Load Specifications
Bullet Manufacturer:TWENTY-NINE
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:1:10.5
Load data in caliber .338 Win Mag. with .338 | 250gr | TWENTY-NINE ERTP bullet and 101 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 Alliant Power Pro 2000-MR.
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>> | 84% | 53,766 psi | 86% | 2349 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 55,550 psi | 89% | 2415 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 55,332 psi | 89% | 2411 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 53,882 psi | 86% | 2431 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 54,926 psi | 88% | 2421 fps | 97.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 38,769 psi | 62% | 2283 fps | 96.1% |
| Accurate 4064 | <<locked>> | 92% | 55,288 psi | 89% | 2454 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,621 psi | 88% | 2533 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 88% | 56,028 psi | 90% | 2487 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 53,650 psi | 86% | 2444 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,129 psi | 88% | 2441 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 55,854 psi | 90% | 2411 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,419 psi | 89% | 2595 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 53,388 psi | 86% | 2461 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 54,012 psi | 87% | 2480 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,852 psi | 85% | 2539 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 96% | 53,650 psi | 86% | 2569 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,521 psi | 60% | 2313 fps | 99% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,495 psi | 67% | 2451 fps | 98.2% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,680 psi | 89% | 2503 fps | 99.9% |
| Bofors RP3 | <<locked>> | 92% | 53,795 psi | 86% | 2474 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 54,288 psi | 87% | 2454 fps | 97.8% |
| Hodgdon Benchmark | <<locked>> | 84% | 53,592 psi | 86% | 2382 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 54,360 psi | 87% | 2470 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 56,434 psi | 90% | 2562 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 55,999 psi | 90% | 2431 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,926 psi | 88% | 2487 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 98% | 54,215 psi | 87% | 2536 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 96% | 55,274 psi | 89% | 2500 fps | 97.4% |
| Hodgdon H4895 | <<locked>> | 86% | 53,185 psi | 85% | 2451 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,023 psi | 79% | 2431 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,738 psi | 89% | 2526 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 54,752 psi | 88% | 2569 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,549 psi | 57% | 1467 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,302 psi | 87% | 2451 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 53,200 psi | 85% | 2434 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 53,098 psi | 85% | 2428 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 88% | 53,200 psi | 85% | 2408 fps | 98.1% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,157 psi | 87% | 2474 fps | 97.8% |
| IMR 4451 Enduron | <<locked>> | 96% | 56,028 psi | 90% | 2477 fps | 98.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,634 psi | 83% | 2480 fps | 99.7% |
| IMR 4895 | <<locked>> | 90% | 55,376 psi | 89% | 2507 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 55,129 psi | 88% | 2441 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 55,361 psi | 89% | 2428 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,666 psi | 89% | 2464 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,811 psi | 89% | 2421 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 56,217 psi | 90% | 2464 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,100 psi | 88% | 2470 fps | 99.3% |
| Lovex S070ᴾ | <<locked>> | 100% | 56,130 psi | 90% | 2503 fps | 98.7% |
| Norma 201 | <<locked>> | 88% | 54,940 psi | 88% | 2438 fps | 100% |
| Norma 202 | <<locked>> | 88% | 55,477 psi | 89% | 2438 fps | 100% |
| Norma 203B | <<locked>> | 90% | 53,243 psi | 85% | 2470 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 54,781 psi | 88% | 2516 fps | 96.7% |
| Norma URPᴾ | <<locked>> | 100% | 53,882 psi | 86% | 2526 fps | 99.8% |
| Ramshot Big Game | <<locked>> | 90% | 53,432 psi | 86% | 2493 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,634 psi | 84% | 2523 fps | 98.9% |
| Ramshot TAC | <<locked>> | 86% | 55,492 psi | 89% | 2467 fps | 99.4% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,042 psi | 88% | 2480 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 56,028 psi | 90% | 2444 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,042 psi | 58% | 1503 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 54,766 psi | 88% | 2421 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,187 psi | 88% | 2474 fps | 98.9% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,259 psi | 87% | 2539 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 53,679 psi | 86% | 2569 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,172 psi | 87% | 2556 fps | 99.8% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,346 psi | 87% | 2585 fps | 99.7% |
| Rottweil R 901 | <<locked>> | 86% | 55,883 psi | 90% | 2415 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 55,361 psi | 89% | 2434 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 53,664 psi | 86% | 2467 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 54,288 psi | 87% | 2454 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,100 psi | 88% | 2470 fps | 99.3% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,666 psi | 89% | 2464 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 56,217 psi | 90% | 2464 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 56,130 psi | 90% | 2503 fps | 98.7% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,492 psi | 89% | 2526 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 53,780 psi | 86% | 2444 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,302 psi | 87% | 2461 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 53,214 psi | 85% | 2339 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 53,142 psi | 85% | 2339 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 55,811 psi | 89% | 2434 fps | 98.4% |
| Somchem S321 | <<locked>> | 82% | 52,866 psi | 85% | 2428 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,883 psi | 90% | 2379 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 53,142 psi | 85% | 2434 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 54,172 psi | 87% | 2467 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,153 psi | 77% | 2480 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 44,962 psi | 72% | 2379 fps | 96% |
| Vihtavuori N130 | <<locked>> | 82% | 53,040 psi | 85% | 2303 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 53,432 psi | 86% | 2326 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,027 psi | 88% | 2398 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,709 psi | 89% | 2415 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,521 psi | 89% | 2444 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 56,420 psi | 90% | 2520 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 86% | 55,738 psi | 89% | 2441 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 53,867 psi | 86% | 2418 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,245 psi | 89% | 2526 fps | 99.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,857 psi | 66% | 2382 fps | 98.9% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 53,229 psi | 85% | 2457 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 55,347 psi | 89% | 2484 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 54,215 psi | 87% | 2536 fps | 98.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,547 psi | 54% | 2316 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 88% | 54,201 psi | 87% | 2470 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% | 47,558 psi | 76% | 2270 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,924 psi | 83% | 2372 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,306 psi | 65% | 2215 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,934 psi | 75% | 2343 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 45,194 psi | 72% | 2280 fps | 95.7% |
| Accurate 3100 | <<locked>> | 98% | 36,201 psi | 58% | 2238 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 38,130 psi | 61% | 2211 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 31,676 psi | 51% | 2152 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 43,758 psi | 70% | 2306 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 80% | 37,289 psi | 60% | 2182 fps | 97.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,818 psi | 73% | 2313 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 45,919 psi | 74% | 2293 fps | 100% |
| Alliant Power Pro 2000-MR | 51.2 gr | 80% | 39,537 psi | 63% | 2336 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,767 psi | 59% | 2201 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,508 psi | 63% | 2254 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 30,487 psi | 49% | 2116 fps | 95% |
| Alliant Reloder-17 | 50.5 gr | 80% | 31,749 psi | 51% | 2178 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 90% | 27,818 psi | 45% | 2083 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 94% | 33,953 psi | 54% | 2287 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,873 psi | 69% | 2316 fps | 98.8% |
| Bofors RP3 | <<locked>> | 80% | 36,274 psi | 58% | 2205 fps | 99.1% |
| Bofors RP7 | <<locked>> | 88% | 42,308 psi | 68% | 2267 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,688 psi | 76% | 2300 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,353 psi | 71% | 2333 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,892 psi | 78% | 2457 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 80% | 52,489 psi | 84% | 2388 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,086 psi | 59% | 2205 fps | 96.8% |
| Hodgdon H414 | <<locked>> | 88% | 39,044 psi | 63% | 2293 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 90% | 45,600 psi | 73% | 2359 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 44,121 psi | 71% | 2316 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 26,165 psi | 42% | 1985 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,900 psi | 64% | 2293 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 90% | 41,452 psi | 66% | 2356 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,397 psi | 42% | 1306 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,279 psi | 68% | 2274 fps | 99.6% |
| IMR 3031 | <<locked>> | 80% | 43,830 psi | 70% | 2310 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,102 psi | 63% | 2208 fps | 98.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 41,655 psi | 67% | 2228 fps | 95.7% |
| IMR 4350 | <<locked>> | 92% | 42,279 psi | 68% | 2293 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 86% | 41,481 psi | 67% | 2254 fps | 95.5% |
| IMR 4831 | <<locked>> | 84% | 30,908 psi | 50% | 2119 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 40,437 psi | 65% | 2280 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 80% | 45,818 psi | 73% | 2313 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 51,735 psi | 83% | 2382 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,844 psi | 69% | 2290 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,918 psi | 70% | 2251 fps | 99.5% |
| Lovex S062 | <<locked>> | 80% | 39,030 psi | 63% | 2215 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 36,201 psi | 58% | 2165 fps | 95.6% |
| Lovex S070 | <<locked>> | 88% | 38,653 psi | 62% | 2231 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 43,018 psi | 69% | 2267 fps | 99.9% |
| Norma 202 | <<locked>> | 80% | 43,105 psi | 69% | 2270 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,856 psi | 62% | 2244 fps | 98.9% |
| Norma 204 | <<locked>> | 96% | 47,921 psi | 77% | 2418 fps | 95.2% |
| Norma URP | <<locked>> | 84% | 32,329 psi | 52% | 2159 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 38,218 psi | 61% | 2257 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 38,247 psi | 61% | 2283 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 45,672 psi | 73% | 2323 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,063 psi | 72% | 2339 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,226 psi | 79% | 2356 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,701 psi | 43% | 1339 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,169 psi | 82% | 2379 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 37,565 psi | 60% | 2192 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,379 psi | 66% | 2346 fps | 98.9% |
| ReloadSwiss RS 60 | 50.5 gr | 80% | 33,794 psi | 54% | 2234 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 31,502 psi | 51% | 2165 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 34,040 psi | 55% | 2221 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 46,905 psi | 75% | 2297 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,944 psi | 66% | 2228 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 80% | 34,258 psi | 55% | 2159 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 88% | 42,308 psi | 68% | 2267 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 84% | 36,201 psi | 58% | 2165 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,844 psi | 69% | 2290 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,030 psi | 63% | 2215 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 38,653 psi | 62% | 2231 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,157 psi | 56% | 2201 fps | 98% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,859 psi | 70% | 2300 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,264 psi | 68% | 2283 fps | 99.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,367 psi | 71% | 2221 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,840 psi | 59% | 2110 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 40,219 psi | 64% | 2205 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 49,472 psi | 79% | 2382 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,990 psi | 71% | 2224 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,700 psi | 70% | 2297 fps | 99.4% |
| Somchem S355 | <<locked>> | 80% | 35,215 psi | 56% | 2165 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 25,396 psi | 41% | 2018 fps | 96.2% |
| Somchem S385 | <<locked>> | 98% | 42,192 psi | 68% | 2329 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 50,053 psi | 80% | 2267 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,657 psi | 72% | 2215 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,306 psi | 65% | 2205 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,872 psi | 66% | 2215 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,388 psi | 54% | 2110 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 31,604 psi | 51% | 2110 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 45,803 psi | 73% | 2306 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 39,160 psi | 63% | 2208 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 33,098 psi | 53% | 2159 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 90% | 29,704 psi | 48% | 2152 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,631 psi | 48% | 2047 fps | 96.7% |
| Winchester 748 | <<locked>> | 80% | 45,498 psi | 73% | 2352 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 39,291 psi | 63% | 2297 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 94% | 27,847 psi | 45% | 2152 fps | 95.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,582 psi | 67% | 2287 fps | 99.6% |
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 101 powders for .338 Win Mag. loaded with the .338 | 250gr | TWENTY-NINE ERTP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,595 fps; across all powders the maximum-charge window runs from 1,467 fps to 2,595 fps. Accurate 3100 gives the best case fill at 100 %, and 101 of the 101 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:10.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, 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, Alliant Power Pro 2000-MR rank at the top here: for .338 Win Mag. with the .338 | 250gr | TWENTY-NINE ERTP 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.