Load Specifications
Load data in caliber .338 Win Mag. with .338 | 210gr | Barnes X BT bullet and 96 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, 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 2015 | <<locked>> | 84% | 56,275 psi | 90% | 2631 fps | 100% |
| Accurate 2495 | <<locked>> | 82% | 53,432 psi | 86% | 2644 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,708 psi | 88% | 2703 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 54,621 psi | 88% | 2648 fps | 96.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 43,366 psi | 70% | 2572 fps | 95.9% |
| Accurate 4064 | <<locked>> | 88% | 53,983 psi | 87% | 2680 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,317 psi | 89% | 2785 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 86% | 55,883 psi | 90% | 2733 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 56,260 psi | 90% | 2726 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,621 psi | 88% | 2684 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,709 psi | 89% | 2664 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 54,694 psi | 88% | 2838 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 53,592 psi | 86% | 2710 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 53,983 psi | 87% | 2726 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 55,608 psi | 89% | 2828 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,476 psi | 86% | 2818 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,017 psi | 66% | 2595 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,513 psi | 73% | 2746 fps | 97.9% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,085 psi | 88% | 2743 fps | 99.5% |
| Bofors RP3 | <<locked>> | 90% | 54,578 psi | 88% | 2730 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,230 psi | 87% | 2687 fps | 96.7% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,420 psi | 90% | 2667 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 53,301 psi | 85% | 2710 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,534 psi | 87% | 2795 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 82% | 54,795 psi | 88% | 2671 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,013 psi | 88% | 2733 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 94% | 55,506 psi | 89% | 2799 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 98% | 55,071 psi | 88% | 2746 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 86% | 56,391 psi | 90% | 2743 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,301 psi | 84% | 2717 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,244 psi | 87% | 2762 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,244 psi | 87% | 2802 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,984 psi | 58% | 1650 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,042 psi | 88% | 2717 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 54,969 psi | 88% | 2707 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,317 psi | 89% | 2703 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 92% | 54,723 psi | 88% | 2671 fps | 97.3% |
| IMR 4350 | <<locked>> | 98% | 53,925 psi | 86% | 2710 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,723 psi | 88% | 2707 fps | 97.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,734 psi | 80% | 2690 fps | 98.9% |
| IMR 4895 | <<locked>> | 88% | 55,274 psi | 89% | 2756 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 84% | 54,621 psi | 88% | 2684 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,188 psi | 90% | 2717 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,100 psi | 88% | 2657 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 56,362 psi | 90% | 2713 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,666 psi | 89% | 2717 fps | 98.6% |
| Lovex S070 | <<locked>> | 98% | 56,333 psi | 90% | 2749 fps | 97.8% |
| Norma 201 | <<locked>> | 86% | 55,288 psi | 89% | 2687 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,201 psi | 89% | 2684 fps | 100% |
| Norma 203B | <<locked>> | 88% | 53,258 psi | 85% | 2713 fps | 99.8% |
| Norma URP | <<locked>> | 98% | 53,853 psi | 86% | 2769 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 88% | 53,113 psi | 85% | 2733 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 55,840 psi | 90% | 2812 fps | 98.4% |
| Ramshot TAC | <<locked>> | 84% | 54,853 psi | 88% | 2700 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,331 psi | 87% | 2717 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,434 psi | 89% | 2684 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,709 psi | 59% | 1693 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,187 psi | 88% | 2713 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,143 psi | 87% | 2785 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,287 psi | 85% | 2822 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,346 psi | 87% | 2805 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,954 psi | 87% | 2822 fps | 99% |
| Rottweil R 901 | <<locked>> | 82% | 53,954 psi | 87% | 2631 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,782 psi | 89% | 2684 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,433 psi | 87% | 2720 fps | 100% |
| Rottweil R 907 | <<locked>> | 94% | 54,230 psi | 87% | 2687 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,666 psi | 89% | 2717 fps | 98.6% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,188 psi | 90% | 2717 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,362 psi | 90% | 2713 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,143 psi | 88% | 2736 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,071 psi | 88% | 2769 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,766 psi | 86% | 2684 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,128 psi | 87% | 2703 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,101 psi | 90% | 2621 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,086 psi | 90% | 2621 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,695 psi | 89% | 2667 fps | 97.4% |
| Somchem S321 | <<locked>> | 82% | 56,072 psi | 90% | 2717 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,767 psi | 89% | 2621 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,246 psi | 90% | 2720 fps | 99.9% |
| Somchem S355 | <<locked>> | 92% | 54,520 psi | 87% | 2717 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,735 psi | 83% | 2776 fps | 100% |
| Unknown powder | <<locked>> | 96% | 54,882 psi | 88% | 2776 fps | 99% |
| Vihtavuori N130 | <<locked>> | 82% | 55,056 psi | 88% | 2575 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,593 psi | 89% | 2602 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,041 psi | 87% | 2641 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,839 psi | 88% | 2654 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,492 psi | 89% | 2697 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,347 psi | 89% | 2746 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 82% | 54,534 psi | 87% | 2690 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,607 psi | 88% | 2684 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 55,883 psi | 90% | 2799 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,962 psi | 72% | 2674 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 56,376 psi | 90% | 2743 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 55,419 psi | 89% | 2736 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 55,506 psi | 89% | 2799 fps | 97.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,202 psi | 60% | 2602 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 2015 | <<locked>> | 80% | 50,111 psi | 80% | 2546 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 50,227 psi | 81% | 2598 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,240 psi | 77% | 2608 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 48,138 psi | 77% | 2546 fps | 95% |
| Accurate 3100 | <<locked>> | 98% | 40,683 psi | 65% | 2523 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 42,830 psi | 69% | 2503 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 35,824 psi | 57% | 2438 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 46,905 psi | 75% | 2589 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 40,045 psi | 64% | 2448 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,660 psi | 78% | 2592 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 49,414 psi | 79% | 2582 fps | 100% |
| Alliant Power Pro 2000-MR | 57.8 gr | 80% | 42,569 psi | 68% | 2621 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,103 psi | 64% | 2474 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,801 psi | 69% | 2533 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 35,447 psi | 57% | 2434 fps | 95.4% |
| Alliant Reloder-17 | 56.9 gr | 80% | 34,867 psi | 56% | 2451 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 90% | 31,285 psi | 50% | 2356 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 94% | 37,681 psi | 60% | 2572 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,847 psi | 74% | 2592 fps | 98.3% |
| Bofors RP3 | <<locked>> | 80% | 40,321 psi | 65% | 2490 fps | 99% |
| Bofors RP7 | <<locked>> | 90% | 48,486 psi | 78% | 2592 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,357 psi | 81% | 2575 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 46,920 psi | 75% | 2608 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,908 psi | 82% | 2740 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 51,401 psi | 82% | 2621 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,770 psi | 65% | 2484 fps | 96.5% |
| Hodgdon H414 | <<locked>> | 88% | 45,890 psi | 74% | 2638 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 96% | 52,040 psi | 83% | 2700 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 47,282 psi | 76% | 2598 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 31,154 psi | 50% | 2297 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,047 psi | 67% | 2562 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 92% | 47,558 psi | 76% | 2687 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,151 psi | 44% | 1476 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,278 psi | 66% | 2484 fps | 98.7% |
| IMR 3031 | <<locked>> | 80% | 43,497 psi | 70% | 2536 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,508 psi | 63% | 2428 fps | 97.6% |
| IMR 4166 Enduron | <<locked>> | 86% | 46,340 psi | 74% | 2530 fps | 95.5% |
| IMR 4350 | <<locked>> | 94% | 48,037 psi | 77% | 2612 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 45,861 psi | 74% | 2559 fps | 95.3% |
| IMR 4831 | <<locked>> | 88% | 35,288 psi | 57% | 2411 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 43,758 psi | 70% | 2562 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 48,660 psi | 78% | 2592 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 46,731 psi | 75% | 2579 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,673 psi | 75% | 2523 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 42,641 psi | 68% | 2493 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 39,740 psi | 64% | 2438 fps | 95.2% |
| Lovex S070 | <<locked>> | 90% | 44,788 psi | 72% | 2556 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 46,514 psi | 75% | 2549 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 46,369 psi | 74% | 2552 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,206 psi | 68% | 2523 fps | 98.6% |
| Norma URP | <<locked>> | 84% | 35,578 psi | 57% | 2428 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 41,481 psi | 67% | 2533 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 41,437 psi | 66% | 2559 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 48,602 psi | 78% | 2598 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,051 psi | 77% | 2618 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,315 psi | 84% | 2638 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,514 psi | 44% | 1512 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 43,308 psi | 69% | 2510 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,657 psi | 72% | 2631 fps | 98.6% |
| ReloadSwiss RS 60 | 56.9 gr | 80% | 36,854 psi | 59% | 2513 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 37,362 psi | 60% | 2497 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 39,436 psi | 63% | 2546 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 51,039 psi | 82% | 2585 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,628 psi | 72% | 2507 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 38,145 psi | 61% | 2438 fps | 98.3% |
| Rottweil R 907 | <<locked>> | 90% | 48,486 psi | 78% | 2592 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 39,740 psi | 64% | 2438 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,731 psi | 75% | 2579 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,641 psi | 68% | 2493 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 43,642 psi | 70% | 2543 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,276 psi | 61% | 2474 fps | 97.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,514 psi | 76% | 2582 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,252 psi | 73% | 2559 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,369 psi | 76% | 2493 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,755 psi | 64% | 2372 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 46,441 psi | 74% | 2523 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 52,866 psi | 85% | 2671 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 47,123 psi | 76% | 2497 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,804 psi | 75% | 2575 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 38,667 psi | 62% | 2438 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 28,834 psi | 46% | 2290 fps | 96.3% |
| Unknown powder | <<locked>> | 84% | 38,261 psi | 61% | 2477 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 51,982 psi | 83% | 2533 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,585 psi | 71% | 2444 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,743 psi | 69% | 2474 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,511 psi | 70% | 2484 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,446 psi | 54% | 2306 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 82% | 36,085 psi | 58% | 2402 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 51,227 psi | 82% | 2641 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,134 psi | 69% | 2503 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 36,738 psi | 59% | 2451 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 90% | 33,591 psi | 54% | 2434 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,663 psi | 52% | 2306 fps | 96.4% |
| Winchester 748 | <<locked>> | 80% | 52,127 psi | 84% | 2690 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 45,890 psi | 74% | 2638 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 94% | 31,430 psi | 50% | 2434 fps | 95.9% |
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 96 powders for .338 Win Mag. loaded with the .338 | 210gr | Barnes X BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,838 fps; across all powders the maximum-charge window runs from 1,650 fps to 2,838 fps. Accurate 3100 gives the best case fill at 100 %, and 96 of the 96 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 210.0 gr projectile in 0.338" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, 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. Alliant Power Pro 2000-MR, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for .338 Win Mag. with the .338 | 210gr | Barnes X BT 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.