Load Specifications
Bullet Manufacturer:Lapua
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:1:13.5
Load data in caliber 8.5 x 55 Blaser with .338 | 250gr | Lapua Lock Base bullet and 105 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, ReloadSwiss RS 60 and Alliant Reloder-17.
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% | 55,390 psi | 89% | 2346 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 53,592 psi | 86% | 2372 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 53,287 psi | 85% | 2369 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,259 psi | 89% | 2428 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 52,968 psi | 85% | 2369 fps | 96.9% |
| Accurate 4064 | <<locked>> | 92% | 53,026 psi | 85% | 2408 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,098 psi | 84% | 2477 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 54,259 psi | 87% | 2438 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 55,201 psi | 89% | 2438 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,301 psi | 85% | 2395 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 53,867 psi | 86% | 2372 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,201 psi | 89% | 2487 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 53,330 psi | 86% | 2539 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,810 psi | 88% | 2457 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 54,926 psi | 88% | 2346 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,492 psi | 89% | 2477 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,691 psi | 81% | 2480 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,303 psi | 89% | 2566 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,114 psi | 58% | 2260 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 39,769 psi | 64% | 2385 fps | 97.3% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 53,882 psi | 86% | 2454 fps | 99.7% |
| Bofors RP3 | <<locked>> | 94% | 55,390 psi | 89% | 2470 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 55,579 psi | 89% | 2441 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,390 psi | 89% | 2382 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 55,825 psi | 90% | 2467 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,273 psi | 87% | 2510 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 54,186 psi | 87% | 2388 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,056 psi | 88% | 2411 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 56,362 psi | 90% | 2480 fps | 99.6% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 55,245 psi | 89% | 2523 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 96% | 53,069 psi | 85% | 2444 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 88% | 54,752 psi | 88% | 2448 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,804 psi | 75% | 2375 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 53,751 psi | 86% | 2477 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 52,779 psi | 85% | 2510 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,230 psi | 56% | 1444 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 56,043 psi | 90% | 2448 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 54,592 psi | 88% | 2428 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,534 psi | 87% | 2421 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,100 psi | 88% | 2408 fps | 98% |
| IMR 4198 | <<locked>> | 82% | 55,172 psi | 88% | 2306 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,083 psi | 84% | 2418 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,404 psi | 87% | 2428 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,617 psi | 80% | 2431 fps | 99.4% |
| IMR 4895 | <<locked>> | 90% | 53,345 psi | 86% | 2457 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 53,301 psi | 85% | 2395 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 53,505 psi | 86% | 2382 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 53,490 psi | 86% | 2415 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,114 psi | 87% | 2375 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 54,433 psi | 87% | 2421 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 53,142 psi | 85% | 2418 fps | 98.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 53,925 psi | 86% | 2448 fps | 98.1% |
| Norma 201 | <<locked>> | 90% | 56,347 psi | 90% | 2431 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,592 psi | 86% | 2395 fps | 100% |
| Norma 203B | <<locked>> | 92% | 54,650 psi | 88% | 2464 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 52,562 psi | 84% | 2457 fps | 95.8% |
| Norma URPᴾ | <<locked>> | 100% | 51,532 psi | 83% | 2470 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 92% | 55,071 psi | 88% | 2490 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,372 psi | 81% | 2464 fps | 98.2% |
| Ramshot TAC | <<locked>> | 86% | 53,505 psi | 86% | 2415 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 86% | 52,895 psi | 85% | 2428 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,215 psi | 87% | 2398 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,723 psi | 57% | 1480 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,318 psi | 90% | 2418 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 53,287 psi | 85% | 2421 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 55,680 psi | 89% | 2533 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 54,897 psi | 88% | 2562 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 51,619 psi | 83% | 2500 fps | 99.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,011 psi | 83% | 2523 fps | 99.2% |
| Rottweil R 901 | <<locked>> | 86% | 54,099 psi | 87% | 2372 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 53,548 psi | 86% | 2388 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 54,940 psi | 88% | 2461 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 55,579 psi | 89% | 2441 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 53,142 psi | 85% | 2418 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 88% | 53,490 psi | 86% | 2415 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,433 psi | 87% | 2421 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 53,925 psi | 86% | 2448 fps | 98.1% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,057 psi | 90% | 2395 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 53,142 psi | 85% | 2470 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 55,927 psi | 90% | 2365 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,434 psi | 89% | 2441 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,811 psi | 89% | 2457 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,795 psi | 88% | 2336 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,650 psi | 88% | 2336 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 53,737 psi | 86% | 2382 fps | 97.8% |
| Somchem S321 | <<locked>> | 84% | 54,534 psi | 87% | 2428 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,114 psi | 87% | 2336 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,027 psi | 88% | 2434 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 55,419 psi | 89% | 2457 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,006 psi | 74% | 2428 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 54,636 psi | 88% | 2303 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,926 psi | 88% | 2323 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,289 psi | 90% | 2395 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 53,954 psi | 87% | 2372 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 53,447 psi | 86% | 2398 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,099 psi | 87% | 2467 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 86% | 53,925 psi | 86% | 2398 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,506 psi | 89% | 2415 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,113 psi | 85% | 2474 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,783 psi | 62% | 2323 fps | 98.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 54,650 psi | 88% | 2451 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 53,505 psi | 86% | 2438 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 55,564 psi | 89% | 2530 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,111 psi | 51% | 2247 fps | 97.8% |
| Winchester StaBALL Match | <<locked>> | 90% | 55,840 psi | 90% | 2467 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% | 45,963 psi | 74% | 2231 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,256 psi | 81% | 2329 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,522 psi | 62% | 2169 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,339 psi | 73% | 2300 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 46,644 psi | 75% | 2277 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 36,463 psi | 58% | 2165 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 32,285 psi | 52% | 2146 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 42,192 psi | 68% | 2257 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 36,071 psi | 58% | 2136 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,208 psi | 71% | 2264 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 44,135 psi | 71% | 2251 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 51,590 psi | 83% | 2438 fps | 100% |
| Alliant Power Pro 2000-MR | 49.4 gr | 80% | 38,247 psi | 61% | 2287 fps | 97.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,433 psi | 57% | 2152 fps | 98.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,721 psi | 83% | 2306 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,014 psi | 61% | 2205 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,185 psi | 53% | 2159 fps | 95.7% |
| Alliant Reloder-17 | 48.6 gr | 80% | 30,487 psi | 49% | 2123 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,369 psi | 45% | 2073 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 96% | 34,722 psi | 56% | 2277 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,307 psi | 66% | 2264 fps | 98.2% |
| Bofors RP3 | <<locked>> | 80% | 34,940 psi | 56% | 2159 fps | 98.6% |
| Bofors RP7 | <<locked>> | 90% | 43,555 psi | 70% | 2264 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,122 psi | 74% | 2254 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,859 psi | 69% | 2290 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,007 psi | 75% | 2408 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 80% | 50,676 psi | 81% | 2343 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,372 psi | 82% | 2369 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 35,911 psi | 58% | 2159 fps | 96.1% |
| Hodgdon H414 | <<locked>> | 92% | 42,699 psi | 68% | 2336 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 92% | 46,876 psi | 75% | 2352 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 42,525 psi | 68% | 2270 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,572 psi | 46% | 2028 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,464 psi | 62% | 2247 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 94% | 45,788 psi | 73% | 2405 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,237 psi | 42% | 1286 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,959 psi | 66% | 2231 fps | 99.2% |
| IMR 3031 | <<locked>> | 80% | 42,134 psi | 68% | 2264 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,811 psi | 61% | 2162 fps | 97.9% |
| IMR 4166 Enduron | <<locked>> | 82% | 42,946 psi | 69% | 2224 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 52,214 psi | 84% | 2270 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 43,439 psi | 70% | 2287 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 42,699 psi | 68% | 2251 fps | 95.4% |
| IMR 4831 | <<locked>> | 86% | 31,546 psi | 51% | 2113 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 38,899 psi | 62% | 2231 fps | 98.7% |
| IMR 8208 XBR | <<locked>> | 80% | 44,208 psi | 71% | 2264 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 49,879 psi | 80% | 2339 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,191 psi | 66% | 2244 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 42,641 psi | 68% | 2208 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 37,652 psi | 60% | 2165 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 37,043 psi | 59% | 2159 fps | 95.4% |
| Lovex S070 | <<locked>> | 90% | 39,726 psi | 64% | 2228 fps | 95% |
| Norma 201 | <<locked>> | 80% | 41,408 psi | 66% | 2218 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 41,713 psi | 67% | 2228 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,376 psi | 60% | 2195 fps | 98.3% |
| Norma 204 | <<locked>> | 98% | 49,153 psi | 79% | 2408 fps | 95% |
| Norma URP | <<locked>> | 86% | 33,069 psi | 53% | 2152 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 36,898 psi | 59% | 2208 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 39,044 psi | 63% | 2277 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 44,164 psi | 71% | 2274 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,439 psi | 70% | 2290 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,863 psi | 77% | 2310 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,542 psi | 43% | 1319 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,792 psi | 80% | 2336 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 38,740 psi | 62% | 2188 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,697 psi | 64% | 2293 fps | 98.4% |
| ReloadSwiss RS 60 | 48.6 gr | 80% | 32,460 psi | 52% | 2182 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 34,447 psi | 55% | 2211 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 37,260 psi | 60% | 2264 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 45,339 psi | 73% | 2254 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,552 psi | 63% | 2182 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 32,764 psi | 53% | 2106 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 43,555 psi | 70% | 2264 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 86% | 37,043 psi | 59% | 2159 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,191 psi | 66% | 2244 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 37,652 psi | 60% | 2165 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 90% | 39,726 psi | 64% | 2228 fps | 95% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,475 psi | 84% | 2352 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,881 psi | 54% | 2152 fps | 97.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,562 psi | 84% | 2326 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,279 psi | 68% | 2251 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,857 psi | 66% | 2238 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,902 psi | 69% | 2178 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,534 psi | 57% | 2067 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 41,466 psi | 66% | 2205 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 47,747 psi | 77% | 2336 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 42,409 psi | 68% | 2182 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,090 psi | 67% | 2251 fps | 99% |
| Somchem S355 | <<locked>> | 80% | 33,750 psi | 54% | 2113 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 24,482 psi | 39% | 1969 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 48,501 psi | 78% | 2228 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,178 psi | 69% | 2172 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,740 psi | 62% | 2165 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,320 psi | 63% | 2172 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,995 psi | 51% | 2060 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 84% | 32,489 psi | 52% | 2106 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 44,469 psi | 71% | 2267 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 38,000 psi | 61% | 2169 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 33,823 psi | 54% | 2156 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 92% | 30,211 psi | 48% | 2142 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,587 psi | 46% | 1998 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 43,656 psi | 70% | 2303 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 40,219 psi | 64% | 2290 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,326 psi | 45% | 2136 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,132 psi | 64% | 2241 fps | 99.2% |
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 105 powders for 8.5 x 55 Blaser loaded with the .338 | 250gr | Lapua Lock Base. Alliant Reloder-17 delivers the highest muzzle velocity at 2,566 fps; across all powders the maximum-charge window runs from 1,444 fps to 2,566 fps. Accurate 4350 gives the best case fill at 100 %, and 105 of the 105 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 51–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:13.5 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. Alliant Power Pro 2000-MR, ReloadSwiss RS 60, Alliant Reloder-17 rank at the top here: for 8.5 x 55 Blaser with the .338 | 250gr | Lapua Lock Base 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.