Load Specifications
Load data in caliber 8.5 x 63 with .338 | 210gr | Swift Scirocco bullet and 98 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 LEVERevolution.
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% | 53,780 psi | 86% | 2539 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 53,911 psi | 86% | 2618 fps | 98.6% |
| Accurate 2230 | <<locked>> | 82% | 54,839 psi | 88% | 2631 fps | 99% |
| Accurate 2460 | <<locked>> | 88% | 55,753 psi | 89% | 2608 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 53,708 psi | 86% | 2592 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 53,359 psi | 86% | 2615 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 53,200 psi | 85% | 2625 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 42,134 psi | 68% | 2516 fps | 96% |
| Accurate LT-30 | <<locked>> | 84% | 54,056 psi | 87% | 2490 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 54,476 psi | 87% | 2513 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 55,999 psi | 90% | 2664 fps | 99.4% |
| ADI AR 2207 | <<locked>> | 82% | 55,579 psi | 89% | 2510 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 53,417 psi | 86% | 2605 fps | 98.6% |
| ADI AR 2219 | <<locked>> | 84% | 54,114 psi | 87% | 2602 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 55,303 psi | 89% | 2621 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 92% | 54,650 psi | 88% | 2605 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 53,359 psi | 86% | 2671 fps | 99.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 55,477 psi | 89% | 2762 fps | 98.9% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 55,811 psi | 89% | 2674 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 86% | 53,650 psi | 86% | 2546 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 53,316 psi | 85% | 2644 fps | 98.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 43,105 psi | 69% | 2530 fps | 96.1% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 49,458 psi | 79% | 2674 fps | 99.1% |
| Alliant Reloder-7 | <<locked>> | 82% | 56,434 psi | 90% | 2526 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 56,260 psi | 90% | 2530 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 55,550 psi | 89% | 2674 fps | 98.6% |
| Bofors RP3ᴾ | <<locked>> | 100% | 56,043 psi | 90% | 2687 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 54,433 psi | 87% | 2566 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 92% | 54,085 psi | 87% | 2654 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 90% | 55,709 psi | 89% | 2736 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 88% | 56,260 psi | 90% | 2628 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 53,824 psi | 86% | 2608 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 54,476 psi | 87% | 2648 fps | 97.9% |
| Hodgdon H4198 | <<locked>> | 82% | 55,985 psi | 90% | 2533 fps | 100% |
| Hodgdon H4895 | <<locked>> | 92% | 52,924 psi | 85% | 2625 fps | 99.4% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 39,204 psi | 63% | 2421 fps | 96.8% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 54,592 psi | 88% | 2697 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,389 psi | 55% | 1555 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 54,505 psi | 87% | 2628 fps | 99.5% |
| IMR 3031 | <<locked>> | 94% | 55,492 psi | 89% | 2664 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 56,246 psi | 90% | 2638 fps | 99.1% |
| IMR 4198 | <<locked>> | 86% | 54,462 psi | 87% | 2513 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 54,621 psi | 88% | 2677 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 92% | 55,303 psi | 89% | 2621 fps | 99.8% |
| Lovex D073.4 | <<locked>> | 82% | 55,622 psi | 89% | 2615 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 55,622 psi | 89% | 2615 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 54,766 psi | 88% | 2641 fps | 100% |
| Lovex S060 | <<locked>> | 94% | 56,391 psi | 90% | 2598 fps | 99.4% |
| Lovex S062 | <<locked>> | 98% | 55,405 psi | 89% | 2638 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 48,269 psi | 77% | 2530 fps | 95.8% |
| Norma 200 | <<locked>> | 82% | 53,650 psi | 86% | 2520 fps | 100% |
| Norma 201 | <<locked>> | 94% | 54,607 psi | 88% | 2612 fps | 99.8% |
| Norma 202 | <<locked>> | 94% | 54,926 psi | 88% | 2621 fps | 100% |
| Norma 203B | <<locked>> | 98% | 55,970 psi | 90% | 2684 fps | 99.4% |
| Norma URPᴾ | <<locked>> | 100% | 42,902 psi | 69% | 2520 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 98% | 56,420 psi | 90% | 2707 fps | 99.3% |
| Ramshot TAC | <<locked>> | 92% | 56,014 psi | 90% | 2635 fps | 97.5% |
| Ramshot Wild Boar | <<locked>> | 92% | 54,897 psi | 88% | 2654 fps | 99.3% |
| Ramshot X-Terminator | <<locked>> | 88% | 53,374 psi | 86% | 2579 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,708 psi | 56% | 1594 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 55,187 psi | 88% | 2612 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 55,230 psi | 89% | 2631 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 52,808 psi | 85% | 2703 fps | 98.8% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 52,910 psi | 85% | 2736 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 55,738 psi | 89% | 2602 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 54,752 psi | 88% | 2605 fps | 99.8% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 52,214 psi | 84% | 2628 fps | 99.4% |
| Shooters World AR Plus | <<locked>> | 82% | 55,622 psi | 89% | 2615 fps | 100% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 48,269 psi | 77% | 2530 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 94% | 54,766 psi | 88% | 2641 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 55,405 psi | 89% | 2638 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 55,434 psi | 89% | 2585 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,042 psi | 88% | 2267 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 54,694 psi | 88% | 2612 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 54,012 psi | 87% | 2684 fps | 99.2% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 54,578 psi | 88% | 2562 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 53,737 psi | 86% | 2605 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 54,215 psi | 87% | 2635 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 53,853 psi | 86% | 2523 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 56,434 psi | 90% | 2559 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 53,200 psi | 85% | 2612 fps | 99.8% |
| Somchem S335 | <<locked>> | 94% | 55,898 psi | 90% | 2562 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 53,229 psi | 85% | 2605 fps | 99% |
| Somchem S355ᴾ | <<locked>> | 100% | 53,084 psi | 85% | 2628 fps | 99.4% |
| Somchem S365ᴾ | <<locked>> | 100% | 38,116 psi | 61% | 2467 fps | 98% |
| Vihtavuori N120 | <<locked>> | 82% | 55,434 psi | 89% | 2461 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 53,693 psi | 86% | 2497 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 53,679 psi | 86% | 2513 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 53,650 psi | 86% | 2582 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 55,317 psi | 89% | 2598 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 51,242 psi | 82% | 2569 fps | 99.8% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 45,252 psi | 73% | 2520 fps | 96.4% |
| Vihtavuori N530 | <<locked>> | 92% | 56,101 psi | 90% | 2625 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 96% | 53,534 psi | 86% | 2598 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 43,990 psi | 71% | 2523 fps | 96% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 46,528 psi | 75% | 2513 fps | 98.5% |
| Winchester 748 | <<locked>> | 92% | 54,969 psi | 88% | 2667 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 53,867 psi | 86% | 2644 fps | 99.5% |
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% | 39,421 psi | 63% | 2329 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 50,618 psi | 81% | 2569 fps | 98.1% |
| Accurate 2230 | <<locked>> | 80% | 51,256 psi | 82% | 2582 fps | 98.5% |
| Accurate 2460 | <<locked>> | 80% | 42,714 psi | 68% | 2418 fps | 99.7% |
| Accurate 2495 | <<locked>> | 80% | 31,879 psi | 51% | 2241 fps | 99.8% |
| Accurate 2520 | <<locked>> | 80% | 37,985 psi | 61% | 2369 fps | 99% |
| Accurate 4064 | <<locked>> | 80% | 30,182 psi | 48% | 2221 fps | 98% |
| Accurate 4350 | <<locked>> | 98% | 39,392 psi | 63% | 2467 fps | 95.2% |
| Accurate LT-30 | <<locked>> | 80% | 47,906 psi | 77% | 2405 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 48,254 psi | 77% | 2425 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 36,172 psi | 58% | 2323 fps | 95.6% |
| ADI AR 2207 | <<locked>> | 80% | 52,228 psi | 84% | 2467 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 37,173 psi | 60% | 2326 fps | 95% |
| ADI AR 2219 | <<locked>> | 80% | 47,413 psi | 76% | 2507 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,174 psi | 61% | 2339 fps | 97.5% |
| Alliant AR-Comp | <<locked>> | 80% | 36,695 psi | 59% | 2349 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 43,888 psi | 70% | 2516 fps | 98.3% |
| Alliant Power Pro 2000-MR | 52.2 gr | 86% | 39,682 psi | 64% | 2480 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 31,662 psi | 51% | 2247 fps | 95.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 44,759 psi | 72% | 2421 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 36,608 psi | 59% | 2352 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 98% | 40,625 psi | 65% | 2477 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 90% | 35,650 psi | 57% | 2402 fps | 95.5% |
| Alliant Reloder-7 | <<locked>> | 80% | 53,127 psi | 85% | 2484 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 46,731 psi | 75% | 2405 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 39,900 psi | 64% | 2418 fps | 95.4% |
| Bofors RP3 | <<locked>> | 84% | 32,967 psi | 53% | 2293 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,321 psi | 65% | 2343 fps | 98.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,027 psi | 58% | 2352 fps | 97.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 39,465 psi | 63% | 2464 fps | 96% |
| Hodgdon H322 | <<locked>> | 80% | 43,294 psi | 69% | 2441 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 43,932 psi | 70% | 2461 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 41,771 psi | 67% | 2444 fps | 95.1% |
| Hodgdon H4198 | <<locked>> | 80% | 52,707 psi | 85% | 2490 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 36,405 psi | 58% | 2333 fps | 96.3% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 34,650 psi | 56% | 2326 fps | 95.2% |
| Hodgdon LEVERevolution | 47.6 gr | 80% | 32,401 psi | 52% | 2293 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,599 psi | 41% | 1388 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,027 psi | 56% | 2290 fps | 95.7% |
| IMR 3031 | <<locked>> | 80% | 35,143 psi | 56% | 2346 fps | 99.8% |
| IMR 4064 | <<locked>> | 84% | 36,680 psi | 59% | 2310 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 45,629 psi | 73% | 2392 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 35,012 psi | 56% | 2333 fps | 95.3% |
| IMR 8208 XBR | <<locked>> | 80% | 38,174 psi | 61% | 2339 fps | 97.5% |
| Lovex D073.4 | <<locked>> | 80% | 51,953 psi | 83% | 2566 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 42,366 psi | 68% | 2418 fps | 99.1% |
| Lovex D073.6 | <<locked>> | 80% | 34,258 psi | 55% | 2306 fps | 98.2% |
| Lovex S060 | <<locked>> | 80% | 37,231 psi | 60% | 2280 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 32,024 psi | 51% | 2224 fps | 95.7% |
| Lovex S065 | <<locked>> | 98% | 45,194 psi | 72% | 2477 fps | 95% |
| Norma 200 | <<locked>> | 80% | 50,502 psi | 81% | 2480 fps | 100% |
| Norma 201 | <<locked>> | 80% | 35,476 psi | 57% | 2287 fps | 96.9% |
| Norma 202 | <<locked>> | 80% | 35,288 psi | 57% | 2300 fps | 98.9% |
| Norma 203B | <<locked>> | 84% | 35,940 psi | 58% | 2343 fps | 95.6% |
| Norma URP | <<locked>> | 98% | 40,118 psi | 64% | 2467 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 86% | 37,855 psi | 61% | 2402 fps | 95.8% |
| Ramshot TAC | <<locked>> | 86% | 46,093 psi | 74% | 2480 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 36,912 psi | 59% | 2349 fps | 95.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,437 psi | 66% | 2382 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,773 psi | 41% | 1424 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 42,844 psi | 69% | 2425 fps | 99.4% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 51,721 psi | 83% | 2579 fps | 95.7% |
| ReloadSwiss RS 52 | 49.4 gr | 84% | 37,652 psi | 60% | 2434 fps | 95.4% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 29,370 psi | 47% | 2251 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 39,160 psi | 63% | 2339 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 80% | 33,866 psi | 54% | 2244 fps | 96.3% |
| Rottweil R 903 | <<locked>> | 86% | 33,098 psi | 53% | 2290 fps | 95.4% |
| Shooters World AR Plus | <<locked>> | 80% | 51,953 psi | 83% | 2566 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 98% | 45,194 psi | 72% | 2477 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,258 psi | 55% | 2306 fps | 98.2% |
| Shooters World Precision | <<locked>> | 80% | 32,024 psi | 51% | 2224 fps | 95.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 45,324 psi | 73% | 2438 fps | 98.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 52,083 psi | 84% | 2234 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 47,776 psi | 77% | 2513 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 36,912 psi | 59% | 2388 fps | 95.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,382 psi | 73% | 2434 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 43,990 psi | 71% | 2454 fps | 95.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,751 psi | 56% | 2293 fps | 95% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,231 psi | 60% | 2264 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,414 psi | 49% | 2139 fps | 98.5% |
| Somchem S321 | <<locked>> | 80% | 40,756 psi | 65% | 2411 fps | 98.4% |
| Somchem S335 | <<locked>> | 80% | 36,695 psi | 59% | 2267 fps | 99.5% |
| Somchem S341 | <<locked>> | 80% | 35,578 psi | 57% | 2306 fps | 95.2% |
| Somchem S355 | <<locked>> | 86% | 34,229 psi | 55% | 2297 fps | 95.5% |
| Somchem S365 | <<locked>> | 94% | 31,633 psi | 51% | 2316 fps | 95.7% |
| Vihtavuori N120 | <<locked>> | 80% | 52,083 psi | 84% | 2421 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 42,279 psi | 68% | 2336 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,275 psi | 60% | 2267 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,416 psi | 52% | 2241 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 80% | 33,446 psi | 54% | 2244 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 84% | 30,647 psi | 49% | 2198 fps | 95.8% |
| Vihtavuori N160 | <<locked>> | 98% | 42,525 psi | 68% | 2474 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 38,000 psi | 61% | 2336 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 80% | 32,126 psi | 52% | 2231 fps | 98% |
| Vihtavuori N550 | <<locked>> | 98% | 41,423 psi | 66% | 2477 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 35,839 psi | 57% | 2313 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 36,637 psi | 59% | 2369 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,794 psi | 54% | 2293 fps | 95.4% |
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 98 powders for 8.5 x 63 loaded with the .338 | 210gr | Swift Scirocco. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,762 fps; across all powders the maximum-charge window runs from 1,555 fps to 2,762 fps. Accurate 4350 gives the best case fill at 100 %, and 98 of the 98 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 210.0 gr projectile in 0.338" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 4350, Alliant Reloder- TS 15.5, Alliant Reloder-16 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 LEVERevolution rank at the top here: for 8.5 x 63 with the .338 | 210gr | Swift Scirocco 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.