Load Specifications
Bullet:.338 | 250gr | Lapua Scenar
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:1:12.5
Load data in caliber 8.5 x 63 with .338 | 250gr | Lapua Scenar bullet and 107 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, ReloadSwiss RS 60 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>> | 88% | 55,448 psi | 89% | 2316 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 53,853 psi | 86% | 2346 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 52,997 psi | 85% | 2336 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 55,463 psi | 89% | 2398 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 53,534 psi | 86% | 2336 fps | 96.4% |
| Accurate 4064 | <<locked>> | 96% | 56,101 psi | 90% | 2415 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 48,312 psi | 77% | 2395 fps | 98.9% |
| Accurate LT-30 | <<locked>> | 82% | 55,013 psi | 88% | 2267 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,434 psi | 89% | 2290 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 54,433 psi | 87% | 2408 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 96% | 55,143 psi | 88% | 2402 fps | 99.7% |
| ADI AR 2219 | <<locked>> | 82% | 55,811 psi | 89% | 2375 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 53,679 psi | 86% | 2365 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 53,940 psi | 86% | 2346 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,317 psi | 89% | 2454 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 53,751 psi | 86% | 2507 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 54,563 psi | 87% | 2421 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,608 psi | 89% | 2323 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,564 psi | 89% | 2441 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,558 psi | 76% | 2395 fps | 99% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 54,955 psi | 88% | 2526 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,765 psi | 54% | 2172 fps | 97% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,157 psi | 87% | 2274 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 53,853 psi | 86% | 2421 fps | 99.5% |
| Bofors RP3 | <<locked>> | 96% | 54,940 psi | 88% | 2434 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 55,927 psi | 90% | 2408 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 88% | 55,883 psi | 90% | 2352 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 55,999 psi | 90% | 2438 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 54,404 psi | 87% | 2477 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 84% | 54,520 psi | 87% | 2359 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,521 psi | 89% | 2388 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 52,997 psi | 85% | 2402 fps | 99% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 51,677 psi | 83% | 2438 fps | 97.2% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 56,420 psi | 90% | 2451 fps | 96.6% |
| Hodgdon H4895 | <<locked>> | 90% | 54,897 psi | 88% | 2415 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,830 psi | 70% | 2297 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 53,476 psi | 86% | 2441 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 52,881 psi | 85% | 2470 fps | 96.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,867 psi | 56% | 1411 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,217 psi | 90% | 2415 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 54,549 psi | 87% | 2398 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 54,868 psi | 88% | 2388 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,492 psi | 89% | 2372 fps | 97.6% |
| IMR 4198 | <<locked>> | 84% | 55,680 psi | 89% | 2280 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 49,081 psi | 79% | 2339 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 98% | 54,360 psi | 87% | 2388 fps | 97.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 45,919 psi | 74% | 2343 fps | 98.6% |
| IMR 4895 | <<locked>> | 92% | 53,490 psi | 86% | 2425 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 53,679 psi | 86% | 2365 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 53,882 psi | 86% | 2356 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 53,592 psi | 86% | 2385 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 54,636 psi | 88% | 2346 fps | 99.9% |
| Lovex S062 | <<locked>> | 94% | 54,346 psi | 87% | 2385 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 53,316 psi | 85% | 2382 fps | 98.4% |
| Lovex S070ᴾ | <<locked>> | 100% | 50,705 psi | 81% | 2369 fps | 97% |
| Norma 201 | <<locked>> | 90% | 53,113 psi | 85% | 2359 fps | 100% |
| Norma 202 | <<locked>> | 90% | 53,548 psi | 86% | 2362 fps | 100% |
| Norma 203B | <<locked>> | 94% | 54,708 psi | 88% | 2431 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 48,095 psi | 77% | 2388 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 94% | 54,882 psi | 88% | 2454 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 47,123 psi | 76% | 2379 fps | 97% |
| Ramshot TAC | <<locked>> | 88% | 54,128 psi | 87% | 2385 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 88% | 53,229 psi | 85% | 2398 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 86% | 54,897 psi | 88% | 2372 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,360 psi | 57% | 1447 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 53,330 psi | 86% | 2349 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 53,476 psi | 86% | 2385 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,550 psi | 89% | 2497 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 55,042 psi | 88% | 2530 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 47,848 psi | 77% | 2415 fps | 98.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 48,704 psi | 78% | 2431 fps | 98.2% |
| Rottweil R 901 | <<locked>> | 88% | 54,375 psi | 87% | 2343 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 53,592 psi | 86% | 2356 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 54,795 psi | 88% | 2425 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 55,927 psi | 90% | 2408 fps | 97.1% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 53,316 psi | 85% | 2382 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 90% | 53,592 psi | 86% | 2385 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 54,346 psi | 87% | 2385 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 50,705 psi | 81% | 2369 fps | 97% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 53,214 psi | 85% | 2326 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 56,057 psi | 90% | 2388 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 53,156 psi | 85% | 2438 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 53,040 psi | 85% | 2300 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 55,811 psi | 89% | 2408 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 56,101 psi | 90% | 2425 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,158 psi | 88% | 2306 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 54,795 psi | 88% | 2306 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 53,867 psi | 86% | 2343 fps | 97.2% |
| Somchem S321 | <<locked>> | 86% | 54,853 psi | 88% | 2398 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,201 psi | 87% | 2306 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,085 psi | 88% | 2398 fps | 99.9% |
| Somchem S355 | <<locked>> | 98% | 55,317 psi | 89% | 2425 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,859 psi | 69% | 2346 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 86% | 55,259 psi | 89% | 2277 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,158 psi | 88% | 2293 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 56,217 psi | 90% | 2362 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 54,172 psi | 87% | 2346 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 53,476 psi | 86% | 2365 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,662 psi | 81% | 2385 fps | 99% |
| Vihtavuori N530 | <<locked>> | 88% | 54,099 psi | 87% | 2365 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 55,521 psi | 89% | 2385 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,342 psi | 79% | 2388 fps | 98.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,810 psi | 57% | 2234 fps | 96.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 51,430 psi | 82% | 2372 fps | 99.9% |
| Winchester 748 | <<locked>> | 88% | 53,635 psi | 86% | 2408 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 51,677 psi | 83% | 2438 fps | 97.2% |
| Winchester StaBALL Match | <<locked>> | 92% | 55,811 psi | 89% | 2434 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% | 43,627 psi | 70% | 2169 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,137 psi | 76% | 2257 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,013 psi | 58% | 2103 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,337 psi | 68% | 2224 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 49,980 psi | 80% | 2287 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 34,055 psi | 55% | 2093 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 34,171 psi | 55% | 2159 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 51,924 psi | 83% | 2231 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,330 psi | 84% | 2254 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,001 psi | 64% | 2188 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 80% | 34,069 psi | 55% | 2064 fps | 96% |
| ADI AR 2219 | <<locked>> | 80% | 52,272 psi | 84% | 2333 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,047 psi | 67% | 2198 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 41,263 psi | 66% | 2188 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,849 psi | 78% | 2365 fps | 99.8% |
| Alliant Power Pro 2000-MR | 46.4 gr | 80% | 35,926 psi | 58% | 2201 fps | 96.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,344 psi | 53% | 2083 fps | 97.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,139 psi | 79% | 2247 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,882 psi | 58% | 2133 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 33,344 psi | 53% | 2126 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 82% | 30,501 psi | 49% | 2090 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 29,907 psi | 48% | 2080 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,821 psi | 81% | 2234 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,812 psi | 62% | 2188 fps | 97.1% |
| Bofors RP3 | <<locked>> | 80% | 32,474 psi | 52% | 2080 fps | 97.5% |
| Bofors RP7 | <<locked>> | 94% | 46,282 psi | 74% | 2270 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,961 psi | 70% | 2192 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,103 psi | 64% | 2215 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,048 psi | 71% | 2329 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 80% | 47,819 psi | 77% | 2277 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,443 psi | 78% | 2300 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 35,824 psi | 57% | 2126 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 96% | 45,252 psi | 73% | 2343 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 96% | 49,748 psi | 80% | 2359 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 40,335 psi | 65% | 2201 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 30,356 psi | 49% | 2041 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,027 psi | 58% | 2169 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 98% | 49,356 psi | 79% | 2418 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,078 psi | 42% | 1260 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,667 psi | 62% | 2159 fps | 98.5% |
| IMR 3031 | <<locked>> | 80% | 39,436 psi | 63% | 2198 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,723 psi | 57% | 2090 fps | 96.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 43,352 psi | 70% | 2195 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 49,777 psi | 80% | 2215 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 46,108 psi | 74% | 2293 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 45,469 psi | 73% | 2260 fps | 95.4% |
| IMR 4831 | <<locked>> | 90% | 33,359 psi | 53% | 2123 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 36,724 psi | 59% | 2159 fps | 97.7% |
| IMR 8208 XBR | <<locked>> | 80% | 42,047 psi | 67% | 2198 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 46,905 psi | 75% | 2267 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 38,450 psi | 62% | 2172 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 40,582 psi | 65% | 2139 fps | 98.5% |
| Lovex S062 | <<locked>> | 80% | 35,491 psi | 57% | 2096 fps | 98.5% |
| Lovex S065 | <<locked>> | 90% | 39,291 psi | 63% | 2169 fps | 95.5% |
| Lovex S070 | <<locked>> | 94% | 41,989 psi | 67% | 2234 fps | 95% |
| Norma 201 | <<locked>> | 80% | 39,160 psi | 63% | 2149 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 39,378 psi | 63% | 2162 fps | 100% |
| Norma 203B | <<locked>> | 80% | 35,288 psi | 57% | 2123 fps | 97.3% |
| Norma URP | <<locked>> | 90% | 35,041 psi | 56% | 2162 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 34,534 psi | 55% | 2129 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 96% | 41,611 psi | 67% | 2287 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 41,800 psi | 67% | 2198 fps | 96.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,843 psi | 65% | 2215 fps | 98.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,295 psi | 73% | 2238 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,368 psi | 42% | 1293 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,021 psi | 75% | 2267 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 41,452 psi | 66% | 2205 fps | 95.2% |
| ReloadSwiss RS 52 | 45 gr | 80% | 37,014 psi | 59% | 2211 fps | 97.2% |
| ReloadSwiss RS 60 | 45.7 gr | 80% | 30,545 psi | 49% | 2100 fps | 98.3% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 34,330 psi | 55% | 2175 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 37,478 psi | 60% | 2231 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 43,062 psi | 69% | 2188 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 37,304 psi | 60% | 2110 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 30,661 psi | 49% | 2034 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 94% | 46,282 psi | 74% | 2270 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 39,291 psi | 63% | 2169 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,450 psi | 62% | 2172 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 35,491 psi | 57% | 2096 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 94% | 41,989 psi | 67% | 2234 fps | 95% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,647 psi | 80% | 2280 fps | 99.9% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,417 psi | 84% | 2343 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,749 psi | 51% | 2077 fps | 95.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,951 psi | 80% | 2264 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,711 psi | 64% | 2172 fps | 96.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,435 psi | 62% | 2162 fps | 98% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,814 psi | 65% | 2116 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,620 psi | 54% | 2008 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 44,077 psi | 71% | 2211 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 45,005 psi | 72% | 2264 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 40,248 psi | 65% | 2119 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,552 psi | 63% | 2175 fps | 98.2% |
| Somchem S355 | <<locked>> | 80% | 31,720 psi | 51% | 2041 fps | 96.6% |
| Somchem S365 | <<locked>> | 84% | 25,947 psi | 42% | 1982 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 46,195 psi | 74% | 2169 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,973 psi | 66% | 2113 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,376 psi | 58% | 2100 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,159 psi | 60% | 2106 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 30,081 psi | 48% | 1991 fps | 97.5% |
| Vihtavuori N160 | <<locked>> | 88% | 34,447 psi | 55% | 2116 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 41,771 psi | 67% | 2192 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 35,636 psi | 57% | 2096 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 90% | 35,955 psi | 58% | 2165 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 96% | 31,676 psi | 51% | 2146 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 28,805 psi | 46% | 1972 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 40,959 psi | 66% | 2231 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 42,728 psi | 69% | 2300 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,536 psi | 60% | 2162 fps | 98.4% |
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 107 powders for 8.5 x 63 loaded with the .338 | 250gr | Lapua Scenar. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,530 fps; across all powders the maximum-charge window runs from 1,411 fps to 2,530 fps. Accurate 4350 gives the best case fill at 100 %, and 107 of the 107 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder-16, Alliant Reloder-17 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, ReloadSwiss RS 60, ReloadSwiss RS 52 rank at the top here: for 8.5 x 63 with the .338 | 250gr | Lapua Scenar 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.