Load Specifications
Load data in caliber 8.5 x 63 with .338 | 232gr | Lehigh Defense Controlled Fracturing 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, Hodgdon CFE223 and Ramshot Big Game.
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% | 54,824 psi | 88% | 2415 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,550 psi | 89% | 2510 fps | 99.4% |
| Accurate 2230 | <<locked>> | 82% | 56,304 psi | 90% | 2520 fps | 99.6% |
| Accurate 2460 | <<locked>> | 86% | 53,156 psi | 85% | 2441 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 54,868 psi | 88% | 2467 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 54,882 psi | 88% | 2497 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 54,549 psi | 87% | 2507 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 43,540 psi | 70% | 2421 fps | 97.4% |
| Accurate LT-30 | <<locked>> | 84% | 55,405 psi | 89% | 2372 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 55,840 psi | 90% | 2395 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 54,012 psi | 87% | 2503 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 98% | 54,882 psi | 88% | 2497 fps | 99.4% |
| ADI AR 2219 | <<locked>> | 84% | 55,782 psi | 89% | 2480 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 53,461 psi | 86% | 2464 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 53,069 psi | 85% | 2444 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 54,969 psi | 88% | 2556 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 53,476 psi | 86% | 2602 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 53,867 psi | 86% | 2513 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 86% | 54,955 psi | 88% | 2425 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 54,897 psi | 88% | 2533 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,077 psi | 71% | 2428 fps | 97.6% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 50,923 psi | 82% | 2569 fps | 99.7% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,215 psi | 87% | 2372 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 53,505 psi | 86% | 2513 fps | 99% |
| Bofors RP3 | <<locked>> | 98% | 54,099 psi | 87% | 2530 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 90% | 55,622 psi | 89% | 2451 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 55,492 psi | 89% | 2536 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 53,606 psi | 86% | 2572 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 86% | 54,157 psi | 87% | 2461 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 55,172 psi | 88% | 2487 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 56,028 psi | 90% | 2539 fps | 98.8% |
| Hodgdon H4895 | <<locked>> | 92% | 54,462 psi | 87% | 2513 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,263 psi | 65% | 2329 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 56,420 psi | 90% | 2582 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,519 psi | 55% | 1470 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 55,985 psi | 90% | 2513 fps | 99.9% |
| IMR 3031 | <<locked>> | 92% | 53,664 psi | 86% | 2500 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 54,302 psi | 87% | 2480 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,434 psi | 89% | 2464 fps | 96.7% |
| IMR 4198 | <<locked>> | 86% | 55,738 psi | 89% | 2388 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 54,070 psi | 87% | 2477 fps | 96.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 41,800 psi | 67% | 2372 fps | 97% |
| IMR 4895 | <<locked>> | 96% | 56,231 psi | 90% | 2562 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 90% | 53,461 psi | 86% | 2464 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 53,084 psi | 85% | 2451 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 52,620 psi | 84% | 2480 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 54,418 psi | 87% | 2441 fps | 99.7% |
| Lovex S062 | <<locked>> | 96% | 53,432 psi | 86% | 2477 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 49,327 psi | 79% | 2425 fps | 97.1% |
| Norma 200 | <<locked>> | 82% | 54,694 psi | 88% | 2398 fps | 100% |
| Norma 201 | <<locked>> | 94% | 56,043 psi | 90% | 2497 fps | 100% |
| Norma 202 | <<locked>> | 94% | 56,275 psi | 90% | 2500 fps | 100% |
| Norma 203B | <<locked>> | 96% | 53,983 psi | 87% | 2523 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 44,077 psi | 71% | 2421 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 96% | 54,273 psi | 87% | 2546 fps | 99.6% |
| Ramshot TAC | <<locked>> | 90% | 54,056 psi | 87% | 2480 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 92% | 56,391 psi | 90% | 2539 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 88% | 54,636 psi | 88% | 2467 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,621 psi | 56% | 1499 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 53,185 psi | 85% | 2451 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 53,113 psi | 85% | 2474 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 54,882 psi | 88% | 2595 fps | 99.5% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 54,549 psi | 87% | 2625 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 43,511 psi | 70% | 2438 fps | 97% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 45,092 psi | 72% | 2457 fps | 96.4% |
| Rottweil R 901 | <<locked>> | 90% | 53,505 psi | 86% | 2438 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 56,231 psi | 90% | 2493 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 53,693 psi | 86% | 2513 fps | 99.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 49,327 psi | 79% | 2425 fps | 97.1% |
| Shooters World Match Rifle | <<locked>> | 92% | 52,620 psi | 84% | 2480 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 53,432 psi | 86% | 2477 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,142 psi | 85% | 2425 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,912 psi | 90% | 2149 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 55,796 psi | 89% | 2490 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 55,970 psi | 90% | 2575 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 56,188 psi | 90% | 2444 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 55,463 psi | 89% | 2503 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 55,898 psi | 90% | 2523 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 54,969 psi | 88% | 2405 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 54,302 psi | 87% | 2402 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 54,621 psi | 88% | 2500 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 53,896 psi | 86% | 2405 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 54,752 psi | 88% | 2493 fps | 99.6% |
| Somchem S355ᴾ | <<locked>> | 100% | 54,476 psi | 87% | 2516 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,059 psi | 63% | 2372 fps | 99.1% |
| Vihtavuori N130 | <<locked>> | 88% | 54,824 psi | 88% | 2375 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 54,926 psi | 88% | 2395 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,259 psi | 89% | 2461 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 53,432 psi | 86% | 2441 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 52,707 psi | 85% | 2457 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 46,572 psi | 75% | 2421 fps | 97.7% |
| Vihtavuori N530 | <<locked>> | 90% | 53,896 psi | 86% | 2464 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 54,897 psi | 88% | 2480 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 45,455 psi | 73% | 2425 fps | 97.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,848 psi | 77% | 2415 fps | 99.4% |
| Winchester 748 | <<locked>> | 90% | 52,982 psi | 85% | 2503 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 55,448 psi | 89% | 2533 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% | 40,234 psi | 65% | 2221 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 51,706 psi | 83% | 2454 fps | 99% |
| Accurate 2230 | <<locked>> | 80% | 52,373 psi | 84% | 2467 fps | 99.3% |
| Accurate 2460 | <<locked>> | 80% | 43,526 psi | 70% | 2306 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 32,111 psi | 51% | 2133 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 38,798 psi | 62% | 2264 fps | 99.6% |
| Accurate 4064 | <<locked>> | 80% | 30,400 psi | 49% | 2116 fps | 98.9% |
| Accurate 4350 | <<locked>> | 94% | 35,157 psi | 56% | 2270 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 48,791 psi | 78% | 2290 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,168 psi | 79% | 2310 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 36,898 psi | 59% | 2224 fps | 96.9% |
| ADI AR 2208 | <<locked>> | 84% | 35,621 psi | 57% | 2185 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 48,631 psi | 78% | 2392 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,986 psi | 63% | 2241 fps | 98.5% |
| Alliant AR-Comp | <<locked>> | 80% | 37,666 psi | 60% | 2238 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,078 psi | 72% | 2411 fps | 99.1% |
| Alliant Power Pro 2000-MR | 49.3 gr | 84% | 37,985 psi | 61% | 2333 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,110 psi | 48% | 2103 fps | 95.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 45,745 psi | 73% | 2306 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 35,070 psi | 56% | 2208 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 94% | 36,724 psi | 59% | 2287 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 86% | 31,937 psi | 51% | 2208 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 47,616 psi | 76% | 2290 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 35,694 psi | 57% | 2218 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 29,225 psi | 47% | 2096 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,089 psi | 66% | 2238 fps | 99.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,666 psi | 59% | 2247 fps | 98.6% |
| Hodgdon CFE223 | 48 gr | 80% | 40,437 psi | 65% | 2362 fps | 97.3% |
| Hodgdon H322 | <<locked>> | 80% | 44,440 psi | 71% | 2329 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,078 psi | 72% | 2352 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 37,420 psi | 60% | 2247 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 37,173 psi | 60% | 2234 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 31,256 psi | 50% | 2142 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,025 psi | 53% | 2198 fps | 96.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,382 psi | 41% | 1306 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,795 psi | 57% | 2195 fps | 97.1% |
| IMR 3031 | <<locked>> | 80% | 35,998 psi | 58% | 2238 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 32,953 psi | 53% | 2123 fps | 95% |
| IMR 4166 Enduron | <<locked>> | 90% | 48,921 psi | 78% | 2372 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 46,615 psi | 75% | 2274 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 47,761 psi | 77% | 2385 fps | 95% |
| IMR 4831 | <<locked>> | 96% | 36,637 psi | 59% | 2277 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 33,591 psi | 54% | 2188 fps | 95.9% |
| IMR 8208 XBR | <<locked>> | 80% | 38,986 psi | 63% | 2241 fps | 98.5% |
| Lovex D073.5 | <<locked>> | 80% | 43,250 psi | 69% | 2310 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 34,882 psi | 56% | 2205 fps | 99% |
| Lovex S060 | <<locked>> | 80% | 37,869 psi | 61% | 2182 fps | 97.1% |
| Lovex S062 | <<locked>> | 80% | 32,474 psi | 52% | 2126 fps | 97% |
| Lovex S065 | <<locked>> | 94% | 41,060 psi | 66% | 2290 fps | 95% |
| Norma 200 | <<locked>> | 80% | 51,271 psi | 82% | 2356 fps | 100% |
| Norma 201 | <<locked>> | 80% | 35,940 psi | 58% | 2185 fps | 97.9% |
| Norma 202 | <<locked>> | 80% | 35,998 psi | 58% | 2198 fps | 99.5% |
| Norma 203B | <<locked>> | 80% | 32,213 psi | 52% | 2152 fps | 95.4% |
| Norma URP | <<locked>> | 94% | 36,274 psi | 58% | 2277 fps | 95% |
| Ramshot Big Game | 48.1 gr | 82% | 33,866 psi | 54% | 2205 fps | 95.6% |
| Ramshot TAC | <<locked>> | 82% | 41,423 psi | 66% | 2283 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,797 psi | 61% | 2251 fps | 97.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,061 psi | 67% | 2277 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,556 psi | 41% | 1339 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 43,700 psi | 70% | 2316 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 46,557 psi | 75% | 2379 fps | 95.6% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 33,721 psi | 54% | 2238 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 27,920 psi | 45% | 2113 fps | 96% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 37,985 psi | 61% | 2336 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 42,061 psi | 67% | 2402 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 39,653 psi | 64% | 2231 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 34,229 psi | 55% | 2142 fps | 97.4% |
| Rottweil R 903 | <<locked>> | 82% | 29,501 psi | 47% | 2100 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 94% | 41,060 psi | 66% | 2290 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,882 psi | 56% | 2205 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 32,474 psi | 52% | 2126 fps | 97% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,180 psi | 74% | 2326 fps | 99.3% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,069 psi | 85% | 2119 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 48,979 psi | 79% | 2402 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 33,141 psi | 53% | 2192 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,630 psi | 75% | 2323 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 39,218 psi | 63% | 2254 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,404 psi | 57% | 2195 fps | 96.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,956 psi | 61% | 2162 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,995 psi | 50% | 2044 fps | 99.3% |
| Somchem S321 | <<locked>> | 80% | 41,481 psi | 67% | 2303 fps | 99.2% |
| Somchem S335 | <<locked>> | 80% | 37,217 psi | 60% | 2162 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 36,289 psi | 58% | 2208 fps | 96.6% |
| Somchem S355 | <<locked>> | 82% | 30,763 psi | 49% | 2110 fps | 95.4% |
| Somchem S365 | <<locked>> | 90% | 28,355 psi | 45% | 2129 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 43,163 psi | 69% | 2224 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,101 psi | 61% | 2162 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 33,185 psi | 53% | 2139 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,156 psi | 55% | 2146 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 80% | 27,267 psi | 44% | 2014 fps | 95.5% |
| Vihtavuori N160 | <<locked>> | 94% | 38,305 psi | 61% | 2280 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 38,609 psi | 62% | 2231 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 80% | 32,648 psi | 52% | 2129 fps | 98.9% |
| Vihtavuori N550 | <<locked>> | 94% | 37,260 psi | 60% | 2283 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 32,155 psi | 52% | 2129 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 37,536 psi | 60% | 2267 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 80% | 34,534 psi | 55% | 2198 fps | 96.8% |
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 | 232gr | Lehigh Defense Controlled Fracturing. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,625 fps; across all powders the maximum-charge window runs from 1,470 fps to 2,625 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 232.0 gr projectile in 0.338" calls for a 1:13.0 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, Ramshot Big Game rank at the top here: for 8.5 x 63 with the .338 | 232gr | Lehigh Defense Controlled Fracturing 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.