Load Specifications
Bullet:.338 | 250gr | Swift A-Frame
Bullet Manufacturer:Swift
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:1:15.5
Load data in caliber 8.5 x 55 Blaser with .338 | 250gr | Swift A-Frame bullet and 101 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and Alliant Power Pro 2000-MR.
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>> | 84% | 53,272 psi | 85% | 2329 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,824 psi | 88% | 2395 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,853 psi | 88% | 2395 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 53,214 psi | 85% | 2411 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 54,375 psi | 87% | 2398 fps | 97.4% |
| Accurate 4064 | <<locked>> | 92% | 54,839 psi | 88% | 2438 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 54,012 psi | 87% | 2513 fps | 99.8% |
| ADI AR 2206H | <<locked>> | 88% | 55,666 psi | 89% | 2467 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 56,405 psi | 90% | 2464 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,723 psi | 88% | 2421 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 55,332 psi | 89% | 2395 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,100 psi | 88% | 2575 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 56,173 psi | 90% | 2484 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 56,159 psi | 90% | 2369 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 53,679 psi | 86% | 2464 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,301 psi | 84% | 2516 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 96% | 53,098 psi | 85% | 2549 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,115 psi | 60% | 2290 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,133 psi | 66% | 2425 fps | 97.9% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 55,361 psi | 89% | 2484 fps | 99.9% |
| Bofors RP3 | <<locked>> | 92% | 53,171 psi | 85% | 2454 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 53,737 psi | 86% | 2431 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 84% | 53,142 psi | 85% | 2362 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,708 psi | 86% | 2451 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,753 psi | 89% | 2539 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 55,230 psi | 89% | 2408 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 56,202 psi | 90% | 2438 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,288 psi | 87% | 2467 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 98% | 53,374 psi | 86% | 2510 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 96% | 54,418 psi | 87% | 2477 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 88% | 56,188 psi | 90% | 2474 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 48,457 psi | 78% | 2408 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 55,056 psi | 88% | 2503 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 54,317 psi | 87% | 2546 fps | 97.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,534 psi | 57% | 1457 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,940 psi | 86% | 2431 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 56,014 psi | 90% | 2454 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,869 psi | 90% | 2448 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 90% | 56,231 psi | 90% | 2438 fps | 98.4% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,592 psi | 86% | 2451 fps | 97.6% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,463 psi | 89% | 2454 fps | 98.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 51,068 psi | 82% | 2461 fps | 99.6% |
| IMR 4895 | <<locked>> | 90% | 55,027 psi | 88% | 2487 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 54,723 psi | 88% | 2421 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,926 psi | 88% | 2411 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 55,245 psi | 89% | 2444 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 55,172 psi | 88% | 2398 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 55,796 psi | 89% | 2444 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 54,839 psi | 88% | 2451 fps | 99.2% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,593 psi | 89% | 2480 fps | 98.5% |
| Norma 201 | <<locked>> | 88% | 54,259 psi | 87% | 2415 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,752 psi | 88% | 2418 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,956 psi | 90% | 2490 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 53,969 psi | 87% | 2490 fps | 96.3% |
| Norma URPᴾ | <<locked>> | 100% | 53,301 psi | 85% | 2503 fps | 99.7% |
| Ramshot Big Game | <<locked>> | 90% | 53,113 psi | 85% | 2474 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,866 psi | 83% | 2497 fps | 98.6% |
| Ramshot TAC | <<locked>> | 86% | 54,926 psi | 88% | 2444 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 86% | 54,389 psi | 87% | 2457 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,724 psi | 89% | 2428 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,781 psi | 57% | 1490 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 54,317 psi | 87% | 2405 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,882 psi | 88% | 2454 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 53,853 psi | 86% | 2520 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 53,127 psi | 85% | 2549 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,592 psi | 86% | 2536 fps | 99.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,577 psi | 86% | 2559 fps | 99.5% |
| Rottweil R 901 | <<locked>> | 86% | 55,390 psi | 89% | 2398 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,694 psi | 88% | 2415 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 53,040 psi | 85% | 2444 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 53,737 psi | 86% | 2431 fps | 97.5% |
| Shooters World Long Rifle | <<locked>> | 98% | 54,839 psi | 88% | 2451 fps | 99.2% |
| Shooters World Match Rifle | <<locked>> | 88% | 55,245 psi | 89% | 2444 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,796 psi | 89% | 2444 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,593 psi | 89% | 2480 fps | 98.5% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,882 psi | 88% | 2503 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 53,200 psi | 85% | 2425 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,940 psi | 86% | 2444 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,985 psi | 90% | 2359 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,999 psi | 90% | 2359 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,998 psi | 88% | 2408 fps | 98.1% |
| Somchem S321 | <<locked>> | 84% | 55,825 psi | 90% | 2454 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 55,172 psi | 88% | 2359 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 52,852 psi | 85% | 2418 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 53,534 psi | 86% | 2444 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 47,616 psi | 76% | 2457 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,985 psi | 90% | 2326 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 56,144 psi | 90% | 2346 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 54,259 psi | 87% | 2379 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 55,332 psi | 89% | 2398 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,969 psi | 88% | 2425 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 55,825 psi | 90% | 2497 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 86% | 55,042 psi | 88% | 2421 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 53,301 psi | 85% | 2398 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,708 psi | 88% | 2503 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,118 psi | 64% | 2356 fps | 98.7% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 56,231 psi | 90% | 2480 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 54,969 psi | 88% | 2464 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 53,679 psi | 86% | 2513 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,054 psi | 53% | 2287 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 88% | 53,621 psi | 86% | 2451 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% | 47,065 psi | 75% | 2254 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,445 psi | 82% | 2356 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,856 psi | 64% | 2195 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 46,528 psi | 75% | 2323 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 44,860 psi | 72% | 2260 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 37,681 psi | 60% | 2192 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 31,270 psi | 50% | 2133 fps | 95.3% |
| ADI AR 2206H | <<locked>> | 80% | 43,337 psi | 69% | 2287 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 80% | 36,898 psi | 59% | 2159 fps | 97.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,382 psi | 73% | 2293 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 45,643 psi | 73% | 2277 fps | 100% |
| Alliant Power Pro 2000-MR | 50.7 gr | 80% | 39,175 psi | 63% | 2316 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,332 psi | 58% | 2178 fps | 98.9% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,939 psi | 85% | 2329 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,088 psi | 63% | 2234 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,111 psi | 51% | 2142 fps | 95.5% |
| Alliant Reloder-17 | 49.9 gr | 80% | 31,270 psi | 50% | 2152 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 90% | 27,572 psi | 44% | 2064 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 94% | 33,431 psi | 54% | 2260 fps | 95% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,293 psi | 68% | 2293 fps | 98.5% |
| Bofors RP3 | <<locked>> | 80% | 35,868 psi | 58% | 2185 fps | 98.9% |
| Bofors RP7 | <<locked>> | 90% | 44,701 psi | 72% | 2293 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 47,253 psi | 76% | 2283 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,932 psi | 70% | 2313 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,443 psi | 78% | 2438 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 80% | 52,054 psi | 83% | 2372 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 52,837 psi | 85% | 2395 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,724 psi | 59% | 2185 fps | 96.5% |
| Hodgdon H414 | <<locked>> | 90% | 41,307 psi | 66% | 2320 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 92% | 48,022 psi | 77% | 2382 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 43,700 psi | 70% | 2297 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,586 psi | 44% | 2011 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,523 psi | 63% | 2274 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 92% | 43,903 psi | 70% | 2385 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,295 psi | 42% | 1296 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,090 psi | 67% | 2257 fps | 99.5% |
| IMR 3031 | <<locked>> | 80% | 43,308 psi | 69% | 2290 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,725 psi | 62% | 2188 fps | 98.3% |
| IMR 4166 Enduron | <<locked>> | 80% | 41,278 psi | 66% | 2208 fps | 95.3% |
| IMR 4350 | <<locked>> | 94% | 44,469 psi | 71% | 2316 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 41,191 psi | 66% | 2234 fps | 95.2% |
| IMR 4831 | <<locked>> | 84% | 30,560 psi | 49% | 2096 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 40,016 psi | 64% | 2260 fps | 99% |
| IMR 8208 XBR | <<locked>> | 80% | 45,382 psi | 73% | 2293 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 51,285 psi | 82% | 2365 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 42,395 psi | 68% | 2274 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,511 psi | 70% | 2231 fps | 99.4% |
| Lovex S062 | <<locked>> | 80% | 38,595 psi | 62% | 2192 fps | 99.5% |
| Lovex S065 | <<locked>> | 84% | 35,824 psi | 57% | 2142 fps | 95.2% |
| Lovex S070 | <<locked>> | 90% | 40,828 psi | 65% | 2257 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 42,569 psi | 68% | 2247 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 42,670 psi | 68% | 2251 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,450 psi | 62% | 2224 fps | 98.7% |
| Norma 204 | <<locked>> | 98% | 50,589 psi | 81% | 2444 fps | 95.6% |
| Norma URP | <<locked>> | 84% | 31,821 psi | 51% | 2133 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 80% | 37,840 psi | 61% | 2234 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 37,782 psi | 61% | 2260 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 45,121 psi | 72% | 2300 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,686 psi | 72% | 2320 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,849 psi | 78% | 2336 fps | 99.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,803 psi | 43% | 1332 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,734 psi | 81% | 2359 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,856 psi | 64% | 2221 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,944 psi | 66% | 2323 fps | 98.7% |
| ReloadSwiss RS 60 | 49.9 gr | 80% | 33,286 psi | 53% | 2211 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 33,243 psi | 53% | 2192 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 35,969 psi | 58% | 2247 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 46,412 psi | 74% | 2277 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,480 psi | 65% | 2205 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 33,837 psi | 54% | 2136 fps | 98.2% |
| Rottweil R 907 | <<locked>> | 90% | 44,701 psi | 72% | 2293 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 84% | 35,824 psi | 57% | 2142 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 42,395 psi | 68% | 2274 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,595 psi | 62% | 2192 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 90% | 40,828 psi | 65% | 2257 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,824 psi | 56% | 2182 fps | 97.7% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,511 psi | 70% | 2280 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,901 psi | 67% | 2264 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,918 psi | 70% | 2201 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,448 psi | 58% | 2090 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 39,871 psi | 64% | 2185 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 48,849 psi | 78% | 2362 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,555 psi | 70% | 2208 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 43,062 psi | 69% | 2274 fps | 99.3% |
| Somchem S355 | <<locked>> | 80% | 34,809 psi | 56% | 2142 fps | 98.2% |
| Somchem S365 | <<locked>> | 80% | 25,106 psi | 40% | 1998 fps | 95.8% |
| Vihtavuori N130 | <<locked>> | 80% | 49,588 psi | 80% | 2251 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 44,208 psi | 71% | 2195 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,798 psi | 64% | 2188 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,480 psi | 65% | 2198 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,996 psi | 53% | 2087 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 84% | 33,373 psi | 54% | 2136 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 45,382 psi | 73% | 2290 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 38,783 psi | 62% | 2188 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 32,764 psi | 53% | 2139 fps | 95.4% |
| Vihtavuori N555 | <<locked>> | 90% | 29,254 psi | 47% | 2126 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,254 psi | 47% | 2024 fps | 96.3% |
| Winchester 748 | <<locked>> | 80% | 44,817 psi | 72% | 2329 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 41,307 psi | 66% | 2320 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 94% | 27,543 psi | 44% | 2123 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 41,176 psi | 66% | 2267 fps | 99.4% |
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 101 powders for 8.5 x 55 Blaser loaded with the .338 | 250gr | Swift A-Frame. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,575 fps; across all powders the maximum-charge window runs from 1,457 fps to 2,575 fps. Accurate 4350 gives the best case fill at 100 %, and 101 of the 101 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 1:15.5 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. ReloadSwiss RS 60, Alliant Reloder-17, Alliant Power Pro 2000-MR rank at the top here: for 8.5 x 55 Blaser with the .338 | 250gr | 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.