Load Specifications
Bullet Manufacturer:Sierra
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:1:12.5
Load data in caliber 8.5 x 55 Blaser with .338 | 250gr | Sierra MatchKing 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% | 53,403 psi | 86% | 2310 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,071 psi | 88% | 2375 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 54,404 psi | 87% | 2369 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 53,214 psi | 85% | 2388 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 54,418 psi | 87% | 2365 fps | 96.8% |
| Accurate 4064 | <<locked>> | 94% | 54,186 psi | 87% | 2408 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 49,705 psi | 80% | 2431 fps | 99.2% |
| Accurate LT-30 | <<locked>> | 82% | 56,043 psi | 90% | 2297 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 55,579 psi | 89% | 2438 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 53,156 psi | 85% | 2395 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 88% | 54,853 psi | 88% | 2398 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 55,129 psi | 88% | 2372 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 52,968 psi | 85% | 2441 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 54,752 psi | 88% | 2539 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 56,072 psi | 90% | 2454 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 56,434 psi | 90% | 2346 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 53,330 psi | 86% | 2431 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 48,733 psi | 78% | 2434 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 98% | 52,736 psi | 85% | 2513 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,418 psi | 55% | 2205 fps | 97.5% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 37,768 psi | 61% | 2326 fps | 96.1% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,955 psi | 88% | 2297 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 55,201 psi | 89% | 2454 fps | 99.7% |
| Bofors RP3 | <<locked>> | 96% | 56,420 psi | 90% | 2467 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 53,461 psi | 86% | 2395 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 86% | 53,461 psi | 86% | 2339 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 53,722 psi | 86% | 2425 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 55,608 psi | 89% | 2510 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 84% | 55,579 psi | 89% | 2388 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 53,040 psi | 85% | 2375 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 54,302 psi | 87% | 2438 fps | 99.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 52,910 psi | 85% | 2474 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 98% | 54,201 psi | 87% | 2441 fps | 96.4% |
| Hodgdon H4895 | <<locked>> | 90% | 56,115 psi | 90% | 2448 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,759 psi | 72% | 2329 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 54,940 psi | 88% | 2477 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 54,085 psi | 87% | 2507 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,215 psi | 56% | 1427 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 53,925 psi | 86% | 2405 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 55,637 psi | 89% | 2428 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,999 psi | 90% | 2421 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 53,156 psi | 85% | 2362 fps | 97.4% |
| IMR 4198 | <<locked>> | 82% | 53,461 psi | 86% | 2270 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 50,198 psi | 80% | 2372 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 98% | 55,608 psi | 89% | 2425 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,181 psi | 76% | 2379 fps | 98.9% |
| IMR 4895 | <<locked>> | 92% | 54,650 psi | 88% | 2457 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 54,853 psi | 88% | 2398 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 55,085 psi | 88% | 2385 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 54,795 psi | 88% | 2418 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 55,463 psi | 89% | 2375 fps | 100% |
| Lovex S062 | <<locked>> | 94% | 55,521 psi | 89% | 2418 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 54,259 psi | 87% | 2415 fps | 98.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 51,851 psi | 83% | 2402 fps | 97.5% |
| Norma 201 | <<locked>> | 90% | 54,360 psi | 87% | 2392 fps | 100% |
| Norma 202 | <<locked>> | 90% | 54,795 psi | 88% | 2392 fps | 100% |
| Norma 203B | <<locked>> | 94% | 55,796 psi | 89% | 2464 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 49,298 psi | 79% | 2421 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 94% | 56,202 psi | 90% | 2487 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,370 psi | 78% | 2418 fps | 97.6% |
| Ramshot TAC | <<locked>> | 88% | 55,100 psi | 88% | 2415 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 88% | 54,317 psi | 87% | 2431 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 86% | 55,941 psi | 90% | 2402 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,447 psi | 57% | 1460 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 54,578 psi | 88% | 2382 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 54,665 psi | 88% | 2421 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 53,272 psi | 85% | 2484 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 56,289 psi | 90% | 2559 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 49,037 psi | 79% | 2448 fps | 99% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 49,864 psi | 80% | 2470 fps | 98.7% |
| Rottweil R 901 | <<locked>> | 88% | 55,405 psi | 89% | 2372 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 54,810 psi | 88% | 2388 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 56,275 psi | 90% | 2461 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 53,461 psi | 86% | 2395 fps | 97% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 54,259 psi | 87% | 2415 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 90% | 54,795 psi | 88% | 2418 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 55,521 psi | 89% | 2418 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 51,851 psi | 83% | 2402 fps | 97.5% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 54,085 psi | 87% | 2356 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 54,404 psi | 87% | 2470 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 54,244 psi | 87% | 2329 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 53,142 psi | 85% | 2392 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 53,809 psi | 86% | 2415 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 56,434 psi | 90% | 2336 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 55,883 psi | 90% | 2333 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,100 psi | 88% | 2379 fps | 97.7% |
| Somchem S321 | <<locked>> | 86% | 55,956 psi | 90% | 2428 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 55,347 psi | 89% | 2336 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 56,391 psi | 90% | 2434 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 53,287 psi | 85% | 2415 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,005 psi | 71% | 2382 fps | 100% |
| Vihtavuori N130 | <<locked>> | 86% | 56,304 psi | 90% | 2303 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 53,069 psi | 85% | 2283 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 53,998 psi | 87% | 2356 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 55,042 psi | 88% | 2372 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,839 psi | 88% | 2398 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 51,924 psi | 83% | 2421 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 88% | 55,274 psi | 89% | 2395 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 53,200 psi | 85% | 2372 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 50,879 psi | 82% | 2425 fps | 99.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,883 psi | 59% | 2274 fps | 97.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 52,620 psi | 84% | 2408 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 54,824 psi | 88% | 2441 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 53,229 psi | 85% | 2477 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 30,763 psi | 49% | 2185 fps | 96.5% |
| Winchester StaBALL Match | <<locked>> | 90% | 53,490 psi | 86% | 2421 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% | 44,425 psi | 71% | 2195 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,399 psi | 78% | 2290 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,028 psi | 59% | 2133 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,265 psi | 69% | 2254 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 47,935 psi | 77% | 2277 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 35,027 psi | 56% | 2126 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 32,909 psi | 53% | 2149 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 52,707 psi | 85% | 2257 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,683 psi | 65% | 2218 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 80% | 34,693 psi | 56% | 2093 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,714 psi | 68% | 2224 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 80% | 42,424 psi | 68% | 2218 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 49,734 psi | 80% | 2395 fps | 99.9% |
| Alliant Power Pro 2000-MR | 47.4 gr | 80% | 36,680 psi | 59% | 2234 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,982 psi | 54% | 2113 fps | 98% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,038 psi | 80% | 2270 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,550 psi | 59% | 2162 fps | 97.3% |
| Alliant Reloder-16 | <<locked>> | 88% | 33,968 psi | 54% | 2159 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,298 psi | 47% | 2077 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 28,950 psi | 46% | 2073 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 35,302 psi | 57% | 2270 fps | 95.1% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,590 psi | 83% | 2257 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,610 psi | 64% | 2221 fps | 97.5% |
| Bofors RP3 | <<locked>> | 80% | 33,359 psi | 53% | 2113 fps | 98% |
| Bofors RP7 | <<locked>> | 92% | 44,643 psi | 72% | 2264 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,628 psi | 72% | 2218 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,002 psi | 66% | 2244 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,962 psi | 72% | 2362 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 80% | 48,921 psi | 78% | 2306 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,647 psi | 80% | 2329 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 34,374 psi | 55% | 2113 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 94% | 43,598 psi | 70% | 2333 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 94% | 47,921 psi | 77% | 2352 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 41,031 psi | 66% | 2228 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 29,153 psi | 47% | 2028 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,840 psi | 59% | 2201 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 96% | 46,876 psi | 75% | 2402 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,107 psi | 42% | 1270 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,537 psi | 63% | 2188 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 40,263 psi | 65% | 2224 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,390 psi | 58% | 2119 fps | 97.3% |
| IMR 4166 Enduron | <<locked>> | 84% | 44,092 psi | 71% | 2228 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 50,430 psi | 81% | 2234 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 46,963 psi | 75% | 2326 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 90% | 43,714 psi | 70% | 2251 fps | 95.3% |
| IMR 4831 | <<locked>> | 88% | 32,169 psi | 52% | 2113 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 37,420 psi | 60% | 2188 fps | 98.1% |
| IMR 8208 XBR | <<locked>> | 80% | 42,714 psi | 68% | 2224 fps | 99.6% |
| Lovex D073.5 | <<locked>> | 80% | 48,124 psi | 77% | 2300 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 39,407 psi | 63% | 2205 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 41,220 psi | 66% | 2165 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 36,187 psi | 58% | 2126 fps | 98.8% |
| Lovex S065 | <<locked>> | 88% | 37,869 psi | 61% | 2159 fps | 95.4% |
| Lovex S070 | <<locked>> | 94% | 42,931 psi | 69% | 2267 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 40,118 psi | 64% | 2182 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 40,132 psi | 64% | 2188 fps | 100% |
| Norma 203B | <<locked>> | 80% | 35,940 psi | 58% | 2152 fps | 97.7% |
| Norma URP | <<locked>> | 88% | 33,591 psi | 54% | 2149 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 35,244 psi | 57% | 2162 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 94% | 39,914 psi | 64% | 2274 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 42,554 psi | 68% | 2231 fps | 96.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,901 psi | 67% | 2247 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,122 psi | 74% | 2267 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,411 psi | 42% | 1302 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,950 psi | 77% | 2297 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 39,682 psi | 64% | 2192 fps | 95% |
| ReloadSwiss RS 52 | 46 gr | 80% | 37,956 psi | 61% | 2247 fps | 97.7% |
| ReloadSwiss RS 60 | 46.7 gr | 80% | 31,183 psi | 50% | 2133 fps | 98.8% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 35,128 psi | 56% | 2208 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 38,159 psi | 61% | 2264 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 43,888 psi | 70% | 2215 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,000 psi | 61% | 2139 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 80% | 31,343 psi | 50% | 2064 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 92% | 44,643 psi | 72% | 2264 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 88% | 37,869 psi | 61% | 2159 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,407 psi | 63% | 2205 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 36,187 psi | 58% | 2126 fps | 98.8% |
| Shooters World SW4350 | <<locked>> | 94% | 42,931 psi | 69% | 2267 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 50,531 psi | 81% | 2310 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,489 psi | 52% | 2106 fps | 96.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,865 psi | 82% | 2290 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,756 psi | 65% | 2208 fps | 97% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,276 psi | 63% | 2195 fps | 98.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,539 psi | 67% | 2142 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,330 psi | 55% | 2034 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 42,250 psi | 68% | 2198 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 45,847 psi | 74% | 2293 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 41,147 psi | 66% | 2149 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,335 psi | 65% | 2205 fps | 98.5% |
| Somchem S355 | <<locked>> | 80% | 32,518 psi | 52% | 2073 fps | 97.2% |
| Somchem S365 | <<locked>> | 82% | 24,990 psi | 40% | 1972 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 47,050 psi | 75% | 2195 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,727 psi | 67% | 2139 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,202 psi | 60% | 2126 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,840 psi | 61% | 2133 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 30,690 psi | 49% | 2021 fps | 97.9% |
| Vihtavuori N160 | <<locked>> | 86% | 33,199 psi | 53% | 2106 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 42,714 psi | 68% | 2221 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 36,477 psi | 58% | 2129 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 34,432 psi | 55% | 2152 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 94% | 30,516 psi | 49% | 2136 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 29,312 psi | 47% | 2001 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 41,916 psi | 67% | 2260 fps | 99.9% |
| Winchester 760 | <<locked>> | 94% | 43,598 psi | 70% | 2333 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 98% | 28,863 psi | 46% | 2129 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,363 psi | 62% | 2195 fps | 98.7% |
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 117 powders for 8.5 x 55 Blaser loaded with the .338 | 250gr | Sierra MatchKing. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,559 fps; across all powders the maximum-charge window runs from 1,427 fps to 2,559 fps. Accurate 3100 gives the best case fill at 100 %, and 117 of the 117 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 47–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 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 | Sierra MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 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.