Load Specifications
Bullet Manufacturer:Berger
Bullet Weight:250 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338 Blaser Mag. load data
Case Length (l3):2.5078"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:92.6 Grains of Water
Primer Size:Large Rifle Magnum (LRM)
Barrel Length:25.6"
Max. allowed Pressure:60,916 psi
Recommended Twist Rate:1:11.5
Load data in caliber .338 Blaser Mag. with .338 | 250gr | Berger Hybrid OTM bullet and 106 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-16 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.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 84% | 52,460 psi | 86% | 2454 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 54,244 psi | 89% | 2516 fps | 98.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 46,209 psi | 76% | 2493 fps | 99% |
| Accurate 4064 | <<locked>> | 86% | 52,591 psi | 86% | 2503 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 52,301 psi | 86% | 2595 fps | 100% |
| Accurate High Countryᴾ | <<locked>> | 100% | 50,314 psi | 83% | 2671 fps | 97% |
| ADI AR 2206H | <<locked>> | 82% | 52,431 psi | 86% | 2530 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 53,374 psi | 88% | 2533 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 53,853 psi | 88% | 2635 fps | 98.2% |
| ADI Benchmark 8208 | <<locked>> | 82% | 54,636 psi | 90% | 2523 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 51,866 psi | 85% | 2644 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 53,461 psi | 88% | 2628 fps | 98.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 88% | 53,722 psi | 88% | 2552 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 86% | 54,056 psi | 89% | 2572 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 96% | 53,490 psi | 88% | 2648 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 92% | 54,433 psi | 89% | 2671 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 52,663 psi | 86% | 2621 fps | 98.1% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 46,398 psi | 76% | 2569 fps | 97.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,642 psi | 72% | 2520 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,508 psi | 63% | 2444 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 49,284 psi | 81% | 2687 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 52,040 psi | 85% | 2546 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 42,656 psi | 70% | 2503 fps | 96% |
| Bofors RP3 | <<locked>> | 88% | 54,404 psi | 89% | 2569 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 46,398 psi | 76% | 2569 fps | 97.1% |
| Bofors RP7 | <<locked>> | 92% | 54,143 psi | 89% | 2552 fps | 98.9% |
| Hodgdon BL-C2 | <<locked>> | 82% | 53,969 psi | 89% | 2552 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 54,940 psi | 90% | 2585 fps | 100% |
| Hodgdon H414 | <<locked>> | 94% | 54,897 psi | 90% | 2644 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 90% | 51,837 psi | 85% | 2556 fps | 98.2% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 51,459 psi | 84% | 2572 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 82% | 52,968 psi | 87% | 2536 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 98% | 53,534 psi | 88% | 2575 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 52,460 psi | 86% | 2569 fps | 100% |
| Hodgdon Superformance | <<locked>> | 94% | 54,984 psi | 90% | 2680 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,100 psi | 59% | 1549 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,041 psi | 89% | 2539 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,359 psi | 88% | 2513 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 52,968 psi | 87% | 2516 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 52,417 psi | 86% | 2500 fps | 99.1% |
| IMR 4350 | <<locked>> | 96% | 54,404 psi | 89% | 2579 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 90% | 52,475 psi | 86% | 2533 fps | 99% |
| IMR 4831 | <<locked>> | 96% | 52,997 psi | 87% | 2589 fps | 100% |
| IMR 4895 | <<locked>> | 84% | 52,040 psi | 85% | 2552 fps | 100% |
| IMR 4955 Enduronᴾ | <<locked>> | 100% | 53,592 psi | 88% | 2569 fps | 96.5% |
| IMR 8208 XBR | <<locked>> | 82% | 54,636 psi | 90% | 2523 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 52,257 psi | 86% | 2503 fps | 100% |
| Lovex S060 | <<locked>> | 84% | 54,984 psi | 90% | 2507 fps | 100% |
| Lovex S062 | <<locked>> | 86% | 52,924 psi | 87% | 2510 fps | 100% |
| Lovex S065 | <<locked>> | 92% | 52,359 psi | 86% | 2530 fps | 99.7% |
| Lovex S070 | <<locked>> | 94% | 53,171 psi | 87% | 2562 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,537 psi | 63% | 2365 fps | 97.6% |
| Norma 201 | <<locked>> | 84% | 54,505 psi | 89% | 2523 fps | 100% |
| Norma 202 | <<locked>> | 84% | 55,085 psi | 90% | 2516 fps | 100% |
| Norma 203B | <<locked>> | 86% | 53,316 psi | 88% | 2559 fps | 100% |
| Norma 204 | <<locked>> | 96% | 54,926 psi | 90% | 2628 fps | 98.2% |
| Norma MRPᴾ | <<locked>> | 100% | 48,834 psi | 80% | 2644 fps | 98.8% |
| Norma URP | <<locked>> | 96% | 54,911 psi | 90% | 2631 fps | 100% |
| Ramshot Big Game | <<locked>> | 86% | 53,867 psi | 88% | 2589 fps | 100% |
| Ramshot Hunter | <<locked>> | 96% | 53,388 psi | 88% | 2631 fps | 99.7% |
| Ramshot TAC | <<locked>> | 82% | 54,563 psi | 90% | 2552 fps | 99.9% |
| Ramshot Wild Boar | <<locked>> | 82% | 54,346 psi | 89% | 2562 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,593 psi | 60% | 1585 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 54,998 psi | 90% | 2569 fps | 99.6% |
| ReloadSwiss RS 52 | <<locked>> | 84% | 54,694 psi | 90% | 2635 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 90% | 54,186 psi | 89% | 2667 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 51,982 psi | 85% | 2618 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 54,665 psi | 90% | 2694 fps | 100% |
| Rottweil R 902 | <<locked>> | 86% | 55,056 psi | 90% | 2520 fps | 100% |
| Rottweil R 903 | <<locked>> | 90% | 54,302 psi | 89% | 2562 fps | 100% |
| Rottweil R 904 | <<locked>> | 98% | 52,156 psi | 86% | 2556 fps | 96.8% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 51,648 psi | 85% | 2605 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 92% | 54,143 psi | 89% | 2552 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 92% | 52,359 psi | 86% | 2530 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 82% | 52,257 psi | 86% | 2503 fps | 100% |
| Shooters World Precision | <<locked>> | 86% | 52,924 psi | 87% | 2510 fps | 100% |
| Shooters World SW4350 | <<locked>> | 94% | 53,171 psi | 87% | 2562 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 52,417 psi | 86% | 2575 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 53,287 psi | 87% | 2533 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 53,983 psi | 89% | 2549 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 52,359 psi | 86% | 2415 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 52,779 psi | 87% | 2418 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 52,127 psi | 86% | 2487 fps | 99% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 51,169 psi | 84% | 2602 fps | 98% |
| Somchem S335 | <<locked>> | 82% | 51,895 psi | 85% | 2415 fps | 100% |
| Somchem S341 | <<locked>> | 82% | 52,982 psi | 87% | 2523 fps | 100% |
| Somchem S355 | <<locked>> | 90% | 54,418 psi | 89% | 2559 fps | 100% |
| Somchem S361 | <<locked>> | 98% | 53,911 psi | 89% | 2552 fps | 96.2% |
| Somchem S365 | <<locked>> | 98% | 53,243 psi | 87% | 2628 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 52,446 psi | 86% | 2585 fps | 98.8% |
| Vihtavuori N133 | <<locked>> | 82% | 52,823 psi | 87% | 2398 fps | 100% |
| Vihtavuori N135 | <<locked>> | 84% | 51,837 psi | 85% | 2441 fps | 100% |
| Vihtavuori N140 | <<locked>> | 84% | 52,214 psi | 86% | 2457 fps | 100% |
| Vihtavuori N150 | <<locked>> | 90% | 52,373 psi | 86% | 2493 fps | 100% |
| Vihtavuori N160 | <<locked>> | 94% | 53,679 psi | 88% | 2579 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 45,092 psi | 74% | 2461 fps | 97.1% |
| Vihtavuori N530 | <<locked>> | 82% | 55,013 psi | 90% | 2523 fps | 100% |
| Vihtavuori N540 | <<locked>> | 86% | 53,708 psi | 88% | 2500 fps | 100% |
| Vihtavuori N550 | <<locked>> | 94% | 52,707 psi | 87% | 2585 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 48,689 psi | 80% | 2589 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 49,588 psi | 81% | 2631 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 94% | 53,316 psi | 88% | 2552 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 51,677 psi | 85% | 2598 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,247 psi | 64% | 2559 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,056 psi | 89% | 2559 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 49,066 psi | 81% | 2530 fps | 97.3% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 46,137 psi | 76% | 2372 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 44,657 psi | 73% | 2369 fps | 97.1% |
| Accurate 3100 | <<locked>> | 88% | 30,922 psi | 51% | 2208 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 43,700 psi | 72% | 2375 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 32,532 psi | 53% | 2251 fps | 97.5% |
| Accurate High Country | <<locked>> | 96% | 44,063 psi | 72% | 2566 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 49,197 psi | 81% | 2484 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 41,858 psi | 69% | 2356 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 92% | 41,698 psi | 68% | 2431 fps | 95.4% |
| ADI Benchmark 8208 | <<locked>> | 80% | 51,300 psi | 84% | 2480 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 45,237 psi | 74% | 2539 fps | 99.9% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 41,495 psi | 68% | 2431 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 41,858 psi | 69% | 2375 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 44,831 psi | 74% | 2434 fps | 99.9% |
| Alliant Reloder-16 | 53.6 gr | 80% | 32,576 psi | 53% | 2264 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,347 psi | 60% | 2375 fps | 99.7% |
| Alliant Reloder-19 | <<locked>> | 92% | 41,002 psi | 67% | 2425 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 96% | 40,712 psi | 67% | 2467 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 82% | 25,092 psi | 41% | 2093 fps | 95.9% |
| Alliant Reloder-25 | <<locked>> | 94% | 32,039 psi | 53% | 2293 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 84% | 28,340 psi | 47% | 2241 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 48,631 psi | 80% | 2497 fps | 99.9% |
| Bofors RP15 | <<locked>> | 98% | 40,016 psi | 66% | 2451 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 41,800 psi | 69% | 2385 fps | 100% |
| Bofors RP5 | <<locked>> | 96% | 40,712 psi | 67% | 2467 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 37,376 psi | 61% | 2270 fps | 95.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 50,647 psi | 83% | 2510 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 42,380 psi | 70% | 2392 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 80% | 34,606 psi | 57% | 2290 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 82% | 40,306 psi | 66% | 2362 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 98% | 48,196 psi | 79% | 2523 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 49,705 psi | 82% | 2490 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,008 psi | 49% | 2172 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 45,847 psi | 75% | 2474 fps | 100% |
| Hodgdon Superformance | 62.5 gr | 82% | 36,143 psi | 59% | 2349 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,832 psi | 44% | 1378 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 47,558 psi | 78% | 2448 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 49,864 psi | 82% | 2467 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,005 psi | 72% | 2382 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 46,224 psi | 76% | 2405 fps | 98.2% |
| IMR 4350 | <<locked>> | 84% | 37,536 psi | 62% | 2297 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 38,682 psi | 64% | 2297 fps | 96.3% |
| IMR 4831 | <<locked>> | 80% | 31,488 psi | 52% | 2211 fps | 97.2% |
| IMR 4895 | <<locked>> | 80% | 45,934 psi | 75% | 2461 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 47,195 psi | 77% | 2470 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 51,300 psi | 84% | 2480 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 48,979 psi | 80% | 2461 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 48,689 psi | 80% | 2418 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 44,077 psi | 72% | 2382 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 36,303 psi | 60% | 2254 fps | 97.1% |
| Lovex S070 | <<locked>> | 80% | 34,490 psi | 57% | 2234 fps | 95.4% |
| Lovex S071 | <<locked>> | 94% | 31,807 psi | 52% | 2228 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 48,167 psi | 79% | 2434 fps | 100% |
| Norma 202 | <<locked>> | 80% | 48,660 psi | 80% | 2431 fps | 100% |
| Norma 203B | <<locked>> | 80% | 44,179 psi | 73% | 2425 fps | 100% |
| Norma 204 | <<locked>> | 88% | 42,264 psi | 69% | 2425 fps | 95.5% |
| Norma MRP | <<locked>> | 90% | 35,114 psi | 58% | 2379 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 32,735 psi | 54% | 2251 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 80% | 44,005 psi | 72% | 2444 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 80% | 31,836 psi | 52% | 2238 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 51,126 psi | 84% | 2503 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 51,053 psi | 84% | 2520 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,354 psi | 45% | 1414 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 42,569 psi | 70% | 2375 fps | 98% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 47,834 psi | 79% | 2536 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,638 psi | 63% | 2425 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 32,140 psi | 53% | 2267 fps | 97% |
| ReloadSwiss RS 70 | 58.6 gr | 80% | 31,908 psi | 52% | 2270 fps | 96.2% |
| Rottweil R 902 | <<locked>> | 80% | 45,861 psi | 75% | 2392 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 39,378 psi | 65% | 2336 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 94% | 46,021 psi | 76% | 2461 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 92% | 39,885 psi | 65% | 2408 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 37,376 psi | 61% | 2270 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,303 psi | 60% | 2254 fps | 97.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 48,979 psi | 80% | 2461 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 44,077 psi | 72% | 2382 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 34,490 psi | 57% | 2234 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,321 psi | 66% | 2385 fps | 99.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 49,734 psi | 82% | 2484 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 47,616 psi | 78% | 2457 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 49,269 psi | 81% | 2372 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 41,350 psi | 68% | 2260 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 35,418 psi | 58% | 2201 fps | 95.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 39,523 psi | 65% | 2405 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 48,950 psi | 80% | 2375 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 49,501 psi | 81% | 2474 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 39,972 psi | 66% | 2336 fps | 99.9% |
| Somchem S361 | <<locked>> | 96% | 50,401 psi | 83% | 2500 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 29,385 psi | 48% | 2211 fps | 99.2% |
| Somchem S385 | <<locked>> | 90% | 37,869 psi | 62% | 2343 fps | 95.7% |
| Vihtavuori N133 | <<locked>> | 80% | 49,705 psi | 82% | 2359 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 45,788 psi | 75% | 2359 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 46,108 psi | 76% | 2375 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 38,058 psi | 62% | 2277 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 34,069 psi | 56% | 2247 fps | 97.7% |
| Vihtavuori N165 | <<locked>> | 96% | 39,740 psi | 65% | 2369 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 51,547 psi | 85% | 2477 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 44,454 psi | 73% | 2372 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 33,591 psi | 55% | 2254 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 80% | 25,324 psi | 42% | 2110 fps | 95.1% |
| Vihtavuori N560 | <<locked>> | 98% | 46,499 psi | 76% | 2579 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,547 psi | 55% | 2228 fps | 99.3% |
| Winchester 760 | <<locked>> | 80% | 34,751 psi | 57% | 2293 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 84% | 23,525 psi | 39% | 2113 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,369 psi | 78% | 2464 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 40,074 psi | 66% | 2375 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 106 powders for .338 Blaser Mag. loaded with the .338 | 250gr | Berger Hybrid OTM. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,694 fps; across all powders the maximum-charge window runs from 1,549 fps to 2,694 fps. Accurate 3100 gives the best case fill at 100 %, and 106 of the 106 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate High Country, ADI AR 2209 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-16, Hodgdon Superformance rank at the top here: for .338 Blaser Mag. with the .338 | 250gr | Berger Hybrid OTM 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.