Load Specifications
Load data in caliber 8.5 x 63 with .338 | 225gr | Nosler AccuBond bullet and 96 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, Hodgdon CFE223 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.
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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% | 55,840 psi | 90% | 2467 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 56,057 psi | 90% | 2556 fps | 99.3% |
| Accurate 2460 | <<locked>> | 86% | 54,157 psi | 87% | 2490 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 56,159 psi | 90% | 2520 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 55,651 psi | 89% | 2546 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 55,666 psi | 89% | 2556 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 44,295 psi | 71% | 2467 fps | 97.3% |
| Accurate LT-30 | <<locked>> | 84% | 55,883 psi | 90% | 2418 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 56,275 psi | 90% | 2441 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 54,708 psi | 88% | 2549 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 98% | 55,390 psi | 89% | 2543 fps | 99.3% |
| ADI AR 2219 | <<locked>> | 84% | 56,159 psi | 90% | 2526 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 53,853 psi | 86% | 2510 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 90% | 53,548 psi | 86% | 2490 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 55,550 psi | 89% | 2602 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 53,795 psi | 86% | 2644 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 54,433 psi | 87% | 2562 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,709 psi | 89% | 2474 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 55,506 psi | 89% | 2582 fps | 99.4% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,817 psi | 72% | 2477 fps | 97.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 51,547 psi | 83% | 2618 fps | 99.7% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,781 psi | 88% | 2418 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,215 psi | 87% | 2562 fps | 99% |
| Bofors RP3 | <<locked>> | 98% | 54,810 psi | 88% | 2575 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 90% | 56,304 psi | 90% | 2497 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 56,072 psi | 90% | 2582 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,418 psi | 87% | 2621 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 86% | 54,882 psi | 88% | 2513 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 55,825 psi | 90% | 2536 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 53,113 psi | 85% | 2539 fps | 98.3% |
| Hodgdon H4895 | <<locked>> | 92% | 55,143 psi | 88% | 2559 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,872 psi | 66% | 2372 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 53,374 psi | 86% | 2585 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,505 psi | 55% | 1493 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 53,142 psi | 85% | 2516 fps | 99.7% |
| IMR 3031 | <<locked>> | 92% | 54,099 psi | 87% | 2546 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 54,940 psi | 88% | 2526 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,912 psi | 90% | 2510 fps | 96.6% |
| IMR 4198 | <<locked>> | 86% | 55,985 psi | 90% | 2431 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 54,752 psi | 88% | 2523 fps | 96.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 42,685 psi | 68% | 2425 fps | 97% |
| IMR 4895 | <<locked>> | 94% | 53,461 psi | 86% | 2566 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 90% | 53,853 psi | 86% | 2510 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 86% | 54,012 psi | 87% | 2500 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 53,374 psi | 86% | 2526 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 55,071 psi | 88% | 2487 fps | 99.6% |
| Lovex S062 | <<locked>> | 96% | 54,186 psi | 87% | 2523 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 50,009 psi | 80% | 2467 fps | 96.9% |
| Norma 200 | <<locked>> | 82% | 55,738 psi | 89% | 2448 fps | 100% |
| Norma 201 | <<locked>> | 92% | 53,243 psi | 85% | 2500 fps | 99.9% |
| Norma 202 | <<locked>> | 92% | 53,592 psi | 86% | 2507 fps | 100% |
| Norma 203B | <<locked>> | 96% | 54,563 psi | 87% | 2569 fps | 99.6% |
| Norma URPᴾ | <<locked>> | 100% | 44,599 psi | 72% | 2464 fps | 97.2% |
| Ramshot Big Game | <<locked>> | 96% | 54,955 psi | 88% | 2595 fps | 99.6% |
| Ramshot TAC | <<locked>> | 90% | 54,549 psi | 87% | 2523 fps | 97.9% |
| Ramshot Wild Boar | <<locked>> | 90% | 53,519 psi | 86% | 2543 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 88% | 55,230 psi | 89% | 2513 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,896 psi | 56% | 1532 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 53,925 psi | 86% | 2500 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 53,882 psi | 86% | 2523 fps | 96.9% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 55,332 psi | 89% | 2641 fps | 99.5% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 55,129 psi | 88% | 2674 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 44,280 psi | 71% | 2487 fps | 96.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 45,687 psi | 73% | 2503 fps | 96.2% |
| Rottweil R 901 | <<locked>> | 90% | 54,447 psi | 87% | 2487 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 53,693 psi | 86% | 2497 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 54,375 psi | 87% | 2562 fps | 99.8% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 50,009 psi | 80% | 2467 fps | 96.9% |
| Shooters World Match Rifle | <<locked>> | 92% | 53,374 psi | 86% | 2526 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 54,186 psi | 87% | 2523 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,853 psi | 86% | 2470 fps | 99.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 56,115 psi | 90% | 2188 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 52,939 psi | 85% | 2493 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 52,895 psi | 85% | 2575 fps | 99.4% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 53,243 psi | 85% | 2448 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 56,072 psi | 90% | 2549 fps | 98.5% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 56,391 psi | 90% | 2569 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,782 psi | 89% | 2454 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 54,882 psi | 88% | 2448 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 55,245 psi | 89% | 2546 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 54,447 psi | 87% | 2451 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 55,521 psi | 89% | 2543 fps | 99.6% |
| Somchem S355ᴾ | <<locked>> | 100% | 55,100 psi | 88% | 2562 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,711 psi | 64% | 2418 fps | 99% |
| Vihtavuori N130 | <<locked>> | 88% | 55,738 psi | 89% | 2428 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,637 psi | 89% | 2441 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 56,072 psi | 90% | 2510 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 54,056 psi | 87% | 2487 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 53,272 psi | 85% | 2503 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 47,050 psi | 75% | 2464 fps | 97.5% |
| Vihtavuori N530 | <<locked>> | 90% | 54,607 psi | 88% | 2510 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 55,767 psi | 89% | 2530 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 46,195 psi | 74% | 2474 fps | 97.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 48,399 psi | 78% | 2457 fps | 99.3% |
| Winchester 748 | <<locked>> | 90% | 53,534 psi | 86% | 2552 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 55,869 psi | 90% | 2575 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% | 41,002 psi | 66% | 2264 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 52,315 psi | 84% | 2503 fps | 98.9% |
| Accurate 2460 | <<locked>> | 80% | 44,396 psi | 71% | 2356 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 33,504 psi | 54% | 2188 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 39,624 psi | 64% | 2313 fps | 99.6% |
| Accurate 4064 | <<locked>> | 80% | 31,691 psi | 51% | 2172 fps | 98.9% |
| Accurate 4350 | <<locked>> | 94% | 36,085 psi | 58% | 2320 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 49,385 psi | 79% | 2336 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,777 psi | 80% | 2356 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 37,681 psi | 60% | 2270 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 84% | 36,260 psi | 58% | 2228 fps | 95.5% |
| ADI AR 2219 | <<locked>> | 80% | 49,197 psi | 79% | 2438 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,682 psi | 64% | 2283 fps | 98.4% |
| Alliant AR-Comp | <<locked>> | 80% | 38,479 psi | 62% | 2287 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,861 psi | 74% | 2461 fps | 99.1% |
| Alliant Power Pro 2000-MR | 50.1 gr | 84% | 38,682 psi | 62% | 2379 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,951 psi | 50% | 2152 fps | 95.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,383 psi | 74% | 2349 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 35,824 psi | 57% | 2254 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 94% | 37,420 psi | 60% | 2333 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 86% | 32,706 psi | 52% | 2254 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,298 psi | 77% | 2336 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 36,477 psi | 58% | 2267 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 30,168 psi | 48% | 2149 fps | 95.5% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,771 psi | 67% | 2283 fps | 99.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 37,594 psi | 60% | 2297 fps | 98.5% |
| Hodgdon CFE223 | 48.8 gr | 80% | 41,205 psi | 66% | 2411 fps | 97.2% |
| Hodgdon H322 | <<locked>> | 80% | 45,078 psi | 72% | 2379 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,658 psi | 73% | 2398 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 40,843 psi | 65% | 2343 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 37,971 psi | 61% | 2283 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 32,053 psi | 51% | 2192 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,707 psi | 54% | 2241 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,759 psi | 41% | 1335 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,477 psi | 58% | 2238 fps | 97% |
| IMR 3031 | <<locked>> | 80% | 36,608 psi | 59% | 2283 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,708 psi | 57% | 2211 fps | 95.7% |
| IMR 4166 Enduron | <<locked>> | 90% | 49,342 psi | 79% | 2415 fps | 95.2% |
| IMR 4198 | <<locked>> | 80% | 47,065 psi | 75% | 2320 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 51,576 psi | 83% | 2480 fps | 95.6% |
| IMR 4831 | <<locked>> | 96% | 37,594 psi | 60% | 2329 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 34,374 psi | 55% | 2234 fps | 95.9% |
| IMR 8208 XBR | <<locked>> | 80% | 39,682 psi | 64% | 2283 fps | 98.4% |
| Lovex D073.5 | <<locked>> | 80% | 44,121 psi | 71% | 2359 fps | 99.6% |
| Lovex D073.6 | <<locked>> | 80% | 35,781 psi | 57% | 2251 fps | 99% |
| Lovex S060 | <<locked>> | 80% | 38,377 psi | 62% | 2221 fps | 97% |
| Lovex S062 | <<locked>> | 80% | 33,185 psi | 53% | 2172 fps | 96.9% |
| Lovex S065 | <<locked>> | 96% | 44,280 psi | 71% | 2379 fps | 95.6% |
| Norma 200 | <<locked>> | 80% | 52,373 psi | 84% | 2408 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,927 psi | 59% | 2234 fps | 97.9% |
| Norma 202 | <<locked>> | 80% | 36,840 psi | 59% | 2244 fps | 99.5% |
| Norma 203B | <<locked>> | 80% | 33,054 psi | 53% | 2198 fps | 95.3% |
| Norma URP | <<locked>> | 96% | 39,363 psi | 63% | 2369 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 82% | 34,679 psi | 56% | 2251 fps | 95.5% |
| Ramshot TAC | <<locked>> | 82% | 42,177 psi | 68% | 2329 fps | 95.2% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,421 psi | 62% | 2297 fps | 97% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,917 psi | 69% | 2326 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,005 psi | 42% | 1368 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,353 psi | 71% | 2362 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 47,166 psi | 76% | 2421 fps | 95.5% |
| ReloadSwiss RS 52 | 46.2 gr | 80% | 34,447 psi | 55% | 2283 fps | 95.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,616 psi | 46% | 2159 fps | 96% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 38,841 psi | 62% | 2385 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 42,757 psi | 69% | 2448 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 40,625 psi | 65% | 2280 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 35,027 psi | 56% | 2188 fps | 97.4% |
| Rottweil R 903 | <<locked>> | 82% | 30,429 psi | 49% | 2149 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 96% | 44,280 psi | 71% | 2379 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,781 psi | 57% | 2251 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 33,185 psi | 53% | 2172 fps | 96.9% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,978 psi | 75% | 2375 fps | 99.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,374 psi | 86% | 2159 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,559 psi | 79% | 2448 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 33,750 psi | 54% | 2238 fps | 95.3% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,108 psi | 76% | 2365 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 39,943 psi | 64% | 2300 fps | 95.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,100 psi | 58% | 2241 fps | 96.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,566 psi | 62% | 2205 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,604 psi | 51% | 2087 fps | 99.2% |
| Somchem S321 | <<locked>> | 80% | 42,409 psi | 68% | 2356 fps | 99.1% |
| Somchem S335 | <<locked>> | 80% | 38,087 psi | 61% | 2211 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 37,101 psi | 59% | 2254 fps | 96.5% |
| Somchem S355 | <<locked>> | 82% | 31,618 psi | 51% | 2159 fps | 95.4% |
| Somchem S365 | <<locked>> | 90% | 29,225 psi | 47% | 2178 fps | 95.5% |
| Vihtavuori N130 | <<locked>> | 80% | 43,743 psi | 70% | 2270 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,653 psi | 62% | 2205 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 33,881 psi | 54% | 2185 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,925 psi | 56% | 2192 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 80% | 28,123 psi | 45% | 2060 fps | 95.5% |
| Vihtavuori N160 | <<locked>> | 94% | 39,030 psi | 63% | 2326 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 39,334 psi | 63% | 2277 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 80% | 33,417 psi | 54% | 2178 fps | 98.8% |
| Vihtavuori N550 | <<locked>> | 94% | 37,956 psi | 61% | 2326 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 32,822 psi | 53% | 2172 fps | 95.4% |
| Winchester 748 | <<locked>> | 80% | 38,203 psi | 61% | 2313 fps | 98.9% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,215 psi | 56% | 2244 fps | 96.7% |
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 96 powders for 8.5 x 63 loaded with the .338 | 225gr | Nosler AccuBond. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,674 fps; across all powders the maximum-charge window runs from 1,493 fps to 2,674 fps. Accurate 4350 gives the best case fill at 100 %, and 96 of the 96 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 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, Hodgdon CFE223, ReloadSwiss RS 52 rank at the top here: for 8.5 x 63 with the .338 | 225gr | Nosler AccuBond 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.