Load Specifications
Bullet Manufacturer:Sierra
Bullet Weight:225 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:1:15.5
Load data in caliber 8.5 x 63 with .338 | 225gr | Sierra Pro-Hunter 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 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% | 55,187 psi | 88% | 2480 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 53,606 psi | 86% | 2507 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 56,217 psi | 90% | 2539 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 55,201 psi | 89% | 2562 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 55,970 psi | 90% | 2579 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 47,993 psi | 77% | 2546 fps | 98.3% |
| Accurate LT-30 | <<locked>> | 82% | 54,650 psi | 88% | 2428 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,056 psi | 88% | 2451 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 54,259 psi | 87% | 2569 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 96% | 54,911 psi | 88% | 2562 fps | 99.5% |
| ADI AR 2219 | <<locked>> | 82% | 55,506 psi | 89% | 2539 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 53,519 psi | 86% | 2526 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 53,505 psi | 86% | 2507 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,042 psi | 88% | 2621 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 53,388 psi | 86% | 2667 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 54,462 psi | 87% | 2585 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,114 psi | 88% | 2484 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,172 psi | 88% | 2602 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,355 psi | 76% | 2549 fps | 98.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 54,926 psi | 88% | 2694 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,562 psi | 54% | 2303 fps | 95.9% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 53,737 psi | 86% | 2428 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 53,737 psi | 86% | 2582 fps | 99.2% |
| Bofors RP3 | <<locked>> | 96% | 54,737 psi | 88% | 2598 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 55,579 psi | 89% | 2562 fps | 96.4% |
| Hodgdon Benchmark | <<locked>> | 88% | 55,637 psi | 89% | 2513 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 55,709 psi | 89% | 2598 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 53,969 psi | 87% | 2641 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 84% | 53,983 psi | 87% | 2523 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,085 psi | 88% | 2549 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 56,159 psi | 90% | 2605 fps | 99% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 51,358 psi | 82% | 2592 fps | 96.4% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 56,275 psi | 90% | 2612 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 90% | 54,795 psi | 88% | 2579 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,468 psi | 70% | 2441 fps | 98.9% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 53,359 psi | 86% | 2608 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,824 psi | 56% | 1522 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,130 psi | 90% | 2582 fps | 99.9% |
| IMR 3031 | <<locked>> | 90% | 54,157 psi | 87% | 2566 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 54,563 psi | 87% | 2549 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,274 psi | 89% | 2530 fps | 96.9% |
| IMR 4198 | <<locked>> | 84% | 55,463 psi | 89% | 2448 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 54,259 psi | 87% | 2546 fps | 96.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 45,730 psi | 73% | 2493 fps | 98% |
| IMR 4895 | <<locked>> | 92% | 53,069 psi | 85% | 2585 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 88% | 53,519 psi | 86% | 2526 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 53,417 psi | 86% | 2513 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 53,316 psi | 85% | 2549 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 54,302 psi | 87% | 2503 fps | 99.7% |
| Lovex S062 | <<locked>> | 94% | 53,998 psi | 87% | 2546 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 53,084 psi | 85% | 2539 fps | 97.9% |
| Lovex S070ᴾ | <<locked>> | 100% | 50,241 psi | 81% | 2516 fps | 96.3% |
| Norma 201 | <<locked>> | 92% | 56,391 psi | 90% | 2566 fps | 100% |
| Norma 202 | <<locked>> | 90% | 53,345 psi | 86% | 2523 fps | 100% |
| Norma 203B | <<locked>> | 94% | 54,273 psi | 87% | 2592 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 47,616 psi | 76% | 2539 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 94% | 54,607 psi | 88% | 2615 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 46,963 psi | 75% | 2530 fps | 96.3% |
| Ramshot TAC | <<locked>> | 88% | 53,693 psi | 86% | 2539 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 88% | 52,895 psi | 85% | 2556 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 86% | 54,549 psi | 87% | 2530 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,215 psi | 56% | 1558 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 53,185 psi | 85% | 2513 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 53,417 psi | 86% | 2543 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,259 psi | 89% | 2661 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 54,679 psi | 88% | 2694 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 47,514 psi | 76% | 2566 fps | 98% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 48,443 psi | 78% | 2582 fps | 97.5% |
| Rottweil R 901 | <<locked>> | 88% | 54,215 psi | 87% | 2507 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 53,374 psi | 86% | 2516 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 54,592 psi | 88% | 2589 fps | 99.9% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 55,579 psi | 89% | 2562 fps | 96.4% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 53,084 psi | 85% | 2539 fps | 97.9% |
| Shooters World Match Rifle | <<locked>> | 90% | 53,316 psi | 85% | 2549 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 53,998 psi | 87% | 2546 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 50,241 psi | 81% | 2516 fps | 96.3% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 56,362 psi | 90% | 2530 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 55,622 psi | 89% | 2549 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 52,910 psi | 85% | 2598 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,028 psi | 90% | 2503 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 55,419 psi | 89% | 2566 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 55,883 psi | 90% | 2589 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,143 psi | 88% | 2470 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 54,534 psi | 87% | 2464 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 53,548 psi | 86% | 2497 fps | 96.6% |
| Somchem S321 | <<locked>> | 86% | 54,679 psi | 88% | 2559 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,056 psi | 87% | 2467 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 54,882 psi | 88% | 2559 fps | 99.7% |
| Somchem S355 | <<locked>> | 98% | 54,955 psi | 88% | 2585 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,395 psi | 68% | 2490 fps | 99.6% |
| Vihtavuori N130 | <<locked>> | 86% | 54,853 psi | 88% | 2438 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,114 psi | 88% | 2457 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 55,912 psi | 90% | 2530 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 53,592 psi | 86% | 2503 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 53,301 psi | 85% | 2526 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,328 psi | 81% | 2539 fps | 98.5% |
| Vihtavuori N530 | <<locked>> | 88% | 53,838 psi | 86% | 2526 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 55,187 psi | 88% | 2546 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,342 psi | 79% | 2543 fps | 98.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,505 psi | 57% | 2369 fps | 96% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 51,372 psi | 82% | 2530 fps | 99.8% |
| Winchester 748 | <<locked>> | 88% | 53,200 psi | 85% | 2569 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 51,648 psi | 83% | 2598 fps | 96.5% |
| Winchester StaBALL Match | <<locked>> | 92% | 55,651 psi | 89% | 2598 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% | 43,265 psi | 69% | 2320 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 46,963 psi | 75% | 2415 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 35,694 psi | 57% | 2244 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,061 psi | 67% | 2372 fps | 99.9% |
| Accurate 4064 | <<locked>> | 80% | 33,779 psi | 54% | 2231 fps | 99.5% |
| Accurate 4350 | <<locked>> | 92% | 36,245 psi | 58% | 2339 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 51,547 psi | 83% | 2388 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 51,953 psi | 83% | 2411 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,581 psi | 63% | 2329 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 80% | 33,707 psi | 54% | 2195 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 51,938 psi | 83% | 2497 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 41,597 psi | 67% | 2343 fps | 99% |
| Alliant AR-Comp | <<locked>> | 80% | 41,017 psi | 66% | 2343 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,269 psi | 77% | 2520 fps | 99.6% |
| Alliant Power Pro 2000-MR | 50.4 gr | 80% | 35,636 psi | 57% | 2336 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,025 psi | 53% | 2215 fps | 96.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 48,907 psi | 78% | 2405 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,462 psi | 57% | 2267 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 92% | 37,246 psi | 60% | 2352 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 84% | 32,329 psi | 52% | 2270 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 98% | 31,575 psi | 51% | 2254 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,372 psi | 81% | 2385 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,421 psi | 62% | 2326 fps | 96.2% |
| Bofors RP3 | <<locked>> | 80% | 32,343 psi | 52% | 2215 fps | 96.7% |
| Bofors RP7 | <<locked>> | 96% | 49,197 psi | 79% | 2467 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,642 psi | 70% | 2336 fps | 99.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 39,827 psi | 64% | 2359 fps | 99.2% |
| Hodgdon CFE223 | <<locked>> | 80% | 43,685 psi | 70% | 2477 fps | 98.2% |
| Hodgdon H322 | <<locked>> | 80% | 47,587 psi | 76% | 2434 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,327 psi | 77% | 2457 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 38,072 psi | 61% | 2313 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 98% | 48,138 psi | 77% | 2543 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 98% | 52,808 psi | 85% | 2562 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 39,885 psi | 64% | 2339 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 31,952 psi | 51% | 2211 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 35,708 psi | 57% | 2306 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,049 psi | 42% | 1362 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,479 psi | 62% | 2300 fps | 97.9% |
| IMR 3031 | <<locked>> | 80% | 38,986 psi | 63% | 2343 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,331 psi | 57% | 2224 fps | 96% |
| IMR 4166 Enduron | <<locked>> | 88% | 48,805 psi | 78% | 2434 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 49,168 psi | 79% | 2369 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 48,153 psi | 77% | 2454 fps | 95.3% |
| IMR 4831 | <<locked>> | 92% | 35,346 psi | 57% | 2303 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 36,289 psi | 58% | 2297 fps | 96.9% |
| IMR 8208 XBR | <<locked>> | 80% | 41,597 psi | 67% | 2343 fps | 99% |
| Lovex D073.5 | <<locked>> | 80% | 46,731 psi | 75% | 2421 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 38,189 psi | 61% | 2316 fps | 99.5% |
| Lovex S060 | <<locked>> | 80% | 40,176 psi | 64% | 2277 fps | 97.8% |
| Lovex S062 | <<locked>> | 80% | 35,070 psi | 56% | 2231 fps | 97.8% |
| Lovex S065 | <<locked>> | 92% | 41,698 psi | 67% | 2356 fps | 95.4% |
| Lovex S070 | <<locked>> | 98% | 47,413 psi | 76% | 2474 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 38,870 psi | 62% | 2293 fps | 98.6% |
| Norma 202 | <<locked>> | 80% | 39,059 psi | 63% | 2306 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 34,853 psi | 56% | 2257 fps | 96.4% |
| Norma URP | <<locked>> | 92% | 36,912 psi | 59% | 2343 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 34,243 psi | 55% | 2264 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 98% | 44,135 psi | 71% | 2480 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 41,423 psi | 66% | 2339 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 40,727 psi | 65% | 2362 fps | 97.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,005 psi | 72% | 2385 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,295 psi | 42% | 1394 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 46,833 psi | 75% | 2421 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 44,034 psi | 71% | 2395 fps | 95.2% |
| ReloadSwiss RS 52 | 48.9 gr | 80% | 36,724 psi | 59% | 2352 fps | 96.4% |
| ReloadSwiss RS 60 | 49.7 gr | 80% | 30,429 psi | 49% | 2231 fps | 97.4% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 38,885 psi | 62% | 2411 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 42,424 psi | 68% | 2474 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 42,815 psi | 69% | 2336 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 36,985 psi | 59% | 2247 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 80% | 30,371 psi | 49% | 2162 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 96% | 49,197 psi | 79% | 2467 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 92% | 41,698 psi | 67% | 2356 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,189 psi | 61% | 2316 fps | 99.5% |
| Shooters World Precision | <<locked>> | 80% | 35,070 psi | 56% | 2231 fps | 97.8% |
| Shooters World SW4350 | <<locked>> | 98% | 47,413 psi | 76% | 2474 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,313 psi | 79% | 2434 fps | 99.7% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,286 psi | 84% | 2507 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 33,605 psi | 54% | 2254 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,647 psi | 80% | 2421 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,566 psi | 63% | 2313 fps | 95.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,189 psi | 61% | 2303 fps | 97.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,596 psi | 65% | 2260 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,431 psi | 54% | 2142 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 46,760 psi | 75% | 2398 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 44,599 psi | 72% | 2411 fps | 99.6% |
| Somchem S335 | <<locked>> | 80% | 40,016 psi | 64% | 2264 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,146 psi | 63% | 2313 fps | 97.5% |
| Somchem S355 | <<locked>> | 80% | 31,444 psi | 50% | 2172 fps | 95.7% |
| Somchem S365 | <<locked>> | 86% | 27,398 psi | 44% | 2149 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 45,977 psi | 74% | 2323 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,770 psi | 65% | 2260 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,114 psi | 58% | 2244 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,840 psi | 59% | 2247 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 29,791 psi | 48% | 2116 fps | 96.6% |
| Vihtavuori N160 | <<locked>> | 90% | 36,593 psi | 59% | 2303 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 41,698 psi | 67% | 2339 fps | 99.1% |
| Vihtavuori N540 | <<locked>> | 80% | 35,476 psi | 57% | 2238 fps | 99.4% |
| Vihtavuori N550 | <<locked>> | 92% | 38,000 psi | 61% | 2349 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 98% | 33,446 psi | 54% | 2323 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 32,547 psi | 52% | 2188 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 40,582 psi | 65% | 2375 fps | 99.5% |
| Winchester 760 | <<locked>> | 98% | 48,414 psi | 78% | 2546 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,289 psi | 60% | 2303 fps | 97.7% |
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 | 225gr | Sierra Pro-Hunter. Alliant Reloder-17 delivers the highest muzzle velocity at 2,694 fps; across all powders the maximum-charge window runs from 1,522 fps to 2,694 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 54–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:15.5 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 | 225gr | Sierra Pro-Hunter 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.