Load Specifications
Bullet Manufacturer:Sierra
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:1:12.5
Load data in caliber .338 Win Mag. with .338 | 250gr | Sierra MatchKing 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 Winchester 760.
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% | 53,345 psi | 86% | 2365 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,492 psi | 89% | 2434 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 53,635 psi | 86% | 2451 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,418 psi | 87% | 2448 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,453 psi | 68% | 2369 fps | 97.6% |
| Accurate 4064 | <<locked>> | 90% | 55,608 psi | 89% | 2480 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,347 psi | 89% | 2566 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 55,811 psi | 89% | 2510 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 53,534 psi | 86% | 2467 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 50,140 psi | 80% | 2500 fps | 96.4% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,752 psi | 88% | 2461 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,738 psi | 89% | 2431 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,303 psi | 89% | 2621 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 53,461 psi | 86% | 2487 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,099 psi | 87% | 2507 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,347 psi | 90% | 2615 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,070 psi | 87% | 2602 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 49,197 psi | 79% | 2493 fps | 96.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,495 psi | 65% | 2395 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,179 psi | 72% | 2543 fps | 99.3% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,593 psi | 89% | 2530 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 54,070 psi | 87% | 2500 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,056 psi | 87% | 2480 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 82% | 53,113 psi | 85% | 2402 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,041 psi | 87% | 2490 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,275 psi | 90% | 2585 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 54,868 psi | 88% | 2516 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 96% | 54,404 psi | 87% | 2566 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 94% | 55,187 psi | 88% | 2533 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 86% | 56,434 psi | 90% | 2516 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,750 psi | 85% | 2503 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,941 psi | 90% | 2549 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,839 psi | 88% | 2602 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,781 psi | 57% | 1496 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,056 psi | 87% | 2474 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 53,156 psi | 85% | 2454 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,391 psi | 90% | 2497 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,115 psi | 90% | 2480 fps | 98.9% |
| IMR 4350 | <<locked>> | 98% | 54,143 psi | 87% | 2503 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,912 psi | 90% | 2507 fps | 98.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,579 psi | 89% | 2556 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 55,492 psi | 89% | 2533 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,752 psi | 88% | 2461 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,782 psi | 89% | 2487 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,274 psi | 89% | 2441 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,217 psi | 90% | 2490 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,390 psi | 89% | 2503 fps | 99.6% |
| Lovex S070 | <<locked>> | 98% | 56,231 psi | 90% | 2536 fps | 99.1% |
| Norma 201 | <<locked>> | 86% | 54,592 psi | 88% | 2457 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,172 psi | 88% | 2457 fps | 100% |
| Norma 203B | <<locked>> | 88% | 53,316 psi | 85% | 2497 fps | 100% |
| Norma 204 | <<locked>> | 98% | 54,708 psi | 88% | 2549 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 44,962 psi | 72% | 2500 fps | 97.1% |
| Norma URP | <<locked>> | 98% | 54,244 psi | 87% | 2556 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 53,461 psi | 86% | 2516 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,391 psi | 90% | 2602 fps | 99.5% |
| Ramshot TAC | <<locked>> | 84% | 54,810 psi | 88% | 2487 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,592 psi | 88% | 2500 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,564 psi | 89% | 2467 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,274 psi | 58% | 1532 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,187 psi | 88% | 2500 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,520 psi | 87% | 2566 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,708 psi | 86% | 2595 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,868 psi | 88% | 2589 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,360 psi | 87% | 2615 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 84% | 55,593 psi | 89% | 2434 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 54,969 psi | 88% | 2454 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 53,925 psi | 86% | 2493 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 47,848 psi | 77% | 2474 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 94% | 54,056 psi | 87% | 2480 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,390 psi | 89% | 2503 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,782 psi | 89% | 2487 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,217 psi | 90% | 2490 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,231 psi | 90% | 2536 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,390 psi | 89% | 2549 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,330 psi | 86% | 2467 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,201 psi | 87% | 2487 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,043 psi | 90% | 2398 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,144 psi | 90% | 2395 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,448 psi | 89% | 2457 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 47,398 psi | 76% | 2470 fps | 96.2% |
| Somchem S321 | <<locked>> | 82% | 55,869 psi | 90% | 2490 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,434 psi | 89% | 2398 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 52,997 psi | 85% | 2457 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,085 psi | 87% | 2490 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,141 psi | 84% | 2552 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,341 psi | 78% | 2457 fps | 97.3% |
| Vihtavuori N130 | <<locked>> | 82% | 55,854 psi | 90% | 2359 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,333 psi | 90% | 2382 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,955 psi | 88% | 2421 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,724 psi | 89% | 2438 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,695 psi | 89% | 2470 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 53,272 psi | 85% | 2507 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 84% | 55,230 psi | 89% | 2461 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 53,751 psi | 86% | 2438 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,579 psi | 89% | 2556 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,483 psi | 71% | 2461 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 53,258 psi | 85% | 2484 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,187 psi | 88% | 2507 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,679 psi | 88% | 2569 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,042 psi | 58% | 2408 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,056 psi | 87% | 2493 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% | 50,241 psi | 81% | 2326 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,960 psi | 69% | 2270 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,053 psi | 80% | 2405 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,090 psi | 67% | 2257 fps | 95.4% |
| Accurate 3100 | <<locked>> | 94% | 34,519 psi | 55% | 2224 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 40,640 psi | 65% | 2274 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 29,849 psi | 48% | 2129 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 46,253 psi | 74% | 2372 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 39,334 psi | 63% | 2244 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 98% | 46,978 psi | 75% | 2448 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,298 psi | 77% | 2375 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,153 psi | 79% | 2352 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,221 psi | 68% | 2415 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,146 psi | 63% | 2267 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,901 psi | 67% | 2320 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,458 psi | 49% | 2142 fps | 95.6% |
| Alliant Reloder-17 | 53.7 gr | 80% | 33,692 psi | 54% | 2247 fps | 98.6% |
| Alliant Reloder-19 | <<locked>> | 98% | 46,151 psi | 74% | 2444 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 86% | 26,440 psi | 42% | 2067 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 90% | 31,981 psi | 51% | 2267 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,426 psi | 73% | 2382 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 38,885 psi | 62% | 2274 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 39,726 psi | 64% | 2247 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,140 psi | 80% | 2362 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,398 psi | 76% | 2402 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,489 psi | 84% | 2533 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,726 psi | 64% | 2277 fps | 98% |
| Hodgdon H414 | <<locked>> | 86% | 39,146 psi | 63% | 2320 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 86% | 42,859 psi | 69% | 2339 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 46,673 psi | 75% | 2382 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,978 psi | 45% | 2057 fps | 96.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,772 psi | 69% | 2362 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 41,394 psi | 66% | 2385 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,716 psi | 43% | 1335 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,889 psi | 72% | 2339 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 46,659 psi | 75% | 2369 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,336 psi | 66% | 2270 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,685 psi | 70% | 2293 fps | 96.7% |
| IMR 4350 | <<locked>> | 88% | 39,900 psi | 64% | 2277 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 82% | 38,841 psi | 62% | 2231 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 29,138 psi | 47% | 2096 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 42,946 psi | 69% | 2346 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 48,298 psi | 77% | 2375 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,672 psi | 73% | 2352 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,079 psi | 74% | 2313 fps | 99.8% |
| Lovex S062 | <<locked>> | 80% | 41,278 psi | 66% | 2274 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 33,997 psi | 55% | 2142 fps | 95.3% |
| Lovex S070 | <<locked>> | 86% | 38,885 psi | 62% | 2260 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 45,339 psi | 73% | 2326 fps | 100% |
| Norma 202 | <<locked>> | 80% | 45,745 psi | 73% | 2333 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,278 psi | 66% | 2310 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 44,744 psi | 72% | 2398 fps | 95% |
| Norma MRP | <<locked>> | 96% | 39,552 psi | 63% | 2398 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 30,400 psi | 49% | 2133 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 40,973 psi | 66% | 2326 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 35,969 psi | 58% | 2264 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 48,327 psi | 77% | 2392 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,718 psi | 77% | 2405 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,054 psi | 83% | 2421 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,035 psi | 43% | 1365 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,972 psi | 64% | 2260 fps | 96.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,411 psi | 71% | 2418 fps | 99.6% |
| ReloadSwiss RS 60 | 53.7 gr | 80% | 35,868 psi | 58% | 2303 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 31,705 psi | 51% | 2192 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 33,953 psi | 54% | 2247 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 49,487 psi | 79% | 2356 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,236 psi | 69% | 2287 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 36,666 psi | 59% | 2224 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 98% | 44,759 psi | 72% | 2425 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 84% | 39,726 psi | 64% | 2247 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 33,997 psi | 55% | 2142 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,672 psi | 73% | 2352 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,278 psi | 66% | 2274 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 38,885 psi | 62% | 2260 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,463 psi | 60% | 2267 fps | 98.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,702 psi | 75% | 2372 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,744 psi | 72% | 2349 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,775 psi | 75% | 2280 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,059 psi | 63% | 2165 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 37,695 psi | 60% | 2185 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 44,353 psi | 71% | 2421 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 52,243 psi | 84% | 2444 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,224 psi | 74% | 2277 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,224 psi | 74% | 2362 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 37,362 psi | 60% | 2228 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 27,296 psi | 44% | 2093 fps | 97.7% |
| Somchem S385 | <<locked>> | 94% | 39,958 psi | 64% | 2316 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 52,678 psi | 84% | 2323 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,166 psi | 76% | 2270 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,975 psi | 69% | 2264 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,381 psi | 70% | 2277 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,592 psi | 57% | 2172 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 31,618 psi | 51% | 2133 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 48,544 psi | 78% | 2372 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,800 psi | 67% | 2270 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 31,241 psi | 50% | 2136 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 86% | 28,282 psi | 45% | 2133 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,343 psi | 50% | 2113 fps | 97.9% |
| Winchester 748 | <<locked>> | 80% | 48,254 psi | 77% | 2415 fps | 100% |
| Winchester 760 | 56.6 gr | 86% | 39,363 psi | 63% | 2323 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 90% | 26,324 psi | 42% | 2133 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,251 psi | 71% | 2352 fps | 99.9% |
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 102 powders for .338 Win Mag. loaded with the .338 | 250gr | Sierra MatchKing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,621 fps; across all powders the maximum-charge window runs from 1,496 fps to 2,621 fps. Accurate 3100 gives the best case fill at 100 %, and 102 of the 102 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-16 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, Winchester 760 rank at the top here: for .338 Win Mag. with the .338 | 250gr | Sierra MatchKing 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.