Load Specifications
Bullet Manufacturer:Lapua
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:1:13.5
Load data in caliber 8.5 x 63 with .338 | 250gr | Lapua Lock Base bullet and 105 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 Power Pro 2000-MR and ReloadSwiss RS 52.
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% | 53,954 psi | 87% | 2313 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,825 psi | 90% | 2382 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 55,187 psi | 88% | 2375 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 53,983 psi | 87% | 2395 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,274 psi | 89% | 2379 fps | 97% |
| Accurate 4064 | <<locked>> | 94% | 54,969 psi | 88% | 2415 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 50,647 psi | 81% | 2441 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 90% | 56,246 psi | 90% | 2444 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 53,809 psi | 86% | 2402 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 88% | 55,550 psi | 89% | 2405 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 55,999 psi | 90% | 2379 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 53,882 psi | 86% | 2451 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 55,579 psi | 89% | 2549 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 53,359 psi | 86% | 2421 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 53,925 psi | 86% | 2316 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 53,998 psi | 87% | 2438 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,487 psi | 79% | 2444 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 98% | 53,505 psi | 86% | 2523 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,983 psi | 56% | 2215 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 38,522 psi | 62% | 2339 fps | 96.4% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 55,564 psi | 89% | 2303 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 56,057 psi | 90% | 2464 fps | 99.8% |
| Bofors RP3 | <<locked>> | 94% | 53,548 psi | 86% | 2431 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 54,273 psi | 87% | 2405 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 86% | 54,157 psi | 87% | 2346 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 54,346 psi | 87% | 2431 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 56,362 psi | 90% | 2516 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 84% | 56,391 psi | 90% | 2395 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 53,766 psi | 86% | 2382 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 54,926 psi | 88% | 2444 fps | 99.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 53,693 psi | 86% | 2484 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 98% | 55,013 psi | 88% | 2451 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 88% | 53,490 psi | 86% | 2411 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,542 psi | 73% | 2339 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,550 psi | 89% | 2480 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 55,027 psi | 88% | 2520 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,099 psi | 56% | 1427 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 54,578 psi | 88% | 2411 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 53,055 psi | 85% | 2395 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 53,359 psi | 86% | 2385 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 90% | 53,751 psi | 86% | 2369 fps | 97.6% |
| IMR 4198 | <<locked>> | 82% | 54,056 psi | 87% | 2277 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 50,676 psi | 81% | 2379 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 98% | 56,420 psi | 90% | 2434 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,051 psi | 77% | 2388 fps | 99.1% |
| IMR 4895 | <<locked>> | 92% | 55,332 psi | 89% | 2464 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 55,550 psi | 89% | 2405 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 55,811 psi | 89% | 2395 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 55,854 psi | 90% | 2428 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 56,130 psi | 90% | 2382 fps | 100% |
| Lovex S062 | <<locked>> | 94% | 56,231 psi | 90% | 2421 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 55,100 psi | 88% | 2425 fps | 98.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,446 psi | 84% | 2408 fps | 97.6% |
| Norma 201 | <<locked>> | 90% | 55,042 psi | 88% | 2398 fps | 100% |
| Norma 202 | <<locked>> | 90% | 55,564 psi | 89% | 2398 fps | 100% |
| Norma 203B | <<locked>> | 92% | 53,142 psi | 85% | 2425 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 49,864 psi | 80% | 2428 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 92% | 53,432 psi | 86% | 2451 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 49,081 psi | 79% | 2425 fps | 97.7% |
| Ramshot TAC | <<locked>> | 88% | 55,941 psi | 90% | 2425 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 88% | 55,230 psi | 89% | 2441 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 53,069 psi | 85% | 2365 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,592 psi | 57% | 1463 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,013 psi | 88% | 2385 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 55,492 psi | 89% | 2428 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 54,317 psi | 87% | 2497 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 53,345 psi | 86% | 2523 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 49,864 psi | 80% | 2457 fps | 99.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,502 psi | 81% | 2477 fps | 98.8% |
| Rottweil R 901 | <<locked>> | 88% | 56,188 psi | 90% | 2379 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 55,506 psi | 89% | 2395 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 53,417 psi | 86% | 2425 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 54,273 psi | 87% | 2405 fps | 97.1% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 55,100 psi | 88% | 2425 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 90% | 55,854 psi | 90% | 2428 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 56,231 psi | 90% | 2421 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,446 psi | 84% | 2408 fps | 97.6% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 54,795 psi | 88% | 2362 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 55,317 psi | 89% | 2480 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 54,839 psi | 88% | 2336 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 54,041 psi | 87% | 2402 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 54,694 psi | 88% | 2425 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 53,751 psi | 86% | 2306 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 53,476 psi | 86% | 2303 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,927 psi | 90% | 2388 fps | 97.8% |
| Somchem S321 | <<locked>> | 84% | 53,055 psi | 85% | 2392 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 56,043 psi | 90% | 2343 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 53,664 psi | 86% | 2398 fps | 99.9% |
| Somchem S355 | <<locked>> | 96% | 53,969 psi | 87% | 2421 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,498 psi | 71% | 2385 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 53,490 psi | 86% | 2270 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 53,853 psi | 86% | 2293 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 54,810 psi | 88% | 2362 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 56,057 psi | 90% | 2382 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,448 psi | 89% | 2405 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,794 psi | 85% | 2428 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 88% | 55,970 psi | 90% | 2402 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 54,143 psi | 87% | 2382 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,663 psi | 83% | 2434 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,376 psi | 60% | 2280 fps | 97.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,214 psi | 85% | 2411 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 55,579 psi | 89% | 2448 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 54,027 psi | 87% | 2487 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 31,227 psi | 50% | 2198 fps | 96.8% |
| Winchester StaBALL Match | <<locked>> | 90% | 54,447 psi | 87% | 2431 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% | 45,020 psi | 72% | 2201 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,878 psi | 78% | 2297 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,579 psi | 60% | 2139 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,976 psi | 71% | 2264 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 48,457 psi | 78% | 2283 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 35,534 psi | 57% | 2133 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 33,533 psi | 54% | 2156 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 41,365 psi | 66% | 2228 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 35,114 psi | 56% | 2100 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,439 psi | 70% | 2234 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 43,062 psi | 69% | 2224 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,604 psi | 81% | 2405 fps | 100% |
| Alliant Power Pro 2000-MR | 48.1 gr | 80% | 37,217 psi | 60% | 2244 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,461 psi | 55% | 2119 fps | 98.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,662 psi | 81% | 2277 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,217 psi | 60% | 2172 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 88% | 34,476 psi | 55% | 2169 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,762 psi | 48% | 2087 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 29,341 psi | 47% | 2080 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 98% | 36,027 psi | 58% | 2283 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 52,228 psi | 84% | 2264 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,176 psi | 64% | 2228 fps | 97.7% |
| Bofors RP3 | <<locked>> | 80% | 33,968 psi | 54% | 2123 fps | 98.1% |
| Bofors RP7 | <<locked>> | 92% | 45,208 psi | 72% | 2270 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,339 psi | 73% | 2228 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,640 psi | 67% | 2251 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 45,687 psi | 73% | 2369 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 80% | 49,458 psi | 79% | 2313 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 50,328 psi | 81% | 2339 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 34,795 psi | 56% | 2119 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 92% | 41,495 psi | 67% | 2293 fps | 95% |
| Hodgdon H4350 | <<locked>> | 94% | 48,472 psi | 78% | 2359 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 41,742 psi | 67% | 2238 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 27,862 psi | 45% | 1991 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,492 psi | 60% | 2211 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 96% | 47,790 psi | 77% | 2411 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,136 psi | 42% | 1273 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,001 psi | 64% | 2195 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 40,886 psi | 66% | 2231 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,840 psi | 59% | 2126 fps | 97.4% |
| IMR 4166 Enduron | <<locked>> | 84% | 44,715 psi | 72% | 2234 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 51,053 psi | 82% | 2241 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 44,933 psi | 72% | 2290 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 90% | 44,266 psi | 71% | 2257 fps | 95.5% |
| IMR 4831 | <<locked>> | 88% | 32,721 psi | 52% | 2123 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 38,101 psi | 61% | 2198 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 43,439 psi | 70% | 2234 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 48,544 psi | 78% | 2303 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 39,900 psi | 64% | 2208 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 41,640 psi | 67% | 2172 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 36,651 psi | 59% | 2133 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 38,464 psi | 62% | 2169 fps | 95.5% |
| Lovex S070 | <<locked>> | 92% | 41,162 psi | 66% | 2234 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 40,553 psi | 65% | 2188 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 40,611 psi | 65% | 2195 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,608 psi | 59% | 2162 fps | 97.9% |
| Norma URP | <<locked>> | 88% | 34,113 psi | 55% | 2156 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 35,839 psi | 57% | 2172 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 94% | 40,553 psi | 65% | 2283 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 43,163 psi | 69% | 2238 fps | 97% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,525 psi | 68% | 2257 fps | 99% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,717 psi | 75% | 2274 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,440 psi | 42% | 1306 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,428 psi | 78% | 2300 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 40,263 psi | 65% | 2198 fps | 95.2% |
| ReloadSwiss RS 52 | 46.6 gr | 80% | 38,392 psi | 62% | 2251 fps | 97.8% |
| ReloadSwiss RS 60 | 47.4 gr | 80% | 31,691 psi | 51% | 2142 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 33,533 psi | 54% | 2172 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 38,769 psi | 62% | 2274 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 44,425 psi | 71% | 2221 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,508 psi | 62% | 2146 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 31,995 psi | 51% | 2073 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 92% | 45,208 psi | 72% | 2270 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 38,464 psi | 62% | 2169 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,900 psi | 64% | 2208 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 36,651 psi | 59% | 2133 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 41,162 psi | 66% | 2234 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,242 psi | 82% | 2320 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,851 psi | 53% | 2113 fps | 96.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,474 psi | 83% | 2293 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,118 psi | 66% | 2211 fps | 97.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,711 psi | 64% | 2198 fps | 98.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,032 psi | 67% | 2149 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,780 psi | 56% | 2041 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 42,815 psi | 69% | 2205 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 46,543 psi | 75% | 2300 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 41,611 psi | 67% | 2152 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,944 psi | 66% | 2215 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 32,967 psi | 53% | 2080 fps | 97.3% |
| Somchem S365 | <<locked>> | 82% | 25,280 psi | 41% | 1975 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 47,587 psi | 76% | 2198 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,250 psi | 68% | 2146 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,753 psi | 61% | 2133 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,537 psi | 62% | 2142 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,285 psi | 50% | 2028 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 33,518 psi | 54% | 2113 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 43,410 psi | 70% | 2231 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 36,840 psi | 59% | 2133 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 35,143 psi | 56% | 2165 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 94% | 31,009 psi | 50% | 2142 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 29,704 psi | 48% | 2008 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 42,583 psi | 68% | 2270 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 41,495 psi | 67% | 2293 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 98% | 29,298 psi | 47% | 2142 fps | 95.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,015 psi | 63% | 2205 fps | 98.8% |
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 105 powders for 8.5 x 63 loaded with the .338 | 250gr | Lapua Lock Base. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,549 fps; across all powders the maximum-charge window runs from 1,427 fps to 2,549 fps. Accurate 4350 gives the best case fill at 100 %, and 105 of the 105 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 50–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:13.5 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 Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for 8.5 x 63 with the .338 | 250gr | Lapua Lock Base 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.