Load Specifications
Bullet:.338 | 275gr | Swift A-Frame
Bullet Manufacturer:Swift
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:1:14.5
Load data in caliber 8.5 x 55 Blaser with .338 | 275gr | Swift A-Frame 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, Hodgdon Superformance 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.
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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>> | 84% | 55,361 psi | 89% | 2224 fps | 100% |
| Accurate 2495 | <<locked>> | 88% | 53,911 psi | 86% | 2251 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 55,825 psi | 90% | 2310 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 52,997 psi | 85% | 2260 fps | 97.9% |
| Accurate 3100ᴾ | <<locked>> | 100% | 40,625 psi | 65% | 2188 fps | 97.4% |
| Accurate 4064 | <<locked>> | 90% | 54,085 psi | 87% | 2293 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 53,374 psi | 86% | 2375 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 54,476 psi | 87% | 2323 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 55,405 psi | 89% | 2323 fps | 100% |
| ADI AR 2209ᴾ | <<locked>> | 100% | 48,631 psi | 78% | 2310 fps | 96.2% |
| ADI Benchmark 8208 | <<locked>> | 84% | 53,417 psi | 86% | 2277 fps | 100% |
| Alliant AR-Comp | <<locked>> | 84% | 54,534 psi | 87% | 2251 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 88% | 53,693 psi | 86% | 2425 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 55,448 psi | 89% | 2343 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 55,999 psi | 90% | 2359 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 54,563 psi | 87% | 2418 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 55,796 psi | 89% | 2448 fps | 100% |
| Alliant Reloder-19ᴾ | <<locked>> | 100% | 47,485 psi | 76% | 2303 fps | 96.2% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,131 psi | 63% | 2215 fps | 99.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,279 psi | 69% | 2349 fps | 99.2% |
| Baschieri & Pellagri 107 | <<locked>> | 86% | 53,896 psi | 86% | 2336 fps | 100% |
| Bofors RP3 | <<locked>> | 92% | 55,898 psi | 90% | 2352 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 55,898 psi | 90% | 2333 fps | 98.6% |
| Hodgdon Benchmark | <<locked>> | 84% | 55,230 psi | 89% | 2260 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 56,188 psi | 90% | 2346 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 54,462 psi | 87% | 2388 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 53,316 psi | 85% | 2326 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 98% | 56,086 psi | 90% | 2415 fps | 99.1% |
| Hodgdon H4350 | <<locked>> | 94% | 53,664 psi | 86% | 2339 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 86% | 55,056 psi | 88% | 2329 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 50,763 psi | 81% | 2310 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 88% | 54,288 psi | 87% | 2359 fps | 100% |
| Hodgdon Superformance | <<locked>> | 96% | 52,924 psi | 85% | 2405 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,534 psi | 57% | 1375 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 56,231 psi | 90% | 2329 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 55,042 psi | 88% | 2306 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 55,056 psi | 88% | 2306 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 54,795 psi | 88% | 2293 fps | 98.8% |
| IMR 4350ᴾ | <<locked>> | 100% | 55,999 psi | 90% | 2359 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 94% | 54,389 psi | 87% | 2316 fps | 98.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 53,693 psi | 86% | 2362 fps | 100% |
| IMR 4895 | <<locked>> | 88% | 53,795 psi | 86% | 2339 fps | 100% |
| IMR 8208 XBR | <<locked>> | 84% | 53,417 psi | 86% | 2277 fps | 100% |
| Lovex D073.6 | <<locked>> | 86% | 54,128 psi | 87% | 2300 fps | 100% |
| Lovex S060 | <<locked>> | 86% | 53,940 psi | 86% | 2257 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 54,810 psi | 88% | 2303 fps | 100% |
| Lovex S065 | <<locked>> | 96% | 53,693 psi | 86% | 2310 fps | 99.5% |
| Lovex S070 | <<locked>> | 98% | 54,650 psi | 88% | 2346 fps | 99% |
| Norma 201 | <<locked>> | 86% | 53,258 psi | 85% | 2274 fps | 100% |
| Norma 202 | <<locked>> | 86% | 53,853 psi | 86% | 2274 fps | 100% |
| Norma 203B | <<locked>> | 90% | 55,187 psi | 88% | 2349 fps | 100% |
| Norma 204 | <<locked>> | 98% | 53,040 psi | 85% | 2359 fps | 97.1% |
| Norma MRPᴾ | <<locked>> | 100% | 43,453 psi | 70% | 2313 fps | 96.9% |
| Norma URPᴾ | <<locked>> | 100% | 55,898 psi | 90% | 2405 fps | 100% |
| Ramshot Big Game | <<locked>> | 90% | 55,405 psi | 89% | 2372 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 54,621 psi | 88% | 2408 fps | 99.5% |
| Ramshot TAC | <<locked>> | 84% | 53,490 psi | 86% | 2300 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 84% | 53,040 psi | 85% | 2313 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 54,302 psi | 87% | 2280 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,100 psi | 58% | 1407 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 56,318 psi | 90% | 2297 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 53,751 psi | 86% | 2313 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 52,866 psi | 85% | 2372 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 55,608 psi | 89% | 2444 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 52,910 psi | 85% | 2395 fps | 99.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 56,289 psi | 90% | 2467 fps | 100% |
| Rottweil R 901 | <<locked>> | 84% | 54,346 psi | 87% | 2251 fps | 100% |
| Rottweil R 902 | <<locked>> | 88% | 53,708 psi | 86% | 2270 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 55,738 psi | 89% | 2346 fps | 100% |
| Rottweil R 905ᴾ | <<locked>> | 100% | 46,180 psi | 74% | 2287 fps | 96.2% |
| Rottweil R 907 | <<locked>> | 96% | 55,898 psi | 90% | 2333 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 96% | 53,693 psi | 86% | 2310 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 86% | 54,128 psi | 87% | 2300 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 54,810 psi | 88% | 2303 fps | 100% |
| Shooters World SW4350 | <<locked>> | 98% | 54,650 psi | 88% | 2346 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 54,012 psi | 87% | 2359 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 55,622 psi | 89% | 2326 fps | 99.9% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 56,231 psi | 90% | 2343 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 54,810 psi | 88% | 2215 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 54,955 psi | 88% | 2218 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 53,867 psi | 86% | 2274 fps | 98.7% |
| SNPE Vectan Tubal 8000ᴾ | <<locked>> | 100% | 45,774 psi | 73% | 2283 fps | 96% |
| Somchem S321 | <<locked>> | 82% | 54,592 psi | 88% | 2306 fps | 100% |
| Somchem S335 | <<locked>> | 86% | 54,099 psi | 87% | 2218 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 54,969 psi | 88% | 2313 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 56,028 psi | 90% | 2343 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 50,212 psi | 81% | 2362 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 46,659 psi | 75% | 2270 fps | 97.1% |
| Vihtavuori N130 | <<locked>> | 82% | 54,578 psi | 88% | 2178 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 55,071 psi | 88% | 2201 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 53,606 psi | 86% | 2238 fps | 100% |
| Vihtavuori N140 | <<locked>> | 88% | 54,288 psi | 87% | 2254 fps | 100% |
| Vihtavuori N150 | <<locked>> | 94% | 54,012 psi | 87% | 2283 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 55,071 psi | 88% | 2359 fps | 100% |
| Vihtavuori N530 | <<locked>> | 84% | 53,998 psi | 87% | 2277 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 55,680 psi | 89% | 2297 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 53,882 psi | 86% | 2365 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,757 psi | 69% | 2274 fps | 99.6% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 55,230 psi | 89% | 2343 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 53,795 psi | 86% | 2316 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 56,420 psi | 90% | 2421 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,867 psi | 56% | 2228 fps | 99.8% |
| Winchester StaBALL Match | <<locked>> | 88% | 56,144 psi | 90% | 2349 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% | 49,023 psi | 79% | 2152 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 41,727 psi | 67% | 2100 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 48,660 psi | 78% | 2224 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 40,944 psi | 66% | 2083 fps | 95.3% |
| Accurate 3100 | <<locked>> | 94% | 33,272 psi | 53% | 2057 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 39,508 psi | 63% | 2100 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 28,863 psi | 46% | 1969 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 45,150 psi | 72% | 2195 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 80% | 38,522 psi | 62% | 2077 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 98% | 45,774 psi | 73% | 2267 fps | 95.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 47,195 psi | 76% | 2195 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 47,674 psi | 76% | 2172 fps | 100% |
| Alliant Power Pro 2000-MR | 48.9 gr | 80% | 40,988 psi | 66% | 2231 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,189 psi | 61% | 2096 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,828 psi | 65% | 2146 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 29,675 psi | 48% | 1978 fps | 95.6% |
| Alliant Reloder-17 | 48.2 gr | 80% | 32,866 psi | 53% | 2083 fps | 98.6% |
| Alliant Reloder-19 | <<locked>> | 98% | 44,773 psi | 72% | 2257 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 86% | 25,672 psi | 41% | 1913 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 90% | 30,937 psi | 50% | 2096 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 44,237 psi | 71% | 2205 fps | 99.4% |
| Bofors RP3 | <<locked>> | 80% | 37,710 psi | 60% | 2100 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 38,653 psi | 62% | 2077 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,921 psi | 78% | 2182 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 45,977 psi | 74% | 2218 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 50,966 psi | 82% | 2343 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 38,508 psi | 62% | 2103 fps | 97.9% |
| Hodgdon H414 | <<locked>> | 86% | 38,116 psi | 61% | 2146 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 86% | 41,626 psi | 67% | 2162 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 45,556 psi | 73% | 2201 fps | 100% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,137 psi | 44% | 1900 fps | 96.4% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 41,626 psi | 67% | 2188 fps | 99.9% |
| Hodgdon Superformance | 56 gr | 88% | 40,059 psi | 64% | 2201 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,629 psi | 43% | 1227 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 43,801 psi | 70% | 2165 fps | 99.9% |
| IMR 3031 | <<locked>> | 80% | 45,484 psi | 73% | 2192 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,437 psi | 65% | 2103 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 80% | 42,888 psi | 69% | 2123 fps | 96.7% |
| IMR 4350 | <<locked>> | 88% | 38,841 psi | 62% | 2106 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 82% | 37,884 psi | 61% | 2064 fps | 95.2% |
| IMR 4831 | <<locked>> | 80% | 28,239 psi | 45% | 1939 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 41,843 psi | 67% | 2169 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 80% | 47,195 psi | 76% | 2195 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 44,309 psi | 71% | 2175 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 45,237 psi | 73% | 2139 fps | 99.9% |
| Lovex S062 | <<locked>> | 80% | 40,379 psi | 65% | 2106 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 33,098 psi | 53% | 1982 fps | 95.3% |
| Lovex S070 | <<locked>> | 86% | 37,695 psi | 60% | 2087 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 44,251 psi | 71% | 2152 fps | 100% |
| Norma 202 | <<locked>> | 80% | 44,643 psi | 72% | 2156 fps | 100% |
| Norma 203B | <<locked>> | 80% | 40,219 psi | 64% | 2136 fps | 99.5% |
| Norma 204 | <<locked>> | 94% | 46,369 psi | 74% | 2264 fps | 95.7% |
| Norma MRP | <<locked>> | 96% | 38,072 psi | 61% | 2215 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 29,457 psi | 47% | 1972 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 39,653 psi | 64% | 2152 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 34,940 psi | 56% | 2093 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 46,978 psi | 75% | 2208 fps | 98.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 46,673 psi | 75% | 2224 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 50,778 psi | 81% | 2238 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,006 psi | 43% | 1257 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 52,808 psi | 85% | 2254 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,015 psi | 63% | 2093 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 43,004 psi | 69% | 2234 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,998 psi | 56% | 2133 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 30,676 psi | 49% | 2028 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 33,069 psi | 53% | 2080 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 48,298 psi | 77% | 2175 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 42,279 psi | 68% | 2116 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 35,520 psi | 57% | 2057 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 98% | 43,134 psi | 69% | 2238 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 84% | 38,653 psi | 62% | 2077 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 33,098 psi | 53% | 1982 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 44,309 psi | 71% | 2175 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 40,379 psi | 65% | 2106 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 37,695 psi | 60% | 2087 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,390 psi | 58% | 2100 fps | 98.8% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 45,455 psi | 73% | 2192 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 43,569 psi | 70% | 2172 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 45,556 psi | 73% | 2103 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,985 psi | 61% | 2001 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 36,593 psi | 59% | 2018 fps | 95.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 42,830 psi | 69% | 2234 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 50,937 psi | 82% | 2260 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 45,165 psi | 72% | 2106 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 45,020 psi | 72% | 2185 fps | 99.8% |
| Somchem S355 | <<locked>> | 80% | 36,332 psi | 58% | 2060 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 26,498 psi | 42% | 1936 fps | 97.7% |
| Somchem S385 | <<locked>> | 94% | 38,609 psi | 62% | 2142 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 51,401 psi | 82% | 2146 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,934 psi | 74% | 2096 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 41,713 psi | 67% | 2093 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 42,177 psi | 68% | 2103 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 34,548 psi | 55% | 2008 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 30,748 psi | 49% | 1972 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 47,282 psi | 76% | 2192 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 40,553 psi | 65% | 2100 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 30,182 psi | 48% | 1975 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 86% | 27,311 psi | 44% | 1972 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,530 psi | 49% | 1955 fps | 97.9% |
| Winchester 748 | <<locked>> | 80% | 47,123 psi | 76% | 2234 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 38,116 psi | 61% | 2146 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 90% | 25,585 psi | 41% | 1972 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 43,033 psi | 69% | 2175 fps | 99.9% |
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 | 275gr | Swift A-Frame. ReloadSwiss RS 70 delivers the highest muzzle velocity at 2,467 fps; across all powders the maximum-charge window runs from 1,375 fps to 2,467 fps. Accurate 3100 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 56–90 %, leaving at least 10 % headroom. The 275.0 gr projectile in 0.338" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, ADI AR 2209, Alliant Reloder-16 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, Hodgdon Superformance, Alliant Reloder-17 rank at the top here: for 8.5 x 55 Blaser with the .338 | 275gr | Swift A-Frame 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.