Load Specifications
Load data in caliber .338 Blaser Mag. with .338 | 250gr | Sako Hammerhead bullet and 89 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Vihtavuori N560.
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>> | 82% | 54,389 psi | 89% | 2507 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 52,040 psi | 85% | 2530 fps | 99% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,779 psi | 87% | 2625 fps | 99.9% |
| Accurate 4064 | <<locked>> | 84% | 54,766 psi | 90% | 2559 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 51,648 psi | 85% | 2618 fps | 100% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 54,694 psi | 90% | 2762 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 86% | 54,839 psi | 90% | 2592 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 52,663 psi | 86% | 2661 fps | 98.6% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,838 psi | 88% | 2710 fps | 97.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 53,983 psi | 89% | 2710 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 52,359 psi | 86% | 2569 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 52,504 psi | 86% | 2589 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 52,547 psi | 86% | 2671 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,606 psi | 88% | 2694 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 52,040 psi | 85% | 2654 fps | 98.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,591 psi | 86% | 2710 fps | 98.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,676 psi | 82% | 2641 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,207 psi | 71% | 2579 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 98% | 52,866 psi | 87% | 2772 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,182 psi | 79% | 2638 fps | 98.1% |
| Bofors RP3 | <<locked>> | 84% | 52,866 psi | 87% | 2582 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,591 psi | 86% | 2710 fps | 98.9% |
| Bofors RP7 | <<locked>> | 88% | 52,388 psi | 86% | 2572 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 43,120 psi | 71% | 2520 fps | 96% |
| Hodgdon H380 | <<locked>> | 84% | 53,272 psi | 87% | 2598 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 53,896 psi | 88% | 2671 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 88% | 53,780 psi | 88% | 2631 fps | 99% |
| Hodgdon H4831 | <<locked>> | 98% | 53,882 psi | 88% | 2657 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 98% | 52,736 psi | 87% | 2641 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 52,765 psi | 87% | 2598 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,505 psi | 89% | 2631 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,264 psi | 69% | 2612 fps | 97.5% |
| Hodgdon Superformance | <<locked>> | 90% | 53,809 psi | 88% | 2707 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,477 psi | 60% | 1594 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,302 psi | 89% | 2572 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,519 psi | 88% | 2562 fps | 99.6% |
| IMR 4350 | <<locked>> | 92% | 53,127 psi | 87% | 2605 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,143 psi | 89% | 2598 fps | 99.6% |
| IMR 4831 | <<locked>> | 92% | 52,243 psi | 86% | 2615 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 53,838 psi | 88% | 2612 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,344 psi | 86% | 2598 fps | 97.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,285 psi | 84% | 2684 fps | 97.5% |
| Lovex S062 | <<locked>> | 84% | 54,636 psi | 90% | 2569 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,099 psi | 89% | 2595 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 52,083 psi | 86% | 2589 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,019 psi | 72% | 2493 fps | 99.2% |
| Norma 203B | <<locked>> | 82% | 51,808 psi | 85% | 2575 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,737 psi | 88% | 2654 fps | 98.7% |
| Norma MRP | <<locked>> | 98% | 51,866 psi | 85% | 2730 fps | 99.6% |
| Norma URP | <<locked>> | 92% | 54,056 psi | 89% | 2654 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 52,286 psi | 86% | 2602 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,445 psi | 84% | 2700 fps | 97.8% |
| Ramshot Hunter | <<locked>> | 92% | 52,634 psi | 86% | 2657 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,600 psi | 75% | 2582 fps | 98.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,144 psi | 61% | 1634 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 53,243 psi | 87% | 2585 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 53,171 psi | 87% | 2684 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 55,042 psi | 90% | 2694 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,505 psi | 88% | 2720 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,018 psi | 69% | 2605 fps | 98.4% |
| Rottweil R 902 | <<locked>> | 82% | 53,403 psi | 88% | 2536 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 52,968 psi | 87% | 2579 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,288 psi | 89% | 2631 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 98% | 54,534 psi | 90% | 2687 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 88% | 52,388 psi | 86% | 2572 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,099 psi | 89% | 2595 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 54,636 psi | 90% | 2569 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 52,083 psi | 86% | 2589 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,491 psi | 89% | 2638 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,230 psi | 89% | 2470 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,838 psi | 88% | 2552 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,056 psi | 89% | 2684 fps | 99% |
| Somchem S355 | <<locked>> | 86% | 53,026 psi | 87% | 2575 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 52,402 psi | 86% | 2579 fps | 96.8% |
| Somchem S365 | <<locked>> | 94% | 53,214 psi | 87% | 2657 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 51,866 psi | 85% | 2618 fps | 99.2% |
| Vihtavuori N135 | <<locked>> | 82% | 53,606 psi | 88% | 2493 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,693 psi | 88% | 2510 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,143 psi | 89% | 2549 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 52,649 psi | 86% | 2598 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,908 psi | 84% | 2592 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 82% | 52,011 psi | 85% | 2510 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 51,764 psi | 85% | 2608 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 52,040 psi | 85% | 2664 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 52,344 psi | 86% | 2720 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 51,924 psi | 85% | 2569 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,114 psi | 89% | 2674 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,672 psi | 73% | 2700 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 51,677 psi | 85% | 2612 fps | 98.5% |
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% | 51,184 psi | 84% | 2467 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,776 psi | 80% | 2480 fps | 98.6% |
| Accurate 3100 | <<locked>> | 84% | 30,821 psi | 51% | 2228 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 48,515 psi | 80% | 2477 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,825 psi | 60% | 2369 fps | 99% |
| Accurate MAGPRO | <<locked>> | 96% | 47,616 psi | 78% | 2648 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 45,759 psi | 75% | 2457 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 38,189 psi | 63% | 2402 fps | 95.2% |
| ADI AR 2213 | <<locked>> | 94% | 44,048 psi | 72% | 2546 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,415 psi | 83% | 2657 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,195 psi | 76% | 2480 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,356 psi | 81% | 2543 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,998 psi | 59% | 2379 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,654 psi | 67% | 2490 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 37,956 psi | 62% | 2402 fps | 95.3% |
| Alliant Reloder-22 | <<locked>> | 90% | 37,753 psi | 62% | 2441 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,426 psi | 43% | 2165 fps | 97.5% |
| Alliant Reloder-25 | <<locked>> | 88% | 29,776 psi | 49% | 2270 fps | 95.6% |
| Alliant Reloder-26 | 65.6 gr | 80% | 27,963 psi | 46% | 2260 fps | 95.7% |
| Bofors RP15 | <<locked>> | 92% | 37,449 psi | 61% | 2434 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 46,340 psi | 76% | 2487 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 37,753 psi | 62% | 2441 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 41,060 psi | 67% | 2379 fps | 97.3% |
| Hodgdon H1000 | <<locked>> | 98% | 40,248 psi | 66% | 2464 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 46,804 psi | 77% | 2503 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 38,783 psi | 64% | 2411 fps | 97.3% |
| Hodgdon H4350 | <<locked>> | 80% | 41,640 psi | 68% | 2425 fps | 96.7% |
| Hodgdon H4831 | <<locked>> | 94% | 47,181 psi | 77% | 2552 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 94% | 46,166 psi | 76% | 2533 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,518 psi | 55% | 2280 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 50,981 psi | 84% | 2582 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 37,362 psi | 61% | 2497 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 37,565 psi | 62% | 2421 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,166 psi | 45% | 1421 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,095 psi | 79% | 2484 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,372 psi | 83% | 2516 fps | 99.3% |
| IMR 4350 | <<locked>> | 80% | 36,579 psi | 60% | 2313 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,438 psi | 70% | 2408 fps | 98% |
| IMR 4831 | <<locked>> | 80% | 35,462 psi | 58% | 2326 fps | 98.8% |
| IMR 4895 | <<locked>> | 80% | 50,589 psi | 83% | 2566 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 46,093 psi | 76% | 2497 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 94% | 42,119 psi | 69% | 2520 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 48,283 psi | 79% | 2480 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,972 psi | 66% | 2362 fps | 98.6% |
| Lovex S070 | <<locked>> | 80% | 38,101 psi | 63% | 2346 fps | 97.3% |
| Lovex S071 | <<locked>> | 88% | 29,994 psi | 49% | 2208 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 48,704 psi | 80% | 2530 fps | 100% |
| Norma 204 | <<locked>> | 82% | 38,392 psi | 63% | 2388 fps | 95.2% |
| Norma MRP | 68.4 gr | 86% | 34,592 psi | 57% | 2402 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 36,622 psi | 60% | 2362 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 80% | 48,907 psi | 80% | 2552 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 41,568 psi | 68% | 2523 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 35,549 psi | 58% | 2356 fps | 97.2% |
| Ramshot Magnum | <<locked>> | 94% | 36,912 psi | 61% | 2411 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,673 psi | 45% | 1457 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,746 psi | 77% | 2487 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,207 psi | 71% | 2536 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,463 psi | 60% | 2385 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 35,549 psi | 58% | 2395 fps | 98.3% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 34,229 psi | 56% | 2421 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 50,169 psi | 82% | 2490 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,700 psi | 72% | 2441 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 42,192 psi | 69% | 2431 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 86% | 36,883 psi | 61% | 2382 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 41,060 psi | 67% | 2379 fps | 97.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,972 psi | 66% | 2362 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 48,283 psi | 79% | 2480 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,101 psi | 63% | 2346 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,846 psi | 74% | 2493 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,194 psi | 74% | 2349 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,001 psi | 64% | 2310 fps | 97.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 36,535 psi | 60% | 2379 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 44,193 psi | 73% | 2441 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 46,035 psi | 76% | 2477 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 33,054 psi | 54% | 2323 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 35,085 psi | 58% | 2316 fps | 95.5% |
| Vihtavuori N135 | <<locked>> | 80% | 50,488 psi | 83% | 2454 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,459 psi | 83% | 2467 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,061 psi | 69% | 2375 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,072 psi | 63% | 2359 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 90% | 36,796 psi | 60% | 2346 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 48,733 psi | 80% | 2467 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,463 psi | 62% | 2362 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 80% | 28,935 psi | 48% | 2231 fps | 97.5% |
| Vihtavuori N560 | 74.8 gr | 94% | 45,905 psi | 75% | 2612 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,072 psi | 61% | 2333 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 38,783 psi | 64% | 2411 fps | 97.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,264 psi | 38% | 2139 fps | 96.3% |
| Winchester Supreme 780 | <<locked>> | 90% | 39,363 psi | 65% | 2402 fps | 95.7% |
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 89 powders for .338 Blaser Mag. loaded with the .338 | 250gr | Sako Hammerhead. Alliant Reloder-26 delivers the highest muzzle velocity at 2,772 fps; across all powders the maximum-charge window runs from 1,594 fps to 2,772 fps. Accurate 3100 gives the best case fill at 100 %, and 89 of the 89 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 60–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:6.0 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for .338 Blaser Mag. with the .338 | 250gr | Sako Hammerhead 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.