Load Specifications
Bullet Manufacturer:Woodleigh
Bullet Weight:250 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:8.5 x 63 load data
Case Length (l3):2.48"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:75.5 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 63 with .338 | 250gr | Woodleigh PP SN 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, Alliant Reloder-17 and ReloadSwiss RS 60.
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% | 56,057 psi | 90% | 2352 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,534 psi | 87% | 2382 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 54,215 psi | 87% | 2375 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 54,621 psi | 88% | 2428 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 54,926 psi | 88% | 2388 fps | 97.2% |
| Accurate 4064 | <<locked>> | 92% | 54,186 psi | 87% | 2418 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 53,388 psi | 86% | 2493 fps | 99.7% |
| ADI AR 2206H | <<locked>> | 88% | 55,071 psi | 88% | 2456 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 55,912 psi | 90% | 2454 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 54,186 psi | 87% | 2405 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,897 psi | 88% | 2387 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 56,260 psi | 90% | 2497 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 54,578 psi | 88% | 2565 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,898 psi | 90% | 2475 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,738 psi | 89% | 2360 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 53,098 psi | 85% | 2451 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 52,924 psi | 85% | 2505 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 98% | 56,173 psi | 90% | 2583 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,478 psi | 60% | 2280 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,611 psi | 65% | 2411 fps | 97.7% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,839 psi | 88% | 2475 fps | 99.8% |
| Bofors RP3 | <<locked>> | 92% | 52,895 psi | 85% | 2447 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 53,229 psi | 85% | 2419 fps | 97.4% |
| Hodgdon Benchmark | <<locked>> | 86% | 56,217 psi | 90% | 2397 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 53,113 psi | 85% | 2431 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 55,143 psi | 88% | 2520 fps | 100% |
| Hodgdon H322 | <<locked>> | 84% | 54,259 psi | 87% | 2394 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 54,041 psi | 87% | 2459 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 96% | 54,650 psi | 88% | 2523 fps | 98.3% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 55,347 psi | 89% | 2477 fps | 97% |
| Hodgdon H4895 | <<locked>> | 88% | 55,579 psi | 89% | 2464 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,313 psi | 79% | 2398 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 54,824 psi | 88% | 2490 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,693 psi | 86% | 2533 fps | 97.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,332 psi | 58% | 1453 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 55,637 psi | 89% | 2444 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 53,780 psi | 86% | 2424 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 54,737 psi | 88% | 2421 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 94% | 54,317 psi | 87% | 2406 fps | 98% |
| IMR 4198 | <<locked>> | 82% | 56,014 psi | 90% | 2322 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 53,171 psi | 85% | 2431 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 96% | 55,259 psi | 89% | 2441 fps | 98% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,093 psi | 74% | 2369 fps | 98.9% |
| IMR 4895 | <<locked>> | 90% | 54,433 psi | 87% | 2477 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 54,186 psi | 87% | 2412 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 54,360 psi | 87% | 2400 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,621 psi | 88% | 2434 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,882 psi | 88% | 2391 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 55,245 psi | 89% | 2435 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,854 psi | 90% | 2441 fps | 99% |
| Lovex S070ᴾ | <<locked>> | 100% | 55,782 psi | 89% | 2472 fps | 98.4% |
| Norma 201 | <<locked>> | 88% | 53,940 psi | 86% | 2408 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,433 psi | 87% | 2410 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,666 psi | 89% | 2484 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 54,839 psi | 88% | 2482 fps | 96.2% |
| Norma URPᴾ | <<locked>> | 100% | 53,766 psi | 86% | 2492 fps | 99.6% |
| Ramshot Big Game | <<locked>> | 92% | 56,072 psi | 90% | 2508 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 52,040 psi | 83% | 2488 fps | 98.5% |
| Ramshot TAC | <<locked>> | 86% | 54,447 psi | 87% | 2433 fps | 99.2% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,896 psi | 86% | 2448 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 55,187 psi | 88% | 2416 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,100 psi | 58% | 1488 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,722 psi | 86% | 2393 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 54,462 psi | 87% | 2444 fps | 98.6% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 53,214 psi | 85% | 2506 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 56,159 psi | 90% | 2583 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 53,127 psi | 85% | 2521 fps | 99.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 53,040 psi | 85% | 2544 fps | 99.4% |
| Rottweil R 901 | <<locked>> | 86% | 55,071 psi | 88% | 2389 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 54,389 psi | 87% | 2406 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 56,014 psi | 90% | 2478 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 53,229 psi | 85% | 2419 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,854 psi | 90% | 2441 fps | 99% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,621 psi | 88% | 2434 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 55,245 psi | 89% | 2435 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 55,129 psi | 88% | 2464 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 54,375 psi | 87% | 2493 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,420 psi | 90% | 2460 fps | 99.6% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,432 psi | 86% | 2432 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,709 psi | 89% | 2352 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,405 psi | 89% | 2349 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,520 psi | 87% | 2397 fps | 98% |
| Somchem S321 | <<locked>> | 84% | 55,288 psi | 89% | 2443 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,897 psi | 88% | 2352 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,999 psi | 90% | 2452 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 56,434 psi | 90% | 2477 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,037 psi | 77% | 2449 fps | 100% |
| Unknown powder | <<locked>> | 98% | 53,882 psi | 86% | 2497 fps | 99.4% |
| Vihtavuori N130 | <<locked>> | 84% | 54,317 psi | 87% | 2305 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,114 psi | 88% | 2332 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 53,925 psi | 86% | 2365 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,114 psi | 87% | 2383 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 54,897 psi | 88% | 2418 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 54,476 psi | 87% | 2473 fps | 99.7% |
| Vihtavuori N530 | <<locked>> | 84% | 53,896 psi | 86% | 2416 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 53,693 psi | 86% | 2408 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 55,999 psi | 90% | 2517 fps | 99.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,972 psi | 64% | 2342 fps | 98.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 56,014 psi | 90% | 2473 fps | 100% |
| Winchester 748 | <<locked>> | 84% | 54,955 psi | 88% | 2462 fps | 100% |
| Winchester 760 | <<locked>> | 96% | 54,650 psi | 88% | 2523 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,083 psi | 53% | 2274 fps | 98.3% |
| Winchester StaBALL Match | <<locked>> | 82% | 54,505 psi | 87% | 2458 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% | 46,673 psi | 75% | 2238 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 51,126 psi | 82% | 2339 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,479 psi | 63% | 2182 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,643 psi | 72% | 2297 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 45,281 psi | 73% | 2251 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 37,333 psi | 60% | 2175 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 31,009 psi | 50% | 2113 fps | 95% |
| ADI AR 2206H | <<locked>> | 80% | 43,004 psi | 69% | 2279 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 80% | 36,593 psi | 59% | 2152 fps | 97.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 45,078 psi | 72% | 2277 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 45,223 psi | 73% | 2270 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,649 psi | 84% | 2451 fps | 100% |
| Alliant Power Pro 2000-MR | 50.3 gr | 80% | 38,928 psi | 62% | 2306 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,042 psi | 58% | 2170 fps | 98.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,504 psi | 84% | 2322 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,798 psi | 62% | 2224 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 31,894 psi | 51% | 2135 fps | 95.3% |
| Alliant Reloder-17 | 49.5 gr | 80% | 31,053 psi | 50% | 2144 fps | 96.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,993 psi | 46% | 2097 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,447 psi | 57% | 2302 fps | 95.9% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 42,018 psi | 67% | 2283 fps | 98.4% |
| Bofors RP3 | <<locked>> | 80% | 35,578 psi | 57% | 2174 fps | 98.8% |
| Bofors RP7 | <<locked>> | 90% | 44,222 psi | 71% | 2282 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,949 psi | 75% | 2273 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,642 psi | 70% | 2300 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 48,138 psi | 77% | 2421 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 80% | 47,848 psi | 77% | 2312 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,434 psi | 58% | 2176 fps | 96.4% |
| Hodgdon H414 | <<locked>> | 88% | 41,742 psi | 67% | 2324 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 94% | 46,282 psi | 74% | 2343 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 43,381 psi | 70% | 2288 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 27,369 psi | 44% | 2003 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,941 psi | 59% | 2215 fps | 99% |
| Hodgdon Superformance | <<locked>> | 92% | 43,584 psi | 70% | 2374 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,339 psi | 42% | 1295 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,711 psi | 62% | 2188 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 39,334 psi | 63% | 2225 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,940 psi | 58% | 2123 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 84% | 40,582 psi | 65% | 2191 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 52,750 psi | 85% | 2284 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 44,266 psi | 71% | 2300 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 88% | 43,352 psi | 70% | 2260 fps | 95.6% |
| IMR 4831 | <<locked>> | 88% | 30,980 psi | 50% | 2105 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 39,711 psi | 64% | 2251 fps | 98.9% |
| IMR 8208 XBR | <<locked>> | 80% | 45,078 psi | 72% | 2285 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 50,720 psi | 81% | 2354 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,829 psi | 67% | 2260 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,207 psi | 69% | 2223 fps | 99.3% |
| Lovex S062 | <<locked>> | 80% | 38,276 psi | 61% | 2183 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 35,592 psi | 57% | 2135 fps | 95% |
| Lovex S070 | <<locked>> | 90% | 40,379 psi | 65% | 2246 fps | 95.3% |
| Norma 201 | <<locked>> | 80% | 42,250 psi | 68% | 2239 fps | 99.8% |
| Norma 202 | <<locked>> | 80% | 42,337 psi | 68% | 2243 fps | 100% |
| Norma 203B | <<locked>> | 80% | 38,159 psi | 61% | 2215 fps | 98.5% |
| Norma 204 | <<locked>> | 98% | 50,212 psi | 81% | 2433 fps | 95.4% |
| Norma URP | <<locked>> | 84% | 31,560 psi | 51% | 2122 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 80% | 37,579 psi | 60% | 2227 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 37,362 psi | 60% | 2249 fps | 95.1% |
| Ramshot TAC | <<locked>> | 80% | 44,889 psi | 72% | 2292 fps | 97.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 44,193 psi | 71% | 2307 fps | 99.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,588 psi | 78% | 2328 fps | 99.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,643 psi | 43% | 1326 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,430 psi | 81% | 2351 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,407 psi | 63% | 2208 fps | 95.5% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,350 psi | 65% | 2309 fps | 98.6% |
| ReloadSwiss RS 60 | 49.5 gr | 80% | 33,040 psi | 53% | 2201 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 33,011 psi | 53% | 2184 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 35,621 psi | 57% | 2237 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 46,021 psi | 74% | 2268 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,147 psi | 64% | 2196 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 80% | 33,533 psi | 54% | 2128 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 90% | 44,222 psi | 71% | 2282 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 35,592 psi | 57% | 2135 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,829 psi | 67% | 2260 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,276 psi | 61% | 2183 fps | 99.4% |
| Shooters World SW4350 | <<locked>> | 90% | 40,379 psi | 65% | 2238 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,360 psi | 55% | 2169 fps | 97.5% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 43,004 psi | 69% | 2268 fps | 97.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,394 psi | 66% | 2252 fps | 99% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,555 psi | 70% | 2193 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,114 psi | 58% | 2083 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 42,105 psi | 68% | 2220 fps | 95.6% |
| Somchem S321 | <<locked>> | 80% | 48,544 psi | 78% | 2354 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 43,250 psi | 69% | 2199 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,801 psi | 69% | 2267 fps | 99.2% |
| Somchem S355 | <<locked>> | 80% | 34,505 psi | 55% | 2134 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 24,903 psi | 40% | 1987 fps | 95.6% |
| Unknown powder | <<locked>> | 84% | 34,519 psi | 55% | 2174 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 48,327 psi | 77% | 2232 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,176 psi | 66% | 2150 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,465 psi | 63% | 2172 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,668 psi | 64% | 2183 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 29,341 psi | 47% | 2009 fps | 97.8% |
| Vihtavuori N160 | <<locked>> | 82% | 32,271 psi | 52% | 2106 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 47,529 psi | 76% | 2330 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 39,160 psi | 63% | 2200 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 32,518 psi | 52% | 2142 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 92% | 30,806 psi | 49% | 2160 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,051 psi | 47% | 2016 fps | 96.1% |
| Winchester 748 | <<locked>> | 80% | 48,008 psi | 77% | 2372 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 41,742 psi | 67% | 2324 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,008 psi | 47% | 2166 fps | 96.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 50,894 psi | 82% | 2410 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 103 powders for 8.5 x 63 loaded with the .338 | 250gr | Woodleigh PP SN. Alliant Reloder-17 delivers the highest muzzle velocity at 2,583 fps; across all powders the maximum-charge window runs from 1,453 fps to 2,583 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 1:16.5 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. Alliant Power Pro 2000-MR, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for 8.5 x 63 with the .338 | 250gr | Woodleigh PP SN 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.