Load Specifications
Load data in caliber .338 Blaser Mag. with .338 | 250gr | Woodleigh RN SN bullet and 90 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Ramshot Grand and Norma MRP.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 82% | 54,302 psi | 89% | 2507 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 53,214 psi | 87% | 2539 fps | 99.1% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,692 psi | 87% | 2625 fps | 99.9% |
| Accurate 4064 | <<locked>> | 84% | 54,694 psi | 90% | 2559 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 51,605 psi | 85% | 2618 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 54,781 psi | 90% | 2592 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 52,634 psi | 86% | 2661 fps | 98.6% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,592 psi | 88% | 2707 fps | 97.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 53,925 psi | 89% | 2710 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 52,286 psi | 86% | 2569 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 52,431 psi | 86% | 2585 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 52,504 psi | 86% | 2671 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,316 psi | 88% | 2690 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 51,953 psi | 85% | 2651 fps | 98.6% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,315 psi | 86% | 2703 fps | 98.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,414 psi | 81% | 2638 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,163 psi | 71% | 2579 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 98% | 52,779 psi | 87% | 2769 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,124 psi | 79% | 2638 fps | 98% |
| Bofors RP3 | <<locked>> | 84% | 52,794 psi | 87% | 2582 fps | 100% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,315 psi | 86% | 2703 fps | 98.8% |
| Bofors RP7 | <<locked>> | 88% | 52,344 psi | 86% | 2569 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 84% | 53,214 psi | 87% | 2598 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 54,940 psi | 90% | 2684 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 90% | 52,199 psi | 86% | 2605 fps | 98.8% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 49,429 psi | 81% | 2589 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 98% | 52,721 psi | 87% | 2638 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 52,678 psi | 86% | 2595 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 84% | 54,679 psi | 90% | 2631 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,221 psi | 69% | 2608 fps | 97.4% |
| Hodgdon Superformance | <<locked>> | 90% | 53,476 psi | 88% | 2700 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,361 psi | 60% | 1594 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 54,360 psi | 89% | 2582 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 53,751 psi | 88% | 2549 fps | 100% |
| IMR 4064 | <<locked>> | 86% | 53,766 psi | 88% | 2566 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 52,808 psi | 87% | 2552 fps | 99.5% |
| IMR 4350 | <<locked>> | 92% | 53,084 psi | 87% | 2602 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,085 psi | 89% | 2598 fps | 99.6% |
| IMR 4831 | <<locked>> | 96% | 53,113 psi | 87% | 2625 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 53,766 psi | 88% | 2612 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 52,315 psi | 86% | 2595 fps | 97.1% |
| IMR 7828 SSC | <<locked>> | 98% | 51,474 psi | 85% | 2687 fps | 97.5% |
| Lovex S062 | <<locked>> | 84% | 54,563 psi | 90% | 2569 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,056 psi | 89% | 2592 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 55,114 psi | 90% | 2631 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 43,961 psi | 72% | 2493 fps | 99.1% |
| Norma 203B | <<locked>> | 84% | 55,056 psi | 90% | 2621 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,693 psi | 88% | 2654 fps | 98.6% |
| Norma MRP | <<locked>> | 98% | 51,851 psi | 85% | 2730 fps | 99.6% |
| Norma URP | <<locked>> | 92% | 53,766 psi | 88% | 2651 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 52,228 psi | 86% | 2598 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,998 psi | 90% | 2753 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 92% | 52,605 psi | 86% | 2657 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 51,329 psi | 84% | 2671 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,043 psi | 61% | 1631 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 53,200 psi | 87% | 2585 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 52,881 psi | 87% | 2680 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,969 psi | 90% | 2690 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,417 psi | 88% | 2717 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 42,003 psi | 69% | 2605 fps | 98.4% |
| Rottweil R 902 | <<locked>> | 82% | 53,316 psi | 88% | 2533 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 52,881 psi | 87% | 2575 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,259 psi | 89% | 2631 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 98% | 54,476 psi | 89% | 2687 fps | 99% |
| Rottweil R 907 | <<locked>> | 88% | 52,344 psi | 86% | 2569 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,056 psi | 89% | 2592 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 54,563 psi | 90% | 2569 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,114 psi | 90% | 2631 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,433 psi | 89% | 2635 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,157 psi | 89% | 2467 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,534 psi | 88% | 2549 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 53,983 psi | 89% | 2680 fps | 99% |
| Somchem S355 | <<locked>> | 86% | 52,968 psi | 87% | 2572 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 52,388 psi | 86% | 2575 fps | 96.8% |
| Somchem S365 | <<locked>> | 94% | 52,924 psi | 87% | 2651 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 51,605 psi | 85% | 2615 fps | 99.2% |
| Unknown powder | <<locked>> | 90% | 54,563 psi | 90% | 2657 fps | 100% |
| Vihtavuori N135 | <<locked>> | 82% | 53,519 psi | 88% | 2490 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,621 psi | 88% | 2507 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,099 psi | 89% | 2549 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 52,605 psi | 86% | 2598 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,894 psi | 84% | 2589 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 82% | 51,924 psi | 85% | 2510 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 54,998 psi | 90% | 2651 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 51,938 psi | 85% | 2661 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 52,272 psi | 86% | 2717 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 51,909 psi | 85% | 2569 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 54,940 psi | 90% | 2684 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,657 psi | 73% | 2700 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 53,258 psi | 87% | 2631 fps | 98.7% |
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% | 51,097 psi | 84% | 2464 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 43,787 psi | 72% | 2392 fps | 97.7% |
| Accurate 3100 | <<locked>> | 84% | 30,777 psi | 51% | 2228 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 48,428 psi | 80% | 2474 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,753 psi | 60% | 2365 fps | 99% |
| ADI AR 2208 | <<locked>> | 80% | 45,687 psi | 75% | 2454 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 38,130 psi | 63% | 2398 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 94% | 44,005 psi | 72% | 2543 fps | 95.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,125 psi | 82% | 2651 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,122 psi | 76% | 2477 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,284 psi | 81% | 2539 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 35,940 psi | 59% | 2375 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,596 psi | 67% | 2490 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 37,724 psi | 62% | 2395 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 90% | 37,724 psi | 62% | 2441 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,368 psi | 43% | 2162 fps | 97.4% |
| Alliant Reloder-25 | <<locked>> | 88% | 29,747 psi | 49% | 2267 fps | 95.6% |
| Alliant Reloder-26 | 65.4 gr | 80% | 27,804 psi | 46% | 2257 fps | 95.6% |
| Bofors RP15 | <<locked>> | 92% | 37,231 psi | 61% | 2428 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 46,267 psi | 76% | 2487 fps | 100% |
| Bofors RP5 | <<locked>> | 90% | 37,724 psi | 62% | 2441 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 41,002 psi | 67% | 2379 fps | 97.2% |
| Hodgdon H380 | <<locked>> | 80% | 46,731 psi | 77% | 2500 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 41,974 psi | 69% | 2474 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 80% | 38,392 psi | 63% | 2359 fps | 95.8% |
| Hodgdon H4831 | <<locked>> | 98% | 46,528 psi | 76% | 2539 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 46,151 psi | 76% | 2533 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,446 psi | 55% | 2277 fps | 99.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 48,008 psi | 79% | 2539 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 37,289 psi | 61% | 2497 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 37,536 psi | 62% | 2418 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,209 psi | 45% | 1424 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 48,167 psi | 79% | 2490 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 50,589 psi | 83% | 2507 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 44,904 psi | 74% | 2434 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,106 psi | 72% | 2411 fps | 98.4% |
| IMR 4350 | <<locked>> | 80% | 36,521 psi | 60% | 2310 fps | 96% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,380 psi | 70% | 2405 fps | 98% |
| IMR 4831 | <<locked>> | 80% | 32,126 psi | 53% | 2254 fps | 98% |
| IMR 4895 | <<locked>> | 80% | 50,517 psi | 83% | 2566 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 46,064 psi | 76% | 2493 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 92% | 42,076 psi | 69% | 2520 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 48,196 psi | 79% | 2477 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 39,914 psi | 66% | 2362 fps | 98.6% |
| Lovex S070 | <<locked>> | 80% | 38,043 psi | 62% | 2343 fps | 97.2% |
| Lovex S071 | <<locked>> | 88% | 29,950 psi | 49% | 2208 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 48,631 psi | 80% | 2530 fps | 100% |
| Norma 204 | <<locked>> | 82% | 38,319 psi | 63% | 2385 fps | 95.2% |
| Norma MRP | 68.3 gr | 86% | 34,563 psi | 57% | 2398 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 36,550 psi | 60% | 2359 fps | 98.9% |
| Ramshot Big Game | <<locked>> | 80% | 48,689 psi | 80% | 2549 fps | 100% |
| Ramshot Grand | 73.7 gr | 90% | 41,017 psi | 67% | 2510 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 35,462 psi | 58% | 2352 fps | 97.2% |
| Ramshot Magnum | <<locked>> | 90% | 35,462 psi | 58% | 2379 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,731 psi | 46% | 1457 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 46,688 psi | 77% | 2487 fps | 99.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,149 psi | 71% | 2533 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,405 psi | 60% | 2385 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 35,331 psi | 58% | 2388 fps | 98.2% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 34,214 psi | 56% | 2418 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 50,082 psi | 82% | 2487 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 43,627 psi | 72% | 2441 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 42,148 psi | 69% | 2431 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 86% | 36,695 psi | 60% | 2379 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 41,002 psi | 67% | 2379 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 39,914 psi | 66% | 2362 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 48,196 psi | 79% | 2477 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,043 psi | 62% | 2343 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,773 psi | 74% | 2493 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,136 psi | 74% | 2349 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 38,957 psi | 64% | 2310 fps | 97.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 36,347 psi | 60% | 2372 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 44,121 psi | 72% | 2441 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 46,021 psi | 76% | 2474 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 32,996 psi | 54% | 2323 fps | 100% |
| Somchem S385 | <<locked>> | 84% | 35,041 psi | 58% | 2316 fps | 95.4% |
| Unknown powder | <<locked>> | 80% | 39,465 psi | 65% | 2411 fps | 99% |
| Vihtavuori N135 | <<locked>> | 80% | 50,386 psi | 83% | 2451 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,372 psi | 83% | 2464 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 41,989 psi | 69% | 2372 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,014 psi | 62% | 2359 fps | 99.1% |
| Vihtavuori N165 | <<locked>> | 90% | 36,767 psi | 60% | 2346 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 48,675 psi | 80% | 2464 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,405 psi | 61% | 2362 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 80% | 28,877 psi | 47% | 2228 fps | 97.4% |
| Vihtavuori N560 | <<locked>> | 94% | 45,687 psi | 75% | 2608 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,028 psi | 61% | 2333 fps | 99.9% |
| Winchester 760 | <<locked>> | 80% | 41,974 psi | 69% | 2474 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,235 psi | 38% | 2139 fps | 96.3% |
| Winchester Supreme 780 | <<locked>> | 86% | 37,492 psi | 62% | 2365 fps | 95.1% |
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 100 powders for .338 Blaser Mag. loaded with the .338 | 250gr | Woodleigh RN SN. Alliant Reloder-26 delivers the highest muzzle velocity at 2,769 fps; across all powders the maximum-charge window runs from 1,594 fps to 2,769 fps. Accurate 3100 gives the best case fill at 100 %, and 100 of the 100 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 49–90 %, 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, Ramshot Grand, Norma MRP rank at the top here: for .338 Blaser Mag. with the .338 | 250gr | Woodleigh RN SN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2217, Baschieri & Pellagri 109, Bofors RP30 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.