Load Specifications
Bullet Manufacturer:Lapua
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:1:13.5
Load data in caliber .338 Win Mag. with .338 | 250gr | Lapua Lock Base bullet and 103 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 2015 | <<locked>> | 82% | 54,969 psi | 88% | 2395 fps | 100% |
| Accurate 2495 | <<locked>> | 86% | 54,012 psi | 87% | 2425 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 55,317 psi | 89% | 2484 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 56,173 psi | 90% | 2487 fps | 98.5% |
| Accurate 3100ᴾ | <<locked>> | 100% | 44,266 psi | 71% | 2411 fps | 98.1% |
| Accurate 4064 | <<locked>> | 88% | 54,157 psi | 87% | 2474 fps | 100% |
| Accurate 4350 | <<locked>> | 96% | 53,925 psi | 86% | 2562 fps | 100% |
| ADI AR 2206H | <<locked>> | 84% | 54,056 psi | 87% | 2500 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 54,969 psi | 88% | 2500 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 52,054 psi | 83% | 2546 fps | 97.1% |
| ADI Benchmark 8208 | <<locked>> | 84% | 56,362 psi | 90% | 2497 fps | 100% |
| Alliant AR-Comp | <<locked>> | 82% | 54,201 psi | 87% | 2425 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 53,780 psi | 86% | 2615 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 55,259 psi | 89% | 2523 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 55,898 psi | 90% | 2543 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 54,897 psi | 88% | 2612 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 56,144 psi | 90% | 2641 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 50,879 psi | 82% | 2533 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,076 psi | 67% | 2438 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,130 psi | 60% | 2352 fps | 96.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 47,123 psi | 76% | 2592 fps | 99.7% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 53,853 psi | 86% | 2520 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 55,883 psi | 90% | 2536 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 55,811 psi | 89% | 2520 fps | 98.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 54,694 psi | 88% | 2434 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 56,115 psi | 90% | 2530 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 53,113 psi | 85% | 2507 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 96% | 56,434 psi | 90% | 2608 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 92% | 53,563 psi | 86% | 2523 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 84% | 54,607 psi | 88% | 2507 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 54,926 psi | 88% | 2543 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 54,259 psi | 87% | 2543 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 52,953 psi | 85% | 2592 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,998 psi | 58% | 1512 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 55,869 psi | 90% | 2510 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 54,839 psi | 88% | 2484 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 54,766 psi | 88% | 2490 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 54,331 psi | 87% | 2470 fps | 98.8% |
| IMR 4350 | <<locked>> | 98% | 56,260 psi | 90% | 2549 fps | 98.8% |
| IMR 4451 Enduron | <<locked>> | 92% | 54,244 psi | 87% | 2500 fps | 98.8% |
| IMR 4831 | <<locked>> | 98% | 54,433 psi | 87% | 2552 fps | 100% |
| IMR 4895 | <<locked>> | 86% | 53,664 psi | 86% | 2523 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 56,362 psi | 90% | 2497 fps | 100% |
| Lovex D073.6 | <<locked>> | 84% | 53,954 psi | 87% | 2477 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 53,490 psi | 86% | 2434 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 54,636 psi | 88% | 2484 fps | 100% |
| Lovex S065 | <<locked>> | 94% | 53,809 psi | 86% | 2497 fps | 99.5% |
| Lovex S070 | <<locked>> | 96% | 54,766 psi | 88% | 2530 fps | 99.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 36,840 psi | 59% | 2280 fps | 96.3% |
| Norma 201 | <<locked>> | 86% | 56,289 psi | 90% | 2493 fps | 100% |
| Norma 202 | <<locked>> | 84% | 53,461 psi | 86% | 2448 fps | 100% |
| Norma 203B | <<locked>> | 88% | 55,100 psi | 88% | 2533 fps | 100% |
| Norma 204 | <<locked>> | 96% | 53,229 psi | 85% | 2546 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 46,963 psi | 75% | 2549 fps | 97.8% |
| Norma URP | <<locked>> | 98% | 56,362 psi | 90% | 2595 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 55,622 psi | 89% | 2556 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 55,013 psi | 88% | 2595 fps | 99.5% |
| Ramshot TAC | <<locked>> | 82% | 52,910 psi | 85% | 2474 fps | 99.5% |
| Ramshot Wild Boar | <<locked>> | 84% | 56,289 psi | 90% | 2536 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,477 psi | 58% | 1549 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 53,359 psi | 86% | 2493 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 52,779 psi | 85% | 2552 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 55,854 psi | 90% | 2635 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 53,417 psi | 86% | 2582 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 56,260 psi | 90% | 2657 fps | 100% |
| Rottweil R 901 | <<locked>> | 82% | 54,070 psi | 87% | 2428 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 53,490 psi | 86% | 2451 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 56,043 psi | 90% | 2533 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 53,795 psi | 86% | 2520 fps | 96.3% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 49,647 psi | 80% | 2516 fps | 97% |
| Rottweil R 907 | <<locked>> | 94% | 55,811 psi | 89% | 2520 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 94% | 53,809 psi | 86% | 2497 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 84% | 53,954 psi | 87% | 2477 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 54,636 psi | 88% | 2484 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 54,766 psi | 88% | 2530 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 90% | 53,838 psi | 86% | 2539 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 55,230 psi | 89% | 2507 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 55,898 psi | 90% | 2523 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 54,259 psi | 87% | 2388 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 54,665 psi | 88% | 2392 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 53,867 psi | 86% | 2454 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 49,168 psi | 79% | 2513 fps | 96.9% |
| Somchem S335 | <<locked>> | 84% | 53,679 psi | 86% | 2388 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 54,911 psi | 88% | 2493 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 56,086 psi | 90% | 2526 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 54,636 psi | 88% | 2595 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 50,575 psi | 81% | 2503 fps | 97.9% |
| Vihtavuori N133 | <<locked>> | 84% | 54,621 psi | 88% | 2375 fps | 100% |
| Vihtavuori N135 | <<locked>> | 86% | 53,330 psi | 86% | 2411 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 53,911 psi | 86% | 2431 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 54,085 psi | 87% | 2464 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 55,361 psi | 89% | 2546 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 43,468 psi | 70% | 2379 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 82% | 53,447 psi | 86% | 2451 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 55,361 psi | 89% | 2470 fps | 100% |
| Vihtavuori N550 | <<locked>> | 96% | 54,346 psi | 87% | 2552 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 46,557 psi | 75% | 2500 fps | 99.9% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 55,100 psi | 88% | 2523 fps | 100% |
| Winchester 748 | <<locked>> | 82% | 53,417 psi | 86% | 2493 fps | 100% |
| Winchester 760 | <<locked>> | 94% | 53,011 psi | 85% | 2559 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,666 psi | 60% | 2464 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 55,767 psi | 89% | 2530 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 47,210 psi | 76% | 2441 fps | 96% |
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% | 51,880 psi | 83% | 2359 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 44,556 psi | 71% | 2303 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 51,721 psi | 83% | 2438 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,395 psi | 70% | 2293 fps | 96.1% |
| Accurate 3100 | <<locked>> | 92% | 33,794 psi | 54% | 2218 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 42,192 psi | 68% | 2306 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 31,299 psi | 50% | 2172 fps | 96.3% |
| ADI AR 2206H | <<locked>> | 80% | 47,877 psi | 77% | 2411 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 40,640 psi | 65% | 2280 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 96% | 45,672 psi | 73% | 2444 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 49,937 psi | 80% | 2411 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 50,749 psi | 81% | 2382 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 43,627 psi | 70% | 2454 fps | 99.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,538 psi | 65% | 2300 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 43,497 psi | 70% | 2359 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,546 psi | 51% | 2182 fps | 96.4% |
| Alliant Reloder-17 | 55.7 gr | 80% | 35,114 psi | 56% | 2293 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 96% | 45,005 psi | 72% | 2438 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 84% | 25,788 psi | 41% | 2057 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 98% | 34,925 psi | 56% | 2303 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 88% | 31,067 psi | 50% | 2257 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 47,050 psi | 75% | 2421 fps | 99.6% |
| Bofors RP3 | <<locked>> | 80% | 40,292 psi | 65% | 2306 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 41,031 psi | 66% | 2287 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 51,532 psi | 83% | 2392 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 48,965 psi | 79% | 2434 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 40,988 psi | 66% | 2313 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 38,189 psi | 61% | 2313 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 84% | 41,553 psi | 67% | 2329 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 48,341 psi | 78% | 2418 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,935 psi | 46% | 2090 fps | 97.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 44,353 psi | 71% | 2402 fps | 100% |
| Hodgdon Superformance | 63.2 gr | 86% | 39,987 psi | 64% | 2372 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,818 psi | 43% | 1348 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 46,224 psi | 74% | 2375 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 48,414 psi | 78% | 2402 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 42,714 psi | 68% | 2310 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 45,121 psi | 72% | 2329 fps | 97.3% |
| IMR 4350 | <<locked>> | 86% | 38,682 psi | 62% | 2267 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 37,594 psi | 60% | 2221 fps | 95.1% |
| IMR 4831 | <<locked>> | 80% | 30,356 psi | 49% | 2133 fps | 95.9% |
| IMR 4895 | <<locked>> | 80% | 44,585 psi | 71% | 2385 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 80% | 49,937 psi | 80% | 2411 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 47,340 psi | 76% | 2388 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 47,398 psi | 76% | 2346 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 42,699 psi | 68% | 2310 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 35,157 psi | 56% | 2178 fps | 96% |
| Lovex S070 | <<locked>> | 84% | 37,797 psi | 61% | 2251 fps | 95.7% |
| Lovex S071 | <<locked>> | 98% | 34,679 psi | 56% | 2238 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 46,789 psi | 75% | 2362 fps | 100% |
| Norma 202 | <<locked>> | 80% | 47,239 psi | 76% | 2365 fps | 100% |
| Norma 203B | <<locked>> | 80% | 42,873 psi | 69% | 2349 fps | 99.7% |
| Norma 204 | <<locked>> | 90% | 43,482 psi | 70% | 2388 fps | 95% |
| Norma MRP | <<locked>> | 94% | 38,537 psi | 62% | 2392 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 31,604 psi | 51% | 2172 fps | 96.2% |
| Ramshot Big Game | <<locked>> | 80% | 42,409 psi | 68% | 2362 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 34,911 psi | 56% | 2254 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 49,647 psi | 80% | 2425 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 49,429 psi | 79% | 2441 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,137 psi | 44% | 1381 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 41,307 psi | 66% | 2300 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 46,151 psi | 74% | 2457 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,376 psi | 60% | 2346 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 30,908 psi | 50% | 2185 fps | 95.7% |
| ReloadSwiss RS 70 | 57.9 gr | 82% | 32,895 psi | 53% | 2234 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 50,865 psi | 82% | 2388 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 44,672 psi | 72% | 2323 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 38,029 psi | 61% | 2260 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 98% | 50,517 psi | 81% | 2470 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 96% | 43,656 psi | 70% | 2421 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 84% | 41,031 psi | 66% | 2287 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,157 psi | 56% | 2178 fps | 96% |
| Shooters World Match Rifle | <<locked>> | 80% | 47,340 psi | 76% | 2388 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 42,699 psi | 68% | 2310 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 37,797 psi | 61% | 2251 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,928 psi | 62% | 2306 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 48,167 psi | 77% | 2405 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 46,253 psi | 74% | 2385 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 48,066 psi | 77% | 2310 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,219 psi | 64% | 2198 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 36,593 psi | 59% | 2175 fps | 95% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 43,250 psi | 69% | 2415 fps | 95.4% |
| Somchem S335 | <<locked>> | 80% | 47,616 psi | 76% | 2310 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 47,935 psi | 77% | 2402 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 38,667 psi | 62% | 2264 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 28,326 psi | 45% | 2133 fps | 98.3% |
| Somchem S385 | <<locked>> | 92% | 38,957 psi | 62% | 2310 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 48,472 psi | 78% | 2297 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 44,425 psi | 71% | 2297 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 44,773 psi | 72% | 2306 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 36,854 psi | 59% | 2205 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 32,938 psi | 53% | 2172 fps | 96.6% |
| Vihtavuori N165 | <<locked>> | 98% | 40,828 psi | 65% | 2333 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 49,951 psi | 80% | 2405 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 43,033 psi | 69% | 2303 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 32,358 psi | 52% | 2172 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 84% | 27,659 psi | 44% | 2123 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,460 psi | 52% | 2149 fps | 98.5% |
| Winchester 748 | <<locked>> | 80% | 49,922 psi | 80% | 2448 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 38,189 psi | 61% | 2313 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 25,744 psi | 41% | 2126 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 45,716 psi | 73% | 2388 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 44,237 psi | 71% | 2392 fps | 95.3% |
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 103 powders for .338 Win Mag. loaded with the .338 | 250gr | Lapua Lock Base. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,657 fps; across all powders the maximum-charge window runs from 1,512 fps to 2,657 fps. Accurate 3100 gives the best case fill at 100 %, and 103 of the 103 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 1:13.5 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 | Lapua Lock Base 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.