Load Specifications
Load data in caliber 8.5 x 63 with .338 | 200gr | NorthFork Bonded Core bullet and 94 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% | 55,550 psi | 89% | 2654 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,564 psi | 89% | 2743 fps | 98.8% |
| Accurate 2460 | <<locked>> | 86% | 54,056 psi | 87% | 2680 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 56,130 psi | 90% | 2713 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 55,463 psi | 89% | 2736 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 55,680 psi | 89% | 2749 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 44,222 psi | 71% | 2641 fps | 96.5% |
| Accurate LT-30 | <<locked>> | 84% | 55,535 psi | 89% | 2605 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 55,927 psi | 90% | 2628 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 54,418 psi | 87% | 2736 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 98% | 55,201 psi | 89% | 2726 fps | 98.9% |
| ADI AR 2219 | <<locked>> | 84% | 56,072 psi | 90% | 2720 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 53,867 psi | 86% | 2697 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 90% | 53,374 psi | 86% | 2684 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 55,230 psi | 89% | 2795 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 53,722 psi | 86% | 2835 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 54,360 psi | 87% | 2749 fps | 99.7% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,361 psi | 89% | 2661 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 55,434 psi | 89% | 2772 fps | 99.1% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,628 psi | 72% | 2651 fps | 96.6% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 51,401 psi | 82% | 2802 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,476 psi | 87% | 2602 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,070 psi | 87% | 2746 fps | 98.5% |
| Bofors RP3 | <<locked>> | 98% | 54,868 psi | 88% | 2766 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 55,956 psi | 90% | 2684 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 56,072 psi | 90% | 2776 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,027 psi | 87% | 2808 fps | 99% |
| Hodgdon H322 | <<locked>> | 86% | 54,636 psi | 88% | 2703 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 55,535 psi | 89% | 2726 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 52,779 psi | 85% | 2720 fps | 97.7% |
| Hodgdon H4895 | <<locked>> | 92% | 54,853 psi | 88% | 2746 fps | 99.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,741 psi | 65% | 2539 fps | 97.2% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 53,316 psi | 85% | 2772 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,548 psi | 55% | 1627 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 52,939 psi | 85% | 2700 fps | 99.4% |
| IMR 3031 | <<locked>> | 92% | 53,940 psi | 86% | 2736 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 54,737 psi | 88% | 2713 fps | 99% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,796 psi | 89% | 2694 fps | 95.8% |
| IMR 4198 | <<locked>> | 86% | 55,898 psi | 90% | 2625 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 42,467 psi | 68% | 2592 fps | 96.1% |
| IMR 4895 | <<locked>> | 94% | 53,200 psi | 85% | 2753 fps | 99.2% |
| IMR 8208 XBR | <<locked>> | 90% | 53,867 psi | 86% | 2697 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 86% | 53,983 psi | 87% | 2687 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 53,229 psi | 85% | 2717 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 54,853 psi | 88% | 2674 fps | 99.3% |
| Lovex S062 | <<locked>> | 96% | 54,244 psi | 87% | 2717 fps | 99.8% |
| Lovex S065ᴾ | <<locked>> | 100% | 50,009 psi | 80% | 2648 fps | 96.2% |
| Norma 200 | <<locked>> | 82% | 55,477 psi | 89% | 2638 fps | 100% |
| Norma 201 | <<locked>> | 92% | 53,229 psi | 85% | 2687 fps | 99.7% |
| Norma 202 | <<locked>> | 92% | 53,490 psi | 86% | 2694 fps | 100% |
| Norma 203B | <<locked>> | 96% | 54,520 psi | 87% | 2759 fps | 99.3% |
| Norma URPᴾ | <<locked>> | 100% | 44,715 psi | 72% | 2641 fps | 96.4% |
| Ramshot Big Game | <<locked>> | 96% | 54,824 psi | 88% | 2782 fps | 99.2% |
| Ramshot TAC | <<locked>> | 90% | 54,346 psi | 87% | 2703 fps | 97.3% |
| Ramshot Wild Boar | <<locked>> | 90% | 53,490 psi | 86% | 2726 fps | 99.1% |
| Ramshot X-Terminator | <<locked>> | 88% | 55,259 psi | 89% | 2700 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,853 psi | 56% | 1667 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 53,722 psi | 86% | 2687 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 53,548 psi | 86% | 2700 fps | 96.1% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 55,100 psi | 88% | 2831 fps | 99% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 54,897 psi | 88% | 2864 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 44,309 psi | 71% | 2661 fps | 96% |
| Rottweil R 901 | <<locked>> | 90% | 54,288 psi | 87% | 2677 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 53,592 psi | 86% | 2684 fps | 99.7% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 54,476 psi | 87% | 2753 fps | 99.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 50,009 psi | 80% | 2648 fps | 96.2% |
| Shooters World Match Rifle | <<locked>> | 92% | 53,229 psi | 85% | 2717 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 54,244 psi | 87% | 2717 fps | 99.8% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,621 psi | 86% | 2657 fps | 99.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,898 psi | 90% | 2369 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 56,318 psi | 90% | 2730 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 56,347 psi | 90% | 2812 fps | 99.4% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 53,069 psi | 85% | 2638 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 55,912 psi | 90% | 2733 fps | 98% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 56,173 psi | 90% | 2756 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,405 psi | 89% | 2638 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 54,824 psi | 88% | 2631 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 55,114 psi | 88% | 2733 fps | 99.9% |
| Somchem S335 | <<locked>> | 92% | 54,447 psi | 87% | 2638 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 55,317 psi | 89% | 2730 fps | 99.2% |
| Somchem S355ᴾ | <<locked>> | 100% | 55,085 psi | 88% | 2753 fps | 99.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,711 psi | 64% | 2589 fps | 98.4% |
| Vihtavuori N130 | <<locked>> | 88% | 55,274 psi | 89% | 2612 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,245 psi | 89% | 2628 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,941 psi | 90% | 2703 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 53,911 psi | 86% | 2674 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 53,374 psi | 86% | 2690 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 47,021 psi | 75% | 2641 fps | 96.8% |
| Vihtavuori N530 | <<locked>> | 90% | 54,389 psi | 87% | 2697 fps | 99.8% |
| Vihtavuori N540 | <<locked>> | 96% | 55,376 psi | 89% | 2713 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 46,093 psi | 74% | 2648 fps | 96.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 48,385 psi | 78% | 2635 fps | 98.9% |
| Winchester 748 | <<locked>> | 90% | 53,505 psi | 86% | 2743 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 55,999 psi | 90% | 2769 fps | 99.7% |
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% | 40,770 psi | 65% | 2438 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 52,185 psi | 84% | 2690 fps | 98.4% |
| Accurate 2460 | <<locked>> | 80% | 44,222 psi | 71% | 2530 fps | 99.8% |
| Accurate 2495 | <<locked>> | 80% | 33,301 psi | 53% | 2346 fps | 99.9% |
| Accurate 2520 | <<locked>> | 80% | 39,363 psi | 63% | 2480 fps | 99.1% |
| Accurate 4064 | <<locked>> | 80% | 31,488 psi | 50% | 2326 fps | 98.3% |
| Accurate 4350 | <<locked>> | 98% | 41,321 psi | 66% | 2589 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 49,110 psi | 79% | 2516 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,487 psi | 79% | 2536 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 37,333 psi | 60% | 2431 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 86% | 38,450 psi | 62% | 2438 fps | 95.4% |
| ADI AR 2219 | <<locked>> | 80% | 48,892 psi | 78% | 2621 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,291 psi | 63% | 2448 fps | 97.7% |
| Alliant AR-Comp | <<locked>> | 80% | 38,116 psi | 61% | 2457 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,339 psi | 73% | 2635 fps | 98.5% |
| Alliant Power Pro 2000-MR | 56.3 gr | 86% | 41,162 psi | 66% | 2602 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 32,750 psi | 53% | 2352 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,267 psi | 74% | 2533 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 37,913 psi | 61% | 2464 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 98% | 42,003 psi | 67% | 2595 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 88% | 34,664 psi | 56% | 2464 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,095 psi | 77% | 2513 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 38,711 psi | 62% | 2477 fps | 95% |
| Bofors RP3 | <<locked>> | 82% | 32,111 psi | 51% | 2352 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,495 psi | 67% | 2451 fps | 98.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 37,260 psi | 60% | 2457 fps | 97.8% |
| Hodgdon CFE223 | 53.6 gr | 80% | 41,060 psi | 66% | 2582 fps | 96.4% |
| Hodgdon H322 | <<locked>> | 80% | 44,875 psi | 72% | 2556 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,484 psi | 73% | 2575 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 43,453 psi | 70% | 2562 fps | 95.6% |
| Hodgdon H4895 | <<locked>> | 80% | 37,565 psi | 60% | 2441 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 35,998 psi | 58% | 2441 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,562 psi | 54% | 2402 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,730 psi | 41% | 1457 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,318 psi | 58% | 2402 fps | 96.1% |
| IMR 3031 | <<locked>> | 80% | 36,477 psi | 58% | 2454 fps | 99.9% |
| IMR 4064 | <<locked>> | 84% | 37,898 psi | 61% | 2421 fps | 95.5% |
| IMR 4166 Enduron | <<locked>> | 92% | 52,518 psi | 84% | 2644 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 46,963 psi | 75% | 2503 fps | 100% |
| IMR 4831 | <<locked>> | 98% | 39,842 psi | 64% | 2539 fps | 95.3% |
| IMR 4895 | <<locked>> | 82% | 36,434 psi | 58% | 2444 fps | 95.7% |
| IMR 8208 XBR | <<locked>> | 80% | 39,291 psi | 63% | 2448 fps | 97.7% |
| Lovex D073.5 | <<locked>> | 80% | 43,903 psi | 70% | 2530 fps | 99.3% |
| Lovex D073.6 | <<locked>> | 80% | 35,534 psi | 57% | 2411 fps | 98.4% |
| Lovex S060 | <<locked>> | 80% | 38,247 psi | 61% | 2385 fps | 96.2% |
| Lovex S062 | <<locked>> | 80% | 33,069 psi | 53% | 2326 fps | 96% |
| Lovex S065 | <<locked>> | 98% | 47,050 psi | 75% | 2598 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 52,127 psi | 84% | 2595 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,738 psi | 59% | 2395 fps | 97.2% |
| Norma 202 | <<locked>> | 80% | 36,579 psi | 59% | 2408 fps | 99.1% |
| Norma 203B | <<locked>> | 82% | 34,969 psi | 56% | 2405 fps | 95.1% |
| Norma URP | <<locked>> | 98% | 41,785 psi | 67% | 2585 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 84% | 36,869 psi | 59% | 2464 fps | 95.4% |
| Ramshot TAC | <<locked>> | 84% | 44,701 psi | 72% | 2546 fps | 95.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,232 psi | 61% | 2461 fps | 96.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,801 psi | 69% | 2497 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,889 psi | 42% | 1490 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,179 psi | 71% | 2536 fps | 99.5% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 50,430 psi | 81% | 2651 fps | 95.5% |
| ReloadSwiss RS 52 | 53.3 gr | 84% | 39,262 psi | 63% | 2556 fps | 95.9% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 30,414 psi | 49% | 2359 fps | 95.8% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 41,408 psi | 66% | 2605 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 40,422 psi | 65% | 2451 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 80% | 34,983 psi | 56% | 2349 fps | 96.6% |
| Rottweil R 903 | <<locked>> | 86% | 34,548 psi | 55% | 2402 fps | 95.9% |
| Shooters World Long Rifle | <<locked>> | 98% | 47,050 psi | 75% | 2598 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,534 psi | 57% | 2411 fps | 98.4% |
| Shooters World Precision | <<locked>> | 80% | 33,069 psi | 53% | 2326 fps | 96% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,601 psi | 75% | 2549 fps | 98.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,127 psi | 85% | 2336 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,414 psi | 79% | 2631 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 35,795 psi | 57% | 2444 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,920 psi | 75% | 2549 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 42,685 psi | 68% | 2520 fps | 95.2% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,853 psi | 57% | 2398 fps | 95.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,435 psi | 62% | 2369 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,502 psi | 51% | 2238 fps | 98.7% |
| Somchem S321 | <<locked>> | 80% | 42,177 psi | 68% | 2526 fps | 98.6% |
| Somchem S335 | <<locked>> | 80% | 37,898 psi | 61% | 2375 fps | 99.7% |
| Somchem S341 | <<locked>> | 80% | 36,898 psi | 59% | 2415 fps | 95.6% |
| Somchem S355 | <<locked>> | 84% | 33,504 psi | 54% | 2359 fps | 95.1% |
| Somchem S365 | <<locked>> | 92% | 30,893 psi | 50% | 2375 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 43,627 psi | 70% | 2448 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,522 psi | 62% | 2375 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 33,779 psi | 54% | 2349 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 80% | 34,621 psi | 56% | 2349 fps | 99% |
| Vihtavuori N150 | <<locked>> | 82% | 29,718 psi | 48% | 2251 fps | 95.3% |
| Vihtavuori N160 | <<locked>> | 96% | 41,466 psi | 66% | 2543 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 39,276 psi | 63% | 2444 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 80% | 33,272 psi | 53% | 2333 fps | 98.2% |
| Vihtavuori N550 | <<locked>> | 98% | 43,149 psi | 69% | 2592 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 34,896 psi | 56% | 2372 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 37,985 psi | 61% | 2480 fps | 98.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 34,954 psi | 56% | 2398 fps | 95.8% |
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 94 powders for 8.5 x 63 loaded with the .338 | 200gr | NorthFork Bonded Core. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,864 fps; across all powders the maximum-charge window runs from 1,627 fps to 2,864 fps. Accurate 4350 gives the best case fill at 100 %, and 94 of the 94 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 200.0 gr projectile in 0.338" calls for a 1:17.0 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, ReloadSwiss RS 52 rank at the top here: for 8.5 x 63 with the .338 | 200gr | NorthFork Bonded Core 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.