Load Specifications
Load data in caliber .338 Win Mag. with .338 | 215gr | Sierra GameKing bullet and 95 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, Hodgdon Superformance 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% | 54,766 psi | 88% | 2612 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,577 psi | 86% | 2638 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,216 psi | 89% | 2700 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 56,173 psi | 90% | 2687 fps | 97.3% |
| Accurate 4064 | <<locked>> | 90% | 53,417 psi | 86% | 2680 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 52,939 psi | 85% | 2759 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 86% | 53,983 psi | 87% | 2713 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 92% | 54,897 psi | 88% | 2710 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 86% | 56,405 psi | 90% | 2710 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 53,809 psi | 86% | 2641 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 53,374 psi | 86% | 2822 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 54,737 psi | 88% | 2730 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,506 psi | 89% | 2756 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,389 psi | 87% | 2815 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,637 psi | 89% | 2851 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,899 psi | 62% | 2562 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,192 psi | 69% | 2710 fps | 97.9% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 53,693 psi | 86% | 2726 fps | 99.6% |
| Bofors RP3 | <<locked>> | 92% | 55,492 psi | 89% | 2749 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,463 psi | 89% | 2717 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,723 psi | 88% | 2648 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 55,753 psi | 89% | 2743 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,070 psi | 87% | 2785 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 53,040 psi | 85% | 2710 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 98% | 55,956 psi | 90% | 2812 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 94% | 53,156 psi | 85% | 2720 fps | 96.4% |
| Hodgdon H4895 | <<locked>> | 86% | 54,491 psi | 87% | 2720 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,517 psi | 81% | 2694 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 53,664 psi | 86% | 2753 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 52,910 psi | 85% | 2789 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,418 psi | 57% | 1644 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 55,724 psi | 89% | 2723 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,505 psi | 87% | 2703 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,302 psi | 87% | 2694 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,433 psi | 87% | 2674 fps | 97.8% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,738 psi | 89% | 2743 fps | 97.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,099 psi | 87% | 2700 fps | 97.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,447 psi | 86% | 2749 fps | 99.6% |
| IMR 4895 | <<locked>> | 88% | 53,417 psi | 86% | 2733 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 56,405 psi | 90% | 2710 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 53,519 psi | 86% | 2687 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,693 psi | 86% | 2644 fps | 99.9% |
| Lovex S062 | <<locked>> | 90% | 54,288 psi | 87% | 2690 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,359 psi | 86% | 2690 fps | 98.7% |
| Lovex S070 | <<locked>> | 98% | 54,128 psi | 87% | 2723 fps | 98% |
| Norma 201 | <<locked>> | 88% | 56,217 psi | 90% | 2707 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,214 psi | 85% | 2661 fps | 100% |
| Norma 203B | <<locked>> | 90% | 54,665 psi | 88% | 2740 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 55,521 psi | 89% | 2795 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 55,216 psi | 89% | 2766 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,476 psi | 87% | 2795 fps | 98.7% |
| Ramshot TAC | <<locked>> | 84% | 53,156 psi | 85% | 2680 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 86% | 56,289 psi | 90% | 2749 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,824 psi | 86% | 2664 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,984 psi | 58% | 1686 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,811 psi | 89% | 2690 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,200 psi | 85% | 2690 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 55,970 psi | 90% | 2818 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,332 psi | 89% | 2851 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 56,231 psi | 90% | 2831 fps | 99.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 55,927 psi | 90% | 2861 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 84% | 53,925 psi | 86% | 2644 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,316 psi | 85% | 2657 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,361 psi | 89% | 2740 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 55,463 psi | 89% | 2717 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,359 psi | 86% | 2690 fps | 98.7% |
| Shooters World Match Rifle | <<locked>> | 86% | 53,519 psi | 86% | 2687 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,288 psi | 87% | 2690 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,128 psi | 87% | 2723 fps | 98% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 53,505 psi | 86% | 2749 fps | 99.9% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,201 psi | 89% | 2713 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 55,782 psi | 89% | 2733 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,230 psi | 87% | 2598 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,404 psi | 87% | 2598 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 53,577 psi | 86% | 2644 fps | 97.6% |
| Somchem S321 | <<locked>> | 82% | 54,157 psi | 87% | 2697 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 53,693 psi | 86% | 2602 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,795 psi | 88% | 2703 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 55,695 psi | 89% | 2736 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 49,908 psi | 80% | 2749 fps | 100% |
| Vihtavuori N130 | <<locked>> | 82% | 54,114 psi | 87% | 2566 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 54,476 psi | 87% | 2585 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 56,391 psi | 90% | 2667 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 53,664 psi | 86% | 2641 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 53,650 psi | 86% | 2671 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 54,665 psi | 88% | 2746 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 84% | 53,287 psi | 85% | 2661 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,390 psi | 89% | 2684 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 53,693 psi | 86% | 2749 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,351 psi | 68% | 2635 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 54,955 psi | 88% | 2726 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 53,127 psi | 85% | 2707 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 55,956 psi | 90% | 2812 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,766 psi | 56% | 2559 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 88% | 55,579 psi | 89% | 2740 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% | 48,617 psi | 78% | 2526 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,292 psi | 66% | 2457 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,124 psi | 77% | 2602 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 46,340 psi | 74% | 2530 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 39,001 psi | 63% | 2454 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,663 psi | 52% | 2382 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 44,715 psi | 72% | 2559 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 38,101 psi | 61% | 2418 fps | 97.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,775 psi | 75% | 2566 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 47,166 psi | 76% | 2552 fps | 100% |
| Alliant Power Pro 2000-MR | 59.6 gr | 80% | 40,712 psi | 65% | 2592 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,666 psi | 60% | 2438 fps | 98.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,422 psi | 65% | 2500 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 33,214 psi | 53% | 2395 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,416 psi | 52% | 2405 fps | 96.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,429 psi | 49% | 2356 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,085 psi | 56% | 2526 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,947 psi | 70% | 2566 fps | 98.4% |
| Bofors RP3 | <<locked>> | 80% | 37,289 psi | 60% | 2441 fps | 98.7% |
| Bofors RP7 | <<locked>> | 90% | 46,122 psi | 74% | 2566 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,617 psi | 78% | 2556 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,716 psi | 73% | 2592 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,241 psi | 81% | 2726 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 80% | 38,087 psi | 61% | 2444 fps | 96.3% |
| Hodgdon H414 | <<locked>> | 90% | 42,859 psi | 69% | 2592 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 92% | 49,937 psi | 80% | 2667 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 45,107 psi | 72% | 2572 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,514 psi | 46% | 2247 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,089 psi | 66% | 2546 fps | 99.4% |
| Hodgdon Superformance | 71.3 gr | 92% | 45,890 psi | 74% | 2667 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,382 psi | 42% | 1470 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,250 psi | 69% | 2523 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 44,773 psi | 72% | 2562 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,016 psi | 64% | 2451 fps | 98.1% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,482 psi | 68% | 2470 fps | 95.1% |
| IMR 4350 | <<locked>> | 94% | 46,209 psi | 74% | 2589 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 88% | 45,194 psi | 72% | 2549 fps | 95.7% |
| IMR 4831 | <<locked>> | 86% | 33,924 psi | 54% | 2395 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 41,394 psi | 66% | 2530 fps | 98.8% |
| IMR 8208 XBR | <<locked>> | 80% | 46,775 psi | 75% | 2566 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 43,874 psi | 70% | 2543 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,773 psi | 72% | 2500 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 39,885 psi | 64% | 2454 fps | 99.3% |
| Lovex S065 | <<locked>> | 84% | 37,028 psi | 59% | 2395 fps | 95% |
| Lovex S070 | <<locked>> | 90% | 42,337 psi | 68% | 2523 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 43,845 psi | 70% | 2516 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 44,150 psi | 71% | 2523 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,784 psi | 64% | 2487 fps | 98.5% |
| Norma URP | <<locked>> | 84% | 33,214 psi | 53% | 2385 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 39,378 psi | 63% | 2503 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 39,262 psi | 63% | 2526 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 46,688 psi | 75% | 2575 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,108 psi | 74% | 2592 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,459 psi | 81% | 2615 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,803 psi | 43% | 1506 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,373 psi | 84% | 2641 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,104 psi | 66% | 2480 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 42,453 psi | 68% | 2595 fps | 98.6% |
| ReloadSwiss RS 60 | 58.6 gr | 80% | 34,505 psi | 55% | 2470 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,809 psi | 56% | 2451 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 37,347 psi | 60% | 2513 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 47,790 psi | 77% | 2552 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,727 psi | 67% | 2467 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 35,114 psi | 56% | 2388 fps | 98% |
| Rottweil R 907 | <<locked>> | 90% | 46,122 psi | 74% | 2566 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,028 psi | 59% | 2395 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,874 psi | 70% | 2543 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,885 psi | 64% | 2454 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 42,337 psi | 68% | 2523 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,984 psi | 58% | 2434 fps | 97.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,020 psi | 72% | 2549 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,120 psi | 69% | 2530 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,223 psi | 73% | 2470 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,637 psi | 60% | 2346 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 44,121 psi | 71% | 2493 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 50,662 psi | 81% | 2644 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,817 psi | 72% | 2470 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,788 psi | 72% | 2549 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 35,969 psi | 58% | 2395 fps | 98% |
| Somchem S365 | <<locked>> | 80% | 26,092 psi | 42% | 2231 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 51,039 psi | 82% | 2523 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,556 psi | 73% | 2461 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,292 psi | 66% | 2451 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,771 psi | 67% | 2461 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,156 psi | 55% | 2336 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 34,606 psi | 55% | 2388 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 46,847 psi | 75% | 2562 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 40,161 psi | 64% | 2451 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,084 psi | 55% | 2388 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 92% | 32,590 psi | 52% | 2425 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,356 psi | 49% | 2264 fps | 96.1% |
| Winchester 748 | <<locked>> | 80% | 46,499 psi | 75% | 2608 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 43,047 psi | 69% | 2595 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,631 psi | 46% | 2369 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,569 psi | 68% | 2533 fps | 99.3% |
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 | 215gr | Sierra GameKing. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,861 fps; across all powders the maximum-charge window runs from 1,644 fps to 2,861 fps. Alliant Reloder-16 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 56–90 %, leaving at least 10 % headroom. The 215.0 gr projectile in 0.338" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-16, Alliant Reloder-23, Alliant Reloder-26 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, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .338 Win Mag. with the .338 | 215gr | Sierra GameKing 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.