Load Specifications
Load data in caliber 8.5 x 63 with .338 | 220gr | Reichenberg HDB Universal 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 Hodgdon CFE223.
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>> | 90% | 54,621 psi | 88% | 2497 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,230 psi | 89% | 2589 fps | 99.2% |
| Accurate 2230 | <<locked>> | 82% | 55,883 psi | 90% | 2598 fps | 99.4% |
| Accurate 2460 | <<locked>> | 86% | 52,953 psi | 85% | 2520 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 54,737 psi | 88% | 2549 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 54,360 psi | 87% | 2575 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 54,302 psi | 87% | 2589 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 43,076 psi | 69% | 2490 fps | 96.9% |
| Accurate LT-30 | <<locked>> | 84% | 54,969 psi | 88% | 2451 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 55,434 psi | 89% | 2474 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 53,766 psi | 86% | 2582 fps | 99.5% |
| ADI AR 2208 | <<locked>> | 98% | 54,433 psi | 87% | 2572 fps | 99.2% |
| ADI AR 2219 | <<locked>> | 84% | 55,201 psi | 89% | 2559 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 53,055 psi | 85% | 2543 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 92% | 55,985 psi | 90% | 2562 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 54,433 psi | 87% | 2635 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 52,968 psi | 85% | 2677 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 53,563 psi | 86% | 2592 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 86% | 54,476 psi | 87% | 2503 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 54,346 psi | 87% | 2612 fps | 99.3% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 43,830 psi | 70% | 2500 fps | 97.1% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 50,488 psi | 81% | 2644 fps | 99.6% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 53,838 psi | 86% | 2451 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 53,417 psi | 86% | 2595 fps | 98.8% |
| Bofors RP3 | <<locked>> | 98% | 53,650 psi | 86% | 2605 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 90% | 55,317 psi | 89% | 2530 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 55,172 psi | 88% | 2615 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 53,330 psi | 86% | 2651 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 86% | 53,954 psi | 87% | 2546 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 54,926 psi | 88% | 2569 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 55,477 psi | 89% | 2615 fps | 98.5% |
| Hodgdon H4895 | <<locked>> | 92% | 54,201 psi | 87% | 2592 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,030 psi | 64% | 2398 fps | 97.7% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 56,231 psi | 90% | 2667 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,389 psi | 55% | 1522 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 55,608 psi | 89% | 2595 fps | 99.8% |
| IMR 3031 | <<locked>> | 92% | 53,214 psi | 85% | 2579 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 53,969 psi | 87% | 2559 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 94% | 54,998 psi | 88% | 2539 fps | 96.3% |
| IMR 4198 | <<locked>> | 86% | 55,216 psi | 89% | 2467 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 53,998 psi | 87% | 2556 fps | 96% |
| IMR 4831ᴾ | <<locked>> | 100% | 41,655 psi | 67% | 2448 fps | 96.6% |
| IMR 4895 | <<locked>> | 96% | 55,709 psi | 89% | 2641 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 90% | 53,055 psi | 85% | 2543 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 86% | 52,808 psi | 85% | 2530 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 55,840 psi | 90% | 2605 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 54,041 psi | 87% | 2516 fps | 99.5% |
| Lovex S062 | <<locked>> | 96% | 53,374 psi | 86% | 2559 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 49,066 psi | 79% | 2497 fps | 96.7% |
| Norma 200 | <<locked>> | 82% | 54,288 psi | 87% | 2477 fps | 100% |
| Norma 201 | <<locked>> | 94% | 55,448 psi | 89% | 2575 fps | 100% |
| Norma 202 | <<locked>> | 94% | 55,985 psi | 90% | 2582 fps | 100% |
| Norma 203B | <<locked>> | 96% | 53,403 psi | 86% | 2598 fps | 99.5% |
| Norma URPᴾ | <<locked>> | 100% | 43,700 psi | 70% | 2490 fps | 96.9% |
| Ramshot Big Game | <<locked>> | 96% | 53,940 psi | 86% | 2625 fps | 99.4% |
| Ramshot TAC | <<locked>> | 90% | 53,505 psi | 86% | 2552 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 92% | 56,304 psi | 90% | 2621 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 88% | 54,549 psi | 87% | 2546 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,693 psi | 56% | 1562 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 52,881 psi | 85% | 2530 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 52,939 psi | 85% | 2552 fps | 96.7% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 54,520 psi | 87% | 2674 fps | 99.3% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 54,027 psi | 87% | 2703 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 43,323 psi | 69% | 2510 fps | 96.5% |
| Rottweil R 901 | <<locked>> | 92% | 56,347 psi | 90% | 2559 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 55,927 psi | 90% | 2572 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 53,200 psi | 85% | 2592 fps | 99.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 49,066 psi | 79% | 2497 fps | 96.7% |
| Shooters World Match Rifle | <<locked>> | 94% | 55,840 psi | 90% | 2605 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 53,374 psi | 86% | 2559 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 56,391 psi | 90% | 2549 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,477 psi | 89% | 2224 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 55,709 psi | 89% | 2572 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 55,564 psi | 89% | 2654 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 55,999 psi | 90% | 2526 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 55,056 psi | 88% | 2579 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 55,608 psi | 89% | 2602 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 54,766 psi | 88% | 2487 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 54,012 psi | 87% | 2480 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 54,172 psi | 87% | 2575 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 53,461 psi | 86% | 2484 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 54,650 psi | 88% | 2575 fps | 99.5% |
| Somchem S355ᴾ | <<locked>> | 100% | 54,114 psi | 87% | 2595 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 38,740 psi | 62% | 2441 fps | 98.8% |
| Vihtavuori N120 | <<locked>> | 82% | 56,333 psi | 90% | 2418 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 54,534 psi | 87% | 2457 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 54,650 psi | 88% | 2474 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,056 psi | 88% | 2543 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 53,098 psi | 85% | 2520 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 52,315 psi | 84% | 2533 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 46,137 psi | 74% | 2493 fps | 97.3% |
| Vihtavuori N530 | <<locked>> | 90% | 53,679 psi | 86% | 2543 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 96% | 54,534 psi | 87% | 2559 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 45,165 psi | 72% | 2500 fps | 97% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,543 psi | 76% | 2487 fps | 99.1% |
| Winchester 748 | <<locked>> | 92% | 56,202 psi | 90% | 2631 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 55,042 psi | 88% | 2608 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% | 39,842 psi | 64% | 2290 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 51,547 psi | 83% | 2536 fps | 98.7% |
| Accurate 2230 | <<locked>> | 80% | 52,112 psi | 84% | 2546 fps | 99.1% |
| Accurate 2460 | <<locked>> | 80% | 43,192 psi | 69% | 2382 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 31,879 psi | 51% | 2198 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 38,464 psi | 62% | 2336 fps | 99.4% |
| Accurate 4064 | <<locked>> | 80% | 30,182 psi | 48% | 2182 fps | 98.5% |
| Accurate 4350 | <<locked>> | 96% | 37,318 psi | 60% | 2385 fps | 95.3% |
| Accurate LT-30 | <<locked>> | 80% | 48,631 psi | 78% | 2369 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,023 psi | 79% | 2388 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 36,622 psi | 59% | 2293 fps | 96.4% |
| ADI AR 2208 | <<locked>> | 84% | 35,491 psi | 57% | 2251 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 48,327 psi | 77% | 2470 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,696 psi | 62% | 2310 fps | 98.2% |
| Alliant AR-Comp | <<locked>> | 80% | 37,405 psi | 60% | 2313 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 44,715 psi | 72% | 2484 fps | 98.9% |
| Alliant Power Pro 2000-MR | 51.2 gr | 84% | 37,681 psi | 60% | 2398 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 29,878 psi | 48% | 2165 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 45,382 psi | 73% | 2379 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 34,679 psi | 56% | 2270 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 96% | 38,812 psi | 62% | 2402 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 88% | 33,808 psi | 54% | 2323 fps | 95.6% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 47,485 psi | 76% | 2365 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 37,971 psi | 61% | 2336 fps | 95.5% |
| Bofors RP3 | <<locked>> | 82% | 31,009 psi | 50% | 2208 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,843 psi | 65% | 2306 fps | 99% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,521 psi | 59% | 2320 fps | 98.3% |
| Hodgdon CFE223 | 49.9 gr | 80% | 40,176 psi | 64% | 2434 fps | 96.9% |
| Hodgdon H322 | <<locked>> | 80% | 44,048 psi | 71% | 2405 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 44,657 psi | 72% | 2425 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 39,827 psi | 64% | 2369 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 36,840 psi | 59% | 2303 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 33,185 psi | 53% | 2257 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,793 psi | 53% | 2264 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,367 psi | 41% | 1355 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,505 psi | 57% | 2260 fps | 96.6% |
| IMR 3031 | <<locked>> | 80% | 35,534 psi | 57% | 2306 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 34,911 psi | 56% | 2234 fps | 95.3% |
| IMR 4166 Enduron | <<locked>> | 92% | 51,779 psi | 83% | 2493 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 46,456 psi | 74% | 2352 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 50,575 psi | 81% | 2507 fps | 95.3% |
| IMR 4831 | <<locked>> | 96% | 36,434 psi | 58% | 2349 fps | 95% |
| IMR 4895 | <<locked>> | 80% | 33,272 psi | 53% | 2254 fps | 95.4% |
| IMR 8208 XBR | <<locked>> | 80% | 38,696 psi | 62% | 2310 fps | 98.2% |
| Lovex D073.5 | <<locked>> | 80% | 42,844 psi | 69% | 2382 fps | 99.5% |
| Lovex D073.6 | <<locked>> | 80% | 34,621 psi | 56% | 2270 fps | 98.7% |
| Lovex S060 | <<locked>> | 80% | 37,478 psi | 60% | 2244 fps | 96.7% |
| Lovex S062 | <<locked>> | 80% | 32,082 psi | 51% | 2188 fps | 96.4% |
| Lovex S065 | <<locked>> | 96% | 43,424 psi | 70% | 2405 fps | 95.3% |
| Norma 200 | <<locked>> | 80% | 50,995 psi | 82% | 2434 fps | 100% |
| Norma 201 | <<locked>> | 80% | 35,723 psi | 57% | 2251 fps | 97.5% |
| Norma 202 | <<locked>> | 80% | 35,752 psi | 57% | 2267 fps | 99.3% |
| Norma 203B | <<locked>> | 82% | 34,026 psi | 55% | 2260 fps | 95.6% |
| Norma URP | <<locked>> | 96% | 38,551 psi | 62% | 2395 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 82% | 33,634 psi | 54% | 2270 fps | 95% |
| Ramshot TAC | <<locked>> | 84% | 43,874 psi | 70% | 2402 fps | 95.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,449 psi | 60% | 2320 fps | 96.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,989 psi | 67% | 2352 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,527 psi | 41% | 1391 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 43,511 psi | 70% | 2392 fps | 99.7% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 46,383 psi | 74% | 2454 fps | 95.2% |
| ReloadSwiss RS 52 | 48.5 gr | 82% | 35,926 psi | 58% | 2359 fps | 95.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 27,717 psi | 44% | 2169 fps | 95.3% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 40,466 psi | 65% | 2461 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 39,262 psi | 63% | 2300 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 80% | 33,852 psi | 54% | 2205 fps | 97% |
| Rottweil R 903 | <<locked>> | 84% | 31,314 psi | 50% | 2208 fps | 95.4% |
| Shooters World Long Rifle | <<locked>> | 96% | 43,424 psi | 70% | 2405 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,621 psi | 56% | 2270 fps | 98.7% |
| Shooters World Precision | <<locked>> | 80% | 32,082 psi | 51% | 2188 fps | 96.4% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,035 psi | 74% | 2405 fps | 99.1% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 52,765 psi | 85% | 2192 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 48,544 psi | 78% | 2477 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 35,027 psi | 56% | 2306 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,224 psi | 74% | 2398 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 41,742 psi | 67% | 2375 fps | 95.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,215 psi | 56% | 2264 fps | 95.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,623 psi | 60% | 2228 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,734 psi | 49% | 2106 fps | 99% |
| Somchem S321 | <<locked>> | 80% | 41,307 psi | 66% | 2379 fps | 98.9% |
| Somchem S335 | <<locked>> | 80% | 37,014 psi | 59% | 2231 fps | 99.8% |
| Somchem S341 | <<locked>> | 80% | 36,100 psi | 58% | 2274 fps | 96.1% |
| Somchem S355 | <<locked>> | 84% | 32,460 psi | 52% | 2218 fps | 95.6% |
| Somchem S365 | <<locked>> | 92% | 30,066 psi | 48% | 2241 fps | 95.8% |
| Vihtavuori N120 | <<locked>> | 80% | 52,968 psi | 85% | 2379 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 42,830 psi | 69% | 2300 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,768 psi | 61% | 2231 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,837 psi | 53% | 2208 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 33,881 psi | 54% | 2211 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 82% | 28,892 psi | 46% | 2119 fps | 95.8% |
| Vihtavuori N160 | <<locked>> | 94% | 38,014 psi | 61% | 2349 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 38,464 psi | 62% | 2303 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 80% | 32,474 psi | 52% | 2198 fps | 98.6% |
| Vihtavuori N550 | <<locked>> | 96% | 39,407 psi | 63% | 2398 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 34,011 psi | 55% | 2238 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 37,246 psi | 60% | 2336 fps | 98.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 34,258 psi | 55% | 2264 fps | 96.3% |
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 97 powders for 8.5 x 63 loaded with the .338 | 220gr | Reichenberg HDB Universal. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,703 fps; across all powders the maximum-charge window runs from 1,522 fps to 2,703 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 55–90 %, leaving at least 10 % headroom. The 220.0 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, Hodgdon CFE223 rank at the top here: for 8.5 x 63 with the .338 | 220gr | Reichenberg HDB Universal 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.