Load Specifications
Load data in caliber 8.5 x 63 with .338 | 225gr | Hornady InterBond bullet and 97 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.
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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% | 53,534 psi | 86% | 2448 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 55,347 psi | 89% | 2516 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 54,273 psi | 87% | 2507 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 53,461 psi | 86% | 2530 fps | 100% |
| Accurate 4064 | <<locked>> | 96% | 53,809 psi | 86% | 2543 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,847 psi | 74% | 2500 fps | 97.8% |
| Accurate LT-30 | <<locked>> | 82% | 53,272 psi | 85% | 2398 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 53,679 psi | 86% | 2418 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 55,840 psi | 90% | 2575 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 96% | 53,403 psi | 86% | 2526 fps | 99.2% |
| ADI AR 2219 | <<locked>> | 82% | 53,809 psi | 86% | 2507 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,274 psi | 89% | 2536 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 55,042 psi | 88% | 2516 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 53,272 psi | 85% | 2582 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 55,303 psi | 89% | 2680 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 55,796 psi | 89% | 2589 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 53,519 psi | 86% | 2454 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 53,548 psi | 86% | 2566 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,919 psi | 74% | 2510 fps | 97.9% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 52,881 psi | 85% | 2648 fps | 99.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 55,825 psi | 90% | 2441 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 55,477 psi | 89% | 2592 fps | 99.2% |
| Bofors RP3 | <<locked>> | 96% | 52,765 psi | 85% | 2559 fps | 99.9% |
| Bofors RP7ᴾ | <<locked>> | 100% | 53,708 psi | 86% | 2520 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 88% | 54,215 psi | 87% | 2480 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 53,824 psi | 86% | 2562 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 55,883 psi | 90% | 2654 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 86% | 55,970 psi | 90% | 2536 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 53,403 psi | 86% | 2516 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 54,360 psi | 87% | 2569 fps | 98.6% |
| Hodgdon H4895 | <<locked>> | 92% | 56,304 psi | 90% | 2589 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,989 psi | 67% | 2405 fps | 98.4% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 55,042 psi | 88% | 2618 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,737 psi | 56% | 1509 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 54,244 psi | 87% | 2543 fps | 99.8% |
| IMR 3031 | <<locked>> | 92% | 55,506 psi | 89% | 2569 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 56,289 psi | 90% | 2556 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 92% | 53,621 psi | 86% | 2490 fps | 96.4% |
| IMR 4198 | <<locked>> | 84% | 54,114 psi | 87% | 2418 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 55,898 psi | 90% | 2552 fps | 96.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 43,859 psi | 70% | 2454 fps | 97.4% |
| IMR 4895 | <<locked>> | 94% | 54,926 psi | 88% | 2595 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 90% | 55,274 psi | 89% | 2536 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 55,535 psi | 89% | 2530 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 54,882 psi | 88% | 2556 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 56,130 psi | 90% | 2513 fps | 99.7% |
| Lovex S062 | <<locked>> | 96% | 55,579 psi | 89% | 2552 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,445 psi | 82% | 2500 fps | 97.4% |
| Norma 201 | <<locked>> | 92% | 54,723 psi | 88% | 2530 fps | 100% |
| Norma 202 | <<locked>> | 92% | 55,071 psi | 88% | 2536 fps | 100% |
| Norma 203B | <<locked>> | 96% | 55,927 psi | 90% | 2598 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 46,050 psi | 74% | 2500 fps | 97.7% |
| Ramshot Big Game | <<locked>> | 94% | 52,881 psi | 85% | 2579 fps | 99.5% |
| Ramshot TAC | <<locked>> | 90% | 55,709 psi | 89% | 2552 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 90% | 54,810 psi | 88% | 2569 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 86% | 53,069 psi | 85% | 2493 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,128 psi | 56% | 1545 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 54,853 psi | 88% | 2523 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 55,042 psi | 88% | 2552 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 53,113 psi | 85% | 2621 fps | 99.3% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 52,881 psi | 85% | 2654 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,527 psi | 73% | 2520 fps | 97.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 46,775 psi | 75% | 2536 fps | 96.8% |
| Rottweil R 901 | <<locked>> | 90% | 55,796 psi | 89% | 2513 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 54,882 psi | 88% | 2523 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 56,101 psi | 90% | 2595 fps | 99.9% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 53,708 psi | 86% | 2520 fps | 95.7% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,445 psi | 82% | 2500 fps | 97.4% |
| Shooters World Match Rifle | <<locked>> | 92% | 54,882 psi | 88% | 2556 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,579 psi | 89% | 2552 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 54,969 psi | 88% | 2500 fps | 99.9% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 54,172 psi | 87% | 2520 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 54,447 psi | 87% | 2605 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 54,418 psi | 87% | 2474 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 53,621 psi | 86% | 2526 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 54,114 psi | 87% | 2549 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 53,621 psi | 86% | 2438 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 56,304 psi | 90% | 2470 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 51,561 psi | 83% | 2454 fps | 95.9% |
| Somchem S321 | <<locked>> | 86% | 52,837 psi | 85% | 2523 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 55,869 psi | 90% | 2477 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 53,171 psi | 85% | 2526 fps | 99.5% |
| Somchem S355 | <<locked>> | 98% | 53,156 psi | 85% | 2546 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,959 psi | 66% | 2454 fps | 99.4% |
| Vihtavuori N130 | <<locked>> | 86% | 53,447 psi | 86% | 2408 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 53,563 psi | 86% | 2428 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 53,911 psi | 86% | 2493 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 55,492 psi | 89% | 2513 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 54,824 psi | 88% | 2533 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,486 psi | 78% | 2500 fps | 98% |
| Vihtavuori N530 | <<locked>> | 90% | 55,709 psi | 89% | 2536 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 53,476 psi | 86% | 2510 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,282 psi | 76% | 2500 fps | 97.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,690 psi | 80% | 2490 fps | 99.5% |
| Winchester 748 | <<locked>> | 90% | 55,027 psi | 88% | 2582 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 49,821 psi | 80% | 2556 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 92% | 53,853 psi | 86% | 2559 fps | 99.8% |
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% | 41,814 psi | 67% | 2287 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 45,411 psi | 73% | 2379 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 34,330 psi | 55% | 2208 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,611 psi | 65% | 2339 fps | 99.7% |
| Accurate 4064 | <<locked>> | 80% | 32,503 psi | 52% | 2195 fps | 99.2% |
| Accurate 4350 | <<locked>> | 94% | 37,318 psi | 60% | 2352 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 50,154 psi | 80% | 2356 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,546 psi | 81% | 2375 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,406 psi | 62% | 2293 fps | 97.2% |
| ADI AR 2208 | <<locked>> | 82% | 34,882 psi | 56% | 2208 fps | 95.2% |
| ADI AR 2219 | <<locked>> | 80% | 50,285 psi | 81% | 2461 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,379 psi | 65% | 2306 fps | 98.7% |
| Alliant AR-Comp | <<locked>> | 80% | 39,450 psi | 63% | 2310 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 46,731 psi | 75% | 2484 fps | 99.3% |
| Alliant Power Pro 2000-MR | 50 gr | 82% | 36,898 psi | 59% | 2349 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,836 psi | 51% | 2182 fps | 96.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,297 psi | 76% | 2372 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,301 psi | 55% | 2231 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 94% | 38,406 psi | 62% | 2365 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 86% | 33,475 psi | 54% | 2287 fps | 95.8% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,110 psi | 79% | 2359 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,231 psi | 60% | 2290 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 31,038 psi | 50% | 2175 fps | 96% |
| Bofors RP7 | <<locked>> | 98% | 50,517 psi | 81% | 2474 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,467 psi | 68% | 2306 fps | 99.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,464 psi | 62% | 2323 fps | 98.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 42,322 psi | 68% | 2441 fps | 97.7% |
| Hodgdon H322 | <<locked>> | 80% | 46,151 psi | 74% | 2405 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,862 psi | 75% | 2425 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 39,131 psi | 63% | 2323 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 38,653 psi | 62% | 2306 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 32,851 psi | 53% | 2221 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,650 psi | 56% | 2274 fps | 97.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,715 psi | 41% | 1342 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,318 psi | 60% | 2267 fps | 97.4% |
| IMR 3031 | <<locked>> | 80% | 37,710 psi | 60% | 2313 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,374 psi | 55% | 2192 fps | 95.4% |
| IMR 4166 Enduron | <<locked>> | 88% | 47,413 psi | 76% | 2395 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 48,037 psi | 77% | 2343 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 49,443 psi | 79% | 2461 fps | 95.4% |
| IMR 4831 | <<locked>> | 94% | 36,216 psi | 58% | 2310 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 35,085 psi | 56% | 2260 fps | 96.3% |
| IMR 8208 XBR | <<locked>> | 80% | 40,379 psi | 65% | 2306 fps | 98.7% |
| Lovex D073.5 | <<locked>> | 80% | 45,281 psi | 73% | 2385 fps | 99.8% |
| Lovex D073.6 | <<locked>> | 80% | 36,738 psi | 59% | 2277 fps | 99.2% |
| Lovex S060 | <<locked>> | 80% | 39,233 psi | 63% | 2247 fps | 97.4% |
| Lovex S062 | <<locked>> | 80% | 34,069 psi | 55% | 2198 fps | 97.3% |
| Lovex S065 | <<locked>> | 94% | 42,830 psi | 69% | 2365 fps | 95.4% |
| Norma 201 | <<locked>> | 80% | 37,666 psi | 60% | 2257 fps | 98.2% |
| Norma 202 | <<locked>> | 80% | 37,768 psi | 61% | 2270 fps | 99.7% |
| Norma 203B | <<locked>> | 80% | 33,707 psi | 54% | 2221 fps | 95.8% |
| Norma URP | <<locked>> | 94% | 38,087 psi | 61% | 2356 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 33,127 psi | 53% | 2228 fps | 95.1% |
| Ramshot TAC | <<locked>> | 82% | 43,120 psi | 69% | 2356 fps | 95.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,436 psi | 63% | 2326 fps | 97.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,743 psi | 70% | 2352 fps | 98.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,947 psi | 42% | 1375 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,310 psi | 73% | 2385 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 45,324 psi | 73% | 2405 fps | 95.2% |
| ReloadSwiss RS 52 | 47.3 gr | 80% | 35,288 psi | 57% | 2313 fps | 95.6% |
| ReloadSwiss RS 60 | 48.1 gr | 80% | 29,399 psi | 47% | 2188 fps | 96.6% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 37,289 psi | 60% | 2365 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 41,075 psi | 66% | 2428 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 41,452 psi | 66% | 2303 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 80% | 35,955 psi | 58% | 2218 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 82% | 31,285 psi | 50% | 2175 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 98% | 50,517 psi | 81% | 2474 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 94% | 42,830 psi | 69% | 2365 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,738 psi | 59% | 2277 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 34,069 psi | 55% | 2198 fps | 97.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,892 psi | 77% | 2402 fps | 99.5% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,778 psi | 81% | 2474 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 32,474 psi | 52% | 2218 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,022 psi | 77% | 2388 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 38,319 psi | 61% | 2280 fps | 95% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,927 psi | 59% | 2267 fps | 96.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,334 psi | 63% | 2228 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,285 psi | 52% | 2106 fps | 99.4% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 48,356 psi | 78% | 2411 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 43,265 psi | 69% | 2379 fps | 99.3% |
| Somchem S335 | <<locked>> | 80% | 38,783 psi | 62% | 2231 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 37,884 psi | 61% | 2280 fps | 96.9% |
| Somchem S355 | <<locked>> | 80% | 30,371 psi | 49% | 2136 fps | 95% |
| Somchem S365 | <<locked>> | 88% | 28,079 psi | 45% | 2159 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 44,570 psi | 71% | 2290 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,436 psi | 63% | 2228 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,737 psi | 56% | 2208 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,607 psi | 57% | 2215 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 80% | 28,747 psi | 46% | 2083 fps | 96% |
| Vihtavuori N160 | <<locked>> | 92% | 37,536 psi | 60% | 2310 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 40,263 psi | 65% | 2303 fps | 98.8% |
| Vihtavuori N540 | <<locked>> | 80% | 34,214 psi | 55% | 2201 fps | 99.1% |
| Vihtavuori N550 | <<locked>> | 94% | 39,015 psi | 63% | 2359 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 31,401 psi | 50% | 2149 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 39,349 psi | 63% | 2343 fps | 99.2% |
| Winchester 760 | <<locked>> | 98% | 46,659 psi | 75% | 2503 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,042 psi | 58% | 2267 fps | 97.2% |
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 97 powders for 8.5 x 63 loaded with the .338 | 225gr | Hornady InterBond. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,680 fps; across all powders the maximum-charge window runs from 1,509 fps to 2,680 fps. Accurate 4350 gives the best case fill at 100 %, and 97 of the 97 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:13.5 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 | 225gr | Hornady InterBond 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.