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:1:12.5
Load data in caliber 8.5 x 63 with .338 | 250gr | Sierra MatchKing bullet and 106 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% | 55,303 psi | 89% | 2313 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 53,708 psi | 86% | 2339 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 56,202 psi | 90% | 2372 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 55,361 psi | 89% | 2395 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 53,171 psi | 85% | 2329 fps | 96.2% |
| Accurate 4064 | <<locked>> | 96% | 55,970 psi | 90% | 2411 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 47,964 psi | 77% | 2388 fps | 98.8% |
| Accurate LT-30 | <<locked>> | 82% | 54,911 psi | 88% | 2264 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,332 psi | 89% | 2287 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 54,302 psi | 87% | 2402 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 96% | 55,100 psi | 88% | 2398 fps | 99.7% |
| ADI AR 2219 | <<locked>> | 82% | 55,666 psi | 89% | 2372 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 53,577 psi | 86% | 2362 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 53,432 psi | 86% | 2339 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,143 psi | 88% | 2448 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 53,374 psi | 86% | 2500 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 54,549 psi | 87% | 2418 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,114 psi | 88% | 2316 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,172 psi | 88% | 2434 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,543 psi | 76% | 2392 fps | 98.9% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 54,636 psi | 88% | 2520 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,518 psi | 54% | 2165 fps | 96.8% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 53,809 psi | 86% | 2267 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 53,838 psi | 86% | 2418 fps | 99.5% |
| Bofors RP3 | <<locked>> | 96% | 54,839 psi | 88% | 2431 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 55,593 psi | 89% | 2398 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 88% | 55,448 psi | 89% | 2346 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 55,637 psi | 89% | 2431 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 53,954 psi | 87% | 2470 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 84% | 54,375 psi | 87% | 2359 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,129 psi | 88% | 2382 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 56,130 psi | 90% | 2441 fps | 99.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 51,358 psi | 82% | 2431 fps | 97.1% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 56,405 psi | 90% | 2448 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 90% | 54,839 psi | 88% | 2411 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,526 psi | 70% | 2290 fps | 99.3% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 53,388 psi | 86% | 2438 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 52,663 psi | 84% | 2464 fps | 96.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,085 psi | 56% | 1411 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,115 psi | 90% | 2411 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 54,085 psi | 87% | 2392 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 54,505 psi | 87% | 2382 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,158 psi | 88% | 2365 fps | 97.5% |
| IMR 4198 | <<locked>> | 84% | 55,521 psi | 89% | 2277 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 54,389 psi | 87% | 2388 fps | 97.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 45,643 psi | 73% | 2336 fps | 98.5% |
| IMR 4895 | <<locked>> | 92% | 53,084 psi | 85% | 2418 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 53,577 psi | 86% | 2362 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 53,476 psi | 86% | 2349 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 53,156 psi | 85% | 2379 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 54,259 psi | 87% | 2339 fps | 99.9% |
| Lovex S062 | <<locked>> | 94% | 53,969 psi | 87% | 2379 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 53,026 psi | 85% | 2375 fps | 98.4% |
| Lovex S070ᴾ | <<locked>> | 100% | 50,357 psi | 81% | 2359 fps | 96.9% |
| Norma 201 | <<locked>> | 92% | 56,434 psi | 90% | 2398 fps | 100% |
| Norma 202 | <<locked>> | 90% | 53,476 psi | 86% | 2359 fps | 100% |
| Norma 203B | <<locked>> | 94% | 54,273 psi | 87% | 2425 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 47,732 psi | 77% | 2382 fps | 98.7% |
| Ramshot Big Game | <<locked>> | 94% | 54,578 psi | 88% | 2448 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 46,833 psi | 75% | 2372 fps | 96.9% |
| Ramshot TAC | <<locked>> | 88% | 53,824 psi | 86% | 2379 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 88% | 52,895 psi | 85% | 2392 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 86% | 54,534 psi | 87% | 2365 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,317 psi | 57% | 1444 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 53,214 psi | 85% | 2346 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 53,432 psi | 86% | 2382 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,434 psi | 89% | 2493 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 54,708 psi | 88% | 2523 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 47,529 psi | 76% | 2405 fps | 98.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 48,443 psi | 78% | 2425 fps | 98.1% |
| Rottweil R 901 | <<locked>> | 88% | 54,244 psi | 87% | 2339 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 53,229 psi | 85% | 2349 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 54,360 psi | 87% | 2418 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 55,593 psi | 89% | 2398 fps | 97% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 53,026 psi | 85% | 2375 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 90% | 53,156 psi | 85% | 2379 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 53,969 psi | 87% | 2379 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 50,357 psi | 81% | 2359 fps | 96.9% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 52,808 psi | 85% | 2320 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 55,985 psi | 90% | 2385 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 56,260 psi | 90% | 2474 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,101 psi | 90% | 2333 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 55,477 psi | 89% | 2402 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 56,028 psi | 90% | 2421 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,042 psi | 88% | 2303 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 54,694 psi | 88% | 2303 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 53,563 psi | 86% | 2336 fps | 97.2% |
| Somchem S321 | <<locked>> | 86% | 54,491 psi | 87% | 2392 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,114 psi | 87% | 2303 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,027 psi | 88% | 2398 fps | 99.9% |
| Somchem S355 | <<locked>> | 98% | 54,940 psi | 88% | 2418 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,525 psi | 68% | 2339 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 86% | 55,129 psi | 88% | 2274 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,042 psi | 88% | 2290 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 56,072 psi | 90% | 2359 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 53,795 psi | 86% | 2339 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 53,069 psi | 85% | 2359 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,299 psi | 81% | 2379 fps | 98.9% |
| Vihtavuori N530 | <<locked>> | 88% | 54,012 psi | 87% | 2362 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 55,187 psi | 88% | 2379 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,095 psi | 79% | 2382 fps | 98.7% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,491 psi | 57% | 2228 fps | 96.8% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 51,198 psi | 82% | 2369 fps | 99.9% |
| Winchester 748 | <<locked>> | 88% | 53,258 psi | 85% | 2402 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 51,358 psi | 82% | 2431 fps | 97.1% |
| Winchester StaBALL Match | <<locked>> | 92% | 55,477 psi | 89% | 2428 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% | 43,468 psi | 70% | 2165 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,036 psi | 75% | 2257 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,839 psi | 57% | 2100 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,206 psi | 68% | 2221 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 49,922 psi | 80% | 2283 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 33,924 psi | 54% | 2090 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 34,040 psi | 55% | 2152 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 51,488 psi | 83% | 2224 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,895 psi | 83% | 2244 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,682 psi | 64% | 2182 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 33,968 psi | 54% | 2060 fps | 96% |
| ADI AR 2219 | <<locked>> | 80% | 51,837 psi | 83% | 2326 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,669 psi | 67% | 2192 fps | 99.4% |
| Alliant AR-Comp | <<locked>> | 80% | 41,075 psi | 66% | 2185 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,385 psi | 78% | 2356 fps | 99.8% |
| Alliant Power Pro 2000-MR | 46.2 gr | 80% | 35,868 psi | 58% | 2195 fps | 96.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,996 psi | 53% | 2073 fps | 97.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,994 psi | 79% | 2241 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,534 psi | 57% | 2123 fps | 96.7% |
| Alliant Reloder-16 | <<locked>> | 90% | 35,186 psi | 56% | 2165 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 82% | 30,443 psi | 49% | 2087 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 29,820 psi | 48% | 2077 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,430 psi | 81% | 2228 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,479 psi | 62% | 2182 fps | 96.9% |
| Bofors RP3 | <<locked>> | 80% | 32,314 psi | 52% | 2073 fps | 97.4% |
| Bofors RP7 | <<locked>> | 94% | 46,209 psi | 74% | 2267 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,845 psi | 70% | 2185 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,016 psi | 64% | 2211 fps | 99.5% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,671 psi | 70% | 2320 fps | 98.7% |
| Hodgdon H322 | <<locked>> | 80% | 47,674 psi | 76% | 2274 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,283 psi | 77% | 2297 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 35,708 psi | 57% | 2123 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 96% | 45,208 psi | 72% | 2339 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 96% | 49,705 psi | 80% | 2356 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 39,958 psi | 64% | 2192 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 30,095 psi | 48% | 2031 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,940 psi | 58% | 2165 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 98% | 49,037 psi | 79% | 2408 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,005 psi | 42% | 1257 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,522 psi | 62% | 2152 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 39,276 psi | 63% | 2192 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,592 psi | 57% | 2087 fps | 96.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 45,788 psi | 73% | 2234 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 49,559 psi | 79% | 2208 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 92% | 45,136 psi | 72% | 2251 fps | 95.3% |
| IMR 4831 | <<locked>> | 90% | 33,098 psi | 53% | 2116 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 36,361 psi | 58% | 2149 fps | 97.6% |
| IMR 8208 XBR | <<locked>> | 80% | 41,669 psi | 67% | 2192 fps | 99.4% |
| Lovex D073.5 | <<locked>> | 80% | 46,804 psi | 75% | 2264 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 38,334 psi | 61% | 2169 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 40,437 psi | 65% | 2136 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 35,360 psi | 57% | 2093 fps | 98.4% |
| Lovex S065 | <<locked>> | 90% | 39,218 psi | 63% | 2165 fps | 95.4% |
| Lovex S070 | <<locked>> | 96% | 44,382 psi | 71% | 2270 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 39,015 psi | 63% | 2146 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 39,015 psi | 63% | 2156 fps | 100% |
| Norma 203B | <<locked>> | 80% | 34,925 psi | 56% | 2116 fps | 97.2% |
| Norma URP | <<locked>> | 90% | 34,766 psi | 56% | 2156 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 34,418 psi | 55% | 2126 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 96% | 41,321 psi | 66% | 2280 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 41,510 psi | 67% | 2192 fps | 96.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,698 psi | 65% | 2211 fps | 98.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,223 psi | 73% | 2234 fps | 99% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,295 psi | 42% | 1289 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,876 psi | 75% | 2260 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 41,365 psi | 66% | 2201 fps | 95.2% |
| ReloadSwiss RS 52 | 44.7 gr | 80% | 36,651 psi | 59% | 2205 fps | 97.1% |
| ReloadSwiss RS 60 | 45.5 gr | 80% | 30,472 psi | 49% | 2096 fps | 98.2% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 36,303 psi | 58% | 2215 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 39,610 psi | 64% | 2270 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 42,931 psi | 69% | 2185 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 37,202 psi | 60% | 2106 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 30,516 psi | 49% | 2031 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 94% | 46,209 psi | 74% | 2267 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 90% | 39,218 psi | 63% | 2165 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,334 psi | 61% | 2169 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 35,360 psi | 57% | 2093 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 96% | 44,382 psi | 71% | 2270 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,530 psi | 79% | 2277 fps | 99.9% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,315 psi | 84% | 2339 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,488 psi | 50% | 2067 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,763 psi | 80% | 2257 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,624 psi | 64% | 2169 fps | 96.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,116 psi | 61% | 2156 fps | 97.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,640 psi | 65% | 2110 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,504 psi | 54% | 2001 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 43,714 psi | 70% | 2205 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 44,657 psi | 72% | 2257 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 40,147 psi | 64% | 2116 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,189 psi | 63% | 2169 fps | 98.1% |
| Somchem S355 | <<locked>> | 80% | 31,575 psi | 51% | 2037 fps | 96.6% |
| Somchem S365 | <<locked>> | 84% | 25,889 psi | 42% | 1978 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 46,064 psi | 74% | 2165 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,843 psi | 65% | 2110 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,230 psi | 58% | 2096 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,043 psi | 59% | 2103 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 29,965 psi | 48% | 1988 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 88% | 34,345 psi | 55% | 2113 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 41,669 psi | 67% | 2188 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 35,505 psi | 57% | 2093 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 90% | 35,650 psi | 57% | 2159 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 96% | 31,430 psi | 50% | 2139 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 30,501 psi | 49% | 2011 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 40,814 psi | 65% | 2228 fps | 99.8% |
| Winchester 760 | <<locked>> | 96% | 45,208 psi | 72% | 2339 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,420 psi | 60% | 2159 fps | 98.3% |
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 117 powders for 8.5 x 63 loaded with the .338 | 250gr | Sierra MatchKing. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,523 fps; across all powders the maximum-charge window runs from 1,411 fps to 2,523 fps. Accurate 3100 gives the best case fill at 100 %, and 117 of the 117 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 48–90 %, 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 3100, Accurate 4350, ADI AR 2209 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 | Sierra MatchKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.