Load Specifications
Bullet:.338 | 250gr | Hornady SP
Bullet Manufacturer:Hornady
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:1:15.0
Load data in caliber 8.5 x 55 Blaser with .338 | 250gr | Hornady SP bullet and 103 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% | 56,318 psi | 90% | 2362 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,404 psi | 87% | 2388 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,418 psi | 87% | 2385 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,304 psi | 90% | 2444 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 54,099 psi | 87% | 2392 fps | 97.2% |
| Accurate 4064 | <<locked>> | 92% | 54,128 psi | 87% | 2428 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,316 psi | 85% | 2500 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 88% | 55,303 psi | 89% | 2461 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 56,086 psi | 90% | 2457 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,346 psi | 87% | 2415 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,824 psi | 88% | 2385 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,159 psi | 90% | 2503 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,491 psi | 87% | 2562 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,811 psi | 89% | 2477 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,941 psi | 90% | 2362 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 53,026 psi | 85% | 2451 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,750 psi | 83% | 2507 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 98% | 56,391 psi | 90% | 2585 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,912 psi | 59% | 2283 fps | 98.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,727 psi | 65% | 2415 fps | 97.7% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,723 psi | 88% | 2474 fps | 99.8% |
| Bofors RP3 | <<locked>> | 94% | 56,405 psi | 90% | 2490 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 53,142 psi | 85% | 2418 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,130 psi | 90% | 2395 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,330 psi | 86% | 2444 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,376 psi | 89% | 2530 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 55,071 psi | 88% | 2405 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,811 psi | 89% | 2428 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 53,925 psi | 86% | 2457 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 98% | 53,055 psi | 85% | 2503 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 96% | 54,114 psi | 87% | 2467 fps | 96.9% |
| Hodgdon H4895 | <<locked>> | 88% | 55,811 psi | 89% | 2467 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,848 psi | 77% | 2398 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,737 psi | 88% | 2497 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,853 psi | 86% | 2536 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,375 psi | 57% | 1453 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,577 psi | 86% | 2425 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,535 psi | 89% | 2444 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,506 psi | 89% | 2441 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,941 psi | 90% | 2428 fps | 98.3% |
| IMR 4198 | <<locked>> | 82% | 55,956 psi | 90% | 2323 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,069 psi | 85% | 2441 fps | 97.4% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,143 psi | 88% | 2448 fps | 98.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,734 psi | 81% | 2451 fps | 99.6% |
| IMR 4895 | <<locked>> | 90% | 54,360 psi | 87% | 2477 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 54,346 psi | 87% | 2415 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,244 psi | 87% | 2398 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,534 psi | 87% | 2434 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,100 psi | 88% | 2395 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 55,114 psi | 88% | 2434 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 54,244 psi | 87% | 2441 fps | 99.1% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,998 psi | 88% | 2470 fps | 98.4% |
| Norma 201 | <<locked>> | 88% | 53,853 psi | 86% | 2408 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,346 psi | 87% | 2408 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,622 psi | 89% | 2484 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 53,722 psi | 86% | 2484 fps | 96.2% |
| Norma URPᴾ | <<locked>> | 100% | 52,678 psi | 84% | 2493 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 92% | 56,260 psi | 90% | 2510 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,605 psi | 83% | 2490 fps | 98.5% |
| Ramshot TAC | <<locked>> | 86% | 54,621 psi | 88% | 2438 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,070 psi | 87% | 2451 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,114 psi | 88% | 2418 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,868 psi | 58% | 1490 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,896 psi | 86% | 2398 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,346 psi | 87% | 2444 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 53,461 psi | 86% | 2510 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 56,333 psi | 90% | 2585 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,055 psi | 85% | 2526 fps | 99.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,156 psi | 85% | 2549 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 86% | 54,940 psi | 88% | 2388 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,302 psi | 87% | 2405 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 56,260 psi | 90% | 2484 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 53,142 psi | 85% | 2418 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,244 psi | 87% | 2441 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,534 psi | 87% | 2434 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,114 psi | 88% | 2434 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,998 psi | 88% | 2470 fps | 98.4% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,244 psi | 87% | 2493 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,318 psi | 90% | 2461 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,621 psi | 86% | 2434 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,622 psi | 89% | 2352 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,651 psi | 89% | 2352 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,752 psi | 88% | 2402 fps | 98.1% |
| Somchem S321 | <<locked>> | 84% | 55,477 psi | 89% | 2448 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,781 psi | 88% | 2352 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,869 psi | 90% | 2451 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 53,171 psi | 85% | 2438 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,065 psi | 75% | 2448 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,535 psi | 89% | 2320 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,767 psi | 89% | 2336 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,099 psi | 87% | 2375 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,969 psi | 88% | 2392 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,621 psi | 88% | 2418 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,201 psi | 89% | 2487 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 86% | 54,650 psi | 88% | 2411 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 56,362 psi | 90% | 2431 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,143 psi | 87% | 2493 fps | 99.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,813 psi | 64% | 2346 fps | 98.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,767 psi | 89% | 2470 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 54,534 psi | 87% | 2457 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 53,055 psi | 85% | 2503 fps | 98.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,880 psi | 53% | 2277 fps | 98.3% |
| Winchester StaBALL Match | <<locked>> | 88% | 53,243 psi | 85% | 2441 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% | 46,862 psi | 75% | 2247 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,082 psi | 82% | 2346 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,436 psi | 63% | 2185 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,108 psi | 74% | 2316 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 44,556 psi | 71% | 2251 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 37,260 psi | 60% | 2182 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 30,922 psi | 50% | 2119 fps | 95.1% |
| ADI AR 2206H | <<locked>> | 80% | 42,975 psi | 69% | 2280 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 36,738 psi | 59% | 2156 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,991 psi | 72% | 2283 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 45,121 psi | 72% | 2270 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,591 psi | 84% | 2457 fps | 100% |
| Alliant Power Pro 2000-MR | 50.3 gr | 80% | 38,841 psi | 62% | 2306 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,187 psi | 58% | 2175 fps | 98.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,707 psi | 85% | 2323 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,711 psi | 62% | 2224 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 31,850 psi | 51% | 2133 fps | 95.3% |
| Alliant Reloder-17 | 49.6 gr | 80% | 31,169 psi | 50% | 2146 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,935 psi | 46% | 2096 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,389 psi | 57% | 2303 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,959 psi | 67% | 2283 fps | 98.4% |
| Bofors RP3 | <<locked>> | 80% | 35,679 psi | 57% | 2178 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 44,396 psi | 71% | 2287 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,862 psi | 75% | 2274 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,613 psi | 70% | 2306 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,037 psi | 77% | 2428 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 80% | 51,576 psi | 83% | 2362 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,431 psi | 84% | 2388 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,579 psi | 59% | 2178 fps | 96.4% |
| Hodgdon H414 | <<locked>> | 90% | 40,799 psi | 65% | 2310 fps | 95.3% |
| Hodgdon H4350 | <<locked>> | 92% | 47,688 psi | 76% | 2375 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 43,323 psi | 69% | 2287 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,311 psi | 44% | 2001 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,146 psi | 63% | 2264 fps | 99.4% |
| Hodgdon Superformance | <<locked>> | 92% | 43,497 psi | 70% | 2372 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,310 psi | 42% | 1296 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,713 psi | 67% | 2247 fps | 99.4% |
| IMR 3031 | <<locked>> | 80% | 42,844 psi | 69% | 2280 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,566 psi | 62% | 2182 fps | 98.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 40,944 psi | 66% | 2198 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 52,939 psi | 85% | 2287 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 44,164 psi | 71% | 2306 fps | 95.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 40,872 psi | 66% | 2224 fps | 95% |
| IMR 4831 | <<locked>> | 86% | 32,329 psi | 52% | 2136 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 39,653 psi | 64% | 2251 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 44,991 psi | 72% | 2283 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 50,894 psi | 82% | 2356 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,003 psi | 67% | 2264 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,366 psi | 70% | 2228 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 38,435 psi | 62% | 2185 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 35,534 psi | 57% | 2136 fps | 95.1% |
| Lovex S070 | <<locked>> | 90% | 40,538 psi | 65% | 2251 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 42,206 psi | 68% | 2238 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 42,496 psi | 68% | 2247 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,101 psi | 61% | 2215 fps | 98.5% |
| Norma 204 | <<locked>> | 98% | 50,372 psi | 81% | 2438 fps | 95.5% |
| Norma URP | <<locked>> | 84% | 31,734 psi | 51% | 2126 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 37,507 psi | 60% | 2228 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 37,536 psi | 60% | 2254 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 44,802 psi | 72% | 2290 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,367 psi | 71% | 2310 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,559 psi | 78% | 2326 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,614 psi | 43% | 1325 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,589 psi | 81% | 2352 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,537 psi | 63% | 2211 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,567 psi | 65% | 2316 fps | 98.6% |
| ReloadSwiss RS 60 | 49.6 gr | 80% | 33,185 psi | 53% | 2205 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,982 psi | 53% | 2182 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 35,723 psi | 57% | 2241 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 46,224 psi | 74% | 2270 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,118 psi | 64% | 2198 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 33,504 psi | 54% | 2126 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 90% | 44,396 psi | 71% | 2287 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 35,534 psi | 57% | 2136 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,003 psi | 67% | 2264 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,435 psi | 62% | 2185 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 40,538 psi | 65% | 2251 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,490 psi | 55% | 2172 fps | 97.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,149 psi | 69% | 2270 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,524 psi | 67% | 2254 fps | 99.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,714 psi | 70% | 2195 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,274 psi | 58% | 2087 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 42,293 psi | 68% | 2224 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 48,472 psi | 78% | 2352 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,178 psi | 69% | 2198 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,714 psi | 68% | 2267 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 34,476 psi | 55% | 2133 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 25,005 psi | 40% | 1991 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 49,414 psi | 79% | 2244 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,005 psi | 71% | 2188 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,639 psi | 64% | 2182 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,103 psi | 64% | 2188 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,677 psi | 52% | 2080 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 33,069 psi | 53% | 2126 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 45,237 psi | 73% | 2283 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 38,667 psi | 62% | 2185 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 32,460 psi | 52% | 2129 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 92% | 30,922 psi | 50% | 2162 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,022 psi | 47% | 2014 fps | 96.1% |
| Winchester 748 | <<locked>> | 80% | 44,469 psi | 71% | 2320 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 41,017 psi | 66% | 2313 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,921 psi | 46% | 2165 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,799 psi | 65% | 2257 fps | 99.3% |
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 103 powders for 8.5 x 55 Blaser loaded with the .338 | 250gr | Hornady SP. Alliant Reloder-17 delivers the highest muzzle velocity at 2,585 fps; across all powders the maximum-charge window runs from 1,453 fps to 2,585 fps. Accurate 4350 gives the best case fill at 100 %, and 103 of the 103 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 53–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:15.0 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. 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 | Hornady SP 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.