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:1:14.0
Load data in caliber 8.5 x 55 Blaser with .338 | 250gr | Sierra GameKing bullet and 107 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Power Pro 2000-MR, Alliant Reloder-17 and ReloadSwiss RS 60.
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% | 55,564 psi | 89% | 2349 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 53,737 psi | 86% | 2375 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 53,664 psi | 86% | 2375 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 53,911 psi | 86% | 2421 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 53,911 psi | 86% | 2421 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 54,186 psi | 87% | 2379 fps | 97.1% |
| Accurate 4064 | <<locked>> | 92% | 53,432 psi | 86% | 2415 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,489 psi | 84% | 2484 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 54,360 psi | 87% | 2444 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 55,288 psi | 89% | 2441 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,737 psi | 86% | 2402 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 53,998 psi | 87% | 2372 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,332 psi | 89% | 2490 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 53,693 psi | 86% | 2546 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,940 psi | 88% | 2461 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,143 psi | 88% | 2349 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,869 psi | 90% | 2484 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,024 psi | 82% | 2490 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,347 psi | 89% | 2569 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,158 psi | 58% | 2264 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,001 psi | 64% | 2392 fps | 97.4% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 53,925 psi | 86% | 2457 fps | 99.8% |
| Bofors RP3 | <<locked>> | 94% | 55,506 psi | 89% | 2474 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 55,898 psi | 90% | 2448 fps | 97.7% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,535 psi | 89% | 2385 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 56,246 psi | 90% | 2474 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,404 psi | 87% | 2513 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 84% | 53,737 psi | 86% | 2385 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 53,156 psi | 85% | 2441 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 96% | 53,795 psi | 86% | 2507 fps | 98.1% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 54,534 psi | 87% | 2467 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 88% | 54,926 psi | 88% | 2451 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,108 psi | 76% | 2382 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 53,853 psi | 86% | 2480 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,055 psi | 85% | 2516 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,273 psi | 57% | 1447 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 54,969 psi | 88% | 2438 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 53,229 psi | 85% | 2415 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 54,056 psi | 87% | 2415 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 94% | 53,722 psi | 86% | 2392 fps | 97.9% |
| IMR 4198 | <<locked>> | 82% | 55,361 psi | 89% | 2310 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,446 psi | 84% | 2425 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,418 psi | 87% | 2431 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,208 psi | 71% | 2352 fps | 98.7% |
| IMR 4895 | <<locked>> | 90% | 53,708 psi | 86% | 2464 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 53,737 psi | 86% | 2402 fps | 100% |
| Lovex D073.4 | <<locked>> | 82% | 56,159 psi | 90% | 2408 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 53,621 psi | 86% | 2388 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 53,911 psi | 86% | 2421 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,244 psi | 87% | 2379 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 54,549 psi | 87% | 2425 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 53,505 psi | 86% | 2425 fps | 98.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,273 psi | 87% | 2457 fps | 98.2% |
| Norma 201 | <<locked>> | 88% | 53,214 psi | 85% | 2395 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,737 psi | 86% | 2395 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,027 psi | 88% | 2470 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 52,852 psi | 85% | 2467 fps | 95.9% |
| Norma URPᴾ | <<locked>> | 100% | 51,895 psi | 83% | 2477 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 92% | 55,172 psi | 88% | 2493 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,691 psi | 81% | 2470 fps | 98.3% |
| Ramshot TAC | <<locked>> | 86% | 53,838 psi | 86% | 2421 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,243 psi | 85% | 2434 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,578 psi | 88% | 2405 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,766 psi | 57% | 1483 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,229 psi | 85% | 2382 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 53,606 psi | 86% | 2428 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 56,086 psi | 90% | 2539 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,288 psi | 89% | 2569 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 51,982 psi | 83% | 2507 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,301 psi | 84% | 2530 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 86% | 54,520 psi | 87% | 2379 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 53,650 psi | 86% | 2392 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,376 psi | 89% | 2467 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 55,898 psi | 90% | 2448 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 98% | 53,505 psi | 86% | 2425 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 88% | 53,911 psi | 86% | 2421 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,549 psi | 87% | 2425 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,273 psi | 87% | 2457 fps | 98.2% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,144 psi | 90% | 2398 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 53,461 psi | 86% | 2477 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,086 psi | 90% | 2369 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,825 psi | 90% | 2448 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 56,202 psi | 90% | 2464 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,955 psi | 88% | 2339 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,723 psi | 88% | 2336 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,027 psi | 87% | 2385 fps | 97.9% |
| Somchem S321 | <<locked>> | 84% | 54,636 psi | 88% | 2431 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,201 psi | 87% | 2339 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,129 psi | 88% | 2438 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 55,840 psi | 90% | 2464 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,296 psi | 74% | 2434 fps | 100% |
| Unknown powder | <<locked>> | 98% | 52,982 psi | 85% | 2480 fps | 99.3% |
| Vihtavuori N130 | <<locked>> | 84% | 54,824 psi | 88% | 2306 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,085 psi | 88% | 2323 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,405 psi | 90% | 2398 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,070 psi | 87% | 2375 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 53,795 psi | 86% | 2405 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,447 psi | 87% | 2470 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 86% | 54,056 psi | 87% | 2398 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,550 psi | 89% | 2418 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,476 psi | 86% | 2480 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,102 psi | 63% | 2329 fps | 98.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 54,940 psi | 88% | 2457 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,244 psi | 87% | 2451 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 53,795 psi | 86% | 2507 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,329 psi | 52% | 2254 fps | 97.9% |
| Winchester StaBALL Match | <<locked>> | 82% | 53,882 psi | 86% | 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% | 46,108 psi | 74% | 2234 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,415 psi | 81% | 2333 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,914 psi | 62% | 2175 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,961 psi | 70% | 2290 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,961 psi | 70% | 2290 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 44,773 psi | 72% | 2244 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 36,811 psi | 59% | 2172 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 32,619 psi | 52% | 2156 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 42,569 psi | 68% | 2267 fps | 99.2% |
| ADI AR 2208 | <<locked>> | 80% | 36,187 psi | 58% | 2139 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,585 psi | 71% | 2274 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 44,614 psi | 72% | 2260 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,069 psi | 83% | 2444 fps | 100% |
| Alliant Power Pro 2000-MR | 49.6 gr | 80% | 38,334 psi | 61% | 2290 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,607 psi | 57% | 2159 fps | 98.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,880 psi | 83% | 2310 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,319 psi | 61% | 2211 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,460 psi | 54% | 2169 fps | 95.9% |
| Alliant Reloder-17 | 48.8 gr | 80% | 30,589 psi | 49% | 2126 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,601 psi | 46% | 2083 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 96% | 34,911 psi | 56% | 2283 fps | 95.5% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,437 psi | 66% | 2270 fps | 98.2% |
| Bofors RP3 | <<locked>> | 80% | 35,099 psi | 56% | 2162 fps | 98.6% |
| Bofors RP7 | <<locked>> | 90% | 43,671 psi | 70% | 2267 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,499 psi | 75% | 2264 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,975 psi | 69% | 2290 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,413 psi | 76% | 2415 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 80% | 47,239 psi | 76% | 2300 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,027 psi | 58% | 2165 fps | 96.2% |
| Hodgdon H414 | <<locked>> | 88% | 41,205 psi | 66% | 2310 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 96% | 48,457 psi | 78% | 2379 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 42,917 psi | 69% | 2277 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,021 psi | 43% | 1988 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,492 psi | 59% | 2211 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 94% | 46,064 psi | 74% | 2411 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,295 psi | 42% | 1289 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,276 psi | 61% | 2185 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 38,769 psi | 62% | 2211 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,534 psi | 57% | 2119 fps | 97.4% |
| IMR 4166 Enduron | <<locked>> | 86% | 42,395 psi | 68% | 2218 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 52,373 psi | 84% | 2277 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 43,540 psi | 70% | 2290 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 42,772 psi | 69% | 2254 fps | 95.4% |
| IMR 4831 | <<locked>> | 90% | 32,547 psi | 52% | 2136 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 39,247 psi | 63% | 2238 fps | 98.7% |
| IMR 8208 XBR | <<locked>> | 80% | 44,585 psi | 71% | 2274 fps | 99.9% |
| Lovex D073.4 | <<locked>> | 80% | 52,359 psi | 84% | 2362 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 50,285 psi | 81% | 2343 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,321 psi | 66% | 2247 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 42,786 psi | 69% | 2211 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 37,826 psi | 61% | 2172 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 37,333 psi | 60% | 2165 fps | 95.6% |
| Lovex S070 | <<locked>> | 90% | 39,813 psi | 64% | 2231 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 41,785 psi | 67% | 2228 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 41,829 psi | 67% | 2231 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,710 psi | 60% | 2205 fps | 98.4% |
| Norma 204 | <<locked>> | 98% | 49,487 psi | 79% | 2418 fps | 95.1% |
| Norma URP | <<locked>> | 86% | 33,156 psi | 53% | 2156 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 36,985 psi | 59% | 2215 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 92% | 39,305 psi | 63% | 2283 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 44,280 psi | 71% | 2277 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,787 psi | 70% | 2297 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,950 psi | 77% | 2313 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,614 psi | 43% | 1322 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,937 psi | 80% | 2339 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,044 psi | 63% | 2198 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,871 psi | 64% | 2297 fps | 98.4% |
| ReloadSwiss RS 60 | 48.8 gr | 80% | 32,547 psi | 52% | 2185 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,518 psi | 52% | 2169 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 35,215 psi | 56% | 2221 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 45,542 psi | 73% | 2257 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,682 psi | 64% | 2185 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 33,069 psi | 53% | 2116 fps | 97.9% |
| Rottweil R 907 | <<locked>> | 90% | 43,671 psi | 70% | 2267 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 86% | 37,333 psi | 60% | 2165 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,321 psi | 66% | 2247 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 37,826 psi | 61% | 2172 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 39,813 psi | 64% | 2231 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,620 psi | 84% | 2356 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,982 psi | 54% | 2159 fps | 97.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,736 psi | 85% | 2329 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,627 psi | 68% | 2257 fps | 97.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,944 psi | 66% | 2241 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,033 psi | 69% | 2182 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,694 psi | 57% | 2070 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 41,539 psi | 67% | 2205 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 47,848 psi | 77% | 2339 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 42,772 psi | 69% | 2188 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,177 psi | 68% | 2254 fps | 99.1% |
| Somchem S355 | <<locked>> | 80% | 34,084 psi | 55% | 2123 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 24,569 psi | 39% | 1972 fps | 95.2% |
| Unknown powder | <<locked>> | 84% | 33,968 psi | 54% | 2159 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 48,675 psi | 78% | 2231 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,323 psi | 69% | 2175 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,899 psi | 62% | 2169 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,697 psi | 64% | 2178 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,314 psi | 52% | 2067 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 32,576 psi | 52% | 2113 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 44,570 psi | 71% | 2270 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 38,087 psi | 61% | 2172 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 34,142 psi | 55% | 2162 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 92% | 30,298 psi | 49% | 2146 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,645 psi | 46% | 2001 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 47,311 psi | 76% | 2359 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 41,205 psi | 66% | 2310 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,514 psi | 46% | 2146 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,212 psi | 81% | 2398 fps | 100% |
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 123 powders for 8.5 x 55 Blaser loaded with the .338 | 250gr | Sierra GameKing. Alliant Reloder-17 delivers the highest muzzle velocity at 2,569 fps; across all powders the maximum-charge window runs from 1,447 fps to 2,569 fps. Accurate 3100 gives the best case fill at 100 %, and 123 of the 123 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 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. Alliant Power Pro 2000-MR, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for 8.5 x 55 Blaser with the .338 | 250gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, Alliant Reloder-19, Alliant Reloder-22 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.