Load Specifications
Load data in caliber .338 Blaser Mag. with .338 | 275gr | Speer SSP bullet and 88 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country 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 2700 | <<locked>> | 82% | 53,751 psi | 88% | 2425 fps | 99.6% |
| Accurate 3100 | <<locked>> | 98% | 51,735 psi | 85% | 2480 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 53,417 psi | 88% | 2405 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 53,954 psi | 89% | 2513 fps | 100% |
| Accurate High Country | <<locked>> | 96% | 52,576 psi | 86% | 2612 fps | 98.7% |
| Accurate MAGPRO | <<locked>> | 98% | 53,476 psi | 88% | 2612 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 84% | 53,388 psi | 88% | 2438 fps | 100% |
| ADI AR 2209 | <<locked>> | 96% | 54,708 psi | 90% | 2559 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 98% | 52,243 psi | 86% | 2559 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 35,911 psi | 59% | 2326 fps | 97.5% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 54,839 psi | 90% | 2559 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 54,215 psi | 89% | 2457 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 54,288 psi | 89% | 2474 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 92% | 54,679 psi | 90% | 2559 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 52,040 psi | 85% | 2530 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 96% | 54,099 psi | 89% | 2552 fps | 99.4% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 54,795 psi | 90% | 2608 fps | 99.6% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 51,837 psi | 85% | 2533 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 45,049 psi | 74% | 2490 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 51,735 psi | 85% | 2618 fps | 100% |
| Baschieri & Pellagri 109ᴾ | <<locked>> | 100% | 55,056 psi | 90% | 2526 fps | 95.8% |
| Bofors RP15ᴾ | <<locked>> | 100% | 50,256 psi | 83% | 2543 fps | 99% |
| Bofors RP3 | <<locked>> | 84% | 55,027 psi | 90% | 2474 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 40,959 psi | 67% | 2425 fps | 96.7% |
| Bofors RP5ᴾ | <<locked>> | 100% | 54,795 psi | 90% | 2608 fps | 99.6% |
| Bofors RP7 | <<locked>> | 88% | 54,172 psi | 89% | 2467 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 44,701 psi | 73% | 2434 fps | 97.5% |
| Hodgdon H380 | <<locked>> | 82% | 51,706 psi | 85% | 2444 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 52,475 psi | 86% | 2516 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 86% | 52,504 psi | 86% | 2480 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 96% | 52,388 psi | 86% | 2507 fps | 97.7% |
| Hodgdon H4831 SC | <<locked>> | 98% | 54,839 psi | 90% | 2543 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 55,071 psi | 90% | 2490 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 44,135 psi | 72% | 2530 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 88% | 52,083 psi | 86% | 2549 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,680 psi | 60% | 1509 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 52,953 psi | 87% | 2421 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 51,808 psi | 85% | 2454 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 52,547 psi | 86% | 2444 fps | 99.8% |
| IMR 4831 | <<locked>> | 92% | 54,302 psi | 89% | 2507 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 96% | 54,157 psi | 89% | 2497 fps | 98.1% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 53,214 psi | 87% | 2585 fps | 98.6% |
| Lovex S062 | <<locked>> | 82% | 53,127 psi | 87% | 2411 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 52,634 psi | 86% | 2441 fps | 100% |
| Lovex S070 | <<locked>> | 90% | 53,940 psi | 89% | 2484 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 45,948 psi | 75% | 2398 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 53,577 psi | 88% | 2464 fps | 100% |
| Norma 204 | <<locked>> | 90% | 52,199 psi | 86% | 2503 fps | 99% |
| Norma MRP | <<locked>> | 98% | 54,505 psi | 89% | 2631 fps | 100% |
| Norma URP | <<locked>> | 90% | 52,750 psi | 87% | 2500 fps | 100% |
| Ramshot Big Game | <<locked>> | 82% | 54,375 psi | 89% | 2490 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 53,766 psi | 88% | 2605 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 92% | 54,955 psi | 90% | 2552 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 47,877 psi | 79% | 2497 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,246 psi | 61% | 1542 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 55,114 psi | 90% | 2480 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 51,677 psi | 85% | 2523 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 53,548 psi | 88% | 2536 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 52,011 psi | 85% | 2562 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 43,961 psi | 72% | 2526 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 82% | 55,100 psi | 90% | 2421 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 51,619 psi | 85% | 2425 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 53,098 psi | 87% | 2487 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 96% | 53,461 psi | 88% | 2539 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 88% | 54,172 psi | 89% | 2467 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 52,634 psi | 86% | 2441 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 53,127 psi | 87% | 2411 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 53,940 psi | 89% | 2484 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 52,997 psi | 87% | 2480 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 52,779 psi | 87% | 2320 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 52,185 psi | 86% | 2402 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 52,997 psi | 87% | 2536 fps | 99.4% |
| Somchem S355 | <<locked>> | 86% | 55,013 psi | 90% | 2464 fps | 100% |
| Somchem S361 | <<locked>> | 94% | 54,375 psi | 89% | 2480 fps | 98% |
| Somchem S365 | <<locked>> | 92% | 52,054 psi | 85% | 2500 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 54,041 psi | 89% | 2516 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 86% | 52,837 psi | 87% | 2398 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 54,752 psi | 90% | 2490 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 53,098 psi | 87% | 2493 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 82% | 53,577 psi | 88% | 2395 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 53,708 psi | 88% | 2500 fps | 100% |
| Vihtavuori N555 | <<locked>> | 98% | 54,418 psi | 89% | 2556 fps | 100% |
| Vihtavuori N560 | <<locked>> | 98% | 54,795 psi | 90% | 2625 fps | 98.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 46,659 psi | 77% | 2497 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 53,998 psi | 89% | 2461 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 52,721 psi | 87% | 2520 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 46,847 psi | 77% | 2602 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 53,882 psi | 88% | 2513 fps | 99.3% |
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 2700 | <<locked>> | 80% | 50,459 psi | 83% | 2379 fps | 99.3% |
| Accurate 3100 | <<locked>> | 80% | 28,355 psi | 47% | 2060 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 50,314 psi | 83% | 2365 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 38,566 psi | 63% | 2280 fps | 99.7% |
| Accurate High Country | 65.7 gr | 86% | 37,304 psi | 61% | 2346 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 92% | 43,352 psi | 71% | 2451 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 47,369 psi | 78% | 2352 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 34,882 psi | 57% | 2218 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 90% | 40,205 psi | 66% | 2352 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 96% | 31,807 psi | 52% | 2224 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 34,983 psi | 57% | 2218 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 47,863 psi | 79% | 2372 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 51,111 psi | 84% | 2434 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 37,376 psi | 61% | 2287 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 42,293 psi | 69% | 2388 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 34,650 psi | 57% | 2215 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 86% | 34,780 psi | 57% | 2260 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 27,514 psi | 45% | 2090 fps | 98.8% |
| Alliant Reloder-25 | <<locked>> | 84% | 27,485 psi | 45% | 2100 fps | 95.6% |
| Alliant Reloder-26 | 63 gr | 80% | 29,283 psi | 48% | 2192 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 51,909 psi | 85% | 2480 fps | 95.1% |
| Bofors RP15 | <<locked>> | 88% | 34,345 psi | 56% | 2251 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 48,211 psi | 79% | 2382 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 36,071 psi | 59% | 2323 fps | 95% |
| Bofors RP5 | <<locked>> | 86% | 34,780 psi | 57% | 2260 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 42,438 psi | 70% | 2287 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 96% | 39,291 psi | 65% | 2333 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 48,428 psi | 80% | 2398 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 40,364 psi | 66% | 2320 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 80% | 43,279 psi | 71% | 2333 fps | 97.9% |
| Hodgdon H4831 | <<locked>> | 90% | 42,917 psi | 70% | 2359 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 90% | 42,163 psi | 69% | 2343 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 35,070 psi | 58% | 2192 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 34,287 psi | 56% | 2313 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 39,073 psi | 64% | 2333 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 45% | 1342 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 49,821 psi | 82% | 2379 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 38,101 psi | 63% | 2228 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 43,816 psi | 72% | 2310 fps | 98.9% |
| IMR 4831 | <<locked>> | 80% | 36,999 psi | 61% | 2238 fps | 99.6% |
| IMR 4955 Enduron | <<locked>> | 88% | 42,395 psi | 70% | 2310 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 92% | 41,147 psi | 68% | 2385 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 50,038 psi | 82% | 2372 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 41,365 psi | 68% | 2267 fps | 99.4% |
| Lovex S070 | <<locked>> | 80% | 39,508 psi | 65% | 2254 fps | 98.4% |
| Lovex S071 | <<locked>> | 84% | 27,847 psi | 46% | 2047 fps | 95.5% |
| Norma 203B | <<locked>> | 80% | 50,473 psi | 83% | 2421 fps | 100% |
| Norma 204 | <<locked>> | 80% | 37,434 psi | 61% | 2254 fps | 95.9% |
| Norma MRP | 62.6 gr | 82% | 31,575 psi | 52% | 2215 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 38,159 psi | 63% | 2270 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 80% | 50,749 psi | 83% | 2444 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 37,942 psi | 62% | 2333 fps | 95.1% |
| Ramshot Hunter | <<locked>> | 80% | 37,028 psi | 61% | 2267 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 90% | 33,518 psi | 55% | 2228 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,905 psi | 46% | 1378 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 48,399 psi | 79% | 2385 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 44,933 psi | 74% | 2428 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 38,232 psi | 63% | 2297 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 36,970 psi | 61% | 2310 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 31,241 psi | 51% | 2238 fps | 95.2% |
| Rottweil R 902 | <<locked>> | 80% | 51,909 psi | 85% | 2379 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 45,426 psi | 75% | 2339 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 38,624 psi | 63% | 2247 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 82% | 33,736 psi | 55% | 2198 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 42,438 psi | 70% | 2287 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 41,365 psi | 68% | 2267 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 50,038 psi | 82% | 2372 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 39,508 psi | 65% | 2254 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 46,557 psi | 76% | 2388 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 46,659 psi | 77% | 2241 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 40,422 psi | 66% | 2221 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 33,460 psi | 55% | 2195 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 45,730 psi | 75% | 2336 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 41,959 psi | 69% | 2290 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 34,795 psi | 57% | 2238 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 32,155 psi | 53% | 2139 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 43,584 psi | 72% | 2274 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 39,682 psi | 65% | 2270 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 33,794 psi | 55% | 2172 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 50,299 psi | 83% | 2356 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 38,972 psi | 64% | 2270 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 30,400 psi | 50% | 2152 fps | 98.7% |
| Vihtavuori N560 | <<locked>> | 90% | 41,959 psi | 69% | 2418 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 96% | 40,814 psi | 67% | 2395 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 38,522 psi | 63% | 2241 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 40,538 psi | 67% | 2326 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 24,294 psi | 40% | 2087 fps | 98.5% |
| Winchester Supreme 780 | <<locked>> | 86% | 35,810 psi | 59% | 2218 fps | 95.6% |
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 88 powders for .338 Blaser Mag. loaded with the .338 | 275gr | Speer SSP. Norma MRP delivers the highest muzzle velocity at 2,631 fps; across all powders the maximum-charge window runs from 1,509 fps to 2,631 fps. ADI AR 2225 gives the best case fill at 100 %, and 88 of the 88 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 275.0 gr projectile in 0.338" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-22, Alliant Reloder-23 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, Accurate High Country, Norma MRP rank at the top here: for .338 Blaser Mag. with the .338 | 275gr | Speer SSP 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.