MR.
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 2015 | <<locked>> | 84% | 55,071 psi | 88% | 2687 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 54,636 psi | 88% | 2723 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,259 psi | 89% | 2772 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 55,912 psi | 90% | 2743 fps | 96.2% |
| Accurate 4064 | <<locked>> | 90% | 54,157 psi | 87% | 2762 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 55,999 psi | 90% | 2874 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 86% | 53,664 psi | 86% | 2776 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 92% | 54,404 psi | 87% | 2772 fps | 99.4% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,883 psi | 90% | 2776 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 53,127 psi | 85% | 2713 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 56,086 psi | 90% | 2936 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,375 psi | 87% | 2795 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,143 psi | 88% | 2818 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,316 psi | 85% | 2867 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 96% | 54,491 psi | 87% | 2907 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,943 psi | 62% | 2615 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,105 psi | 69% | 2759 fps | 96.7% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 52,953 psi | 85% | 2782 fps | 99.1% |
| Bofors RP3 | <<locked>> | 92% | 55,274 psi | 89% | 2815 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,317 psi | 89% | 2776 fps | 96.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,360 psi | 87% | 2713 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,463 psi | 89% | 2812 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 53,113 psi | 85% | 2844 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 92% | 56,043 psi | 90% | 2822 fps | 99% |
| Hodgdon H414 | <<locked>> | 98% | 54,795 psi | 88% | 2861 fps | 97.1% |
| Hodgdon H4350 | <<locked>> | 96% | 55,709 psi | 89% | 2822 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 86% | 54,215 psi | 87% | 2789 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,806 psi | 80% | 2753 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 56,391 psi | 90% | 2864 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,767 psi | 89% | 2894 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,781 psi | 57% | 1696 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,071 psi | 88% | 2785 fps | 99.9% |
| IMR 3031 | <<locked>> | 86% | 53,940 psi | 86% | 2776 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 53,867 psi | 86% | 2756 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,099 psi | 87% | 2730 fps | 96.8% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,911 psi | 88% | 2792 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 94% | 53,417 psi | 86% | 2753 fps | 96.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,808 psi | 85% | 2808 fps | 99% |
| IMR 4895 | <<locked>> | 88% | 53,171 psi | 85% | 2799 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 86% | 55,883 psi | 90% | 2776 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 53,563 psi | 86% | 2759 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 56,347 psi | 90% | 2749 fps | 99.8% |
| Lovex S062 | <<locked>> | 90% | 54,244 psi | 87% | 2762 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 56,391 psi | 90% | 2802 fps | 98.4% |
| Lovex S070 | <<locked>> | 98% | 53,911 psi | 86% | 2782 fps | 97% |
| Norma 201 | <<locked>> | 88% | 56,304 psi | 90% | 2779 fps | 100% |
| Norma 202 | <<locked>> | 88% | 56,333 psi | 90% | 2776 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,331 psi | 87% | 2805 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 54,607 psi | 88% | 2854 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 90% | 54,302 psi | 87% | 2825 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,519 psi | 86% | 2848 fps | 97.6% |
| Ramshot TAC | <<locked>> | 86% | 56,086 psi | 90% | 2792 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,796 psi | 89% | 2812 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,606 psi | 86% | 2730 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,216 psi | 58% | 1736 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,550 psi | 89% | 2762 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 56,260 psi | 90% | 2802 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 55,216 psi | 89% | 2881 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 54,404 psi | 87% | 2913 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 55,027 psi | 88% | 2887 fps | 99.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,940 psi | 88% | 2910 fps | 98.7% |
| Rottweil R 901 | <<locked>> | 84% | 54,520 psi | 87% | 2717 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,548 psi | 86% | 2730 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,042 psi | 88% | 2805 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 96% | 55,317 psi | 89% | 2776 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 98% | 56,391 psi | 90% | 2802 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,563 psi | 86% | 2759 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,244 psi | 87% | 2762 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 53,911 psi | 86% | 2782 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 56,014 psi | 90% | 2858 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 54,868 psi | 88% | 2772 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,303 psi | 89% | 2799 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,201 psi | 87% | 2671 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 53,969 psi | 87% | 2667 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 53,403 psi | 86% | 2703 fps | 96.6% |
| Somchem S321 | <<locked>> | 82% | 53,751 psi | 86% | 2762 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,737 psi | 86% | 2671 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,099 psi | 87% | 2762 fps | 99.6% |
| Somchem S355 | <<locked>> | 94% | 55,317 psi | 89% | 2802 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,269 psi | 79% | 2812 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 54,027 psi | 87% | 2638 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,172 psi | 87% | 2657 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,014 psi | 90% | 2740 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,301 psi | 85% | 2707 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 53,156 psi | 85% | 2733 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 53,824 psi | 86% | 2802 fps | 98.9% |
| Vihtavuori N530 | <<locked>> | 86% | 56,376 psi | 90% | 2776 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 54,853 psi | 88% | 2753 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 56,289 psi | 90% | 2858 fps | 99.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,337 psi | 68% | 2697 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,172 psi | 87% | 2782 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 56,159 psi | 90% | 2825 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 55,056 psi | 88% | 2864 fps | 97.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,273 psi | 57% | 2608 fps | 97.2% |
| Winchester StaBALL Match | <<locked>> | 88% | 55,100 psi | 88% | 2805 fps | 99.9% |
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% | 49,124 psi | 79% | 2602 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,975 psi | 69% | 2546 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,588 psi | 78% | 2674 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 52,417 psi | 84% | 2687 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 40,538 psi | 65% | 2536 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 35,766 psi | 57% | 2507 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 44,976 psi | 72% | 2625 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 80% | 38,406 psi | 62% | 2480 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,847 psi | 75% | 2635 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 80% | 47,036 psi | 75% | 2625 fps | 100% |
| Alliant Power Pro 2000-MR | 58.7 gr | 80% | 40,712 psi | 65% | 2648 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,247 psi | 61% | 2507 fps | 98.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,857 psi | 66% | 2566 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 37,797 psi | 61% | 2559 fps | 95.8% |
| Alliant Reloder-17 | 57.8 gr | 80% | 33,156 psi | 53% | 2470 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 32,982 psi | 53% | 2467 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 40,364 psi | 65% | 2700 fps | 95.7% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,888 psi | 70% | 2625 fps | 97.6% |
| Bofors RP3 | <<locked>> | 80% | 38,247 psi | 61% | 2516 fps | 98.2% |
| Bofors RP7 | <<locked>> | 92% | 49,255 psi | 79% | 2677 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,428 psi | 78% | 2618 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,832 psi | 73% | 2657 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,661 psi | 80% | 2789 fps | 99% |
| Hodgdon H380 | <<locked>> | 80% | 38,827 psi | 62% | 2513 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 94% | 48,399 psi | 78% | 2753 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 94% | 52,417 psi | 84% | 2769 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 45,411 psi | 73% | 2638 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 31,125 psi | 50% | 2362 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,089 psi | 66% | 2608 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 96% | 52,098 psi | 84% | 2835 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,876 psi | 43% | 1519 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,337 psi | 69% | 2585 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 44,846 psi | 72% | 2635 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,321 psi | 65% | 2513 fps | 97.3% |
| IMR 4166 Enduron | <<locked>> | 84% | 48,008 psi | 77% | 2628 fps | 95.4% |
| IMR 4350 | <<locked>> | 98% | 51,677 psi | 83% | 2743 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 47,616 psi | 76% | 2651 fps | 95.2% |
| IMR 4831 | <<locked>> | 88% | 36,680 psi | 59% | 2510 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 41,843 psi | 67% | 2595 fps | 98.2% |
| IMR 8208 XBR | <<locked>> | 80% | 46,847 psi | 75% | 2635 fps | 99.6% |
| Lovex D073.6 | <<locked>> | 80% | 44,251 psi | 71% | 2612 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,904 psi | 72% | 2562 fps | 98.7% |
| Lovex S062 | <<locked>> | 80% | 40,582 psi | 65% | 2526 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 42,453 psi | 68% | 2559 fps | 95.5% |
| Lovex S070 | <<locked>> | 92% | 45,179 psi | 72% | 2631 fps | 95% |
| Norma 201 | <<locked>> | 80% | 44,570 psi | 71% | 2589 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 44,483 psi | 71% | 2592 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,263 psi | 65% | 2556 fps | 97.8% |
| Norma URP | <<locked>> | 88% | 37,956 psi | 61% | 2549 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 39,508 psi | 63% | 2562 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 94% | 44,454 psi | 71% | 2687 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 46,673 psi | 75% | 2635 fps | 96.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,977 psi | 74% | 2654 fps | 98.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,343 psi | 81% | 2677 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,180 psi | 44% | 1552 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,243 psi | 84% | 2713 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 44,179 psi | 71% | 2595 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,409 psi | 68% | 2661 fps | 97.8% |
| ReloadSwiss RS 60 | 57.8 gr | 80% | 35,085 psi | 56% | 2536 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 37,536 psi | 60% | 2569 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 40,045 psi | 64% | 2621 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 48,834 psi | 78% | 2631 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,540 psi | 68% | 2539 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 80% | 36,129 psi | 58% | 2464 fps | 97.4% |
| Rottweil R 907 | <<locked>> | 92% | 49,255 psi | 79% | 2677 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,453 psi | 68% | 2559 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,251 psi | 71% | 2612 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,582 psi | 65% | 2526 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 45,179 psi | 72% | 2631 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,448 psi | 58% | 2500 fps | 96.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,339 psi | 73% | 2615 fps | 97.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,366 psi | 70% | 2595 fps | 98.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,498 psi | 73% | 2536 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,043 psi | 61% | 2408 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 47,253 psi | 76% | 2605 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 50,604 psi | 81% | 2713 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 45,281 psi | 73% | 2543 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,701 psi | 72% | 2608 fps | 98.5% |
| Somchem S355 | <<locked>> | 80% | 36,811 psi | 59% | 2467 fps | 97.3% |
| Somchem S365 | <<locked>> | 82% | 28,776 psi | 46% | 2356 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 51,039 psi | 82% | 2595 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,600 psi | 73% | 2530 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,727 psi | 67% | 2526 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,061 psi | 67% | 2530 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,911 psi | 56% | 2405 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 37,246 psi | 60% | 2500 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 46,963 psi | 75% | 2628 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 40,669 psi | 65% | 2520 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 39,044 psi | 63% | 2556 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 94% | 35,317 psi | 57% | 2543 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,096 psi | 50% | 2326 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 46,224 psi | 74% | 2671 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 45,774 psi | 73% | 2707 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 98% | 33,272 psi | 53% | 2549 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,801 psi | 69% | 2602 fps | 98.8% |
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 Win Mag. loaded with the .338 | 200gr | Barnes X S. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,936 fps; across all powders the maximum-charge window runs from 1,696 fps to 2,936 fps. Accurate 4350 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 (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 200.0 gr projectile in 0.338" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, 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 60, Alliant Reloder-17, Alliant Power Pro 2000-MR rank at the top here: for .338 Win Mag. with the .338 | 200gr | Barnes X S 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.