Load Specifications
Bullet Manufacturer:Sierra
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:1:14.0
Load data in caliber 8.5 x 63 with .338 | 250gr | Sierra GameKing 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% | 54,346 psi | 87% | 2320 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,985 psi | 90% | 2385 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 55,637 psi | 89% | 2382 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 54,056 psi | 87% | 2398 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,593 psi | 89% | 2385 fps | 97.1% |
| Accurate 4064 | <<locked>> | 94% | 55,376 psi | 89% | 2421 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 50,720 psi | 81% | 2444 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 88% | 53,113 psi | 85% | 2408 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 94% | 54,186 psi | 87% | 2408 fps | 99.8% |
| ADI Benchmark 8208 | <<locked>> | 88% | 55,680 psi | 89% | 2408 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 56,188 psi | 90% | 2382 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 54,056 psi | 87% | 2454 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 55,956 psi | 90% | 2556 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 53,737 psi | 86% | 2428 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 54,085 psi | 87% | 2320 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 54,418 psi | 87% | 2444 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,559 psi | 79% | 2448 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 98% | 53,853 psi | 86% | 2530 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,230 psi | 56% | 2221 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 38,769 psi | 62% | 2346 fps | 96.6% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 55,912 psi | 90% | 2310 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 56,115 psi | 90% | 2467 fps | 99.8% |
| Bofors RP3 | <<locked>> | 94% | 53,940 psi | 86% | 2438 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 54,636 psi | 88% | 2411 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 86% | 54,273 psi | 87% | 2349 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 54,752 psi | 88% | 2438 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 52,765 psi | 85% | 2474 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 53,142 psi | 85% | 2359 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 53,896 psi | 86% | 2382 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 55,332 psi | 89% | 2451 fps | 99.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 54,070 psi | 87% | 2490 fps | 97.9% |
| Hodgdon H4350 | <<locked>> | 98% | 55,405 psi | 89% | 2457 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 88% | 53,592 psi | 86% | 2415 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,876 psi | 74% | 2346 fps | 99.7% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,956 psi | 90% | 2490 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 55,303 psi | 89% | 2526 fps | 97.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,143 psi | 56% | 1430 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 54,998 psi | 88% | 2418 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 53,171 psi | 85% | 2398 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 53,722 psi | 86% | 2392 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 90% | 54,143 psi | 87% | 2375 fps | 97.7% |
| IMR 4198 | <<locked>> | 82% | 54,244 psi | 87% | 2280 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 50,995 psi | 82% | 2385 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 98% | 56,420 psi | 90% | 2438 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,399 psi | 78% | 2395 fps | 99.1% |
| IMR 4895 | <<locked>> | 92% | 55,767 psi | 89% | 2470 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 55,680 psi | 89% | 2408 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 55,912 psi | 90% | 2398 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 55,956 psi | 90% | 2428 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 53,301 psi | 85% | 2346 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 53,287 psi | 85% | 2388 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 55,492 psi | 89% | 2431 fps | 98.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,750 psi | 85% | 2415 fps | 97.7% |
| Norma 201 | <<locked>> | 90% | 55,158 psi | 88% | 2402 fps | 100% |
| Norma 202 | <<locked>> | 90% | 55,695 psi | 89% | 2402 fps | 100% |
| Norma 203B | <<locked>> | 92% | 53,563 psi | 86% | 2434 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 50,270 psi | 81% | 2434 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 92% | 53,809 psi | 86% | 2457 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 49,371 psi | 79% | 2431 fps | 97.8% |
| Ramshot TAC | <<locked>> | 88% | 56,028 psi | 90% | 2428 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 88% | 55,303 psi | 89% | 2444 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 53,476 psi | 86% | 2372 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,636 psi | 57% | 1467 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,419 psi | 89% | 2392 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 55,883 psi | 90% | 2438 fps | 98.5% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 54,491 psi | 87% | 2500 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 53,722 psi | 86% | 2530 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 50,140 psi | 80% | 2464 fps | 99.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,792 psi | 81% | 2484 fps | 98.9% |
| Rottweil R 901 | <<locked>> | 88% | 56,362 psi | 90% | 2382 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 55,666 psi | 89% | 2398 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 53,809 psi | 86% | 2431 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 54,636 psi | 88% | 2411 fps | 97.2% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 55,492 psi | 89% | 2431 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 90% | 55,956 psi | 90% | 2428 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 53,287 psi | 85% | 2388 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,750 psi | 85% | 2415 fps | 97.7% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 54,882 psi | 88% | 2365 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 55,405 psi | 89% | 2484 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 55,027 psi | 88% | 2339 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 54,447 psi | 87% | 2411 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 54,810 psi | 88% | 2428 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 53,882 psi | 86% | 2310 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 53,563 psi | 86% | 2306 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,941 psi | 90% | 2388 fps | 97.9% |
| Somchem S321 | <<locked>> | 84% | 53,447 psi | 86% | 2398 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 56,159 psi | 90% | 2346 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 53,708 psi | 86% | 2402 fps | 99.9% |
| Somchem S355 | <<locked>> | 96% | 54,375 psi | 87% | 2428 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,860 psi | 72% | 2395 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 53,954 psi | 87% | 2280 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 53,983 psi | 87% | 2297 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 55,288 psi | 89% | 2369 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 56,130 psi | 90% | 2382 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,796 psi | 89% | 2411 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,866 psi | 85% | 2431 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 88% | 56,434 psi | 90% | 2411 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 54,172 psi | 87% | 2385 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,953 psi | 83% | 2441 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,652 psi | 60% | 2287 fps | 97.7% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,490 psi | 86% | 2418 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 55,970 psi | 90% | 2451 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 54,389 psi | 87% | 2493 fps | 97.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 31,415 psi | 50% | 2205 fps | 97% |
| Winchester StaBALL Match | <<locked>> | 90% | 54,476 psi | 87% | 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% | 45,179 psi | 72% | 2205 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 49,298 psi | 79% | 2303 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,753 psi | 61% | 2142 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 44,135 psi | 71% | 2267 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 45,701 psi | 73% | 2244 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 35,723 psi | 57% | 2136 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 33,620 psi | 54% | 2159 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 41,539 psi | 67% | 2231 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 80% | 35,230 psi | 56% | 2103 fps | 96.7% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,540 psi | 70% | 2238 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 43,236 psi | 69% | 2228 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,749 psi | 81% | 2408 fps | 100% |
| Alliant Power Pro 2000-MR | 48.3 gr | 80% | 37,333 psi | 60% | 2247 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,606 psi | 55% | 2123 fps | 98.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,865 psi | 82% | 2280 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,318 psi | 60% | 2175 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 32,561 psi | 52% | 2126 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,863 psi | 48% | 2090 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 29,544 psi | 47% | 2087 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 36,260 psi | 58% | 2293 fps | 95.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 52,330 psi | 84% | 2267 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,306 psi | 65% | 2231 fps | 97.7% |
| Bofors RP3 | <<locked>> | 80% | 34,113 psi | 55% | 2126 fps | 98.2% |
| Bofors RP7 | <<locked>> | 92% | 45,295 psi | 73% | 2274 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,455 psi | 73% | 2231 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,771 psi | 67% | 2257 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,093 psi | 74% | 2375 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 80% | 49,588 psi | 80% | 2316 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 50,473 psi | 81% | 2339 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 35,114 psi | 56% | 2129 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 92% | 41,597 psi | 67% | 2297 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 94% | 48,791 psi | 78% | 2365 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 41,858 psi | 67% | 2241 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 27,963 psi | 45% | 1998 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,608 psi | 60% | 2215 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 94% | 44,657 psi | 72% | 2365 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,208 psi | 42% | 1276 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,118 psi | 64% | 2198 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 41,292 psi | 66% | 2238 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,956 psi | 59% | 2129 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 82% | 42,206 psi | 68% | 2195 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 51,256 psi | 82% | 2244 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 45,252 psi | 73% | 2300 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 90% | 44,324 psi | 71% | 2260 fps | 95.5% |
| IMR 4831 | <<locked>> | 88% | 32,822 psi | 53% | 2126 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 38,218 psi | 61% | 2201 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 43,540 psi | 70% | 2238 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 48,950 psi | 78% | 2310 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 40,263 psi | 65% | 2215 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 41,800 psi | 67% | 2178 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 36,767 psi | 59% | 2136 fps | 99% |
| Lovex S065 | <<locked>> | 88% | 38,566 psi | 62% | 2172 fps | 95.6% |
| Lovex S070 | <<locked>> | 92% | 41,220 psi | 66% | 2238 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 40,698 psi | 65% | 2192 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 40,741 psi | 65% | 2198 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,738 psi | 59% | 2169 fps | 97.9% |
| Norma URP | <<locked>> | 88% | 34,403 psi | 55% | 2165 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 35,955 psi | 58% | 2175 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 94% | 40,843 psi | 65% | 2290 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 43,236 psi | 69% | 2241 fps | 97% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,627 psi | 68% | 2260 fps | 99% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,847 psi | 75% | 2280 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,513 psi | 43% | 1309 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,834 psi | 78% | 2306 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 40,567 psi | 65% | 2205 fps | 95.3% |
| ReloadSwiss RS 52 | 46.9 gr | 80% | 38,769 psi | 62% | 2260 fps | 97.9% |
| ReloadSwiss RS 60 | 47.6 gr | 80% | 31,778 psi | 51% | 2146 fps | 99% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 33,620 psi | 54% | 2175 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 36,564 psi | 59% | 2231 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 44,599 psi | 72% | 2224 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,870 psi | 62% | 2152 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 32,097 psi | 51% | 2080 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 92% | 45,295 psi | 73% | 2274 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 38,566 psi | 62% | 2172 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 40,263 psi | 65% | 2215 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 36,767 psi | 59% | 2136 fps | 99% |
| Shooters World SW4350 | <<locked>> | 92% | 41,220 psi | 66% | 2238 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,343 psi | 82% | 2320 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,156 psi | 53% | 2119 fps | 96.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,663 psi | 83% | 2300 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,466 psi | 66% | 2218 fps | 97.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,045 psi | 64% | 2208 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,206 psi | 68% | 2152 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,896 psi | 56% | 2041 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 43,134 psi | 69% | 2211 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 46,673 psi | 75% | 2306 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 41,785 psi | 67% | 2156 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,046 psi | 66% | 2218 fps | 98.7% |
| Somchem S355 | <<locked>> | 80% | 33,112 psi | 53% | 2083 fps | 97.4% |
| Somchem S365 | <<locked>> | 82% | 25,527 psi | 41% | 1985 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 47,747 psi | 77% | 2205 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,453 psi | 68% | 2149 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,913 psi | 61% | 2139 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,667 psi | 62% | 2146 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,401 psi | 50% | 2034 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 33,808 psi | 54% | 2119 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 43,540 psi | 70% | 2234 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 80% | 37,188 psi | 60% | 2139 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 35,259 psi | 57% | 2169 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 94% | 31,285 psi | 50% | 2152 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 27,963 psi | 45% | 1965 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 42,743 psi | 69% | 2274 fps | 99.9% |
| Winchester 760 | <<locked>> | 92% | 41,829 psi | 67% | 2300 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 98% | 29,501 psi | 47% | 2149 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 39,117 psi | 63% | 2208 fps | 98.9% |
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 | Sierra GameKing. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,556 fps; across all powders the maximum-charge window runs from 1,430 fps to 2,556 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 1:14.0 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 | Sierra GameKing 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.