Load Specifications
Load data in caliber .338 Win Mag. with .338 | 225gr | Barnes X S 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 70, 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>> | 82% | 55,245 psi | 89% | 2523 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 55,085 psi | 88% | 2559 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 53,882 psi | 86% | 2598 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,505 psi | 86% | 2549 fps | 97% |
| Accurate 3100ᴾ | <<locked>> | 100% | 45,890 psi | 74% | 2533 fps | 97.3% |
| Accurate 4064 | <<locked>> | 88% | 56,405 psi | 90% | 2612 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 54,911 psi | 88% | 2687 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 84% | 54,882 psi | 88% | 2625 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 55,419 psi | 89% | 2621 fps | 99.9% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,243 psi | 84% | 2651 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 82% | 53,708 psi | 86% | 2575 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,911 psi | 88% | 2552 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 53,679 psi | 86% | 2730 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 56,057 psi | 90% | 2651 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 53,403 psi | 86% | 2625 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,926 psi | 88% | 2726 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 94% | 56,043 psi | 90% | 2762 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 51,401 psi | 82% | 2644 fps | 95.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,076 psi | 69% | 2556 fps | 99.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,892 psi | 77% | 2710 fps | 99% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 54,070 psi | 87% | 2638 fps | 99.7% |
| Bofors RP3 | <<locked>> | 88% | 53,925 psi | 86% | 2625 fps | 100% |
| Bofors RP7 | <<locked>> | 92% | 53,432 psi | 86% | 2592 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 82% | 55,114 psi | 88% | 2556 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 55,564 psi | 89% | 2644 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,215 psi | 87% | 2631 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 92% | 54,766 psi | 88% | 2697 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 96% | 54,302 psi | 87% | 2648 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 84% | 55,390 psi | 89% | 2635 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,984 psi | 88% | 2661 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 53,345 psi | 86% | 2654 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 53,330 psi | 86% | 2703 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,216 psi | 58% | 1594 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,244 psi | 87% | 2612 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 54,259 psi | 87% | 2598 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 54,476 psi | 87% | 2598 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 53,780 psi | 86% | 2572 fps | 97.8% |
| IMR 4350 | <<locked>> | 98% | 56,333 psi | 90% | 2657 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 92% | 53,766 psi | 86% | 2605 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,330 psi | 84% | 2638 fps | 99.6% |
| IMR 4895 | <<locked>> | 86% | 54,650 psi | 88% | 2651 fps | 100% |
| IMR 8208 XBR | <<locked>> | 82% | 53,708 psi | 86% | 2575 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 55,143 psi | 88% | 2608 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,128 psi | 87% | 2552 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 55,608 psi | 89% | 2608 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 54,839 psi | 88% | 2618 fps | 99% |
| Lovex S070 | <<locked>> | 96% | 55,651 psi | 89% | 2651 fps | 98.4% |
| Norma 201 | <<locked>> | 84% | 54,389 psi | 87% | 2579 fps | 100% |
| Norma 202 | <<locked>> | 84% | 54,375 psi | 87% | 2575 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,738 psi | 89% | 2657 fps | 100% |
| Norma 204 | <<locked>> | 96% | 53,388 psi | 86% | 2654 fps | 96% |
| Norma MRPᴾ | <<locked>> | 100% | 47,747 psi | 77% | 2664 fps | 96.6% |
| Norma URP | <<locked>> | 96% | 53,359 psi | 86% | 2671 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 88% | 55,825 psi | 90% | 2680 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 55,187 psi | 88% | 2713 fps | 98.9% |
| Ramshot TAC | <<locked>> | 82% | 53,679 psi | 86% | 2592 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 82% | 53,534 psi | 86% | 2615 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,999 psi | 59% | 1634 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,085 psi | 87% | 2608 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 53,417 psi | 86% | 2680 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,869 psi | 90% | 2759 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 53,911 psi | 86% | 2703 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 56,333 psi | 90% | 2772 fps | 99.6% |
| Rottweil R 901 | <<locked>> | 82% | 55,869 psi | 90% | 2562 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 54,882 psi | 88% | 2579 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 53,795 psi | 86% | 2618 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 50,314 psi | 81% | 2631 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 92% | 53,432 psi | 86% | 2592 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 54,839 psi | 88% | 2618 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 84% | 55,143 psi | 88% | 2608 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 55,608 psi | 89% | 2608 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 54,505 psi | 87% | 2638 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 54,201 psi | 87% | 2664 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 56,043 psi | 90% | 2628 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,171 psi | 85% | 2598 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 55,143 psi | 88% | 2516 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 55,071 psi | 88% | 2513 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 54,752 psi | 88% | 2569 fps | 97.9% |
| Somchem S335 | <<locked>> | 84% | 54,824 psi | 88% | 2516 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 55,201 psi | 89% | 2615 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 53,708 psi | 86% | 2612 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,665 psi | 88% | 2720 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 51,184 psi | 82% | 2615 fps | 96.9% |
| Unknown powder | <<locked>> | 94% | 54,041 psi | 87% | 2671 fps | 99.3% |
| Vihtavuori N133 | <<locked>> | 86% | 54,752 psi | 88% | 2497 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,200 psi | 85% | 2536 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 53,824 psi | 86% | 2546 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,636 psi | 88% | 2592 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 54,534 psi | 87% | 2644 fps | 99.6% |
| Vihtavuori N540 | <<locked>> | 86% | 53,664 psi | 86% | 2575 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,114 psi | 88% | 2694 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 47,703 psi | 76% | 2631 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,303 psi | 89% | 2638 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,766 psi | 88% | 2697 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,117 psi | 63% | 2582 fps | 99.7% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,866 psi | 85% | 2628 fps | 95.9% |
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% | 52,098 psi | 84% | 2480 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 46,137 psi | 74% | 2434 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,618 psi | 81% | 2552 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 47,326 psi | 76% | 2454 fps | 95.7% |
| Accurate 3100 | <<locked>> | 94% | 38,101 psi | 61% | 2392 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 45,063 psi | 72% | 2448 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,460 psi | 54% | 2300 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 48,791 psi | 78% | 2533 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 41,742 psi | 67% | 2398 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 98% | 49,327 psi | 79% | 2602 fps | 95% |
| ADI Benchmark 8208 | <<locked>> | 80% | 50,546 psi | 81% | 2530 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 51,648 psi | 83% | 2513 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 44,353 psi | 71% | 2572 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 42,018 psi | 67% | 2428 fps | 99.5% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,657 psi | 72% | 2480 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,982 psi | 53% | 2297 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,535 psi | 59% | 2411 fps | 98.4% |
| Alliant Reloder-19 | <<locked>> | 98% | 48,327 psi | 77% | 2595 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 86% | 29,370 psi | 47% | 2231 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 90% | 35,143 psi | 56% | 2438 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,747 psi | 77% | 2536 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 42,250 psi | 68% | 2438 fps | 99.6% |
| Bofors RP7 | <<locked>> | 86% | 44,991 psi | 72% | 2451 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 52,112 psi | 84% | 2513 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,907 psi | 78% | 2549 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,598 psi | 68% | 2438 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 84% | 42,583 psi | 68% | 2493 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 92% | 48,443 psi | 78% | 2556 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 49,211 psi | 79% | 2539 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,821 psi | 49% | 2215 fps | 96.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,179 psi | 71% | 2510 fps | 99.8% |
| Hodgdon Superformance | 65.5 gr | 88% | 43,787 psi | 70% | 2536 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,253 psi | 44% | 1424 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,960 psi | 69% | 2431 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 45,484 psi | 73% | 2474 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,292 psi | 66% | 2379 fps | 98.6% |
| IMR 4166 Enduron | <<locked>> | 82% | 43,033 psi | 69% | 2388 fps | 95.5% |
| IMR 4350 | <<locked>> | 90% | 44,628 psi | 72% | 2470 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,525 psi | 68% | 2415 fps | 95.2% |
| IMR 4831 | <<locked>> | 84% | 33,199 psi | 53% | 2280 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 45,701 psi | 73% | 2510 fps | 99.5% |
| IMR 8208 XBR | <<locked>> | 80% | 50,546 psi | 81% | 2530 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,950 psi | 78% | 2520 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,341 psi | 78% | 2464 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 44,396 psi | 71% | 2438 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 37,086 psi | 59% | 2300 fps | 95.3% |
| Lovex S070 | <<locked>> | 86% | 41,785 psi | 67% | 2418 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 48,559 psi | 78% | 2493 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,486 psi | 78% | 2493 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,092 psi | 71% | 2470 fps | 99.3% |
| Norma 204 | <<locked>> | 94% | 50,140 psi | 80% | 2602 fps | 95.2% |
| Norma MRP | <<locked>> | 96% | 42,250 psi | 68% | 2559 fps | 95% |
| Norma URP | <<locked>> | 80% | 33,330 psi | 53% | 2293 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 43,323 psi | 69% | 2484 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 38,696 psi | 62% | 2421 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 50,386 psi | 81% | 2543 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 50,169 psi | 80% | 2562 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,847 psi | 45% | 1463 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,656 psi | 68% | 2415 fps | 96.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,036 psi | 75% | 2579 fps | 99.4% |
| ReloadSwiss RS 60 | 56.4 gr | 80% | 38,595 psi | 62% | 2467 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 34,766 psi | 56% | 2356 fps | 95.7% |
| ReloadSwiss RS 70 | 60.1 gr | 84% | 36,593 psi | 59% | 2405 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 53,055 psi | 85% | 2523 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 46,398 psi | 74% | 2451 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 40,118 psi | 64% | 2392 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 98% | 47,239 psi | 76% | 2579 fps | 95% |
| Rottweil R 907 | <<locked>> | 86% | 44,991 psi | 72% | 2451 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,086 psi | 59% | 2300 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,950 psi | 78% | 2520 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,396 psi | 71% | 2438 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 40,669 psi | 65% | 2402 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,074 psi | 64% | 2425 fps | 98.6% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,588 psi | 80% | 2530 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,181 psi | 76% | 2503 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,023 psi | 79% | 2431 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,321 psi | 66% | 2316 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 43,149 psi | 69% | 2382 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 49,110 psi | 79% | 2438 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 48,718 psi | 78% | 2520 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 40,495 psi | 65% | 2388 fps | 99.1% |
| Somchem S365 | <<locked>> | 80% | 30,255 psi | 49% | 2257 fps | 97.8% |
| Somchem S385 | <<locked>> | 96% | 45,513 psi | 73% | 2523 fps | 95.5% |
| Unknown powder | <<locked>> | 80% | 35,592 psi | 57% | 2336 fps | 95.5% |
| Vihtavuori N133 | <<locked>> | 80% | 46,427 psi | 74% | 2382 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,672 psi | 72% | 2415 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 45,339 psi | 73% | 2425 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,954 psi | 56% | 2257 fps | 99% |
| Vihtavuori N160 | <<locked>> | 80% | 35,621 psi | 57% | 2313 fps | 96.2% |
| Vihtavuori N540 | <<locked>> | 80% | 44,947 psi | 72% | 2444 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,289 psi | 58% | 2359 fps | 96.3% |
| Vihtavuori N555 | <<locked>> | 86% | 31,633 psi | 51% | 2303 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,953 psi | 54% | 2264 fps | 97.8% |
| Winchester 760 | <<locked>> | 84% | 42,583 psi | 68% | 2493 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 90% | 29,399 psi | 47% | 2306 fps | 96% |
| Winchester Supreme 780 | <<locked>> | 98% | 49,588 psi | 80% | 2575 fps | 95.1% |
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 Win Mag. loaded with the .338 | 225gr | Barnes X S. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,772 fps; across all powders the maximum-charge window runs from 1,594 fps to 2,772 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 (430 MPa), the top charges use 58–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, 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, Hodgdon Superformance, ReloadSwiss RS 60 rank at the top here: for .338 Win Mag. with the .338 | 225gr | Barnes X S they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2213, Alliant Reloder-22, Bofors RP15 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.