Load Specifications
Bullet:.338 | 275gr | Speer SSP
Bullet Manufacturer:Speer
Bullet Weight:275 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:1:16.0
Load data in caliber 8.5 x 55 Blaser with .338 | 275gr | Speer SSP 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 Reloder-17, ReloadSwiss RS 60 and Winchester 760.
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>> | 82% | 53,388 psi | 86% | 2211 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 55,448 psi | 89% | 2274 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 53,388 psi | 86% | 2290 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,302 psi | 87% | 2290 fps | 98.3% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,032 psi | 67% | 2218 fps | 97.9% |
| Accurate 4064 | <<locked>> | 90% | 55,564 psi | 89% | 2320 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 54,926 psi | 88% | 2402 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 55,811 psi | 89% | 2349 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 53,403 psi | 86% | 2310 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 49,966 psi | 80% | 2343 fps | 96.8% |
| ADI Benchmark 8208 | <<locked>> | 84% | 54,723 psi | 88% | 2300 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 55,898 psi | 90% | 2270 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,172 psi | 88% | 2454 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 53,243 psi | 85% | 2323 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 53,780 psi | 86% | 2343 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 56,188 psi | 90% | 2448 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 53,795 psi | 86% | 2434 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 48,820 psi | 78% | 2333 fps | 96.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,132 psi | 64% | 2244 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 35,534 psi | 57% | 2162 fps | 96.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 44,730 psi | 72% | 2385 fps | 99.5% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 55,347 psi | 89% | 2365 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 53,824 psi | 86% | 2339 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 53,737 psi | 86% | 2320 fps | 98.5% |
| Hodgdon Benchmark | <<locked>> | 84% | 56,217 psi | 90% | 2280 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 53,911 psi | 86% | 2329 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 56,144 psi | 90% | 2418 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 54,795 psi | 88% | 2356 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 96% | 54,099 psi | 87% | 2402 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 94% | 55,013 psi | 88% | 2369 fps | 98.1% |
| Hodgdon H4895 | <<locked>> | 86% | 56,362 psi | 90% | 2352 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 52,446 psi | 84% | 2343 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 55,506 psi | 89% | 2382 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 54,520 psi | 87% | 2438 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,650 psi | 57% | 1385 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 53,983 psi | 87% | 2313 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 52,968 psi | 85% | 2290 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 56,260 psi | 90% | 2333 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 55,883 psi | 90% | 2320 fps | 99.1% |
| IMR 4350 | <<locked>> | 98% | 53,998 psi | 87% | 2346 fps | 98.5% |
| IMR 4451 Enduron | <<locked>> | 94% | 55,666 psi | 89% | 2346 fps | 99% |
| IMR 4831ᴾ | <<locked>> | 100% | 55,361 psi | 89% | 2392 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 55,100 psi | 88% | 2365 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 54,723 psi | 88% | 2300 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 55,535 psi | 89% | 2323 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,201 psi | 89% | 2283 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 56,115 psi | 90% | 2329 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,042 psi | 88% | 2339 fps | 99.7% |
| Lovex S070 | <<locked>> | 98% | 55,970 psi | 90% | 2372 fps | 99.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 35,012 psi | 56% | 2096 fps | 96% |
| Norma 201 | <<locked>> | 86% | 54,592 psi | 88% | 2300 fps | 100% |
| Norma 202 | <<locked>> | 86% | 54,897 psi | 88% | 2293 fps | 100% |
| Norma 203B | <<locked>> | 90% | 56,434 psi | 90% | 2372 fps | 100% |
| Norma 204 | <<locked>> | 98% | 54,476 psi | 87% | 2388 fps | 97.6% |
| Norma MRPᴾ | <<locked>> | 100% | 44,860 psi | 72% | 2349 fps | 97.5% |
| Norma URP | <<locked>> | 98% | 53,969 psi | 87% | 2392 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 53,359 psi | 86% | 2356 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 56,072 psi | 90% | 2438 fps | 99.7% |
| Ramshot TAC | <<locked>> | 84% | 54,868 psi | 88% | 2329 fps | 99.7% |
| Ramshot Wild Boar | <<locked>> | 84% | 54,534 psi | 87% | 2339 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,477 psi | 89% | 2306 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,216 psi | 58% | 1421 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 54,781 psi | 88% | 2339 fps | 99.3% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,244 psi | 87% | 2398 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 53,417 psi | 86% | 2428 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 54,549 psi | 87% | 2425 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 53,998 psi | 87% | 2451 fps | 99.9% |
| Rottweil R 901 | <<locked>> | 84% | 55,550 psi | 89% | 2274 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,042 psi | 88% | 2297 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 53,708 psi | 86% | 2333 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 51,692 psi | 83% | 2320 fps | 96% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 47,587 psi | 76% | 2320 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 94% | 53,737 psi | 86% | 2320 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,042 psi | 88% | 2339 fps | 99.7% |
| Shooters World Match Rifle | <<locked>> | 86% | 55,535 psi | 89% | 2323 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 56,115 psi | 90% | 2329 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 55,970 psi | 90% | 2372 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,419 psi | 89% | 2385 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,258 psi | 85% | 2310 fps | 99.8% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 53,983 psi | 87% | 2323 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 55,912 psi | 90% | 2238 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 55,970 psi | 90% | 2238 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 55,405 psi | 89% | 2303 fps | 99% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 47,195 psi | 76% | 2316 fps | 96.6% |
| Somchem S321 | <<locked>> | 82% | 55,825 psi | 90% | 2329 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,419 psi | 89% | 2241 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 56,405 psi | 90% | 2343 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 53,983 psi | 87% | 2329 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 51,938 psi | 83% | 2392 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,080 psi | 77% | 2300 fps | 97.6% |
| Vihtavuori N130 | <<locked>> | 82% | 55,811 psi | 89% | 2201 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 56,188 psi | 90% | 2224 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 54,810 psi | 88% | 2260 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 55,593 psi | 89% | 2277 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,448 psi | 89% | 2310 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 52,852 psi | 85% | 2343 fps | 99.9% |
| Vihtavuori N530 | <<locked>> | 84% | 55,071 psi | 88% | 2300 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 53,635 psi | 86% | 2280 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,463 psi | 89% | 2395 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,324 psi | 71% | 2306 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 52,779 psi | 85% | 2323 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,143 psi | 88% | 2343 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,346 psi | 87% | 2405 fps | 99.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,882 psi | 58% | 2264 fps | 99.9% |
| Winchester StaBALL Match | <<locked>> | 86% | 53,838 psi | 86% | 2333 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% | 50,299 psi | 81% | 2175 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 42,946 psi | 69% | 2123 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,009 psi | 80% | 2251 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,018 psi | 67% | 2113 fps | 95.9% |
| Accurate 3100 | <<locked>> | 94% | 34,432 psi | 55% | 2087 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 40,654 psi | 65% | 2126 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 29,805 psi | 48% | 1998 fps | 96% |
| ADI AR 2206H | <<locked>> | 80% | 46,180 psi | 74% | 2221 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 39,276 psi | 63% | 2100 fps | 99% |
| ADI AR 2209 | <<locked>> | 96% | 43,918 psi | 70% | 2247 fps | 95.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,254 psi | 77% | 2221 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,066 psi | 79% | 2195 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,105 psi | 68% | 2260 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,233 psi | 63% | 2123 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 41,887 psi | 67% | 2172 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,443 psi | 49% | 2008 fps | 96.2% |
| Alliant Reloder-17 | 49.4 gr | 80% | 33,663 psi | 54% | 2110 fps | 98.9% |
| Alliant Reloder-19 | <<locked>> | 96% | 43,091 psi | 69% | 2241 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 84% | 24,831 psi | 40% | 1896 fps | 95% |
| Alliant Reloder-25 | <<locked>> | 98% | 33,402 psi | 54% | 2116 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 90% | 31,836 psi | 51% | 2129 fps | 96% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,426 psi | 73% | 2231 fps | 99.6% |
| Bofors RP3 | <<locked>> | 80% | 38,725 psi | 62% | 2126 fps | 99.8% |
| Bofors RP7 | <<locked>> | 84% | 39,726 psi | 64% | 2106 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 49,966 psi | 80% | 2205 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,239 psi | 76% | 2244 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 52,359 psi | 84% | 2372 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,450 psi | 63% | 2129 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 84% | 36,695 psi | 59% | 2129 fps | 95.4% |
| Hodgdon H4350 | <<locked>> | 86% | 42,714 psi | 68% | 2192 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 46,659 psi | 75% | 2228 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,934 psi | 45% | 1929 fps | 97% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 42,670 psi | 68% | 2211 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 38,551 psi | 62% | 2185 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,731 psi | 43% | 1237 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 44,817 psi | 72% | 2192 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 46,572 psi | 75% | 2211 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,263 psi | 66% | 2126 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 80% | 43,787 psi | 70% | 2146 fps | 97.2% |
| IMR 4350 | <<locked>> | 88% | 39,827 psi | 64% | 2133 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 36,550 psi | 59% | 2047 fps | 95% |
| IMR 4831 | <<locked>> | 80% | 29,109 psi | 47% | 1965 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 42,931 psi | 69% | 2195 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 80% | 48,254 psi | 77% | 2221 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 45,672 psi | 73% | 2201 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,050 psi | 74% | 2162 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 41,234 psi | 66% | 2126 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 34,011 psi | 55% | 2008 fps | 95.9% |
| Lovex S070 | <<locked>> | 84% | 36,376 psi | 58% | 2073 fps | 95.4% |
| Lovex S071 | <<locked>> | 98% | 32,909 psi | 53% | 2057 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 45,339 psi | 73% | 2178 fps | 100% |
| Norma 202 | <<locked>> | 80% | 45,788 psi | 73% | 2182 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,263 psi | 66% | 2162 fps | 99.7% |
| Norma 204 | <<locked>> | 92% | 44,802 psi | 72% | 2251 fps | 95.5% |
| Norma MRP | <<locked>> | 94% | 36,840 psi | 59% | 2201 fps | 95% |
| Norma URP | <<locked>> | 80% | 30,313 psi | 49% | 1998 fps | 96% |
| Ramshot Big Game | <<locked>> | 80% | 40,828 psi | 65% | 2178 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 84% | 33,663 psi | 54% | 2077 fps | 95.2% |
| Ramshot TAC | <<locked>> | 80% | 48,066 psi | 77% | 2238 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 47,630 psi | 76% | 2251 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 80% | 51,938 psi | 83% | 2264 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,108 psi | 43% | 1266 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,871 psi | 64% | 2116 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,440 psi | 71% | 2264 fps | 99.7% |
| ReloadSwiss RS 60 | 49.4 gr | 80% | 35,839 psi | 57% | 2159 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 29,660 psi | 48% | 2011 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 31,836 psi | 51% | 2060 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 49,501 psi | 79% | 2201 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,105 psi | 69% | 2139 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 36,535 psi | 59% | 2083 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 98% | 48,457 psi | 78% | 2274 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 96% | 41,756 psi | 67% | 2228 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 84% | 39,726 psi | 64% | 2106 fps | 95.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,011 psi | 55% | 2008 fps | 95.9% |
| Shooters World Match Rifle | <<locked>> | 80% | 45,672 psi | 73% | 2201 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,234 psi | 66% | 2126 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 36,376 psi | 58% | 2073 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,536 psi | 60% | 2126 fps | 99.1% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 46,615 psi | 75% | 2218 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 44,788 psi | 72% | 2198 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 46,731 psi | 75% | 2129 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,015 psi | 63% | 2024 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 37,652 psi | 60% | 2047 fps | 95.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 41,394 psi | 66% | 2221 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 52,170 psi | 84% | 2287 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,238 psi | 74% | 2129 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,224 psi | 74% | 2211 fps | 99.9% |
| Somchem S355 | <<locked>> | 80% | 37,347 psi | 60% | 2087 fps | 99.4% |
| Somchem S365 | <<locked>> | 80% | 27,238 psi | 44% | 1965 fps | 98.2% |
| Somchem S385 | <<locked>> | 94% | 39,769 psi | 64% | 2172 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 52,620 psi | 84% | 2169 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,108 psi | 76% | 2119 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 42,917 psi | 69% | 2116 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,221 psi | 69% | 2126 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,505 psi | 57% | 2031 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 31,589 psi | 51% | 1998 fps | 96.4% |
| Vihtavuori N530 | <<locked>> | 80% | 48,356 psi | 78% | 2218 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 41,495 psi | 67% | 2123 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 31,024 psi | 50% | 2001 fps | 96% |
| Vihtavuori N555 | <<locked>> | 84% | 26,469 psi | 42% | 1955 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,299 psi | 50% | 1982 fps | 98.3% |
| Winchester 748 | <<locked>> | 80% | 48,196 psi | 77% | 2257 fps | 100% |
| Winchester 760 | 50.8 gr | 84% | 36,695 psi | 59% | 2129 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 88% | 24,642 psi | 40% | 1952 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,237 psi | 71% | 2201 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 121 powders for 8.5 x 55 Blaser loaded with the .338 | 275gr | Speer SSP. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,454 fps; across all powders the maximum-charge window runs from 1,385 fps to 2,454 fps. Accurate 3100 gives the best case fill at 100 %, and 121 of the 121 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 275.0 gr projectile in 0.338" calls for a 1:16.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, 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 Reloder-17, ReloadSwiss RS 60, Winchester 760 rank at the top here: for 8.5 x 55 Blaser with the .338 | 275gr | Speer SSP they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate MAGPRO, ADI AR 2213, Bofors RP15 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.