Load Specifications
Load data in caliber 8.5 x 63 with .338 | 250gr | Alaska Bullet Works Kodiak PP SPBC bullet and 103 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, Alliant Reloder-17 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>> | 86% | 55,898 psi | 90% | 2349 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 54,099 psi | 87% | 2372 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 53,751 psi | 86% | 2369 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 56,043 psi | 90% | 2431 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,606 psi | 86% | 2372 fps | 97% |
| Accurate 4064 | <<locked>> | 92% | 53,780 psi | 86% | 2411 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,765 psi | 85% | 2480 fps | 99.6% |
| ADI AR 2206H | <<locked>> | 88% | 54,679 psi | 88% | 2441 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 55,579 psi | 89% | 2438 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,780 psi | 86% | 2395 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,433 psi | 87% | 2372 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,724 psi | 89% | 2487 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 53,940 psi | 86% | 2543 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 55,230 psi | 89% | 2457 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,535 psi | 89% | 2349 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 56,173 psi | 90% | 2480 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 51,271 psi | 82% | 2487 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,854 psi | 90% | 2569 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,550 psi | 59% | 2264 fps | 98.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,161 psi | 64% | 2388 fps | 97.3% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 54,244 psi | 87% | 2454 fps | 99.7% |
| Bofors RP3 | <<locked>> | 94% | 55,782 psi | 89% | 2470 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 56,115 psi | 90% | 2444 fps | 97.7% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,796 psi | 89% | 2382 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 52,750 psi | 85% | 2425 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,723 psi | 88% | 2510 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 54,679 psi | 88% | 2388 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,521 psi | 89% | 2415 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 53,417 psi | 86% | 2438 fps | 99.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 56,130 psi | 90% | 2530 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 96% | 53,606 psi | 86% | 2448 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 88% | 55,172 psi | 88% | 2448 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 47,413 psi | 76% | 2379 fps | 99.9% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 54,128 psi | 87% | 2477 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 53,243 psi | 85% | 2513 fps | 97.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,259 psi | 57% | 1444 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 53,272 psi | 85% | 2408 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 55,114 psi | 88% | 2431 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 55,230 psi | 89% | 2425 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 55,405 psi | 89% | 2408 fps | 98.1% |
| IMR 4198 | <<locked>> | 82% | 55,477 psi | 89% | 2306 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,634 psi | 84% | 2421 fps | 97.2% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,708 psi | 88% | 2428 fps | 97.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 50,227 psi | 81% | 2431 fps | 99.4% |
| IMR 4895 | <<locked>> | 90% | 54,027 psi | 87% | 2461 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 53,780 psi | 86% | 2395 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 53,954 psi | 87% | 2385 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 54,230 psi | 87% | 2421 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,491 psi | 87% | 2375 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 54,868 psi | 88% | 2421 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 53,766 psi | 86% | 2421 fps | 98.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,505 psi | 87% | 2454 fps | 98.2% |
| Norma 201 | <<locked>> | 88% | 53,563 psi | 86% | 2392 fps | 100% |
| Norma 202 | <<locked>> | 88% | 54,012 psi | 87% | 2395 fps | 100% |
| Norma 203B | <<locked>> | 92% | 55,317 psi | 89% | 2467 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 53,330 psi | 86% | 2467 fps | 95.9% |
| Norma URPᴾ | <<locked>> | 100% | 52,156 psi | 84% | 2474 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 92% | 55,724 psi | 89% | 2493 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 51,213 psi | 82% | 2474 fps | 98.3% |
| Ramshot TAC | <<locked>> | 86% | 54,143 psi | 87% | 2418 fps | 99.1% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,563 psi | 86% | 2434 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,824 psi | 88% | 2402 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,766 psi | 57% | 1480 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 53,287 psi | 85% | 2379 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 53,824 psi | 86% | 2425 fps | 98.4% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 56,420 psi | 90% | 2536 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,811 psi | 89% | 2569 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 52,214 psi | 84% | 2503 fps | 99.5% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,750 psi | 85% | 2530 fps | 99.3% |
| Rottweil R 901 | <<locked>> | 86% | 54,607 psi | 88% | 2372 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 53,983 psi | 87% | 2392 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,651 psi | 89% | 2464 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 56,115 psi | 90% | 2444 fps | 97.7% |
| Shooters World Long Rifle | <<locked>> | 98% | 53,766 psi | 86% | 2421 fps | 98.9% |
| Shooters World Match Rifle | <<locked>> | 88% | 54,230 psi | 87% | 2421 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,868 psi | 88% | 2421 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,505 psi | 87% | 2454 fps | 98.2% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 53,780 psi | 86% | 2474 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 56,086 psi | 90% | 2444 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 53,098 psi | 85% | 2418 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 55,245 psi | 89% | 2336 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 55,027 psi | 88% | 2336 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 54,288 psi | 87% | 2382 fps | 97.9% |
| Somchem S321 | <<locked>> | 84% | 54,940 psi | 88% | 2428 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,505 psi | 87% | 2339 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 55,390 psi | 89% | 2434 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 56,101 psi | 90% | 2461 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,586 psi | 75% | 2431 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 55,172 psi | 88% | 2303 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,390 psi | 89% | 2323 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 53,447 psi | 86% | 2359 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,389 psi | 87% | 2375 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 54,056 psi | 87% | 2402 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,708 psi | 88% | 2467 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 86% | 54,360 psi | 87% | 2398 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,811 psi | 89% | 2415 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,693 psi | 86% | 2474 fps | 99.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,349 psi | 63% | 2326 fps | 98.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 55,405 psi | 89% | 2454 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 53,940 psi | 86% | 2441 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 56,130 psi | 90% | 2530 fps | 98.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,619 psi | 52% | 2254 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 88% | 52,736 psi | 85% | 2425 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% | 46,514 psi | 75% | 2234 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,705 psi | 81% | 2333 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 39,044 psi | 63% | 2172 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,788 psi | 73% | 2300 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 46,978 psi | 75% | 2277 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 36,927 psi | 59% | 2165 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 32,677 psi | 52% | 2149 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 42,598 psi | 68% | 2260 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 36,448 psi | 58% | 2139 fps | 97.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,672 psi | 72% | 2267 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 80% | 44,744 psi | 72% | 2254 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 52,170 psi | 84% | 2441 fps | 100% |
| Alliant Power Pro 2000-MR | 49.9 gr | 80% | 38,609 psi | 62% | 2287 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,853 psi | 57% | 2156 fps | 98.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 52,315 psi | 84% | 2310 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,406 psi | 62% | 2208 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,533 psi | 54% | 2162 fps | 95.8% |
| Alliant Reloder-17 | 49.1 gr | 80% | 30,777 psi | 49% | 2126 fps | 96.6% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,776 psi | 46% | 2080 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,070 psi | 56% | 2280 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,669 psi | 67% | 2267 fps | 98.2% |
| Bofors RP3 | <<locked>> | 80% | 35,186 psi | 56% | 2156 fps | 98.6% |
| Bofors RP7 | <<locked>> | 90% | 43,903 psi | 70% | 2264 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,528 psi | 75% | 2257 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 43,279 psi | 69% | 2290 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,718 psi | 77% | 2411 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 80% | 51,184 psi | 82% | 2346 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,793 psi | 83% | 2369 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 36,303 psi | 58% | 2162 fps | 96.1% |
| Hodgdon H414 | <<locked>> | 90% | 40,553 psi | 65% | 2290 fps | 95% |
| Hodgdon H4350 | <<locked>> | 92% | 47,224 psi | 76% | 2356 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 42,989 psi | 69% | 2270 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,892 psi | 46% | 2031 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,870 psi | 62% | 2247 fps | 99.3% |
| Hodgdon Superformance | <<locked>> | 94% | 46,209 psi | 74% | 2405 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,353 psi | 42% | 1289 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,394 psi | 66% | 2231 fps | 99.3% |
| IMR 3031 | <<locked>> | 80% | 42,656 psi | 68% | 2267 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,247 psi | 61% | 2165 fps | 98% |
| IMR 4166 Enduron | <<locked>> | 82% | 43,323 psi | 69% | 2228 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 52,489 psi | 84% | 2274 fps | 100% |
| IMR 4350 | <<locked>> | 94% | 43,758 psi | 70% | 2287 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 88% | 43,033 psi | 69% | 2251 fps | 95.4% |
| IMR 4831 | <<locked>> | 86% | 31,894 psi | 51% | 2113 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 39,334 psi | 63% | 2231 fps | 98.7% |
| IMR 8208 XBR | <<locked>> | 80% | 44,672 psi | 72% | 2267 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 80% | 50,299 psi | 81% | 2339 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,655 psi | 67% | 2247 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 43,047 psi | 69% | 2211 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 38,101 psi | 61% | 2169 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 37,608 psi | 60% | 2165 fps | 95.5% |
| Lovex S070 | <<locked>> | 90% | 40,074 psi | 64% | 2228 fps | 95% |
| Norma 201 | <<locked>> | 80% | 41,858 psi | 67% | 2221 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 42,148 psi | 68% | 2231 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,797 psi | 61% | 2198 fps | 98.3% |
| Norma 204 | <<locked>> | 98% | 49,676 psi | 80% | 2415 fps | 95.1% |
| Norma URP | <<locked>> | 86% | 33,402 psi | 54% | 2152 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 37,246 psi | 60% | 2211 fps | 98% |
| Ramshot Hunter | <<locked>> | 92% | 39,552 psi | 63% | 2280 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 44,556 psi | 71% | 2277 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,816 psi | 70% | 2290 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 80% | 48,254 psi | 77% | 2313 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,658 psi | 43% | 1319 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 50,270 psi | 81% | 2339 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 39,073 psi | 63% | 2192 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,176 psi | 64% | 2297 fps | 98.4% |
| ReloadSwiss RS 60 | 49.1 gr | 80% | 32,779 psi | 53% | 2182 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 32,750 psi | 53% | 2165 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 37,681 psi | 60% | 2270 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 45,876 psi | 74% | 2257 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 40,001 psi | 64% | 2185 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 80% | 33,199 psi | 53% | 2110 fps | 97.8% |
| Rottweil R 907 | <<locked>> | 90% | 43,903 psi | 70% | 2264 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 86% | 37,608 psi | 60% | 2165 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,655 psi | 67% | 2247 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 38,101 psi | 61% | 2169 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 90% | 40,074 psi | 64% | 2228 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,243 psi | 55% | 2156 fps | 97.3% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,641 psi | 68% | 2251 fps | 97.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 41,249 psi | 66% | 2238 fps | 98.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,395 psi | 70% | 2182 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,955 psi | 58% | 2070 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 41,800 psi | 67% | 2205 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 48,153 psi | 77% | 2336 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 42,859 psi | 69% | 2182 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 42,453 psi | 68% | 2251 fps | 99% |
| Somchem S355 | <<locked>> | 80% | 34,171 psi | 55% | 2116 fps | 97.9% |
| Somchem S365 | <<locked>> | 80% | 24,772 psi | 40% | 1972 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 49,008 psi | 79% | 2231 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,656 psi | 70% | 2175 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 39,233 psi | 63% | 2165 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,784 psi | 64% | 2175 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,387 psi | 52% | 2064 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 84% | 32,822 psi | 53% | 2110 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 44,643 psi | 72% | 2264 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 38,363 psi | 62% | 2169 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 34,156 psi | 55% | 2156 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 92% | 30,516 psi | 49% | 2142 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,834 psi | 46% | 1998 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 44,106 psi | 71% | 2303 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 40,553 psi | 65% | 2290 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,645 psi | 46% | 2139 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,538 psi | 65% | 2241 fps | 99.2% |
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 119 powders for 8.5 x 63 loaded with the .338 | 250gr | Alaska Bullet Works Kodiak PP SPBC. Alliant Reloder-17 delivers the highest muzzle velocity at 2,569 fps; across all powders the maximum-charge window runs from 1,444 fps to 2,569 fps. Accurate 3100 gives the best case fill at 100 %, and 119 of the 119 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 1:16.0 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, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for 8.5 x 63 with the .338 | 250gr | Alaska Bullet Works Kodiak PP SPBC they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2209, Alliant Reloder-19, Alliant Reloder-22 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.