Load Specifications
Bullet Manufacturer:A-Square
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
Load data in caliber .338 Win Mag. with .338 | 250gr | A-Square MONO RN bullet and 105 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-17 and Alliant Reloder-26.
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 2495 | <<locked>> | 84% | 55,376 psi | 89% | 2467 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 53,171 psi | 85% | 2484 fps | 98.6% |
| Accurate 3100ᴾ | <<locked>> | 100% | 49,458 psi | 79% | 2516 fps | 99.3% |
| Accurate 4064 | <<locked>> | 86% | 55,550 psi | 89% | 2516 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 55,738 psi | 89% | 2615 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 54,056 psi | 87% | 2697 fps | 97.5% |
| ADI AR 2206H | <<locked>> | 82% | 54,694 psi | 88% | 2539 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 55,840 psi | 90% | 2543 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 53,200 psi | 85% | 2602 fps | 98% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 50,836 psi | 82% | 2589 fps | 96.2% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 54,723 psi | 88% | 2657 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 53,142 psi | 85% | 2598 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 56,376 psi | 90% | 2562 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 53,388 psi | 86% | 2539 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 56,391 psi | 90% | 2661 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 90% | 54,085 psi | 87% | 2638 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 55,709 psi | 89% | 2641 fps | 98.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 49,269 psi | 79% | 2589 fps | 97.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 46,673 psi | 75% | 2536 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 40,669 psi | 65% | 2461 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 52,823 psi | 85% | 2707 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 54,433 psi | 87% | 2559 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 45,252 psi | 73% | 2520 fps | 96.5% |
| Bofors RP3 | <<locked>> | 86% | 53,650 psi | 86% | 2536 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 49,269 psi | 79% | 2589 fps | 97.6% |
| Bofors RP7 | <<locked>> | 90% | 53,316 psi | 85% | 2520 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 86% | 54,259 psi | 87% | 2552 fps | 100% |
| Hodgdon H414 | <<locked>> | 92% | 54,447 psi | 87% | 2612 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 90% | 54,592 psi | 88% | 2575 fps | 98.5% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 54,578 psi | 88% | 2595 fps | 96.4% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 53,330 psi | 86% | 2579 fps | 96.1% |
| Hodgdon H4895 | <<locked>> | 82% | 55,332 psi | 89% | 2546 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 53,214 psi | 85% | 2546 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 55,376 psi | 89% | 2582 fps | 100% |
| Hodgdon Superformance | <<locked>> | 92% | 54,433 psi | 87% | 2648 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,158 psi | 58% | 1549 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 56,434 psi | 90% | 2549 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 55,883 psi | 90% | 2523 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 55,390 psi | 89% | 2530 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 54,781 psi | 88% | 2516 fps | 99.3% |
| IMR 4350 | <<locked>> | 94% | 53,838 psi | 86% | 2549 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 90% | 54,911 psi | 88% | 2546 fps | 99.2% |
| IMR 4831 | <<locked>> | 96% | 56,130 psi | 90% | 2605 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 54,795 psi | 88% | 2566 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 56,231 psi | 90% | 2585 fps | 96.9% |
| Lovex D073.6 | <<locked>> | 82% | 54,897 psi | 88% | 2513 fps | 100% |
| Lovex S060 | <<locked>> | 82% | 53,795 psi | 86% | 2470 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 55,405 psi | 89% | 2520 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 54,824 psi | 88% | 2543 fps | 99.8% |
| Lovex S070 | <<locked>> | 94% | 56,072 psi | 90% | 2582 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 41,191 psi | 66% | 2382 fps | 98% |
| Norma 201 | <<locked>> | 82% | 53,476 psi | 86% | 2487 fps | 100% |
| Norma 202 | <<locked>> | 82% | 54,288 psi | 87% | 2487 fps | 100% |
| Norma 203B | <<locked>> | 86% | 55,999 psi | 90% | 2572 fps | 100% |
| Norma 204 | <<locked>> | 94% | 54,433 psi | 87% | 2595 fps | 98.1% |
| Norma MRPᴾ | <<locked>> | 100% | 52,272 psi | 84% | 2667 fps | 99.2% |
| Norma URP | <<locked>> | 94% | 54,578 psi | 88% | 2602 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 52,968 psi | 85% | 2549 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 48,211 psi | 77% | 2569 fps | 96% |
| Ramshot Hunter | <<locked>> | 94% | 53,113 psi | 85% | 2602 fps | 99.6% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 42,844 psi | 69% | 2461 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,854 psi | 59% | 1588 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 54,172 psi | 87% | 2536 fps | 99.5% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 54,172 psi | 87% | 2602 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 53,751 psi | 86% | 2635 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 55,259 psi | 89% | 2635 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 54,056 psi | 87% | 2661 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 39,436 psi | 63% | 2470 fps | 96.2% |
| Rottweil R 902 | <<locked>> | 84% | 54,215 psi | 87% | 2487 fps | 100% |
| Rottweil R 903 | <<locked>> | 88% | 53,795 psi | 86% | 2533 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 55,100 psi | 88% | 2575 fps | 97.3% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 55,027 psi | 88% | 2628 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 90% | 53,316 psi | 85% | 2520 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 92% | 54,824 psi | 88% | 2543 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 82% | 54,897 psi | 88% | 2513 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 55,405 psi | 89% | 2520 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 56,072 psi | 90% | 2582 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 55,143 psi | 88% | 2585 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 55,753 psi | 89% | 2546 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 53,258 psi | 85% | 2516 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 54,549 psi | 87% | 2425 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 55,172 psi | 88% | 2428 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 54,636 psi | 88% | 2500 fps | 99.2% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 54,534 psi | 87% | 2625 fps | 98.4% |
| Somchem S335 | <<locked>> | 82% | 54,099 psi | 87% | 2421 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 55,390 psi | 89% | 2533 fps | 100% |
| Somchem S355 | <<locked>> | 88% | 53,882 psi | 86% | 2526 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 53,272 psi | 85% | 2523 fps | 96% |
| Somchem S365 | <<locked>> | 96% | 53,359 psi | 86% | 2602 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 55,651 psi | 89% | 2605 fps | 99.1% |
| Vihtavuori N133 | <<locked>> | 82% | 55,042 psi | 88% | 2408 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 54,447 psi | 87% | 2451 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 54,708 psi | 88% | 2467 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 55,056 psi | 88% | 2503 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 53,098 psi | 85% | 2546 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 47,935 psi | 77% | 2484 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 86% | 56,347 psi | 90% | 2510 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 55,825 psi | 90% | 2602 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 52,025 psi | 83% | 2602 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 52,881 psi | 85% | 2657 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 52,707 psi | 85% | 2520 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 54,694 psi | 88% | 2615 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 41,901 psi | 67% | 2582 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 53,011 psi | 85% | 2520 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 52,214 psi | 84% | 2549 fps | 97.8% |
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% | 48,573 psi | 78% | 2379 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 46,717 psi | 75% | 2382 fps | 97.5% |
| Accurate 3100 | <<locked>> | 88% | 33,127 psi | 53% | 2224 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 45,992 psi | 74% | 2385 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 34,650 psi | 56% | 2264 fps | 97.9% |
| Accurate High Country | <<locked>> | 94% | 43,743 psi | 70% | 2526 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 51,517 psi | 83% | 2493 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 43,772 psi | 70% | 2365 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 90% | 41,104 psi | 66% | 2395 fps | 95% |
| ADI AR 2213 | <<locked>> | 98% | 47,747 psi | 77% | 2539 fps | 95.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 47,587 psi | 76% | 2549 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 41,176 psi | 66% | 2395 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 43,918 psi | 70% | 2385 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 47,094 psi | 76% | 2448 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 34,272 psi | 55% | 2277 fps | 98% |
| Alliant Reloder-17 | 60.6 gr | 80% | 38,377 psi | 62% | 2385 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 90% | 40,698 psi | 65% | 2392 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 40,524 psi | 65% | 2431 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 24,932 psi | 40% | 2057 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 92% | 31,879 psi | 51% | 2257 fps | 95.3% |
| Alliant Reloder-26 | 65.2 gr | 84% | 30,066 psi | 48% | 2257 fps | 95.6% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 51,068 psi | 82% | 2510 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 42,496 psi | 68% | 2470 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 44,048 psi | 71% | 2395 fps | 100% |
| Bofors RP5 | <<locked>> | 94% | 40,524 psi | 65% | 2431 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 39,088 psi | 63% | 2280 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 80% | 44,498 psi | 71% | 2402 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 80% | 36,680 psi | 59% | 2306 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 80% | 39,711 psi | 64% | 2323 fps | 95.2% |
| Hodgdon H4831 | <<locked>> | 98% | 50,952 psi | 82% | 2543 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 98% | 50,082 psi | 80% | 2530 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 52,054 psi | 83% | 2500 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 31,691 psi | 51% | 2182 fps | 98.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,544 psi | 78% | 2487 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 38,232 psi | 61% | 2369 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,122 psi | 43% | 1385 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 49,763 psi | 80% | 2457 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 52,402 psi | 84% | 2477 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 46,035 psi | 74% | 2392 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 48,167 psi | 77% | 2415 fps | 98.4% |
| IMR 4350 | <<locked>> | 82% | 37,159 psi | 60% | 2264 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 40,567 psi | 65% | 2310 fps | 96.7% |
| IMR 4831 | <<locked>> | 80% | 33,446 psi | 54% | 2224 fps | 97.6% |
| IMR 4895 | <<locked>> | 80% | 48,254 psi | 77% | 2470 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 49,864 psi | 80% | 2490 fps | 95.5% |
| Lovex D073.6 | <<locked>> | 80% | 51,387 psi | 82% | 2467 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 50,676 psi | 81% | 2428 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 46,166 psi | 74% | 2392 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 38,029 psi | 61% | 2264 fps | 97.4% |
| Lovex S070 | <<locked>> | 80% | 36,361 psi | 58% | 2247 fps | 95.8% |
| Lovex S071 | <<locked>> | 92% | 31,937 psi | 51% | 2198 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 50,343 psi | 81% | 2444 fps | 100% |
| Norma 202 | <<locked>> | 80% | 50,836 psi | 82% | 2441 fps | 100% |
| Norma 203B | <<locked>> | 80% | 46,441 psi | 74% | 2434 fps | 100% |
| Norma 204 | <<locked>> | 86% | 41,626 psi | 67% | 2388 fps | 95.1% |
| Norma MRP | <<locked>> | 90% | 37,173 psi | 60% | 2392 fps | 95.6% |
| Norma URP | <<locked>> | 80% | 34,751 psi | 56% | 2264 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 80% | 46,296 psi | 74% | 2451 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 44,962 psi | 72% | 2513 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 33,634 psi | 54% | 2247 fps | 95.6% |
| Ramshot Magnum | <<locked>> | 98% | 39,943 psi | 64% | 2405 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,470 psi | 44% | 1414 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 44,672 psi | 72% | 2388 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 50,546 psi | 81% | 2549 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 40,785 psi | 65% | 2434 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 34,185 psi | 55% | 2277 fps | 97.4% |
| ReloadSwiss RS 70 | 61.5 gr | 80% | 33,547 psi | 54% | 2280 fps | 96.6% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 36,956 psi | 59% | 2411 fps | 95.1% |
| Rottweil R 902 | <<locked>> | 80% | 48,008 psi | 77% | 2402 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 41,611 psi | 67% | 2349 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 45,542 psi | 73% | 2428 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 90% | 39,581 psi | 63% | 2372 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 39,088 psi | 63% | 2280 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 38,029 psi | 61% | 2264 fps | 97.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 51,387 psi | 82% | 2467 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 46,166 psi | 74% | 2392 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 36,361 psi | 58% | 2247 fps | 95.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 42,583 psi | 68% | 2395 fps | 99.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 52,214 psi | 84% | 2497 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 49,951 psi | 80% | 2470 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 51,227 psi | 82% | 2379 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 43,149 psi | 69% | 2267 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 37,231 psi | 60% | 2215 fps | 95.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 41,785 psi | 67% | 2418 fps | 95.7% |
| Somchem S335 | <<locked>> | 80% | 50,966 psi | 82% | 2382 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 51,967 psi | 83% | 2487 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 41,989 psi | 67% | 2346 fps | 99.9% |
| Somchem S361 | <<locked>> | 94% | 49,734 psi | 80% | 2470 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 31,212 psi | 50% | 2224 fps | 99.4% |
| Somchem S385 | <<locked>> | 88% | 37,637 psi | 60% | 2310 fps | 95.3% |
| Vihtavuori N133 | <<locked>> | 80% | 51,764 psi | 83% | 2369 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 48,008 psi | 77% | 2369 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 48,414 psi | 78% | 2385 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 40,147 psi | 64% | 2287 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 36,071 psi | 58% | 2260 fps | 98.1% |
| Vihtavuori N165 | <<locked>> | 94% | 39,523 psi | 63% | 2339 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 46,485 psi | 75% | 2379 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 35,433 psi | 57% | 2260 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 80% | 27,006 psi | 43% | 2123 fps | 95.6% |
| Vihtavuori N560 | <<locked>> | 98% | 49,472 psi | 79% | 2602 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 35,302 psi | 57% | 2238 fps | 99.5% |
| Winchester 760 | <<locked>> | 80% | 36,854 psi | 59% | 2310 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 84% | 24,860 psi | 40% | 2126 fps | 96% |
| Winchester StaBALL Match | <<locked>> | 80% | 49,705 psi | 80% | 2474 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 42,409 psi | 68% | 2395 fps | 95.5% |
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 105 powders for .338 Win Mag. loaded with the .338 | 250gr | A-Square MONO RN. Alliant Reloder-26 delivers the highest muzzle velocity at 2,707 fps; across all powders the maximum-charge window runs from 1,549 fps to 2,707 fps. Accurate 3100 gives the best case fill at 100 %, and 105 of the 105 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. Accurate 3100, Accurate High Country, 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-17, Alliant Reloder-26 rank at the top here: for .338 Win Mag. with the .338 | 250gr | A-Square MONO RN 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.