Load Specifications
Load data in caliber .338 Win Mag. with .338 | 275gr | Speer AGS TS 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, Alliant Reloder-26 and Hodgdon Superformance.
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.
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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% | 56,333 psi | 90% | 2336 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 54,056 psi | 87% | 2359 fps | 99.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 50,618 psi | 81% | 2398 fps | 99.7% |
| Accurate 4064 | <<locked>> | 84% | 53,214 psi | 85% | 2346 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 53,301 psi | 85% | 2441 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 52,315 psi | 84% | 2520 fps | 96.5% |
| ADI AR 2206H | <<locked>> | 82% | 55,811 psi | 89% | 2411 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 53,505 psi | 86% | 2375 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 54,230 psi | 87% | 2480 fps | 98.7% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 51,677 psi | 83% | 2470 fps | 97.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 56,014 psi | 90% | 2526 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 53,940 psi | 86% | 2392 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 54,259 psi | 87% | 2411 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 54,186 psi | 87% | 2487 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 55,172 psi | 88% | 2510 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 53,258 psi | 85% | 2467 fps | 98.7% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 50,241 psi | 81% | 2470 fps | 98.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 47,471 psi | 76% | 2415 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 41,524 psi | 67% | 2356 fps | 99.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 54,172 psi | 87% | 2582 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 55,477 psi | 89% | 2431 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 46,340 psi | 74% | 2411 fps | 97.5% |
| Bofors RP3 | <<locked>> | 86% | 54,621 psi | 88% | 2405 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 50,241 psi | 81% | 2470 fps | 98.4% |
| Bofors RP7 | <<locked>> | 90% | 54,273 psi | 87% | 2398 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 86% | 55,288 psi | 89% | 2425 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 55,521 psi | 89% | 2487 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 90% | 55,651 psi | 89% | 2451 fps | 99.1% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 55,564 psi | 89% | 2477 fps | 97.3% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 54,230 psi | 87% | 2457 fps | 97% |
| Hodgdon H4895 | <<locked>> | 82% | 56,420 psi | 90% | 2418 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 54,404 psi | 87% | 2421 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 52,895 psi | 85% | 2408 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 40,727 psi | 65% | 2379 fps | 96.7% |
| Hodgdon Superformance | <<locked>> | 92% | 55,521 psi | 89% | 2523 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,318 psi | 58% | 1453 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 53,925 psi | 86% | 2375 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 56,391 psi | 90% | 2402 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 55,622 psi | 89% | 2392 fps | 99.7% |
| IMR 4350 | <<locked>> | 94% | 54,940 psi | 88% | 2428 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 90% | 55,927 psi | 90% | 2421 fps | 99.6% |
| IMR 4831 | <<locked>> | 94% | 53,664 psi | 86% | 2431 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 55,622 psi | 89% | 2434 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 53,867 psi | 86% | 2418 fps | 97.2% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 49,298 psi | 79% | 2448 fps | 96.8% |
| Lovex D073.6 | <<locked>> | 82% | 56,130 psi | 90% | 2385 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 54,549 psi | 87% | 2339 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 53,214 psi | 85% | 2352 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 55,753 psi | 89% | 2415 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 53,606 psi | 86% | 2411 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 42,177 psi | 68% | 2277 fps | 98.8% |
| Norma 201 | <<locked>> | 82% | 54,621 psi | 88% | 2359 fps | 100% |
| Norma 202 | <<locked>> | 82% | 55,259 psi | 89% | 2356 fps | 100% |
| Norma 203B | <<locked>> | 84% | 53,548 psi | 86% | 2398 fps | 100% |
| Norma 204 | <<locked>> | 94% | 55,463 psi | 89% | 2474 fps | 98.7% |
| Norma MRPᴾ | <<locked>> | 100% | 53,374 psi | 86% | 2546 fps | 99.6% |
| Norma URP | <<locked>> | 94% | 55,477 psi | 89% | 2470 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 54,215 psi | 87% | 2425 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 49,414 psi | 79% | 2461 fps | 97.2% |
| Ramshot Hunter | <<locked>> | 94% | 54,157 psi | 87% | 2477 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 43,845 psi | 70% | 2356 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,101 psi | 59% | 1493 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 55,013 psi | 88% | 2411 fps | 99.8% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 55,216 psi | 89% | 2470 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 54,868 psi | 88% | 2500 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 52,953 psi | 85% | 2464 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 55,129 psi | 88% | 2533 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 40,277 psi | 65% | 2372 fps | 97.6% |
| Rottweil R 902 | <<locked>> | 84% | 55,201 psi | 89% | 2359 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 54,766 psi | 88% | 2405 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,999 psi | 90% | 2454 fps | 98% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 56,115 psi | 90% | 2503 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 90% | 54,273 psi | 87% | 2398 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 55,753 psi | 89% | 2415 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 56,130 psi | 90% | 2385 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 53,214 psi | 85% | 2352 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 53,606 psi | 86% | 2411 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 56,246 psi | 90% | 2457 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 54,128 psi | 87% | 2388 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 55,361 psi | 89% | 2293 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 56,115 psi | 90% | 2300 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 55,521 psi | 89% | 2379 fps | 99.6% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 55,608 psi | 89% | 2500 fps | 99% |
| Somchem S335 | <<locked>> | 82% | 55,143 psi | 88% | 2297 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 54,679 psi | 88% | 2398 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 53,983 psi | 87% | 2402 fps | 96.9% |
| Somchem S365 | <<locked>> | 96% | 54,331 psi | 87% | 2470 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 53,272 psi | 85% | 2438 fps | 99.2% |
| Vihtavuori N133 | <<locked>> | 82% | 55,840 psi | 90% | 2277 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 55,376 psi | 89% | 2320 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 55,666 psi | 89% | 2336 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,912 psi | 90% | 2375 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 54,360 psi | 87% | 2421 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 48,994 psi | 79% | 2369 fps | 98.4% |
| Vihtavuori N540 | <<locked>> | 84% | 53,838 psi | 86% | 2339 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 53,229 psi | 85% | 2428 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 53,316 psi | 85% | 2480 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 53,954 psi | 87% | 2536 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 53,592 psi | 86% | 2395 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 55,724 psi | 89% | 2490 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 42,743 psi | 69% | 2467 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,099 psi | 87% | 2395 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 53,316 psi | 85% | 2434 fps | 98.5% |
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% | 49,545 psi | 79% | 2257 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 47,572 psi | 76% | 2267 fps | 98.2% |
| Accurate 3100 | <<locked>> | 84% | 29,617 psi | 47% | 2031 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 46,934 psi | 75% | 2264 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 35,447 psi | 57% | 2162 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 98% | 48,689 psi | 78% | 2467 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 52,359 psi | 84% | 2365 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 44,527 psi | 71% | 2247 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 88% | 39,378 psi | 63% | 2238 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 96% | 45,484 psi | 73% | 2372 fps | 95.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 48,791 psi | 78% | 2431 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 44,846 psi | 72% | 2267 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,906 psi | 77% | 2323 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,940 psi | 56% | 2172 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 39,276 psi | 63% | 2274 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 38,943 psi | 62% | 2234 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 92% | 38,783 psi | 62% | 2277 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,483 psi | 41% | 1969 fps | 96.9% |
| Alliant Reloder-25 | <<locked>> | 90% | 30,618 psi | 49% | 2116 fps | 95.8% |
| Alliant Reloder-26 | 59.9 gr | 82% | 28,689 psi | 46% | 2110 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,837 psi | 83% | 2382 fps | 100% |
| Bofors RP15 | <<locked>> | 94% | 38,276 psi | 61% | 2264 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 44,991 psi | 72% | 2277 fps | 100% |
| Bofors RP5 | <<locked>> | 92% | 38,783 psi | 62% | 2277 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 39,856 psi | 64% | 2172 fps | 96.8% |
| Hodgdon H380 | <<locked>> | 80% | 45,440 psi | 73% | 2287 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 80% | 37,434 psi | 60% | 2201 fps | 96.8% |
| Hodgdon H4350 | <<locked>> | 80% | 40,538 psi | 65% | 2218 fps | 96.3% |
| Hodgdon H4831 | <<locked>> | 94% | 45,455 psi | 73% | 2326 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 96% | 47,659 psi | 76% | 2362 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 52,910 psi | 85% | 2372 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 32,372 psi | 52% | 2080 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 49,356 psi | 79% | 2362 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 38,232 psi | 61% | 2326 fps | 95.7% |
| Hodgdon Superformance | 60.3 gr | 80% | 36,289 psi | 58% | 2208 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,108 psi | 43% | 1296 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 50,560 psi | 81% | 2329 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,847 psi | 75% | 2274 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,979 psi | 79% | 2297 fps | 99% |
| IMR 4350 | <<locked>> | 80% | 35,563 psi | 57% | 2113 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 41,336 psi | 66% | 2198 fps | 97.6% |
| IMR 4831 | <<locked>> | 80% | 34,301 psi | 55% | 2126 fps | 98.5% |
| IMR 4895 | <<locked>> | 80% | 49,110 psi | 79% | 2346 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 44,701 psi | 72% | 2280 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 96% | 43,337 psi | 69% | 2349 fps | 95.2% |
| Lovex D073.6 | <<locked>> | 80% | 52,547 psi | 84% | 2343 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 51,430 psi | 82% | 2300 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,963 psi | 75% | 2270 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,754 psi | 62% | 2156 fps | 98.3% |
| Lovex S070 | <<locked>> | 80% | 36,985 psi | 59% | 2142 fps | 96.8% |
| Lovex S071 | <<locked>> | 90% | 30,792 psi | 49% | 2060 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 51,227 psi | 82% | 2316 fps | 100% |
| Norma 202 | <<locked>> | 80% | 51,779 psi | 83% | 2313 fps | 100% |
| Norma 203B | <<locked>> | 80% | 47,253 psi | 76% | 2313 fps | 100% |
| Norma 204 | <<locked>> | 84% | 39,813 psi | 64% | 2231 fps | 95.5% |
| Norma MRP | <<locked>> | 86% | 33,272 psi | 53% | 2188 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 35,418 psi | 57% | 2156 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 80% | 47,398 psi | 76% | 2336 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 43,018 psi | 69% | 2356 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 34,360 psi | 55% | 2149 fps | 96.7% |
| Ramshot Magnum | <<locked>> | 96% | 38,014 psi | 61% | 2251 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,688 psi | 44% | 1329 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 45,513 psi | 73% | 2274 fps | 99% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 51,634 psi | 83% | 2425 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 41,756 psi | 67% | 2320 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 35,070 psi | 56% | 2178 fps | 98.4% |
| ReloadSwiss RS 70 | 58 gr | 80% | 34,389 psi | 55% | 2185 fps | 97.8% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 35,215 psi | 56% | 2257 fps | 95.5% |
| Rottweil R 902 | <<locked>> | 80% | 48,965 psi | 79% | 2280 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 42,366 psi | 68% | 2231 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 43,511 psi | 70% | 2267 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 88% | 37,913 psi | 61% | 2221 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 39,856 psi | 64% | 2172 fps | 96.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,754 psi | 62% | 2156 fps | 98.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 52,547 psi | 84% | 2343 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,963 psi | 75% | 2270 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,985 psi | 59% | 2142 fps | 96.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 43,410 psi | 70% | 2280 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 50,807 psi | 81% | 2346 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 52,040 psi | 83% | 2254 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,903 psi | 70% | 2149 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,869 psi | 61% | 2110 fps | 96.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 37,565 psi | 60% | 2215 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 51,808 psi | 83% | 2257 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 42,815 psi | 69% | 2231 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 47,398 psi | 76% | 2306 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 31,923 psi | 51% | 2123 fps | 99.9% |
| Somchem S385 | <<locked>> | 86% | 36,129 psi | 58% | 2162 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 52,576 psi | 84% | 2241 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,907 psi | 78% | 2244 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 49,110 psi | 79% | 2257 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,828 psi | 65% | 2172 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,840 psi | 59% | 2156 fps | 98.8% |
| Vihtavuori N165 | <<locked>> | 92% | 37,898 psi | 61% | 2188 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 47,442 psi | 76% | 2257 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 36,289 psi | 58% | 2159 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 80% | 27,731 psi | 44% | 2031 fps | 96.9% |
| Vihtavuori N560 | <<locked>> | 94% | 44,077 psi | 71% | 2382 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,882 psi | 58% | 2129 fps | 99.8% |
| Winchester 760 | <<locked>> | 80% | 37,594 psi | 60% | 2205 fps | 96.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 22,481 psi | 36% | 1942 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,749 psi | 81% | 2352 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 37,884 psi | 61% | 2192 fps | 95% |
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 109 powders for .338 Win Mag. loaded with the .338 | 275gr | Speer AGS TS. Alliant Reloder-26 delivers the highest muzzle velocity at 2,582 fps; across all powders the maximum-charge window runs from 1,453 fps to 2,582 fps. Accurate 3100 gives the best case fill at 100 %, and 109 of the 109 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 275.0 gr projectile in 0.338" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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, Alliant Reloder-26, Hodgdon Superformance rank at the top here: for .338 Win Mag. with the .338 | 275gr | Speer AGS TS they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, ADI AR 2225, Baschieri & Pellagri 109 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.