Load Specifications
Load data in caliber 8.5 x 63 with .338 | 225gr | Frontier PH HPBT bullet and 95 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% | 55,796 psi | 89% | 2467 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,970 psi | 90% | 2556 fps | 99.3% |
| Accurate 2460 | <<locked>> | 86% | 54,360 psi | 87% | 2497 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 52,910 psi | 85% | 2484 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 55,898 psi | 90% | 2552 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 55,927 psi | 90% | 2562 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 44,498 psi | 71% | 2474 fps | 97.4% |
| Accurate LT-30 | <<locked>> | 84% | 55,796 psi | 89% | 2421 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 56,275 psi | 90% | 2441 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 54,911 psi | 88% | 2556 fps | 99.6% |
| ADI AR 2208 | <<locked>> | 98% | 55,608 psi | 89% | 2546 fps | 99.3% |
| ADI AR 2219 | <<locked>> | 82% | 52,707 psi | 85% | 2487 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 54,099 psi | 87% | 2513 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 90% | 53,838 psi | 86% | 2497 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 55,796 psi | 89% | 2612 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 53,983 psi | 87% | 2651 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 54,650 psi | 88% | 2566 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,985 psi | 90% | 2477 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 55,738 psi | 89% | 2589 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,991 psi | 72% | 2484 fps | 97.5% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 51,735 psi | 83% | 2621 fps | 99.7% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,723 psi | 88% | 2421 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,418 psi | 87% | 2569 fps | 99% |
| Bofors RP3 | <<locked>> | 98% | 55,027 psi | 88% | 2582 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 88% | 53,301 psi | 85% | 2461 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 56,304 psi | 90% | 2589 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,665 psi | 88% | 2628 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 86% | 54,853 psi | 88% | 2513 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 56,086 psi | 90% | 2543 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 53,330 psi | 86% | 2546 fps | 98.3% |
| Hodgdon H4895 | <<locked>> | 92% | 55,390 psi | 89% | 2566 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,046 psi | 66% | 2379 fps | 98.1% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 53,592 psi | 86% | 2589 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,592 psi | 55% | 1499 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 53,388 psi | 86% | 2523 fps | 99.7% |
| IMR 3031 | <<locked>> | 92% | 54,360 psi | 87% | 2549 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 55,100 psi | 88% | 2533 fps | 99.4% |
| IMR 4166 Enduron | <<locked>> | 94% | 56,130 psi | 90% | 2516 fps | 96.6% |
| IMR 4198 | <<locked>> | 86% | 56,304 psi | 90% | 2438 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 54,940 psi | 88% | 2530 fps | 96.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 42,873 psi | 69% | 2428 fps | 97% |
| IMR 4895 | <<locked>> | 94% | 53,708 psi | 86% | 2572 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 90% | 54,099 psi | 87% | 2513 fps | 99.9% |
| Lovex D073.5 | <<locked>> | 86% | 54,273 psi | 87% | 2507 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 53,621 psi | 86% | 2533 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 55,013 psi | 88% | 2490 fps | 99.6% |
| Lovex S062 | <<locked>> | 96% | 54,433 psi | 87% | 2530 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 50,212 psi | 81% | 2474 fps | 97% |
| Norma 200 | <<locked>> | 82% | 55,724 psi | 89% | 2451 fps | 100% |
| Norma 201 | <<locked>> | 92% | 53,432 psi | 86% | 2507 fps | 99.9% |
| Norma 202 | <<locked>> | 92% | 53,853 psi | 86% | 2513 fps | 100% |
| Norma 203B | <<locked>> | 96% | 54,781 psi | 88% | 2575 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 44,788 psi | 72% | 2470 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 96% | 55,143 psi | 88% | 2602 fps | 99.6% |
| Ramshot TAC | <<locked>> | 90% | 54,752 psi | 88% | 2530 fps | 98% |
| Ramshot Wild Boar | <<locked>> | 90% | 53,737 psi | 86% | 2546 fps | 99.5% |
| Ramshot X-Terminator | <<locked>> | 88% | 55,463 psi | 89% | 2516 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,983 psi | 56% | 1535 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 53,882 psi | 86% | 2503 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 54,070 psi | 87% | 2530 fps | 97% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 55,593 psi | 89% | 2648 fps | 99.5% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 55,288 psi | 89% | 2677 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 44,425 psi | 71% | 2493 fps | 97% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 45,876 psi | 74% | 2510 fps | 96.3% |
| Rottweil R 901 | <<locked>> | 90% | 54,708 psi | 88% | 2493 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 53,954 psi | 87% | 2503 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 54,607 psi | 88% | 2569 fps | 99.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 50,212 psi | 81% | 2474 fps | 97% |
| Shooters World Match Rifle | <<locked>> | 92% | 53,621 psi | 86% | 2533 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 54,433 psi | 87% | 2530 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,780 psi | 86% | 2474 fps | 99.8% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 53,171 psi | 85% | 2500 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 53,127 psi | 85% | 2579 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 53,519 psi | 86% | 2454 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 56,275 psi | 90% | 2552 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 53,026 psi | 85% | 2526 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,738 psi | 89% | 2454 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 55,129 psi | 88% | 2451 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 55,477 psi | 89% | 2549 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 54,665 psi | 88% | 2454 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 55,724 psi | 89% | 2549 fps | 99.6% |
| Somchem S355ᴾ | <<locked>> | 100% | 55,317 psi | 89% | 2569 fps | 99.8% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,871 psi | 64% | 2425 fps | 99.1% |
| Vihtavuori N130 | <<locked>> | 88% | 55,709 psi | 89% | 2428 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,593 psi | 89% | 2444 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 56,362 psi | 90% | 2516 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 54,302 psi | 87% | 2493 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 53,476 psi | 86% | 2507 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 47,239 psi | 76% | 2470 fps | 97.6% |
| Vihtavuori N530 | <<locked>> | 90% | 54,781 psi | 88% | 2516 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 55,985 psi | 90% | 2536 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 46,354 psi | 74% | 2477 fps | 97.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 48,501 psi | 78% | 2464 fps | 99.3% |
| Winchester 748 | <<locked>> | 90% | 53,780 psi | 86% | 2559 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 56,086 psi | 90% | 2582 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% | 41,220 psi | 66% | 2270 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 52,562 psi | 84% | 2510 fps | 98.9% |
| Accurate 2460 | <<locked>> | 80% | 44,643 psi | 72% | 2362 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 33,518 psi | 54% | 2192 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 39,842 psi | 64% | 2320 fps | 99.6% |
| Accurate 4064 | <<locked>> | 80% | 31,734 psi | 51% | 2175 fps | 99% |
| Accurate 4350 | <<locked>> | 94% | 36,303 psi | 58% | 2326 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 49,632 psi | 80% | 2343 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,024 psi | 80% | 2362 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 37,695 psi | 60% | 2274 fps | 96.9% |
| ADI AR 2208 | <<locked>> | 84% | 36,477 psi | 58% | 2234 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 49,443 psi | 79% | 2444 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,682 psi | 64% | 2287 fps | 98.5% |
| Alliant AR-Comp | <<locked>> | 80% | 38,783 psi | 62% | 2293 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,803 psi | 73% | 2461 fps | 99.1% |
| Alliant Power Pro 2000-MR | 50.2 gr | 84% | 38,638 psi | 62% | 2382 fps | 95.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,154 psi | 50% | 2159 fps | 95.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,630 psi | 75% | 2356 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 35,810 psi | 57% | 2257 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 94% | 37,536 psi | 60% | 2339 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 86% | 32,663 psi | 52% | 2257 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,269 psi | 77% | 2339 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 36,448 psi | 58% | 2267 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 30,342 psi | 49% | 2156 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,771 psi | 67% | 2287 fps | 99.2% |
| Hodgdon BL-C2 | <<locked>> | 80% | 37,579 psi | 60% | 2300 fps | 98.6% |
| Hodgdon CFE223 | 49 gr | 80% | 41,408 psi | 66% | 2418 fps | 97.3% |
| Hodgdon H322 | <<locked>> | 80% | 45,353 psi | 73% | 2385 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,890 psi | 74% | 2405 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 38,348 psi | 61% | 2300 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 37,913 psi | 61% | 2283 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 32,227 psi | 52% | 2198 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,895 psi | 54% | 2251 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,657 psi | 41% | 1335 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,651 psi | 59% | 2244 fps | 97.1% |
| IMR 3031 | <<locked>> | 80% | 36,869 psi | 59% | 2290 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 33,692 psi | 54% | 2172 fps | 95% |
| IMR 4166 Enduron | <<locked>> | 90% | 49,501 psi | 79% | 2421 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 47,355 psi | 76% | 2326 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 48,762 psi | 78% | 2438 fps | 95% |
| IMR 4831 | <<locked>> | 96% | 37,521 psi | 60% | 2329 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 34,374 psi | 55% | 2238 fps | 95.9% |
| IMR 8208 XBR | <<locked>> | 80% | 39,682 psi | 64% | 2287 fps | 98.5% |
| Lovex D073.5 | <<locked>> | 80% | 44,324 psi | 71% | 2365 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 35,998 psi | 58% | 2257 fps | 99.1% |
| Lovex S060 | <<locked>> | 80% | 38,566 psi | 62% | 2228 fps | 97.1% |
| Lovex S062 | <<locked>> | 80% | 33,373 psi | 54% | 2178 fps | 97% |
| Lovex S065 | <<locked>> | 94% | 41,843 psi | 67% | 2339 fps | 95% |
| Norma 200 | <<locked>> | 80% | 52,373 psi | 84% | 2408 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,956 psi | 59% | 2238 fps | 98% |
| Norma 202 | <<locked>> | 80% | 37,028 psi | 59% | 2251 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 33,054 psi | 53% | 2201 fps | 95.4% |
| Norma URP | <<locked>> | 94% | 37,202 psi | 60% | 2329 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 82% | 34,650 psi | 56% | 2254 fps | 95.6% |
| Ramshot TAC | <<locked>> | 82% | 42,134 psi | 68% | 2333 fps | 95.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,595 psi | 62% | 2303 fps | 97% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,902 psi | 69% | 2329 fps | 97.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,875 psi | 41% | 1368 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,570 psi | 71% | 2365 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 47,355 psi | 76% | 2428 fps | 95.6% |
| ReloadSwiss RS 52 | 46.4 gr | 80% | 34,664 psi | 56% | 2290 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,761 psi | 46% | 2165 fps | 96.1% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 39,001 psi | 63% | 2392 fps | 95.4% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 42,917 psi | 69% | 2454 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 40,843 psi | 65% | 2287 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 35,230 psi | 56% | 2195 fps | 97.5% |
| Rottweil R 903 | <<locked>> | 82% | 30,472 psi | 49% | 2152 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 41,843 psi | 67% | 2339 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,998 psi | 58% | 2257 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 33,373 psi | 54% | 2178 fps | 97% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,949 psi | 75% | 2379 fps | 99.3% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,763 psi | 80% | 2454 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 33,953 psi | 54% | 2244 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,355 psi | 76% | 2372 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 40,118 psi | 64% | 2303 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,274 psi | 58% | 2247 fps | 96.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,769 psi | 62% | 2211 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,792 psi | 51% | 2093 fps | 99.3% |
| Somchem S321 | <<locked>> | 80% | 42,380 psi | 68% | 2356 fps | 99.2% |
| Somchem S335 | <<locked>> | 80% | 38,087 psi | 61% | 2211 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 37,072 psi | 59% | 2257 fps | 96.5% |
| Somchem S355 | <<locked>> | 82% | 31,662 psi | 51% | 2162 fps | 95.4% |
| Somchem S365 | <<locked>> | 90% | 29,341 psi | 47% | 2185 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 43,990 psi | 71% | 2277 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,856 psi | 62% | 2211 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,156 psi | 55% | 2192 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,925 psi | 56% | 2195 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 80% | 28,123 psi | 45% | 2064 fps | 95.6% |
| Vihtavuori N160 | <<locked>> | 94% | 39,218 psi | 63% | 2333 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 39,581 psi | 63% | 2283 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 80% | 33,620 psi | 54% | 2185 fps | 98.9% |
| Vihtavuori N550 | <<locked>> | 94% | 38,130 psi | 61% | 2333 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 32,953 psi | 53% | 2178 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 38,406 psi | 62% | 2320 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,418 psi | 57% | 2251 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 95 powders for 8.5 x 63 loaded with the .338 | 225gr | Frontier PH HPBT. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,677 fps; across all powders the maximum-charge window runs from 1,499 fps to 2,677 fps. Accurate 4350 gives the best case fill at 100 %, and 95 of the 95 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 1:12.5 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 | Frontier PH HPBT 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.