Load Specifications
Bullet Manufacturer:Hornady
Bullet Weight:250 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338 Win Mag. load data
Case Length (l3):2.5"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:86 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:6.0
Load data in caliber .338 Win Mag. with .338 | 250gr | Hornady InterLock RN bullet and 104 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 Alliant Reloder-17.
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 2495 | <<locked>> | 84% | 54,230 psi | 87% | 2448 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 55,912 psi | 90% | 2513 fps | 98.8% |
| Accurate 3100ᴾ | <<locked>> | 100% | 48,457 psi | 78% | 2497 fps | 99.1% |
| Accurate 4064 | <<locked>> | 86% | 54,520 psi | 87% | 2497 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 54,520 psi | 87% | 2592 fps | 100% |
| ADI AR 2206H | <<locked>> | 82% | 53,969 psi | 87% | 2523 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 54,969 psi | 88% | 2526 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 55,767 psi | 89% | 2631 fps | 98.3% |
| ADI Benchmark 8208 | <<locked>> | 82% | 56,159 psi | 90% | 2516 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 53,766 psi | 86% | 2638 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 55,405 psi | 89% | 2546 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 55,767 psi | 89% | 2566 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 55,521 psi | 89% | 2644 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 52,953 psi | 85% | 2618 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 54,824 psi | 88% | 2618 fps | 98.2% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 48,211 psi | 77% | 2566 fps | 97.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 45,498 psi | 73% | 2513 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 39,972 psi | 64% | 2441 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 51,663 psi | 83% | 2684 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 53,563 psi | 86% | 2539 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 44,396 psi | 71% | 2497 fps | 96.1% |
| Bofors RP3 | <<locked>> | 88% | 56,173 psi | 90% | 2562 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 48,211 psi | 77% | 2566 fps | 97.2% |
| Bofors RP7 | <<locked>> | 92% | 55,811 psi | 89% | 2549 fps | 99% |
| Hodgdon BL-C2 | <<locked>> | 82% | 55,898 psi | 90% | 2549 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 53,374 psi | 86% | 2533 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 92% | 53,447 psi | 86% | 2592 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 90% | 53,766 psi | 86% | 2556 fps | 98.3% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 53,505 psi | 86% | 2572 fps | 96% |
| Hodgdon H4895 | <<locked>> | 82% | 54,534 psi | 87% | 2530 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 55,622 psi | 89% | 2572 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,418 psi | 87% | 2566 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 53,316 psi | 85% | 2625 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,143 psi | 58% | 1542 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 55,492 psi | 89% | 2530 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 54,940 psi | 88% | 2507 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 54,418 psi | 87% | 2510 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,940 psi | 86% | 2497 fps | 99.1% |
| IMR 4350 | <<locked>> | 94% | 52,895 psi | 85% | 2530 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,143 psi | 87% | 2526 fps | 99.1% |
| IMR 4831 | <<locked>> | 96% | 55,042 psi | 88% | 2585 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 53,780 psi | 86% | 2546 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 55,376 psi | 89% | 2566 fps | 96.6% |
| IMR 8208 XBR | <<locked>> | 82% | 56,159 psi | 90% | 2516 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 54,128 psi | 87% | 2500 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 56,391 psi | 90% | 2497 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 54,650 psi | 88% | 2507 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,041 psi | 87% | 2523 fps | 99.7% |
| Lovex S070 | <<locked>> | 94% | 55,042 psi | 88% | 2559 fps | 99.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 40,292 psi | 65% | 2362 fps | 97.7% |
| Norma 201 | <<locked>> | 84% | 56,101 psi | 90% | 2513 fps | 100% |
| Norma 202 | <<locked>> | 82% | 53,258 psi | 85% | 2467 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,013 psi | 88% | 2552 fps | 100% |
| Norma 204 | <<locked>> | 94% | 53,461 psi | 86% | 2575 fps | 97.8% |
| Norma MRPᴾ | <<locked>> | 100% | 51,140 psi | 82% | 2644 fps | 98.9% |
| Norma URP | <<locked>> | 94% | 53,476 psi | 86% | 2579 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 55,695 psi | 89% | 2579 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 55,782 psi | 89% | 2631 fps | 99.8% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 41,959 psi | 67% | 2438 fps | 96.1% |
| Ramshot TAC | <<locked>> | 82% | 56,289 psi | 90% | 2546 fps | 99.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 56,217 psi | 90% | 2559 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,840 psi | 59% | 1578 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 53,345 psi | 86% | 2520 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 53,084 psi | 85% | 2579 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 56,333 psi | 90% | 2661 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 54,230 psi | 87% | 2615 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 53,098 psi | 85% | 2641 fps | 100% |
| Rottweil R 902 | <<locked>> | 84% | 53,461 psi | 86% | 2474 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 56,246 psi | 90% | 2559 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 54,099 psi | 87% | 2552 fps | 96.9% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 53,751 psi | 86% | 2602 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 92% | 55,811 psi | 89% | 2549 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,041 psi | 87% | 2523 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,128 psi | 87% | 2500 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 54,650 psi | 88% | 2507 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 55,042 psi | 88% | 2559 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 54,244 psi | 87% | 2569 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 54,868 psi | 88% | 2526 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 55,869 psi | 90% | 2546 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 53,766 psi | 86% | 2408 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 54,476 psi | 87% | 2415 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 53,693 psi | 86% | 2480 fps | 99.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 53,258 psi | 85% | 2598 fps | 98.1% |
| Somchem S335 | <<locked>> | 82% | 53,345 psi | 86% | 2408 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 54,520 psi | 87% | 2513 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 56,304 psi | 90% | 2552 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 55,811 psi | 89% | 2549 fps | 96.4% |
| Somchem S365 | <<locked>> | 98% | 55,767 psi | 89% | 2628 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 54,433 psi | 87% | 2582 fps | 98.9% |
| Vihtavuori N133 | <<locked>> | 82% | 54,201 psi | 87% | 2392 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 53,577 psi | 86% | 2434 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 53,954 psi | 87% | 2451 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 54,201 psi | 87% | 2487 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 55,666 psi | 89% | 2572 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,079 psi | 75% | 2464 fps | 97.3% |
| Vihtavuori N540 | <<locked>> | 86% | 55,477 psi | 89% | 2493 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 54,781 psi | 88% | 2582 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 50,952 psi | 82% | 2582 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 51,764 psi | 83% | 2631 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 55,376 psi | 89% | 2549 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 53,621 psi | 86% | 2595 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 40,973 psi | 66% | 2559 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 55,927 psi | 90% | 2552 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 51,140 psi | 82% | 2530 fps | 97.5% |
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 2495 | <<locked>> | 80% | 47,688 psi | 76% | 2365 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 45,905 psi | 74% | 2362 fps | 97.2% |
| Accurate 3100 | <<locked>> | 88% | 32,372 psi | 52% | 2205 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 45,121 psi | 72% | 2369 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 33,939 psi | 54% | 2244 fps | 97.6% |
| ADI AR 2206H | <<locked>> | 80% | 50,749 psi | 81% | 2477 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,091 psi | 69% | 2346 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 43,047 psi | 69% | 2425 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 52,808 psi | 85% | 2474 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 46,862 psi | 75% | 2533 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,395 psi | 70% | 2369 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 46,296 psi | 74% | 2428 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,634 psi | 54% | 2254 fps | 97.7% |
| Alliant Reloder-17 | 59.6 gr | 80% | 37,753 psi | 61% | 2369 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 42,583 psi | 68% | 2421 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 96% | 42,453 psi | 68% | 2464 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 82% | 26,020 psi | 42% | 2087 fps | 96% |
| Alliant Reloder-25 | <<locked>> | 94% | 33,156 psi | 53% | 2283 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 84% | 29,486 psi | 47% | 2234 fps | 95.1% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 50,183 psi | 80% | 2490 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 41,684 psi | 67% | 2448 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 43,308 psi | 69% | 2379 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 42,453 psi | 68% | 2464 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 38,493 psi | 62% | 2260 fps | 95.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 52,344 psi | 84% | 2503 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 43,816 psi | 70% | 2385 fps | 99.2% |
| Hodgdon H414 | <<locked>> | 80% | 36,042 psi | 58% | 2287 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 82% | 41,626 psi | 67% | 2356 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 98% | 50,154 psi | 80% | 2523 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 51,271 psi | 82% | 2484 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,067 psi | 50% | 2162 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 47,558 psi | 76% | 2470 fps | 100% |
| Hodgdon Superformance | 64.5 gr | 82% | 37,420 psi | 60% | 2346 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,948 psi | 43% | 1375 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,023 psi | 79% | 2441 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 51,750 psi | 83% | 2464 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 45,310 psi | 73% | 2375 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,529 psi | 76% | 2398 fps | 98.2% |
| IMR 4350 | <<locked>> | 84% | 38,899 psi | 62% | 2293 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,929 psi | 64% | 2290 fps | 96.4% |
| IMR 4831 | <<locked>> | 80% | 32,779 psi | 53% | 2205 fps | 97.3% |
| IMR 4895 | <<locked>> | 80% | 47,485 psi | 76% | 2454 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 49,023 psi | 79% | 2470 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 52,808 psi | 85% | 2474 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 50,604 psi | 81% | 2454 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 49,937 psi | 80% | 2408 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 45,397 psi | 73% | 2372 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 37,391 psi | 60% | 2247 fps | 97.2% |
| Lovex S070 | <<locked>> | 80% | 35,723 psi | 57% | 2228 fps | 95.4% |
| Lovex S071 | <<locked>> | 94% | 33,330 psi | 53% | 2224 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 49,530 psi | 79% | 2425 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,270 psi | 81% | 2428 fps | 100% |
| Norma 203B | <<locked>> | 80% | 45,701 psi | 73% | 2418 fps | 100% |
| Norma 204 | <<locked>> | 88% | 43,758 psi | 70% | 2421 fps | 95.6% |
| Norma MRP | <<locked>> | 90% | 36,564 psi | 59% | 2372 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 34,069 psi | 55% | 2244 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 80% | 45,600 psi | 73% | 2434 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 80% | 32,924 psi | 53% | 2228 fps | 95.1% |
| Ramshot Magnum | <<locked>> | 98% | 39,102 psi | 63% | 2379 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 52,591 psi | 84% | 2497 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 52,678 psi | 84% | 2510 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,470 psi | 44% | 1407 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,034 psi | 71% | 2372 fps | 98.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 49,501 psi | 79% | 2530 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,147 psi | 64% | 2418 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,547 psi | 54% | 2260 fps | 97.1% |
| ReloadSwiss RS 70 | 60.5 gr | 80% | 33,054 psi | 53% | 2264 fps | 96.3% |
| Rottweil R 902 | <<locked>> | 80% | 47,210 psi | 76% | 2382 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 40,872 psi | 66% | 2333 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 94% | 47,703 psi | 76% | 2457 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 92% | 41,423 psi | 66% | 2402 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 38,493 psi | 62% | 2260 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,391 psi | 60% | 2247 fps | 97.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 50,604 psi | 81% | 2454 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 45,397 psi | 73% | 2372 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 35,723 psi | 57% | 2228 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 41,713 psi | 67% | 2375 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 51,329 psi | 82% | 2477 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,052 psi | 79% | 2451 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 50,676 psi | 81% | 2365 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 42,598 psi | 68% | 2254 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 36,637 psi | 59% | 2198 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 41,031 psi | 66% | 2398 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 50,227 psi | 81% | 2365 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,068 psi | 82% | 2467 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,234 psi | 66% | 2329 fps | 99.9% |
| Somchem S361 | <<locked>> | 96% | 52,301 psi | 84% | 2500 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 30,589 psi | 49% | 2205 fps | 99.3% |
| Somchem S385 | <<locked>> | 90% | 39,537 psi | 63% | 2343 fps | 95.8% |
| Vihtavuori N133 | <<locked>> | 80% | 51,155 psi | 82% | 2352 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 47,326 psi | 76% | 2352 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 47,645 psi | 76% | 2369 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 39,450 psi | 63% | 2270 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 35,404 psi | 57% | 2244 fps | 97.8% |
| Vihtavuori N165 | <<locked>> | 94% | 38,696 psi | 62% | 2316 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 45,818 psi | 73% | 2362 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 34,809 psi | 56% | 2244 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 80% | 26,498 psi | 42% | 2106 fps | 95.2% |
| Vihtavuori N560 | <<locked>> | 98% | 48,428 psi | 78% | 2575 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,679 psi | 56% | 2218 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 36,042 psi | 58% | 2287 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 84% | 24,497 psi | 39% | 2106 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 48,994 psi | 79% | 2457 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 41,568 psi | 67% | 2372 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 104 powders for .338 Win Mag. loaded with the .338 | 250gr | Hornady InterLock RN. Alliant Reloder-26 delivers the highest muzzle velocity at 2,684 fps; across all powders the maximum-charge window runs from 1,542 fps to 2,684 fps. Accurate 3100 gives the best case fill at 100 %, and 104 of the 104 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 250.0 gr projectile in 0.338" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-19 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, Alliant Reloder-17 rank at the top here: for .338 Win Mag. with the .338 | 250gr | Hornady InterLock RN 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.