Load Specifications
Load data in caliber .338 Blaser Mag. with .338 | 307gr | Hornady Sub-X bullet and 81 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 MAGPRO and Ramshot Grand.
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 3100 | <<locked>> | 98% | 54,737 psi | 90% | 2372 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 53,301 psi | 88% | 2356 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 52,852 psi | 87% | 2461 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 82% | 52,431 psi | 86% | 2277 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 53,838 psi | 88% | 2405 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 98% | 54,911 psi | 90% | 2454 fps | 99.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 42,917 psi | 70% | 2274 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 37,971 psi | 62% | 2251 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 54,128 psi | 89% | 2405 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 53,214 psi | 87% | 2293 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,027 psi | 89% | 2398 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 55,100 psi | 90% | 2411 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 53,432 psi | 88% | 2398 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 98% | 54,288 psi | 89% | 2451 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 54,969 psi | 90% | 2418 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 47,659 psi | 78% | 2388 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 96% | 55,114 psi | 90% | 2503 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 98% | 53,940 psi | 89% | 2379 fps | 96.8% |
| Bofors RP15ᴾ | <<locked>> | 100% | 53,200 psi | 87% | 2438 fps | 99.8% |
| Bofors RP3 | <<locked>> | 82% | 54,041 psi | 89% | 2310 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 43,627 psi | 72% | 2339 fps | 98.4% |
| Bofors RP5 | <<locked>> | 98% | 54,288 psi | 89% | 2451 fps | 99.9% |
| Bofors RP7 | <<locked>> | 86% | 53,156 psi | 87% | 2310 fps | 99.9% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 47,224 psi | 78% | 2346 fps | 99% |
| Hodgdon H380 | <<locked>> | 82% | 54,172 psi | 89% | 2329 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 51,648 psi | 85% | 2359 fps | 100% |
| Hodgdon H4350 | <<locked>> | 86% | 54,737 psi | 90% | 2365 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 96% | 55,071 psi | 90% | 2402 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 96% | 54,027 psi | 89% | 2388 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 54,462 psi | 89% | 2329 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 46,789 psi | 77% | 2441 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 86% | 51,227 psi | 84% | 2392 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,811 psi | 60% | 1414 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 54,230 psi | 89% | 2343 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 86% | 54,694 psi | 90% | 2329 fps | 100% |
| IMR 4831 | <<locked>> | 90% | 53,751 psi | 88% | 2349 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 53,229 psi | 87% | 2346 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 98% | 52,634 psi | 86% | 2438 fps | 99.2% |
| Lovex S065 | <<locked>> | 88% | 54,984 psi | 90% | 2326 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 53,084 psi | 87% | 2326 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 48,849 psi | 80% | 2300 fps | 100% |
| Norma 204 | <<locked>> | 90% | 54,824 psi | 90% | 2395 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 33,431 psi | 55% | 2185 fps | 97.6% |
| Norma MRP | <<locked>> | 96% | 53,911 psi | 89% | 2474 fps | 100% |
| Norma URP | <<locked>> | 88% | 52,040 psi | 85% | 2343 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 53,011 psi | 87% | 2451 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 90% | 54,012 psi | 89% | 2392 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 50,807 psi | 83% | 2398 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,666 psi | 62% | 1450 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,012 psi | 89% | 2320 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 54,549 psi | 90% | 2398 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 52,953 psi | 87% | 2375 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 54,911 psi | 90% | 2448 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 46,499 psi | 76% | 2434 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 41,553 psi | 68% | 2336 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 84% | 54,143 psi | 89% | 2306 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 52,257 psi | 86% | 2336 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 94% | 52,779 psi | 87% | 2385 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 86% | 53,156 psi | 87% | 2310 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 88% | 54,984 psi | 90% | 2326 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 53,084 psi | 87% | 2326 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 52,025 psi | 85% | 2316 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 54,926 psi | 90% | 2198 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,433 psi | 89% | 2290 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 52,359 psi | 86% | 2382 fps | 99.8% |
| Somchem S355 | <<locked>> | 84% | 54,143 psi | 89% | 2303 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 53,476 psi | 88% | 2329 fps | 98.6% |
| Somchem S365 | <<locked>> | 92% | 55,042 psi | 90% | 2382 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 53,287 psi | 87% | 2362 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 51,808 psi | 85% | 2241 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 53,983 psi | 89% | 2333 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 52,576 psi | 86% | 2346 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 52,982 psi | 87% | 2343 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 54,302 psi | 89% | 2402 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 54,099 psi | 89% | 2470 fps | 99.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 49,647 psi | 82% | 2402 fps | 98.7% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 43,207 psi | 71% | 2346 fps | 96.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 53,171 psi | 87% | 2303 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 51,837 psi | 85% | 2359 fps | 100% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 50,981 psi | 84% | 2493 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 52,982 psi | 87% | 2359 fps | 99.7% |
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 3100 | <<locked>> | 80% | 30,168 psi | 50% | 1985 fps | 97.7% |
| Accurate 4350 | <<locked>> | 80% | 40,799 psi | 67% | 2182 fps | 100% |
| Accurate MAGPRO | 64.1 gr | 86% | 37,507 psi | 62% | 2211 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 49,240 psi | 81% | 2238 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 34,432 psi | 57% | 2083 fps | 96.3% |
| ADI AR 2213 | <<locked>> | 86% | 37,115 psi | 61% | 2165 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 94% | 35,375 psi | 58% | 2129 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 90% | 27,891 psi | 46% | 2008 fps | 95.2% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 34,635 psi | 57% | 2087 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 49,980 psi | 82% | 2254 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,378 psi | 65% | 2188 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 44,788 psi | 74% | 2280 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 34,316 psi | 56% | 2083 fps | 96.4% |
| Alliant Reloder-22 | <<locked>> | 82% | 32,242 psi | 53% | 2083 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,022 psi | 48% | 2008 fps | 99.8% |
| Alliant Reloder-25 | <<locked>> | 80% | 25,599 psi | 42% | 1939 fps | 96.1% |
| Alliant Reloder-26 | 60.3 gr | 80% | 31,082 psi | 51% | 2119 fps | 99.2% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 47,732 psi | 78% | 2287 fps | 95.4% |
| Bofors RP15 | <<locked>> | 84% | 31,995 psi | 53% | 2077 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 50,705 psi | 83% | 2270 fps | 100% |
| Bofors RP30 | <<locked>> | 92% | 33,721 psi | 55% | 2149 fps | 95.5% |
| Bofors RP5 | <<locked>> | 82% | 32,242 psi | 53% | 2083 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 44,222 psi | 73% | 2182 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 90% | 34,040 psi | 56% | 2103 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 50,836 psi | 83% | 2287 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 42,482 psi | 70% | 2221 fps | 99.5% |
| Hodgdon H4350 | <<locked>> | 80% | 45,397 psi | 75% | 2234 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 84% | 37,173 psi | 61% | 2126 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 38,899 psi | 64% | 2159 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 36,956 psi | 61% | 2093 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 86% | 30,052 psi | 49% | 2090 fps | 95% |
| Hodgdon Superformance | <<locked>> | 80% | 41,205 psi | 68% | 2241 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,601 psi | 45% | 1260 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 39,929 psi | 66% | 2133 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,643 psi | 75% | 2205 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 39,030 psi | 64% | 2139 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 36,724 psi | 60% | 2080 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 86% | 35,563 psi | 58% | 2149 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 43,163 psi | 71% | 2162 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 41,408 psi | 68% | 2156 fps | 99.4% |
| Lovex S071 | <<locked>> | 80% | 26,020 psi | 43% | 1886 fps | 96% |
| Norma 204 | <<locked>> | 80% | 39,378 psi | 65% | 2162 fps | 97.6% |
| Norma 217 | <<locked>> | 96% | 29,486 psi | 48% | 2090 fps | 95.8% |
| Norma MRP | <<locked>> | 80% | 31,299 psi | 51% | 2090 fps | 97% |
| Norma URP | <<locked>> | 80% | 40,176 psi | 66% | 2172 fps | 100% |
| Ramshot Grand | 62.4 gr | 86% | 35,027 psi | 57% | 2152 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 39,059 psi | 64% | 2172 fps | 99.5% |
| Ramshot Magnum | <<locked>> | 84% | 28,935 psi | 48% | 2005 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,239 psi | 46% | 1293 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 50,575 psi | 83% | 2277 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 47,529 psi | 78% | 2313 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,364 psi | 66% | 2198 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 38,885 psi | 64% | 2215 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 28,848 psi | 47% | 2064 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 38,783 psi | 64% | 2283 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 47,630 psi | 78% | 2224 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 35,810 psi | 59% | 2067 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 80% | 33,330 psi | 55% | 2067 fps | 96.3% |
| Rottweil R 907 | <<locked>> | 80% | 44,222 psi | 73% | 2182 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,163 psi | 71% | 2162 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 41,408 psi | 68% | 2156 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 48,849 psi | 80% | 2277 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,573 psi | 80% | 2126 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,308 psi | 69% | 2123 fps | 99.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 33,025 psi | 54% | 2064 fps | 96.1% |
| Somchem S355 | <<locked>> | 80% | 47,761 psi | 78% | 2224 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 38,580 psi | 63% | 2103 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 36,999 psi | 61% | 2139 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 34,040 psi | 56% | 2057 fps | 97.3% |
| Vihtavuori N150 | <<locked>> | 80% | 45,614 psi | 75% | 2162 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,771 psi | 69% | 2169 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 29,428 psi | 48% | 1955 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 41,075 psi | 67% | 2175 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 32,445 psi | 53% | 2070 fps | 99.7% |
| Vihtavuori N560 | <<locked>> | 84% | 36,245 psi | 60% | 2175 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 90% | 35,549 psi | 58% | 2165 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 98% | 40,350 psi | 66% | 2293 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,437 psi | 66% | 2139 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 42,670 psi | 70% | 2224 fps | 99.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,686 psi | 42% | 2024 fps | 99.9% |
| Winchester Supreme 780 | <<locked>> | 80% | 30,835 psi | 51% | 1991 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 81 powders for .338 Blaser Mag. loaded with the .338 | 307gr | Hornady Sub-X. Alliant Reloder-26 delivers the highest muzzle velocity at 2,503 fps; across all powders the maximum-charge window runs from 1,414 fps to 2,503 fps. ADI AR 2217 gives the best case fill at 100 %, and 81 of the 81 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 307.0 gr projectile in 0.338" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, 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 MAGPRO, Ramshot Grand rank at the top here: for .338 Blaser Mag. with the .338 | 307gr | Hornady Sub-X 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.