Load Specifications
Load data in caliber .338 Blaser Mag. with .338 | 300gr | Woodleigh RN SN bullet and 84 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, IMR 7828 SSC 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 2700 | <<locked>> | 84% | 54,143 psi | 89% | 2316 fps | 99.9% |
| Accurate 3100 | <<locked>> | 98% | 54,998 psi | 90% | 2405 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 53,476 psi | 88% | 2388 fps | 100% |
| Accurate MAGPRO | <<locked>> | 98% | 53,795 psi | 88% | 2500 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 82% | 52,620 psi | 86% | 2313 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,273 psi | 89% | 2441 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 96% | 51,721 psi | 85% | 2444 fps | 99% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 43,250 psi | 71% | 2310 fps | 97.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,072 psi | 63% | 2280 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 53,403 psi | 88% | 2329 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,404 psi | 89% | 2438 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 51,764 psi | 85% | 2408 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 53,606 psi | 88% | 2431 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,781 psi | 90% | 2490 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 52,069 psi | 85% | 2415 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,863 psi | 79% | 2421 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 51,619 psi | 85% | 2497 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 54,186 psi | 89% | 2415 fps | 96.7% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,693 psi | 88% | 2477 fps | 99.8% |
| Bofors RP3 | <<locked>> | 82% | 54,143 psi | 89% | 2346 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,772 psi | 72% | 2369 fps | 98.3% |
| Bofors RP5 | <<locked>> | 98% | 54,781 psi | 90% | 2490 fps | 99.9% |
| Bofors RP7 | <<locked>> | 86% | 53,417 psi | 88% | 2346 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 44,396 psi | 73% | 2329 fps | 98.4% |
| Hodgdon H380 | <<locked>> | 82% | 54,418 psi | 89% | 2365 fps | 100% |
| Hodgdon H414 | <<locked>> | 84% | 52,895 psi | 87% | 2408 fps | 100% |
| Hodgdon H4350 | <<locked>> | 88% | 53,490 psi | 88% | 2382 fps | 99.8% |
| Hodgdon H4831ᴾ | <<locked>> | 100% | 54,534 psi | 90% | 2431 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,273 psi | 89% | 2425 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,592 psi | 90% | 2365 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,934 psi | 77% | 2474 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 86% | 51,605 psi | 85% | 2428 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,825 psi | 60% | 1437 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,926 psi | 90% | 2329 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 84% | 53,635 psi | 88% | 2323 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 54,491 psi | 89% | 2382 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,911 psi | 90% | 2365 fps | 100% |
| IMR 4831 | <<locked>> | 94% | 55,056 psi | 90% | 2398 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 53,621 psi | 88% | 2382 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 96% | 53,142 psi | 87% | 2477 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 51,982 psi | 85% | 2323 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 53,229 psi | 87% | 2362 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,979 psi | 80% | 2333 fps | 100% |
| Norma 204 | <<locked>> | 88% | 51,692 psi | 85% | 2385 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 33,605 psi | 55% | 2218 fps | 97.4% |
| Norma MRP | <<locked>> | 96% | 54,389 psi | 89% | 2510 fps | 100% |
| Norma URP | <<locked>> | 88% | 52,228 psi | 86% | 2379 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 52,881 psi | 87% | 2484 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 90% | 54,476 psi | 89% | 2431 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 53,272 psi | 87% | 2464 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,652 psi | 62% | 1473 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,244 psi | 89% | 2356 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,969 psi | 90% | 2438 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 53,185 psi | 87% | 2411 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 51,430 psi | 84% | 2438 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,833 psi | 77% | 2470 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 41,858 psi | 69% | 2372 fps | 96.3% |
| Rottweil R 903 | <<locked>> | 84% | 54,520 psi | 90% | 2343 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 52,504 psi | 86% | 2372 fps | 99% |
| Rottweil R 905 | <<locked>> | 94% | 52,997 psi | 87% | 2421 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 86% | 53,417 psi | 88% | 2346 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 51,982 psi | 85% | 2323 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 53,229 psi | 87% | 2362 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 52,286 psi | 86% | 2352 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,114 psi | 90% | 2234 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,766 psi | 90% | 2326 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 52,547 psi | 86% | 2418 fps | 99.7% |
| Somchem S355 | <<locked>> | 84% | 54,244 psi | 89% | 2339 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 53,679 psi | 88% | 2365 fps | 98.6% |
| Somchem S365 | <<locked>> | 90% | 51,895 psi | 85% | 2379 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 53,650 psi | 88% | 2402 fps | 100% |
| Unknown powder | <<locked>> | 86% | 52,779 psi | 87% | 2379 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 52,127 psi | 86% | 2277 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,143 psi | 89% | 2369 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 52,837 psi | 87% | 2382 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 53,258 psi | 87% | 2379 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,505 psi | 89% | 2438 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,491 psi | 89% | 2510 fps | 99.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 50,024 psi | 82% | 2438 fps | 98.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 43,569 psi | 72% | 2382 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 53,272 psi | 87% | 2339 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 52,895 psi | 87% | 2408 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 51,416 psi | 84% | 2533 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,984 psi | 90% | 2415 fps | 99.8% |
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% | 47,630 psi | 78% | 2231 fps | 99.5% |
| Accurate 3100 | <<locked>> | 80% | 30,313 psi | 50% | 2014 fps | 97.5% |
| Accurate 4350 | <<locked>> | 80% | 41,017 psi | 67% | 2215 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 40,843 psi | 67% | 2297 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 49,472 psi | 81% | 2274 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 34,592 psi | 57% | 2116 fps | 96.1% |
| ADI AR 2213 | <<locked>> | 86% | 37,449 psi | 61% | 2201 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 94% | 35,650 psi | 59% | 2162 fps | 95% |
| ADI AR 2225 | <<locked>> | 90% | 28,050 psi | 46% | 2037 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,227 psi | 82% | 2290 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,624 psi | 65% | 2221 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,063 psi | 74% | 2316 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 34,447 psi | 57% | 2113 fps | 96.2% |
| Alliant Reloder-22 | <<locked>> | 82% | 32,329 psi | 53% | 2110 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,182 psi | 48% | 2037 fps | 99.7% |
| Alliant Reloder-25 | <<locked>> | 80% | 25,715 psi | 42% | 1965 fps | 95.9% |
| Alliant Reloder-26 | 61.8 gr | 80% | 31,241 psi | 51% | 2149 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 48,066 psi | 79% | 2323 fps | 95.3% |
| Bofors RP15 | <<locked>> | 84% | 32,227 psi | 53% | 2106 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 50,850 psi | 83% | 2303 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 33,866 psi | 56% | 2178 fps | 95.4% |
| Bofors RP5 | <<locked>> | 82% | 32,329 psi | 53% | 2110 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 44,440 psi | 73% | 2218 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 92% | 34,345 psi | 56% | 2139 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 50,966 psi | 84% | 2320 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 46,340 psi | 76% | 2313 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 41,887 psi | 69% | 2205 fps | 98.4% |
| Hodgdon H4831 | <<locked>> | 88% | 37,333 psi | 61% | 2156 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 86% | 39,233 psi | 64% | 2192 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,188 psi | 61% | 2126 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 32,198 psi | 53% | 2172 fps | 96% |
| Hodgdon Superformance | <<locked>> | 80% | 41,481 psi | 68% | 2277 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,644 psi | 45% | 1283 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,762 psi | 80% | 2251 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 47,485 psi | 78% | 2238 fps | 99.8% |
| IMR 4350 | <<locked>> | 80% | 40,089 psi | 66% | 2165 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,832 psi | 75% | 2238 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 35,636 psi | 59% | 2110 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 82% | 36,970 psi | 61% | 2113 fps | 95% |
| IMR 7828 SSC | 62 gr | 84% | 35,737 psi | 59% | 2178 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 43,366 psi | 71% | 2198 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 41,597 psi | 68% | 2188 fps | 99.3% |
| Lovex S071 | <<locked>> | 80% | 26,121 psi | 43% | 1913 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 39,479 psi | 65% | 2192 fps | 97.5% |
| Norma 217 | <<locked>> | 96% | 29,733 psi | 49% | 2123 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 31,517 psi | 52% | 2119 fps | 96.8% |
| Norma URP | <<locked>> | 80% | 40,393 psi | 66% | 2205 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 34,345 psi | 56% | 2162 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 39,160 psi | 64% | 2205 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 82% | 29,805 psi | 49% | 2051 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,094 psi | 46% | 1312 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,879 psi | 84% | 2313 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,848 psi | 79% | 2352 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,596 psi | 67% | 2234 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,088 psi | 64% | 2247 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 29,109 psi | 48% | 2096 fps | 95.5% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 39,073 psi | 64% | 2316 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 47,863 psi | 79% | 2260 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 35,984 psi | 59% | 2100 fps | 95.4% |
| Rottweil R 905 | <<locked>> | 80% | 33,504 psi | 55% | 2096 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 80% | 44,440 psi | 73% | 2218 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,366 psi | 71% | 2198 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 41,597 psi | 68% | 2188 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,965 psi | 80% | 2310 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,660 psi | 80% | 2159 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,424 psi | 70% | 2156 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 33,185 psi | 54% | 2093 fps | 96% |
| Somchem S355 | <<locked>> | 80% | 48,022 psi | 79% | 2257 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 38,856 psi | 64% | 2136 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 37,202 psi | 61% | 2172 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,171 psi | 56% | 2087 fps | 97.2% |
| Unknown powder | <<locked>> | 80% | 43,540 psi | 71% | 2251 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 45,818 psi | 75% | 2195 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,959 psi | 69% | 2201 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 29,559 psi | 49% | 1985 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 41,205 psi | 68% | 2205 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 32,532 psi | 53% | 2096 fps | 99.6% |
| Vihtavuori N560 | 63 gr | 84% | 36,521 psi | 60% | 2208 fps | 95% |
| Vihtavuori N565 | <<locked>> | 90% | 35,766 psi | 59% | 2198 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 98% | 40,582 psi | 67% | 2326 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,625 psi | 67% | 2172 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,340 psi | 76% | 2313 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,744 psi | 42% | 2051 fps | 99.8% |
| Winchester Supreme 780 | <<locked>> | 80% | 33,750 psi | 55% | 2080 fps | 95.9% |
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 84 powders for .338 Blaser Mag. loaded with the .338 | 300gr | Woodleigh RN SN. Winchester StaBALL HD delivers the highest muzzle velocity at 2,533 fps; across all powders the maximum-charge window runs from 1,437 fps to 2,533 fps. ADI AR 2217 gives the best case fill at 100 %, and 84 of the 84 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 300.0 gr projectile in 0.338" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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, IMR 7828 SSC, Vihtavuori N560 rank at the top here: for .338 Blaser Mag. with the .338 | 300gr | Woodleigh RN SN 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.