Load Specifications
Bullet:.338 | 250gr | Barnes MRX BT
Bullet Manufacturer:Barnes
Bullet Weight:250 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:8.5 x 55 Blaser load data
Case Length (l3):2.15"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:77 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:23.62"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:14.0
Load data in caliber 8.5 x 55 Blaser with .338 | 250gr | Barnes MRX BT bullet and 106 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR and ReloadSwiss RS 52.
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: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 86% | 53,548 psi | 86% | 2329 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,274 psi | 89% | 2395 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 54,259 psi | 87% | 2385 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 53,403 psi | 86% | 2408 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 54,766 psi | 88% | 2392 fps | 97.1% |
| Accurate 4064 | <<locked>> | 94% | 54,056 psi | 87% | 2425 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 49,908 psi | 80% | 2451 fps | 99.4% |
| Accurate LT-30 | <<locked>> | 82% | 56,318 psi | 90% | 2316 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 55,927 psi | 90% | 2461 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 53,490 psi | 86% | 2415 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 88% | 54,998 psi | 88% | 2415 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 55,535 psi | 89% | 2392 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 53,403 psi | 86% | 2464 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 55,506 psi | 89% | 2569 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 56,260 psi | 90% | 2474 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 53,171 psi | 85% | 2326 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 53,563 psi | 86% | 2451 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,023 psi | 79% | 2457 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 98% | 53,243 psi | 85% | 2539 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,534 psi | 55% | 2228 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 37,913 psi | 61% | 2349 fps | 96.6% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 55,376 psi | 89% | 2320 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 55,666 psi | 89% | 2477 fps | 99.8% |
| Bofors RP3 | <<locked>> | 94% | 53,243 psi | 85% | 2448 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 53,737 psi | 86% | 2418 fps | 97.3% |
| Hodgdon Benchmark | <<locked>> | 86% | 53,650 psi | 86% | 2359 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 53,896 psi | 86% | 2444 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 56,072 psi | 90% | 2533 fps | 100% |
| Hodgdon H322 | <<locked>> | 84% | 55,985 psi | 90% | 2411 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 53,214 psi | 85% | 2392 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 54,679 psi | 88% | 2461 fps | 99.5% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 53,461 psi | 86% | 2500 fps | 98% |
| Hodgdon H4350 | <<locked>> | 98% | 54,882 psi | 88% | 2467 fps | 96.8% |
| Hodgdon H4895 | <<locked>> | 90% | 56,434 psi | 90% | 2470 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,295 psi | 73% | 2356 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,477 psi | 89% | 2500 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 54,868 psi | 88% | 2539 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,954 psi | 56% | 1437 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 54,346 psi | 87% | 2428 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 56,260 psi | 90% | 2451 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 56,362 psi | 90% | 2444 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 53,432 psi | 86% | 2385 fps | 97.7% |
| IMR 4198 | <<locked>> | 82% | 54,012 psi | 87% | 2293 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 50,430 psi | 81% | 2395 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 98% | 56,028 psi | 90% | 2448 fps | 98% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,703 psi | 76% | 2405 fps | 99.2% |
| IMR 4895 | <<locked>> | 92% | 54,911 psi | 88% | 2477 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 54,998 psi | 88% | 2415 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 55,201 psi | 89% | 2408 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 55,259 psi | 89% | 2438 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 55,912 psi | 90% | 2398 fps | 100% |
| Lovex S062 | <<locked>> | 94% | 55,724 psi | 89% | 2438 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 54,781 psi | 88% | 2441 fps | 99% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,069 psi | 83% | 2425 fps | 97.8% |
| Norma 201 | <<locked>> | 90% | 54,505 psi | 87% | 2411 fps | 100% |
| Norma 202 | <<locked>> | 90% | 55,187 psi | 88% | 2415 fps | 100% |
| Norma 203B | <<locked>> | 94% | 56,289 psi | 90% | 2487 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 49,647 psi | 80% | 2444 fps | 99.3% |
| Ramshot Big Game | <<locked>> | 92% | 53,287 psi | 85% | 2467 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,718 psi | 78% | 2441 fps | 97.9% |
| Ramshot TAC | <<locked>> | 88% | 55,521 psi | 89% | 2441 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 88% | 54,839 psi | 88% | 2454 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 86% | 56,202 psi | 90% | 2421 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,375 psi | 57% | 1473 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 54,795 psi | 88% | 2402 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 55,259 psi | 89% | 2448 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 53,983 psi | 87% | 2513 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 53,171 psi | 85% | 2539 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 49,705 psi | 80% | 2474 fps | 99.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,401 psi | 81% | 2500 fps | 99% |
| Rottweil R 901 | <<locked>> | 88% | 55,303 psi | 89% | 2388 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 54,708 psi | 88% | 2405 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 52,765 psi | 85% | 2434 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 53,737 psi | 86% | 2418 fps | 97.3% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 54,781 psi | 88% | 2441 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 90% | 55,259 psi | 89% | 2438 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 55,724 psi | 89% | 2438 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,069 psi | 83% | 2425 fps | 97.8% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 54,549 psi | 87% | 2379 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 54,868 psi | 88% | 2493 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 54,578 psi | 88% | 2349 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 53,476 psi | 86% | 2418 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 54,346 psi | 87% | 2438 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 53,229 psi | 85% | 2316 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 56,304 psi | 90% | 2352 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,288 psi | 89% | 2398 fps | 97.9% |
| Somchem S321 | <<locked>> | 84% | 52,620 psi | 84% | 2405 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 55,651 psi | 89% | 2356 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 53,214 psi | 85% | 2411 fps | 99.9% |
| Somchem S355 | <<locked>> | 96% | 53,388 psi | 86% | 2434 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,121 psi | 71% | 2402 fps | 100% |
| Vihtavuori N130 | <<locked>> | 86% | 56,347 psi | 90% | 2323 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 53,403 psi | 86% | 2303 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 54,462 psi | 87% | 2375 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 55,695 psi | 89% | 2395 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,201 psi | 89% | 2418 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,301 psi | 84% | 2441 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 88% | 55,738 psi | 89% | 2418 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 53,664 psi | 86% | 2395 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,256 psi | 82% | 2448 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,883 psi | 59% | 2290 fps | 97.7% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,142 psi | 85% | 2431 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 55,201 psi | 89% | 2461 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 53,737 psi | 86% | 2503 fps | 98% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 30,618 psi | 49% | 2208 fps | 96.9% |
| Winchester StaBALL Match | <<locked>> | 90% | 53,983 psi | 87% | 2444 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 44,382 psi | 71% | 2211 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,327 psi | 77% | 2310 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,463 psi | 58% | 2142 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,497 psi | 70% | 2274 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 44,947 psi | 72% | 2251 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 34,505 psi | 55% | 2136 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 32,634 psi | 52% | 2159 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 53,026 psi | 85% | 2277 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,828 psi | 65% | 2238 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 80% | 34,679 psi | 56% | 2110 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,960 psi | 69% | 2247 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 42,598 psi | 68% | 2234 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,111 psi | 80% | 2418 fps | 100% |
| Alliant Power Pro 2000-MR | 48.9 gr | 80% | 36,854 psi | 59% | 2257 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,881 psi | 54% | 2126 fps | 98.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,227 psi | 81% | 2290 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,608 psi | 59% | 2182 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 31,865 psi | 51% | 2129 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,124 psi | 47% | 2093 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 28,703 psi | 46% | 2087 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 35,404 psi | 57% | 2297 fps | 95.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,764 psi | 83% | 2277 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,624 psi | 64% | 2238 fps | 97.8% |
| Bofors RP3 | <<locked>> | 80% | 33,185 psi | 53% | 2129 fps | 98.1% |
| Bofors RP7 | <<locked>> | 92% | 44,744 psi | 72% | 2283 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,904 psi | 72% | 2241 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,191 psi | 66% | 2264 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 45,397 psi | 73% | 2385 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 80% | 49,052 psi | 79% | 2326 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,806 psi | 80% | 2349 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 34,301 psi | 55% | 2133 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 92% | 41,002 psi | 66% | 2306 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 94% | 48,327 psi | 77% | 2375 fps | 95.5% |
| Hodgdon H4895 | <<locked>> | 80% | 41,147 psi | 66% | 2247 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 27,238 psi | 44% | 1998 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,927 psi | 59% | 2221 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 94% | 44,005 psi | 71% | 2372 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,063 psi | 42% | 1283 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,523 psi | 63% | 2205 fps | 99% |
| IMR 3031 | <<locked>> | 80% | 40,393 psi | 65% | 2241 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,332 psi | 58% | 2136 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 82% | 41,597 psi | 67% | 2205 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 50,691 psi | 81% | 2254 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 44,469 psi | 71% | 2303 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 90% | 43,918 psi | 70% | 2270 fps | 95.6% |
| IMR 4831 | <<locked>> | 88% | 31,952 psi | 51% | 2126 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 37,463 psi | 60% | 2208 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 42,960 psi | 69% | 2247 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 47,979 psi | 77% | 2316 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 39,349 psi | 63% | 2218 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 41,234 psi | 66% | 2185 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 36,027 psi | 58% | 2139 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 37,695 psi | 60% | 2175 fps | 95.6% |
| Lovex S070 | <<locked>> | 92% | 40,567 psi | 65% | 2247 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 39,885 psi | 64% | 2198 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 40,045 psi | 64% | 2205 fps | 100% |
| Norma 203B | <<locked>> | 80% | 35,984 psi | 58% | 2172 fps | 97.9% |
| Norma URP | <<locked>> | 88% | 33,605 psi | 54% | 2165 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 35,404 psi | 57% | 2182 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 92% | 37,681 psi | 60% | 2251 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 42,554 psi | 68% | 2247 fps | 97.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,916 psi | 67% | 2267 fps | 99% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,398 psi | 74% | 2290 fps | 99.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,324 psi | 42% | 1316 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,240 psi | 77% | 2316 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 39,813 psi | 64% | 2211 fps | 95.3% |
| ReloadSwiss RS 52 | 47.4 gr | 80% | 38,058 psi | 61% | 2267 fps | 98% |
| ReloadSwiss RS 60 | 48.1 gr | 80% | 31,067 psi | 50% | 2152 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 32,909 psi | 53% | 2178 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 35,940 psi | 58% | 2238 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 43,613 psi | 70% | 2231 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 37,826 psi | 61% | 2156 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 31,198 psi | 50% | 2080 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 92% | 44,744 psi | 72% | 2283 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 37,695 psi | 60% | 2175 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,349 psi | 63% | 2218 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 36,027 psi | 58% | 2139 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 40,567 psi | 65% | 2247 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 50,981 psi | 82% | 2333 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,430 psi | 52% | 2126 fps | 96.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,213 psi | 82% | 2310 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,625 psi | 65% | 2224 fps | 97.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,363 psi | 63% | 2215 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,611 psi | 67% | 2162 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,301 psi | 55% | 2051 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 42,511 psi | 68% | 2221 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 45,890 psi | 74% | 2313 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 41,031 psi | 66% | 2162 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,335 psi | 65% | 2224 fps | 98.7% |
| Somchem S355 | <<locked>> | 80% | 32,285 psi | 52% | 2087 fps | 97.3% |
| Somchem S365 | <<locked>> | 82% | 24,729 psi | 40% | 1982 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 47,166 psi | 76% | 2211 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,901 psi | 67% | 2156 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,217 psi | 60% | 2142 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,985 psi | 61% | 2152 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 30,647 psi | 49% | 2037 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 33,069 psi | 53% | 2123 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 42,888 psi | 69% | 2244 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 36,448 psi | 58% | 2146 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 34,418 psi | 55% | 2169 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 94% | 30,298 psi | 49% | 2149 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 29,167 psi | 47% | 2018 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 42,076 psi | 67% | 2280 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 41,234 psi | 66% | 2310 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 98% | 28,703 psi | 46% | 2149 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,609 psi | 62% | 2218 fps | 98.9% |
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 106 powders for 8.5 x 55 Blaser loaded with the .338 | 250gr | Barnes MRX BT. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,569 fps; across all powders the maximum-charge window runs from 1,437 fps to 2,569 fps. Accurate 4350 gives the best case fill at 100 %, and 106 of the 106 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 49–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:14.0 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, 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. ReloadSwiss RS 60, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for 8.5 x 55 Blaser with the .338 | 250gr | Barnes MRX BT 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.