Load Specifications
Load data in caliber .338 Win Mag. with .338 | 225gr | Barnes MRX BT bullet and 102 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 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>> | 86% | 56,014 psi | 90% | 2552 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,491 psi | 87% | 2582 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,143 psi | 87% | 2575 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 52,779 psi | 85% | 2595 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 54,012 psi | 87% | 2582 fps | 97% |
| Accurate 4064 | <<locked>> | 92% | 54,128 psi | 87% | 2621 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,896 psi | 86% | 2700 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 88% | 55,216 psi | 89% | 2654 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 56,405 psi | 90% | 2654 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,404 psi | 87% | 2608 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 55,187 psi | 88% | 2585 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,839 psi | 88% | 2766 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,101 psi | 90% | 2674 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,811 psi | 89% | 2556 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 53,403 psi | 86% | 2648 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,301 psi | 84% | 2707 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 96% | 53,084 psi | 85% | 2740 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,767 psi | 59% | 2454 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,799 psi | 65% | 2595 fps | 97.4% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,245 psi | 89% | 2674 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 52,837 psi | 85% | 2638 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 53,577 psi | 86% | 2615 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,159 psi | 90% | 2592 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,432 psi | 86% | 2638 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,666 psi | 89% | 2733 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 55,085 psi | 88% | 2598 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,173 psi | 90% | 2628 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,114 psi | 87% | 2654 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 98% | 53,374 psi | 86% | 2700 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 96% | 54,476 psi | 87% | 2664 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 88% | 55,753 psi | 89% | 2664 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,196 psi | 77% | 2589 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,143 psi | 88% | 2697 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 54,360 psi | 87% | 2736 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,215 psi | 56% | 1585 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,621 psi | 86% | 2618 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,811 psi | 89% | 2644 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,869 psi | 90% | 2638 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,927 psi | 90% | 2621 fps | 98.1% |
| IMR 4198 | <<locked>> | 82% | 56,217 psi | 90% | 2516 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,505 psi | 86% | 2638 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,593 psi | 89% | 2644 fps | 98% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,865 psi | 82% | 2641 fps | 99.4% |
| IMR 4895 | <<locked>> | 90% | 54,766 psi | 88% | 2677 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 54,404 psi | 87% | 2608 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,259 psi | 87% | 2592 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,723 psi | 88% | 2631 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,216 psi | 89% | 2589 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 55,317 psi | 89% | 2631 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 54,389 psi | 87% | 2635 fps | 98.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,419 psi | 89% | 2667 fps | 98.3% |
| Norma 201 | <<locked>> | 88% | 53,940 psi | 86% | 2602 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,578 psi | 88% | 2605 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,956 psi | 90% | 2684 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 54,099 psi | 87% | 2680 fps | 96% |
| Norma URPᴾ | <<locked>> | 100% | 53,229 psi | 85% | 2694 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 90% | 52,823 psi | 85% | 2661 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,938 psi | 83% | 2684 fps | 98.4% |
| Ramshot TAC | <<locked>> | 86% | 54,810 psi | 88% | 2631 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,186 psi | 87% | 2648 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,274 psi | 89% | 2612 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,549 psi | 57% | 1621 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,853 psi | 86% | 2589 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,534 psi | 87% | 2638 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 53,534 psi | 86% | 2707 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 52,924 psi | 85% | 2740 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,461 psi | 86% | 2723 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,737 psi | 86% | 2753 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 86% | 54,824 psi | 88% | 2582 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,259 psi | 87% | 2598 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 56,217 psi | 90% | 2677 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 53,577 psi | 86% | 2615 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,389 psi | 87% | 2635 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,723 psi | 88% | 2631 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,317 psi | 89% | 2631 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,419 psi | 89% | 2667 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,694 psi | 88% | 2690 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 52,997 psi | 85% | 2608 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,635 psi | 86% | 2628 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,883 psi | 90% | 2546 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,782 psi | 89% | 2543 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,984 psi | 88% | 2595 fps | 97.9% |
| Somchem S321 | <<locked>> | 84% | 55,535 psi | 89% | 2641 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,984 psi | 88% | 2546 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 56,376 psi | 90% | 2651 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 53,417 psi | 86% | 2631 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,398 psi | 76% | 2641 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,622 psi | 89% | 2510 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,072 psi | 90% | 2533 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 53,998 psi | 87% | 2566 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,027 psi | 88% | 2585 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,737 psi | 88% | 2612 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,970 psi | 90% | 2687 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 86% | 54,853 psi | 88% | 2608 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 53,258 psi | 85% | 2585 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,679 psi | 88% | 2690 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,929 psi | 64% | 2523 fps | 98.3% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 52,779 psi | 85% | 2621 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 54,781 psi | 88% | 2654 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 53,635 psi | 86% | 2700 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,692 psi | 52% | 2441 fps | 97.9% |
| Winchester StaBALL Match | <<locked>> | 88% | 53,505 psi | 86% | 2638 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% | 46,456 psi | 74% | 2428 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,879 psi | 82% | 2533 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,696 psi | 62% | 2352 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,948 psi | 74% | 2497 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 47,456 psi | 76% | 2480 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 36,666 psi | 59% | 2349 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 32,793 psi | 53% | 2329 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 42,772 psi | 69% | 2457 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 36,492 psi | 59% | 2323 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,933 psi | 72% | 2467 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 45,049 psi | 72% | 2454 fps | 100% |
| Alliant Power Pro 2000-MR | 56.4 gr | 80% | 38,870 psi | 62% | 2487 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,897 psi | 58% | 2339 fps | 98.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,359 psi | 84% | 2513 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,522 psi | 62% | 2395 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,634 psi | 54% | 2346 fps | 95.6% |
| Alliant Reloder-17 | 55.5 gr | 80% | 30,792 psi | 49% | 2303 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,761 psi | 46% | 2251 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,462 psi | 57% | 2474 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,090 psi | 67% | 2464 fps | 98.2% |
| Bofors RP3 | <<locked>> | 80% | 35,186 psi | 56% | 2339 fps | 98.4% |
| Bofors RP7 | <<locked>> | 90% | 44,309 psi | 71% | 2464 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,760 psi | 75% | 2457 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,584 psi | 70% | 2487 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,196 psi | 77% | 2621 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 80% | 51,663 psi | 83% | 2556 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,547 psi | 84% | 2579 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,230 psi | 58% | 2343 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 90% | 40,901 psi | 66% | 2487 fps | 95% |
| Hodgdon H4350 | <<locked>> | 92% | 47,848 psi | 77% | 2562 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 43,192 psi | 69% | 2467 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,834 psi | 46% | 2201 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,189 psi | 63% | 2441 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 92% | 43,787 psi | 70% | 2559 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,063 psi | 42% | 1411 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,669 psi | 67% | 2428 fps | 99.2% |
| IMR 3031 | <<locked>> | 80% | 42,931 psi | 69% | 2464 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,276 psi | 61% | 2352 fps | 97.9% |
| IMR 4166 Enduron | <<locked>> | 82% | 43,526 psi | 70% | 2421 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 52,939 psi | 85% | 2477 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 44,411 psi | 71% | 2490 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 88% | 43,294 psi | 69% | 2448 fps | 95.4% |
| IMR 4831 | <<locked>> | 86% | 31,937 psi | 51% | 2290 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 39,465 psi | 63% | 2425 fps | 98.6% |
| IMR 8208 XBR | <<locked>> | 80% | 44,933 psi | 72% | 2467 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 50,676 psi | 81% | 2546 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,800 psi | 67% | 2441 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,149 psi | 69% | 2405 fps | 99.1% |
| Lovex S062 | <<locked>> | 80% | 37,985 psi | 61% | 2352 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 37,579 psi | 60% | 2349 fps | 95.4% |
| Lovex S070 | <<locked>> | 90% | 40,277 psi | 65% | 2421 fps | 95% |
| Norma 201 | <<locked>> | 80% | 41,872 psi | 67% | 2415 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 42,293 psi | 68% | 2425 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,869 psi | 61% | 2385 fps | 98.2% |
| Norma 204 | <<locked>> | 98% | 50,705 psi | 81% | 2631 fps | 95.3% |
| Norma URP | <<locked>> | 86% | 33,533 psi | 54% | 2336 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 37,492 psi | 60% | 2398 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 40,045 psi | 64% | 2477 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 44,889 psi | 72% | 2474 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,353 psi | 71% | 2493 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,573 psi | 78% | 2513 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,455 psi | 42% | 1450 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,560 psi | 81% | 2543 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,247 psi | 63% | 2379 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,524 psi | 65% | 2493 fps | 98.3% |
| ReloadSwiss RS 60 | 55.5 gr | 80% | 32,837 psi | 53% | 2365 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 35,128 psi | 56% | 2402 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 37,985 psi | 61% | 2464 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 45,658 psi | 73% | 2451 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,711 psi | 64% | 2369 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 33,156 psi | 53% | 2287 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 90% | 44,309 psi | 71% | 2464 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 86% | 37,579 psi | 60% | 2349 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,800 psi | 67% | 2441 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 37,985 psi | 61% | 2352 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 90% | 40,277 psi | 65% | 2421 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,316 psi | 55% | 2336 fps | 97.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,960 psi | 69% | 2448 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,466 psi | 66% | 2431 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,555 psi | 70% | 2372 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,056 psi | 58% | 2251 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 42,163 psi | 68% | 2395 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 48,602 psi | 78% | 2543 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 42,989 psi | 69% | 2375 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,844 psi | 69% | 2448 fps | 99% |
| Somchem S355 | <<locked>> | 80% | 34,127 psi | 55% | 2297 fps | 97.7% |
| Somchem S365 | <<locked>> | 82% | 26,194 psi | 42% | 2185 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 49,284 psi | 79% | 2428 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,903 psi | 70% | 2369 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,349 psi | 63% | 2356 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,030 psi | 64% | 2365 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,474 psi | 52% | 2238 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 84% | 32,895 psi | 53% | 2290 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 44,991 psi | 72% | 2464 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 38,435 psi | 62% | 2356 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 34,345 psi | 55% | 2336 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 92% | 30,603 psi | 49% | 2320 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,848 psi | 46% | 2169 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 44,527 psi | 71% | 2507 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 41,118 psi | 66% | 2490 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,747 psi | 46% | 2320 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,741 psi | 65% | 2434 fps | 99.2% |
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 118 powders for .338 Win Mag. loaded with the .338 | 225gr | Barnes MRX BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,766 fps; across all powders the maximum-charge window runs from 1,585 fps to 2,766 fps. Accurate 3100 gives the best case fill at 100 %, and 118 of the 118 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 50–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 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 Reloder-17, ReloadSwiss RS 60, Alliant Power Pro 2000-MR rank at the top here: for .338 Win Mag. with the .338 | 225gr | Barnes MRX BT they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, Alliant Reloder-19, Alliant Reloder-22 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.