Load Specifications
Bullet:.338 | 250gr | Norma GTX
Bullet Manufacturer:Norma
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 | Norma GTX 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% | 53,563 psi | 86% | 2369 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,753 psi | 89% | 2438 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 53,606 psi | 86% | 2451 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,563 psi | 87% | 2451 fps | 98.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,627 psi | 68% | 2372 fps | 97.6% |
| Accurate 4064 | <<locked>> | 90% | 55,854 psi | 90% | 2484 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,564 psi | 89% | 2572 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 56,072 psi | 90% | 2513 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 53,505 psi | 86% | 2470 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 50,299 psi | 81% | 2503 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,984 psi | 88% | 2467 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,028 psi | 90% | 2434 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,506 psi | 89% | 2625 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 53,708 psi | 86% | 2490 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,070 psi | 87% | 2507 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 53,055 psi | 85% | 2572 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,273 psi | 87% | 2605 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 49,356 psi | 79% | 2497 fps | 96.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,596 psi | 65% | 2398 fps | 99.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,339 psi | 73% | 2549 fps | 99.4% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,782 psi | 89% | 2533 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 54,288 psi | 87% | 2507 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,230 psi | 87% | 2484 fps | 98.3% |
| Hodgdon Benchmark | <<locked>> | 82% | 53,316 psi | 85% | 2405 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,288 psi | 87% | 2493 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,246 psi | 90% | 2585 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,056 psi | 88% | 2520 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 96% | 54,592 psi | 88% | 2569 fps | 98.9% |
| Hodgdon H4350 | <<locked>> | 94% | 55,390 psi | 89% | 2536 fps | 97.9% |
| Hodgdon H4895 | <<locked>> | 84% | 53,214 psi | 85% | 2477 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,968 psi | 85% | 2507 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,101 psi | 90% | 2552 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,056 psi | 88% | 2608 fps | 98.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,868 psi | 58% | 1499 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,302 psi | 87% | 2477 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 53,403 psi | 86% | 2457 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,362 psi | 90% | 2497 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 56,275 psi | 90% | 2484 fps | 98.9% |
| IMR 4350 | <<locked>> | 98% | 54,331 psi | 87% | 2507 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,115 psi | 90% | 2510 fps | 98.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,782 psi | 89% | 2559 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 55,463 psi | 89% | 2533 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,984 psi | 88% | 2467 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,738 psi | 89% | 2487 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,492 psi | 89% | 2448 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 53,011 psi | 85% | 2451 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,347 psi | 89% | 2503 fps | 99.6% |
| Lovex S070 | <<locked>> | 98% | 56,434 psi | 90% | 2539 fps | 99.1% |
| Norma 201 | <<locked>> | 86% | 54,839 psi | 88% | 2464 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,376 psi | 89% | 2461 fps | 100% |
| Norma 203B | <<locked>> | 88% | 53,287 psi | 85% | 2497 fps | 100% |
| Norma 204 | <<locked>> | 98% | 54,882 psi | 88% | 2552 fps | 97.3% |
| Norma MRPᴾ | <<locked>> | 100% | 45,092 psi | 72% | 2507 fps | 97.1% |
| Norma URP | <<locked>> | 98% | 54,462 psi | 87% | 2559 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 88% | 53,679 psi | 86% | 2523 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 53,040 psi | 85% | 2559 fps | 99.2% |
| Ramshot TAC | <<locked>> | 84% | 55,027 psi | 88% | 2490 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,824 psi | 88% | 2503 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,521 psi | 89% | 2467 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,361 psi | 58% | 1535 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,390 psi | 89% | 2507 fps | 99.2% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,766 psi | 88% | 2569 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,925 psi | 86% | 2598 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,100 psi | 88% | 2595 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,549 psi | 87% | 2621 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 84% | 55,840 psi | 90% | 2441 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,201 psi | 89% | 2461 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,172 psi | 87% | 2497 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 48,022 psi | 77% | 2480 fps | 96.4% |
| Rottweil R 907 | <<locked>> | 94% | 54,230 psi | 87% | 2484 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,347 psi | 89% | 2503 fps | 99.6% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,738 psi | 89% | 2487 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 53,011 psi | 85% | 2451 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 56,434 psi | 90% | 2539 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,608 psi | 89% | 2552 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,563 psi | 86% | 2470 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,433 psi | 87% | 2490 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 56,304 psi | 90% | 2402 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 56,347 psi | 90% | 2402 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,637 psi | 89% | 2464 fps | 98.8% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 47,572 psi | 76% | 2474 fps | 96.3% |
| Somchem S321 | <<locked>> | 82% | 56,057 psi | 90% | 2493 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,651 psi | 89% | 2402 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 53,200 psi | 85% | 2461 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,331 psi | 87% | 2493 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,344 psi | 84% | 2559 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,733 psi | 78% | 2464 fps | 97.4% |
| Vihtavuori N130 | <<locked>> | 82% | 55,869 psi | 90% | 2362 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 53,098 psi | 85% | 2346 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,187 psi | 88% | 2425 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,695 psi | 89% | 2441 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,622 psi | 89% | 2474 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 53,476 psi | 86% | 2510 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 84% | 55,506 psi | 89% | 2467 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 53,911 psi | 86% | 2441 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,767 psi | 89% | 2559 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,686 psi | 72% | 2464 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 53,403 psi | 86% | 2490 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,448 psi | 89% | 2510 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,882 psi | 88% | 2575 fps | 98.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,172 psi | 58% | 2415 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,288 psi | 87% | 2497 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% | 50,502 psi | 81% | 2333 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,192 psi | 69% | 2274 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,270 psi | 81% | 2408 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,061 psi | 67% | 2257 fps | 95.4% |
| Accurate 3100 | <<locked>> | 94% | 34,708 psi | 56% | 2228 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 40,843 psi | 65% | 2277 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,008 psi | 48% | 2133 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 46,427 psi | 74% | 2375 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 39,552 psi | 63% | 2247 fps | 98.8% |
| ADI AR 2209 | <<locked>> | 98% | 47,137 psi | 76% | 2451 fps | 95.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,530 psi | 78% | 2379 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,197 psi | 79% | 2356 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,438 psi | 68% | 2421 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,378 psi | 63% | 2270 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,134 psi | 68% | 2326 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,603 psi | 49% | 2146 fps | 95.7% |
| Alliant Reloder-17 | 53.9 gr | 80% | 33,866 psi | 54% | 2254 fps | 98.6% |
| Alliant Reloder-19 | <<locked>> | 98% | 46,311 psi | 74% | 2448 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 86% | 26,556 psi | 43% | 2073 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 90% | 32,126 psi | 52% | 2270 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,643 psi | 73% | 2385 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 39,117 psi | 63% | 2277 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 39,900 psi | 64% | 2254 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,096 psi | 80% | 2362 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,616 psi | 76% | 2405 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,475 psi | 84% | 2533 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,711 psi | 64% | 2280 fps | 98% |
| Hodgdon H414 | <<locked>> | 86% | 39,349 psi | 63% | 2323 fps | 95.8% |
| Hodgdon H4350 | <<locked>> | 86% | 43,076 psi | 69% | 2346 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 46,891 psi | 75% | 2385 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,992 psi | 45% | 2057 fps | 96.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,960 psi | 69% | 2369 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 41,553 psi | 67% | 2388 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,629 psi | 43% | 1332 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,875 psi | 72% | 2343 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 46,934 psi | 75% | 2372 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,510 psi | 67% | 2277 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,888 psi | 70% | 2297 fps | 96.8% |
| IMR 4350 | <<locked>> | 88% | 39,871 psi | 64% | 2277 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 82% | 39,015 psi | 63% | 2234 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 29,327 psi | 47% | 2100 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 43,149 psi | 69% | 2352 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 48,530 psi | 78% | 2379 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,890 psi | 74% | 2359 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,282 psi | 74% | 2316 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 41,510 psi | 67% | 2280 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 34,142 psi | 55% | 2146 fps | 95.4% |
| Lovex S070 | <<locked>> | 84% | 36,666 psi | 59% | 2218 fps | 95% |
| Norma 201 | <<locked>> | 80% | 45,571 psi | 73% | 2333 fps | 100% |
| Norma 202 | <<locked>> | 80% | 45,963 psi | 74% | 2336 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,481 psi | 67% | 2316 fps | 99.5% |
| Norma 204 | <<locked>> | 92% | 44,918 psi | 72% | 2402 fps | 95.1% |
| Norma MRP | <<locked>> | 96% | 39,697 psi | 64% | 2405 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 30,400 psi | 49% | 2133 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 41,147 psi | 66% | 2333 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 36,143 psi | 58% | 2267 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 48,269 psi | 77% | 2392 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,964 psi | 77% | 2408 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,257 psi | 84% | 2425 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,137 psi | 44% | 1368 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,132 psi | 64% | 2267 fps | 96.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,643 psi | 72% | 2421 fps | 99.6% |
| ReloadSwiss RS 60 | 53.9 gr | 80% | 36,071 psi | 58% | 2310 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 31,850 psi | 51% | 2195 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 34,098 psi | 55% | 2251 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 49,501 psi | 79% | 2356 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,453 psi | 70% | 2293 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 36,666 psi | 59% | 2228 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 98% | 44,933 psi | 72% | 2428 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 84% | 39,900 psi | 64% | 2254 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,142 psi | 55% | 2146 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,890 psi | 74% | 2359 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,510 psi | 67% | 2280 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 36,666 psi | 59% | 2218 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,666 psi | 60% | 2274 fps | 98.9% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,673 psi | 75% | 2372 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,918 psi | 72% | 2352 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,775 psi | 75% | 2280 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,073 psi | 63% | 2169 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 37,855 psi | 61% | 2188 fps | 95.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 44,527 psi | 71% | 2425 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 52,431 psi | 84% | 2448 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,412 psi | 74% | 2283 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,456 psi | 74% | 2365 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 37,565 psi | 60% | 2231 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 27,296 psi | 44% | 2096 fps | 97.7% |
| Somchem S385 | <<locked>> | 94% | 40,103 psi | 64% | 2320 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 52,692 psi | 84% | 2323 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,137 psi | 76% | 2270 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,004 psi | 69% | 2267 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,366 psi | 70% | 2277 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,607 psi | 57% | 2172 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 31,763 psi | 51% | 2136 fps | 95.9% |
| Vihtavuori N530 | <<locked>> | 80% | 48,762 psi | 78% | 2379 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,771 psi | 67% | 2274 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 31,241 psi | 50% | 2139 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 86% | 28,427 psi | 46% | 2136 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,459 psi | 50% | 2116 fps | 98% |
| Winchester 748 | <<locked>> | 80% | 48,486 psi | 78% | 2418 fps | 100% |
| Winchester 760 | 56.8 gr | 86% | 39,552 psi | 63% | 2326 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 90% | 26,411 psi | 42% | 2136 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,425 psi | 71% | 2356 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 | Norma GTX. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,625 fps; across all powders the maximum-charge window runs from 1,499 fps to 2,625 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 58–90 %, 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-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. Alliant Reloder-17, ReloadSwiss RS 60, Winchester 760 rank at the top here: for .338 Win Mag. with the .338 | 250gr | Norma GTX 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.