Load Specifications
Bullet:.338 | 275gr | Speer AGS TS
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:1:16.5
Load data in caliber 8.5 x 55 Blaser with .338 | 275gr | Speer AGS TS bullet and 108 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 ReloadSwiss RS 70.
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% | 54,027 psi | 87% | 2221 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 56,057 psi | 90% | 2283 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 53,954 psi | 87% | 2300 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 54,737 psi | 88% | 2300 fps | 98.4% |
| Accurate 3100ᴾ | <<locked>> | 100% | 42,743 psi | 69% | 2234 fps | 98.1% |
| Accurate 4064 | <<locked>> | 90% | 56,159 psi | 90% | 2329 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 55,709 psi | 89% | 2415 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 56,347 psi | 90% | 2359 fps | 100% |
| ADI AR 2208 | <<locked>> | 90% | 53,925 psi | 86% | 2320 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 50,546 psi | 81% | 2356 fps | 97% |
| ADI Benchmark 8208 | <<locked>> | 84% | 55,288 psi | 89% | 2313 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 56,304 psi | 90% | 2280 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 55,941 psi | 90% | 2467 fps | 100% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 50,140 psi | 80% | 2356 fps | 97.1% |
| Alliant Power Pro Varmintᴾ | <<locked>> | 100% | 50,140 psi | 80% | 2356 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 54,056 psi | 87% | 2339 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 88% | 54,607 psi | 88% | 2359 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 98% | 53,432 psi | 86% | 2418 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 94% | 54,520 psi | 87% | 2448 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 49,400 psi | 79% | 2349 fps | 97% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,698 psi | 65% | 2257 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 35,984 psi | 58% | 2178 fps | 96.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 45,484 psi | 73% | 2402 fps | 99.6% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 56,086 psi | 90% | 2379 fps | 100% |
| Bofors RP3 | <<locked>> | 90% | 54,360 psi | 87% | 2349 fps | 100% |
| Bofors RP7 | <<locked>> | 94% | 54,462 psi | 87% | 2333 fps | 98.6% |
| Hodgdon Benchmark | <<locked>> | 82% | 53,461 psi | 86% | 2254 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 84% | 54,462 psi | 87% | 2343 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 55,245 psi | 89% | 2365 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 96% | 54,824 psi | 88% | 2415 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 94% | 55,419 psi | 89% | 2382 fps | 98.3% |
| Hodgdon H4895 | <<locked>> | 84% | 53,519 psi | 86% | 2326 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 53,229 psi | 85% | 2356 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 56,362 psi | 90% | 2398 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 55,042 psi | 88% | 2451 fps | 99% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,853 psi | 57% | 1394 fps | 100% |
| Hodgdon VARGET | <<locked>> | 86% | 54,505 psi | 87% | 2323 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 53,693 psi | 86% | 2303 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 53,345 psi | 86% | 2303 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 86% | 53,272 psi | 85% | 2290 fps | 98.8% |
| IMR 4350 | <<locked>> | 98% | 54,665 psi | 88% | 2359 fps | 98.7% |
| IMR 4451 Enduron | <<locked>> | 94% | 56,347 psi | 90% | 2359 fps | 99.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 56,101 psi | 90% | 2408 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 55,999 psi | 90% | 2382 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 55,288 psi | 89% | 2313 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 56,072 psi | 90% | 2333 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 55,753 psi | 89% | 2293 fps | 100% |
| Lovex S062 | <<locked>> | 88% | 53,200 psi | 85% | 2297 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 55,738 psi | 89% | 2352 fps | 99.8% |
| Lovex S070 | <<locked>> | 96% | 53,229 psi | 85% | 2343 fps | 99% |
| Lovex S071ᴾ | <<locked>> | 100% | 35,650 psi | 57% | 2113 fps | 96.3% |
| Norma 201 | <<locked>> | 86% | 55,172 psi | 88% | 2310 fps | 100% |
| Norma 202 | <<locked>> | 86% | 55,492 psi | 89% | 2306 fps | 100% |
| Norma 203B | <<locked>> | 88% | 53,809 psi | 86% | 2346 fps | 100% |
| Norma 204 | <<locked>> | 98% | 55,100 psi | 88% | 2402 fps | 97.8% |
| Norma MRPᴾ | <<locked>> | 100% | 45,411 psi | 73% | 2362 fps | 97.7% |
| Norma URP | <<locked>> | 98% | 54,737 psi | 88% | 2405 fps | 100% |
| Ramshot Big Game | <<locked>> | 88% | 54,099 psi | 87% | 2369 fps | 100% |
| Ramshot Hunter | <<locked>> | 98% | 53,301 psi | 85% | 2405 fps | 99.5% |
| Ramshot TAC | <<locked>> | 84% | 55,303 psi | 89% | 2339 fps | 99.8% |
| Ramshot Wild Boar | <<locked>> | 84% | 55,013 psi | 88% | 2349 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 55,999 psi | 90% | 2316 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,419 psi | 58% | 1427 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 55,506 psi | 89% | 2352 fps | 99.4% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 54,897 psi | 88% | 2411 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 54,186 psi | 87% | 2441 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 55,216 psi | 89% | 2438 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 54,578 psi | 88% | 2464 fps | 100% |
| Rottweil R 901 | <<locked>> | 84% | 56,188 psi | 90% | 2287 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 55,608 psi | 89% | 2310 fps | 100% |
| Rottweil R 903 | <<locked>> | 92% | 54,259 psi | 87% | 2343 fps | 100% |
| Rottweil R 904ᴾ | <<locked>> | 100% | 52,330 psi | 84% | 2333 fps | 96.2% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 48,298 psi | 77% | 2336 fps | 97% |
| Rottweil R 907 | <<locked>> | 94% | 54,462 psi | 87% | 2333 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 96% | 55,738 psi | 89% | 2352 fps | 99.8% |
| Shooters World Match Rifle | <<locked>> | 86% | 56,072 psi | 90% | 2333 fps | 100% |
| Shooters World Precision | <<locked>> | 88% | 53,200 psi | 85% | 2297 fps | 100% |
| Shooters World SW4350 | <<locked>> | 96% | 53,229 psi | 85% | 2343 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 55,912 psi | 90% | 2398 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 53,766 psi | 86% | 2320 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 86% | 54,520 psi | 87% | 2336 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 53,301 psi | 85% | 2215 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 53,229 psi | 85% | 2215 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 56,028 psi | 90% | 2316 fps | 99.1% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 47,848 psi | 77% | 2329 fps | 96.9% |
| Somchem S321 | <<locked>> | 82% | 56,391 psi | 90% | 2343 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 55,970 psi | 90% | 2251 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 53,461 psi | 86% | 2310 fps | 100% |
| Somchem S355 | <<locked>> | 92% | 54,839 psi | 88% | 2343 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 52,707 psi | 85% | 2405 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 48,950 psi | 78% | 2320 fps | 97.8% |
| Vihtavuori N130 | <<locked>> | 82% | 56,159 psi | 90% | 2211 fps | 100% |
| Vihtavuori N133 | <<locked>> | 84% | 53,650 psi | 86% | 2198 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 55,434 psi | 89% | 2270 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 56,115 psi | 90% | 2290 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 55,956 psi | 90% | 2320 fps | 100% |
| Vihtavuori N160 | <<locked>> | 96% | 53,606 psi | 86% | 2356 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 42,163 psi | 68% | 2201 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 84% | 55,637 psi | 89% | 2310 fps | 100% |
| Vihtavuori N540 | <<locked>> | 88% | 54,143 psi | 87% | 2290 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 56,130 psi | 90% | 2408 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 44,831 psi | 72% | 2316 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 53,592 psi | 86% | 2339 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 55,680 psi | 89% | 2352 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 55,056 psi | 88% | 2421 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,521 psi | 59% | 2283 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 86% | 54,592 psi | 88% | 2346 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 45,919 psi | 74% | 2264 fps | 96% |
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% | 50,691 psi | 81% | 2182 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 43,598 psi | 70% | 2136 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 50,604 psi | 81% | 2260 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 42,482 psi | 68% | 2126 fps | 96.1% |
| Accurate 3100 | <<locked>> | 92% | 32,576 psi | 52% | 2054 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 41,263 psi | 66% | 2139 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,313 psi | 49% | 2011 fps | 96.3% |
| ADI AR 2206H | <<locked>> | 80% | 46,760 psi | 75% | 2231 fps | 100% |
| ADI AR 2208 | <<locked>> | 80% | 39,827 psi | 64% | 2113 fps | 99.1% |
| ADI AR 2209 | <<locked>> | 96% | 44,498 psi | 71% | 2264 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 48,863 psi | 78% | 2231 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 49,516 psi | 79% | 2205 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 42,598 psi | 68% | 2274 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 44,208 psi | 71% | 2264 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 96% | 44,208 psi | 71% | 2264 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,581 psi | 63% | 2133 fps | 99.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 42,453 psi | 68% | 2185 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,705 psi | 49% | 2018 fps | 96.4% |
| Alliant Reloder-17 | 50 gr | 80% | 34,098 psi | 55% | 2123 fps | 99.1% |
| Alliant Reloder-19 | <<locked>> | 96% | 43,627 psi | 70% | 2257 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 84% | 25,164 psi | 40% | 1909 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 98% | 33,852 psi | 54% | 2133 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 88% | 30,182 psi | 48% | 2093 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 45,905 psi | 74% | 2244 fps | 99.6% |
| Bofors RP3 | <<locked>> | 80% | 39,262 psi | 63% | 2139 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 37,753 psi | 61% | 2073 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 50,546 psi | 81% | 2218 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 47,776 psi | 77% | 2257 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 39,958 psi | 64% | 2142 fps | 98.4% |
| Hodgdon H414 | <<locked>> | 84% | 37,130 psi | 60% | 2142 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 84% | 40,553 psi | 65% | 2159 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 47,224 psi | 76% | 2241 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,195 psi | 45% | 1939 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 43,236 psi | 69% | 2224 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 38,870 psi | 62% | 2198 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,789 psi | 43% | 1243 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 45,136 psi | 72% | 2198 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 47,239 psi | 76% | 2224 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,800 psi | 67% | 2139 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 80% | 44,251 psi | 71% | 2159 fps | 97.3% |
| IMR 4350 | <<locked>> | 86% | 37,811 psi | 61% | 2100 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 36,796 psi | 59% | 2057 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 29,544 psi | 47% | 1978 fps | 96% |
| IMR 4895 | <<locked>> | 80% | 43,482 psi | 70% | 2211 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 80% | 48,863 psi | 78% | 2231 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 46,006 psi | 74% | 2211 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 46,572 psi | 75% | 2175 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 41,785 psi | 67% | 2139 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 34,461 psi | 55% | 2021 fps | 96.1% |
| Lovex S070 | <<locked>> | 84% | 36,796 psi | 59% | 2083 fps | 95.7% |
| Lovex S071 | <<locked>> | 98% | 33,344 psi | 53% | 2067 fps | 95.5% |
| Norma 201 | <<locked>> | 80% | 45,948 psi | 74% | 2192 fps | 100% |
| Norma 202 | <<locked>> | 80% | 46,151 psi | 74% | 2188 fps | 100% |
| Norma 203B | <<locked>> | 80% | 41,800 psi | 67% | 2175 fps | 99.7% |
| Norma 204 | <<locked>> | 92% | 45,179 psi | 72% | 2260 fps | 95.7% |
| Norma MRP | <<locked>> | 94% | 37,347 psi | 60% | 2218 fps | 95.3% |
| Norma URP | <<locked>> | 80% | 30,777 psi | 49% | 2014 fps | 96.3% |
| Ramshot Big Game | <<locked>> | 80% | 41,336 psi | 66% | 2192 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 34,026 psi | 55% | 2090 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 48,559 psi | 78% | 2247 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 48,385 psi | 78% | 2264 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 80% | 52,431 psi | 84% | 2274 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,166 psi | 44% | 1273 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,321 psi | 65% | 2129 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 44,817 psi | 72% | 2274 fps | 99.8% |
| ReloadSwiss RS 60 | 50 gr | 80% | 36,289 psi | 58% | 2172 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 30,081 psi | 48% | 2024 fps | 95.7% |
| ReloadSwiss RS 70 | 52.1 gr | 82% | 32,155 psi | 52% | 2073 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 49,879 psi | 80% | 2211 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 43,729 psi | 70% | 2152 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 37,115 psi | 60% | 2096 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 98% | 49,110 psi | 79% | 2290 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 96% | 42,351 psi | 68% | 2241 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 82% | 37,753 psi | 61% | 2073 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,461 psi | 55% | 2021 fps | 96.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 46,006 psi | 74% | 2211 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 41,785 psi | 67% | 2139 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 36,796 psi | 59% | 2083 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,797 psi | 61% | 2136 fps | 99.2% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 47,166 psi | 76% | 2231 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 45,049 psi | 72% | 2208 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 47,079 psi | 75% | 2136 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,320 psi | 63% | 2034 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 35,723 psi | 57% | 2014 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 96% | 41,959 psi | 67% | 2238 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 52,750 psi | 85% | 2297 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 46,775 psi | 75% | 2142 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 46,717 psi | 75% | 2224 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 37,855 psi | 61% | 2100 fps | 99.5% |
| Somchem S365 | <<locked>> | 80% | 27,528 psi | 44% | 1975 fps | 98.4% |
| Somchem S385 | <<locked>> | 92% | 37,681 psi | 60% | 2139 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 52,982 psi | 85% | 2175 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 47,471 psi | 76% | 2126 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 43,366 psi | 70% | 2126 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 43,816 psi | 70% | 2139 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 35,984 psi | 58% | 2044 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 80% | 32,039 psi | 51% | 2011 fps | 96.6% |
| Vihtavuori N165 | <<locked>> | 98% | 39,566 psi | 63% | 2159 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 48,936 psi | 78% | 2228 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 42,032 psi | 67% | 2133 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 31,444 psi | 50% | 2014 fps | 96.2% |
| Vihtavuori N555 | <<locked>> | 84% | 26,876 psi | 43% | 1972 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,618 psi | 51% | 1991 fps | 98.5% |
| Winchester 748 | <<locked>> | 80% | 48,776 psi | 78% | 2270 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 37,130 psi | 60% | 2142 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 88% | 25,034 psi | 40% | 1972 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 44,759 psi | 72% | 2215 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 98% | 42,960 psi | 69% | 2218 fps | 95.2% |
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 108 powders for 8.5 x 55 Blaser loaded with the .338 | 275gr | Speer AGS TS. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,467 fps; across all powders the maximum-charge window runs from 1,394 fps to 2,467 fps. Accurate 3100 gives the best case fill at 100 %, and 108 of the 108 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 275.0 gr projectile in 0.338" calls for a 1:16.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Power Pro Varmint 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, ReloadSwiss RS 70 rank at the top here: for 8.5 x 55 Blaser with the .338 | 275gr | Speer AGS TS 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.