Load Specifications
Load data in caliber 8.5 x 55 Blaser with .338 | 200gr | Hornady FTX 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, ReloadSwiss RS 52 and Hodgdon CFE223.
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% | 53,954 psi | 87% | 2635 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 54,201 psi | 87% | 2717 fps | 98.6% |
| Accurate 2230 | <<locked>> | 82% | 55,129 psi | 88% | 2730 fps | 98.9% |
| Accurate 2460 | <<locked>> | 88% | 56,072 psi | 90% | 2703 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 54,302 psi | 87% | 2690 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 53,766 psi | 86% | 2710 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 53,867 psi | 86% | 2726 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 42,511 psi | 68% | 2612 fps | 96% |
| Accurate LT-30 | <<locked>> | 84% | 54,230 psi | 87% | 2585 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 54,679 psi | 88% | 2605 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 53,084 psi | 85% | 2713 fps | 99% |
| ADI AR 2207 | <<locked>> | 82% | 55,825 psi | 90% | 2605 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 53,751 psi | 86% | 2703 fps | 98.6% |
| ADI AR 2219 | <<locked>> | 84% | 54,476 psi | 87% | 2700 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 55,869 psi | 90% | 2723 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 92% | 55,288 psi | 89% | 2707 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 53,795 psi | 86% | 2772 fps | 99.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 55,898 psi | 90% | 2864 fps | 98.9% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 56,289 psi | 90% | 2772 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 86% | 54,157 psi | 87% | 2644 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 53,621 psi | 86% | 2743 fps | 98.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 43,453 psi | 70% | 2621 fps | 96.1% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 49,980 psi | 80% | 2772 fps | 99.1% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 53,301 psi | 85% | 2582 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 56,028 psi | 90% | 2772 fps | 98.6% |
| Bofors RP3 | <<locked>> | 98% | 53,055 psi | 85% | 2740 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 90% | 54,665 psi | 88% | 2661 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 92% | 54,273 psi | 87% | 2749 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 90% | 56,202 psi | 90% | 2838 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 86% | 53,055 psi | 85% | 2680 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 54,186 psi | 87% | 2707 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 54,795 psi | 88% | 2746 fps | 97.9% |
| Hodgdon H4198 | <<locked>> | 82% | 56,362 psi | 90% | 2631 fps | 100% |
| Hodgdon H4895 | <<locked>> | 92% | 53,490 psi | 86% | 2726 fps | 99.4% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 39,610 psi | 64% | 2516 fps | 96.8% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 55,216 psi | 89% | 2799 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,316 psi | 55% | 1617 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 54,998 psi | 88% | 2730 fps | 99.5% |
| IMR 3031 | <<locked>> | 94% | 55,854 psi | 90% | 2762 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 53,447 psi | 86% | 2690 fps | 98.8% |
| IMR 4198 | <<locked>> | 86% | 54,650 psi | 88% | 2608 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 54,940 psi | 88% | 2776 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 92% | 55,869 psi | 90% | 2723 fps | 99.8% |
| Lovex D073.4 | <<locked>> | 82% | 55,927 psi | 90% | 2713 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 56,086 psi | 90% | 2713 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 55,332 psi | 89% | 2743 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 53,606 psi | 86% | 2648 fps | 99.1% |
| Lovex S062 | <<locked>> | 98% | 56,057 psi | 90% | 2736 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 48,428 psi | 78% | 2618 fps | 95.7% |
| Norma 200 | <<locked>> | 82% | 53,940 psi | 86% | 2615 fps | 100% |
| Norma 201 | <<locked>> | 94% | 54,969 psi | 88% | 2710 fps | 99.8% |
| Norma 202 | <<locked>> | 94% | 55,245 psi | 89% | 2717 fps | 100% |
| Norma 203B | <<locked>> | 98% | 56,144 psi | 90% | 2779 fps | 99.4% |
| Norma URPᴾ | <<locked>> | 100% | 43,221 psi | 69% | 2612 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 96% | 53,185 psi | 85% | 2756 fps | 99% |
| Ramshot TAC | <<locked>> | 90% | 53,069 psi | 85% | 2684 fps | 96.9% |
| Ramshot Wild Boar | <<locked>> | 92% | 55,332 psi | 89% | 2753 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 88% | 53,809 psi | 86% | 2674 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,621 psi | 56% | 1657 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 55,666 psi | 89% | 2710 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 55,680 psi | 89% | 2726 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 53,388 psi | 86% | 2805 fps | 98.8% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 53,374 psi | 86% | 2838 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 56,101 psi | 90% | 2700 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 55,376 psi | 89% | 2707 fps | 99.8% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 52,605 psi | 84% | 2723 fps | 99.4% |
| Shooters World AR Plus | <<locked>> | 82% | 55,927 psi | 90% | 2713 fps | 100% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 48,428 psi | 78% | 2618 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 94% | 55,332 psi | 89% | 2743 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 56,057 psi | 90% | 2736 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 55,738 psi | 89% | 2680 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,071 psi | 88% | 2356 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 54,824 psi | 88% | 2707 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 54,679 psi | 88% | 2785 fps | 99.2% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 55,056 psi | 88% | 2664 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 54,447 psi | 87% | 2707 fps | 97.7% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 54,766 psi | 88% | 2733 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 54,201 psi | 87% | 2618 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 53,519 psi | 86% | 2612 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 53,577 psi | 86% | 2710 fps | 99.8% |
| Somchem S335 | <<locked>> | 94% | 56,173 psi | 90% | 2657 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 53,592 psi | 86% | 2700 fps | 99% |
| Somchem S355ᴾ | <<locked>> | 100% | 53,272 psi | 85% | 2723 fps | 99.4% |
| Somchem S365ᴾ | <<locked>> | 100% | 38,348 psi | 61% | 2559 fps | 98% |
| Vihtavuori N120 | <<locked>> | 82% | 55,666 psi | 89% | 2552 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 53,983 psi | 87% | 2595 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 54,012 psi | 87% | 2608 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 54,027 psi | 87% | 2677 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 55,782 psi | 89% | 2697 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 51,692 psi | 83% | 2664 fps | 99.8% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 45,513 psi | 73% | 2615 fps | 96.4% |
| Vihtavuori N530 | <<locked>> | 90% | 52,779 psi | 85% | 2671 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 96% | 53,983 psi | 87% | 2694 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 44,396 psi | 71% | 2615 fps | 96% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,050 psi | 75% | 2608 fps | 98.6% |
| Winchester 748 | <<locked>> | 92% | 55,274 psi | 89% | 2766 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 54,273 psi | 87% | 2743 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% | 39,653 psi | 64% | 2418 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 50,850 psi | 82% | 2664 fps | 98.1% |
| Accurate 2230 | <<locked>> | 80% | 51,372 psi | 82% | 2674 fps | 98.5% |
| Accurate 2460 | <<locked>> | 80% | 42,975 psi | 69% | 2510 fps | 99.7% |
| Accurate 2495 | <<locked>> | 80% | 32,213 psi | 52% | 2326 fps | 99.8% |
| Accurate 2520 | <<locked>> | 80% | 38,189 psi | 61% | 2457 fps | 98.9% |
| Accurate 4064 | <<locked>> | 80% | 30,487 psi | 49% | 2303 fps | 98% |
| Accurate 4350 | <<locked>> | 98% | 39,595 psi | 63% | 2556 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 48,066 psi | 77% | 2497 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 48,443 psi | 78% | 2516 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 36,405 psi | 58% | 2408 fps | 95.5% |
| ADI AR 2207 | <<locked>> | 80% | 52,605 psi | 84% | 2562 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 39,697 psi | 64% | 2461 fps | 95.7% |
| ADI AR 2219 | <<locked>> | 80% | 47,558 psi | 76% | 2598 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,406 psi | 62% | 2428 fps | 97.5% |
| Alliant AR-Comp | <<locked>> | 80% | 36,912 psi | 59% | 2438 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 44,164 psi | 71% | 2612 fps | 98.2% |
| Alliant Power Pro 2000-MR | 54.7 gr | 86% | 39,900 psi | 64% | 2572 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 31,836 psi | 51% | 2333 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 45,063 psi | 72% | 2513 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 36,869 psi | 59% | 2441 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 98% | 40,857 psi | 66% | 2569 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 90% | 35,940 psi | 58% | 2490 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 46,862 psi | 75% | 2493 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 40,205 psi | 64% | 2510 fps | 95.4% |
| Bofors RP3 | <<locked>> | 84% | 33,170 psi | 53% | 2379 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,625 psi | 65% | 2431 fps | 98.5% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,187 psi | 58% | 2434 fps | 97.5% |
| Hodgdon CFE223 | 52.1 gr | 80% | 39,755 psi | 64% | 2552 fps | 95.9% |
| Hodgdon H322 | <<locked>> | 80% | 43,569 psi | 70% | 2533 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 44,324 psi | 71% | 2556 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 42,076 psi | 67% | 2536 fps | 95.1% |
| Hodgdon H4198 | <<locked>> | 80% | 52,881 psi | 85% | 2582 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 36,622 psi | 59% | 2421 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 35,041 psi | 56% | 2415 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,634 psi | 52% | 2379 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,512 psi | 41% | 1444 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,244 psi | 57% | 2375 fps | 95.7% |
| IMR 3031 | <<locked>> | 80% | 35,346 psi | 57% | 2431 fps | 99.8% |
| IMR 4064 | <<locked>> | 84% | 36,811 psi | 59% | 2395 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 45,919 psi | 74% | 2484 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 35,317 psi | 57% | 2421 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 38,406 psi | 62% | 2428 fps | 97.5% |
| Lovex D073.4 | <<locked>> | 80% | 52,112 psi | 84% | 2661 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 42,757 psi | 69% | 2510 fps | 99.1% |
| Lovex D073.6 | <<locked>> | 80% | 34,374 psi | 55% | 2388 fps | 98.1% |
| Lovex S060 | <<locked>> | 80% | 37,362 psi | 60% | 2362 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 32,126 psi | 52% | 2306 fps | 95.6% |
| Lovex S065 | <<locked>> | 98% | 45,687 psi | 73% | 2572 fps | 95% |
| Norma 200 | <<locked>> | 80% | 50,894 psi | 82% | 2575 fps | 100% |
| Norma 201 | <<locked>> | 80% | 35,824 psi | 57% | 2375 fps | 96.8% |
| Norma 202 | <<locked>> | 80% | 35,607 psi | 57% | 2388 fps | 98.9% |
| Norma 203B | <<locked>> | 84% | 36,187 psi | 58% | 2431 fps | 95.5% |
| Norma URP | <<locked>> | 98% | 40,524 psi | 65% | 2559 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 86% | 38,087 psi | 61% | 2490 fps | 95.7% |
| Ramshot TAC | <<locked>> | 86% | 46,557 psi | 75% | 2575 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,246 psi | 60% | 2438 fps | 95.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,568 psi | 67% | 2470 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,657 psi | 41% | 1480 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 43,018 psi | 69% | 2513 fps | 99.4% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 52,286 psi | 84% | 2677 fps | 95.7% |
| ReloadSwiss RS 52 | 51.8 gr | 84% | 37,985 psi | 61% | 2530 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 29,646 psi | 48% | 2336 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 39,378 psi | 63% | 2428 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 80% | 33,997 psi | 55% | 2326 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 86% | 33,286 psi | 53% | 2372 fps | 95.3% |
| Shooters World AR Plus | <<locked>> | 80% | 52,112 psi | 84% | 2661 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 98% | 45,687 psi | 73% | 2572 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,374 psi | 55% | 2388 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 32,126 psi | 52% | 2306 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 45,513 psi | 73% | 2526 fps | 98.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 52,228 psi | 84% | 2320 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 48,196 psi | 77% | 2612 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 37,188 psi | 60% | 2474 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,701 psi | 73% | 2530 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 44,251 psi | 71% | 2546 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 37,318 psi | 60% | 2428 fps | 95.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,478 psi | 60% | 2349 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,603 psi | 49% | 2218 fps | 98.5% |
| Somchem S321 | <<locked>> | 80% | 40,901 psi | 66% | 2500 fps | 98.3% |
| Somchem S335 | <<locked>> | 80% | 36,985 psi | 59% | 2356 fps | 99.5% |
| Somchem S341 | <<locked>> | 80% | 35,708 psi | 57% | 2388 fps | 95.1% |
| Somchem S355 | <<locked>> | 86% | 34,621 psi | 56% | 2385 fps | 95.5% |
| Somchem S365 | <<locked>> | 94% | 31,778 psi | 51% | 2398 fps | 95.6% |
| Vihtavuori N120 | <<locked>> | 80% | 52,475 psi | 84% | 2516 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 42,511 psi | 68% | 2428 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,492 psi | 60% | 2356 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,677 psi | 52% | 2326 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 80% | 33,707 psi | 54% | 2329 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 84% | 30,719 psi | 49% | 2277 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 98% | 42,685 psi | 68% | 2562 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 38,159 psi | 61% | 2421 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 80% | 32,285 psi | 52% | 2313 fps | 97.9% |
| Vihtavuori N550 | <<locked>> | 98% | 41,698 psi | 67% | 2566 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 36,100 psi | 58% | 2398 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 36,883 psi | 59% | 2457 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,997 psi | 55% | 2375 fps | 95.3% |
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 55 Blaser loaded with the .338 | 200gr | Hornady FTX. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,864 fps; across all powders the maximum-charge window runs from 1,617 fps to 2,864 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 200.0 gr projectile in 0.338" calls for a 1:15.5 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 CFE223 rank at the top here: for 8.5 x 55 Blaser with the .338 | 200gr | Hornady FTX 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.