Load Specifications
Bullet Manufacturer:Lapua
Bullet Weight:231 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:1:14.5
Load data in caliber 8.5 x 63 with .338 | 231gr | Lapua Naturalis bullet and 104 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 52 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>> | 88% | 53,824 psi | 86% | 2428 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 55,579 psi | 89% | 2493 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 54,215 psi | 87% | 2480 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 53,447 psi | 86% | 2503 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 55,376 psi | 89% | 2480 fps | 96.2% |
| Accurate 4064 | <<locked>> | 96% | 53,882 psi | 86% | 2520 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 46,108 psi | 74% | 2484 fps | 98.2% |
| Accurate LT-30 | <<locked>> | 82% | 53,795 psi | 86% | 2379 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 54,230 psi | 87% | 2402 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 54,230 psi | 87% | 2402 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 56,231 psi | 90% | 2556 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 96% | 53,838 psi | 86% | 2510 fps | 99.4% |
| ADI AR 2219 | <<locked>> | 82% | 54,346 psi | 87% | 2490 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,448 psi | 89% | 2516 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 55,376 psi | 89% | 2490 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 53,780 psi | 86% | 2566 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 55,825 psi | 90% | 2664 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 56,260 psi | 90% | 2569 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 53,635 psi | 86% | 2431 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 53,693 psi | 86% | 2546 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 46,180 psi | 74% | 2493 fps | 98.3% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 53,301 psi | 85% | 2631 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 56,289 psi | 90% | 2421 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 55,970 psi | 90% | 2572 fps | 99.4% |
| Bofors RP3 | <<locked>> | 96% | 53,113 psi | 85% | 2539 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 53,983 psi | 87% | 2503 fps | 96.3% |
| Hodgdon Benchmark | <<locked>> | 88% | 54,360 psi | 87% | 2461 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 54,215 psi | 87% | 2543 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 52,518 psi | 84% | 2582 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 84% | 52,808 psi | 85% | 2470 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 53,853 psi | 86% | 2497 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 54,737 psi | 88% | 2549 fps | 98.9% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 49,980 psi | 80% | 2536 fps | 96.3% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 54,897 psi | 88% | 2552 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 90% | 53,127 psi | 85% | 2520 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 42,148 psi | 68% | 2388 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 55,608 psi | 89% | 2598 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,534 psi | 55% | 1490 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 54,737 psi | 88% | 2526 fps | 99.9% |
| IMR 3031 | <<locked>> | 92% | 56,130 psi | 90% | 2549 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 53,417 psi | 86% | 2493 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 92% | 53,983 psi | 87% | 2474 fps | 96.8% |
| IMR 4198 | <<locked>> | 84% | 54,476 psi | 87% | 2398 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 56,347 psi | 90% | 2536 fps | 97.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 44,106 psi | 71% | 2434 fps | 97.8% |
| IMR 4895 | <<locked>> | 94% | 55,027 psi | 88% | 2572 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 90% | 55,448 psi | 89% | 2516 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 55,448 psi | 89% | 2503 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 55,216 psi | 89% | 2536 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 56,275 psi | 90% | 2493 fps | 99.9% |
| Lovex S062 | <<locked>> | 96% | 55,956 psi | 90% | 2533 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,692 psi | 83% | 2484 fps | 97.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 48,878 psi | 78% | 2461 fps | 96.2% |
| Norma 201 | <<locked>> | 92% | 54,592 psi | 88% | 2507 fps | 100% |
| Norma 202 | <<locked>> | 92% | 55,201 psi | 89% | 2510 fps | 100% |
| Norma 203B | <<locked>> | 96% | 56,391 psi | 90% | 2582 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 46,369 psi | 74% | 2480 fps | 98.1% |
| Ramshot Big Game | <<locked>> | 94% | 53,359 psi | 86% | 2559 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 45,643 psi | 73% | 2470 fps | 96.1% |
| Ramshot TAC | <<locked>> | 90% | 56,130 psi | 90% | 2533 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 90% | 55,274 psi | 89% | 2552 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 86% | 53,417 psi | 86% | 2477 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,882 psi | 56% | 1526 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 55,317 psi | 89% | 2503 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 55,390 psi | 89% | 2533 fps | 97.7% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 53,737 psi | 86% | 2605 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 53,301 psi | 85% | 2635 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 46,079 psi | 74% | 2507 fps | 97.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 47,253 psi | 76% | 2526 fps | 97.4% |
| Rottweil R 901 | <<locked>> | 90% | 55,477 psi | 89% | 2487 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 55,071 psi | 88% | 2503 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 56,434 psi | 90% | 2575 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 53,983 psi | 87% | 2503 fps | 96.3% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,692 psi | 83% | 2484 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 92% | 55,216 psi | 89% | 2536 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,956 psi | 90% | 2533 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 48,878 psi | 78% | 2461 fps | 96.2% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 55,129 psi | 88% | 2477 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 54,607 psi | 88% | 2500 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 54,955 psi | 88% | 2589 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 54,723 psi | 88% | 2448 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 53,954 psi | 87% | 2510 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 54,534 psi | 87% | 2533 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 53,708 psi | 86% | 2415 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 53,388 psi | 86% | 2415 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 51,938 psi | 83% | 2438 fps | 96.4% |
| Somchem S321 | <<locked>> | 86% | 53,142 psi | 85% | 2503 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 55,869 psi | 90% | 2454 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 53,621 psi | 86% | 2507 fps | 99.7% |
| Somchem S355 | <<locked>> | 98% | 53,461 psi | 86% | 2526 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 41,118 psi | 66% | 2434 fps | 99.6% |
| Vihtavuori N130 | <<locked>> | 86% | 53,577 psi | 86% | 2385 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 53,751 psi | 86% | 2405 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 54,375 psi | 87% | 2474 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 55,970 psi | 90% | 2493 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 55,245 psi | 89% | 2513 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,834 psi | 78% | 2480 fps | 98.4% |
| Vihtavuori N530 | <<locked>> | 90% | 56,217 psi | 90% | 2516 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 53,795 psi | 86% | 2490 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,863 psi | 77% | 2487 fps | 98.1% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,951 psi | 80% | 2474 fps | 99.7% |
| Winchester 748 | <<locked>> | 90% | 55,550 psi | 89% | 2562 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 50,198 psi | 80% | 2539 fps | 96.3% |
| Winchester StaBALL Match | <<locked>> | 92% | 54,331 psi | 87% | 2543 fps | 99.9% |
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% | 41,901 psi | 67% | 2267 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 45,455 psi | 73% | 2359 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 33,924 psi | 54% | 2185 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,669 psi | 65% | 2320 fps | 99.8% |
| Accurate 2700 | <<locked>> | 92% | 51,822 psi | 83% | 2431 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 32,097 psi | 51% | 2172 fps | 99.3% |
| Accurate 4350 | <<locked>> | 92% | 34,737 psi | 56% | 2280 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 50,662 psi | 81% | 2339 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,053 psi | 82% | 2359 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,053 psi | 82% | 2359 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,479 psi | 62% | 2277 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 82% | 34,824 psi | 56% | 2188 fps | 95.7% |
| ADI AR 2219 | <<locked>> | 80% | 50,734 psi | 81% | 2441 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,582 psi | 65% | 2290 fps | 99% |
| Alliant AR-Comp | <<locked>> | 80% | 39,755 psi | 64% | 2290 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 47,094 psi | 76% | 2467 fps | 99.5% |
| Alliant Power Pro 2000-MR | 49.2 gr | 80% | 34,635 psi | 56% | 2283 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,691 psi | 51% | 2159 fps | 96.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,587 psi | 76% | 2352 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,360 psi | 55% | 2215 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 92% | 36,114 psi | 58% | 2300 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 84% | 31,154 psi | 50% | 2211 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,458 psi | 79% | 2339 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,376 psi | 60% | 2277 fps | 96.1% |
| Bofors RP3 | <<locked>> | 80% | 30,879 psi | 50% | 2156 fps | 96.4% |
| Bofors RP7 | <<locked>> | 98% | 50,749 psi | 81% | 2457 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,656 psi | 68% | 2287 fps | 99.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,566 psi | 62% | 2303 fps | 99.1% |
| Hodgdon CFE223 | <<locked>> | 80% | 42,409 psi | 68% | 2421 fps | 98% |
| Hodgdon H322 | <<locked>> | 80% | 46,325 psi | 74% | 2382 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,891 psi | 75% | 2402 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 36,608 psi | 59% | 2254 fps | 95% |
| Hodgdon H414 | <<locked>> | 98% | 46,702 psi | 75% | 2484 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 98% | 51,677 psi | 83% | 2507 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 38,783 psi | 62% | 2290 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 30,705 psi | 49% | 2152 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,534 psi | 55% | 2254 fps | 97.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,759 psi | 41% | 1332 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,333 psi | 60% | 2247 fps | 97.7% |
| IMR 3031 | <<locked>> | 80% | 37,739 psi | 61% | 2287 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,258 psi | 55% | 2172 fps | 95.8% |
| IMR 4166 Enduron | <<locked>> | 88% | 47,688 psi | 76% | 2382 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 48,327 psi | 77% | 2320 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 46,891 psi | 75% | 2398 fps | 95.2% |
| IMR 4831 | <<locked>> | 94% | 36,216 psi | 58% | 2293 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 35,157 psi | 56% | 2241 fps | 96.8% |
| IMR 8208 XBR | <<locked>> | 80% | 40,582 psi | 65% | 2290 fps | 99% |
| Lovex D073.5 | <<locked>> | 80% | 45,078 psi | 72% | 2362 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 36,709 psi | 59% | 2257 fps | 99.4% |
| Lovex S060 | <<locked>> | 80% | 39,160 psi | 63% | 2228 fps | 97.7% |
| Lovex S062 | <<locked>> | 80% | 33,823 psi | 54% | 2175 fps | 97.6% |
| Lovex S065 | <<locked>> | 92% | 40,161 psi | 64% | 2297 fps | 95.1% |
| Lovex S070 | <<locked>> | 98% | 45,745 psi | 73% | 2411 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 37,608 psi | 60% | 2238 fps | 98.5% |
| Norma 202 | <<locked>> | 80% | 37,666 psi | 60% | 2251 fps | 99.8% |
| Norma 203B | <<locked>> | 80% | 33,721 psi | 54% | 2205 fps | 96.2% |
| Norma URP | <<locked>> | 92% | 35,694 psi | 57% | 2287 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 33,156 psi | 53% | 2211 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 98% | 42,757 psi | 69% | 2421 fps | 95.3% |
| Ramshot TAC | <<locked>> | 80% | 40,393 psi | 65% | 2287 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,392 psi | 63% | 2306 fps | 97.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,903 psi | 70% | 2333 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,962 psi | 42% | 1365 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,600 psi | 73% | 2369 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 42,656 psi | 68% | 2339 fps | 95% |
| ReloadSwiss RS 52 | 47.7 gr | 80% | 35,447 psi | 57% | 2297 fps | 96.1% |
| ReloadSwiss RS 60 | 48.4 gr | 80% | 29,153 psi | 47% | 2169 fps | 97.1% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 37,333 psi | 60% | 2349 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 41,162 psi | 66% | 2415 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 41,263 psi | 66% | 2280 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 35,621 psi | 57% | 2192 fps | 98% |
| Rottweil R 903 | <<locked>> | 80% | 29,037 psi | 47% | 2106 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 98% | 50,749 psi | 81% | 2457 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 92% | 40,161 psi | 64% | 2297 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,709 psi | 59% | 2257 fps | 99.4% |
| Shooters World Precision | <<locked>> | 80% | 33,823 psi | 54% | 2175 fps | 97.6% |
| Shooters World SW4350 | <<locked>> | 98% | 45,745 psi | 73% | 2411 fps | 95.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 48,196 psi | 77% | 2382 fps | 99.7% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,850 psi | 82% | 2451 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 32,518 psi | 52% | 2201 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,515 psi | 78% | 2372 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 38,101 psi | 61% | 2257 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 37,028 psi | 59% | 2251 fps | 97.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,465 psi | 63% | 2211 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,358 psi | 52% | 2090 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 45,368 psi | 73% | 2346 fps | 95% |
| Somchem S321 | <<locked>> | 80% | 43,395 psi | 70% | 2359 fps | 99.5% |
| Somchem S335 | <<locked>> | 80% | 38,812 psi | 62% | 2211 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 38,072 psi | 61% | 2260 fps | 97.3% |
| Somchem S355 | <<locked>> | 80% | 30,226 psi | 48% | 2116 fps | 95.4% |
| Somchem S365 | <<locked>> | 88% | 27,905 psi | 45% | 2139 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 44,817 psi | 72% | 2270 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,668 psi | 64% | 2208 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,795 psi | 56% | 2188 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,708 psi | 57% | 2195 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 80% | 28,660 psi | 46% | 2067 fps | 96.4% |
| Vihtavuori N160 | <<locked>> | 92% | 37,652 psi | 60% | 2293 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 40,451 psi | 65% | 2287 fps | 99% |
| Vihtavuori N540 | <<locked>> | 80% | 34,229 psi | 55% | 2185 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 92% | 36,593 psi | 59% | 2290 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 31,328 psi | 50% | 2133 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 39,349 psi | 63% | 2320 fps | 99.4% |
| Winchester 760 | <<locked>> | 98% | 46,978 psi | 75% | 2487 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,158 psi | 58% | 2251 fps | 97.6% |
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 104 powders for 8.5 x 63 loaded with the .338 | 231gr | Lapua Naturalis. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,664 fps; across all powders the maximum-charge window runs from 1,490 fps to 2,664 fps. Accurate 4350 gives the best case fill at 100 %, and 104 of the 104 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 231.0 gr projectile in 0.338" calls for a 1:14.5 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 52, ReloadSwiss RS 60 rank at the top here: for 8.5 x 63 with the .338 | 231gr | Lapua Naturalis 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.