Load Specifications
Load data in caliber 8.5 x 55 Blaser with .338 | 200gr | Nosler AccuBond bullet and 96 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% | 53,925 psi | 86% | 2631 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 54,520 psi | 87% | 2723 fps | 98.6% |
| Accurate 2230 | <<locked>> | 82% | 55,376 psi | 89% | 2733 fps | 99% |
| Accurate 2460 | <<locked>> | 88% | 56,028 psi | 90% | 2703 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 54,201 psi | 87% | 2687 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 53,780 psi | 86% | 2710 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 53,882 psi | 86% | 2726 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 42,699 psi | 68% | 2615 fps | 96% |
| Accurate LT-30 | <<locked>> | 84% | 54,230 psi | 87% | 2582 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 54,636 psi | 88% | 2605 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 56,405 psi | 90% | 2762 fps | 99.4% |
| ADI AR 2207 | <<locked>> | 82% | 55,796 psi | 89% | 2605 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 53,722 psi | 86% | 2700 fps | 98.6% |
| ADI AR 2219 | <<locked>> | 84% | 54,476 psi | 87% | 2700 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 55,840 psi | 90% | 2723 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 92% | 55,216 psi | 89% | 2707 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 55,825 psi | 90% | 2861 fps | 98.9% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 56,217 psi | 90% | 2772 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 86% | 54,099 psi | 87% | 2644 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 53,838 psi | 86% | 2746 fps | 98.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 43,453 psi | 70% | 2621 fps | 96.1% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 49,937 psi | 80% | 2772 fps | 99.1% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 53,229 psi | 85% | 2582 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 56,318 psi | 90% | 2776 fps | 98.7% |
| Bofors RP3 | <<locked>> | 98% | 53,011 psi | 85% | 2740 fps | 99.6% |
| Hodgdon Benchmark | <<locked>> | 90% | 54,882 psi | 88% | 2664 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 92% | 54,491 psi | 87% | 2749 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 90% | 56,115 psi | 90% | 2838 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 86% | 52,982 psi | 85% | 2677 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 54,128 psi | 87% | 2703 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 54,708 psi | 88% | 2746 fps | 97.9% |
| Hodgdon H4198 | <<locked>> | 82% | 56,304 psi | 90% | 2631 fps | 100% |
| Hodgdon H4895 | <<locked>> | 92% | 53,505 psi | 86% | 2726 fps | 99.4% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 39,552 psi | 63% | 2513 fps | 96.8% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 55,143 psi | 88% | 2799 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,316 psi | 55% | 1617 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 54,940 psi | 88% | 2726 fps | 99.5% |
| IMR 3031 | <<locked>> | 94% | 55,869 psi | 90% | 2762 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 53,417 psi | 86% | 2690 fps | 98.7% |
| IMR 4198 | <<locked>> | 86% | 54,665 psi | 88% | 2605 fps | 100% |
| IMR 4895 | <<locked>> | 96% | 55,201 psi | 89% | 2779 fps | 99.3% |
| IMR 8208 XBR | <<locked>> | 92% | 55,840 psi | 90% | 2723 fps | 99.8% |
| Lovex D073.4 | <<locked>> | 82% | 55,927 psi | 90% | 2710 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 56,043 psi | 90% | 2713 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 55,332 psi | 89% | 2743 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 53,534 psi | 86% | 2651 fps | 99.1% |
| Lovex S062 | <<locked>> | 98% | 56,072 psi | 90% | 2736 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 48,631 psi | 78% | 2621 fps | 95.8% |
| Norma 200 | <<locked>> | 82% | 53,940 psi | 86% | 2618 fps | 100% |
| Norma 201 | <<locked>> | 94% | 55,216 psi | 89% | 2713 fps | 99.8% |
| Norma 202 | <<locked>> | 94% | 55,477 psi | 89% | 2720 fps | 100% |
| Norma 203B | <<locked>> | 98% | 56,420 psi | 90% | 2782 fps | 99.4% |
| Norma URPᴾ | <<locked>> | 100% | 43,192 psi | 69% | 2612 fps | 95.9% |
| Ramshot Big Game | <<locked>> | 96% | 53,156 psi | 85% | 2756 fps | 99% |
| Ramshot TAC | <<locked>> | 90% | 52,997 psi | 85% | 2680 fps | 96.9% |
| Ramshot Wild Boar | <<locked>> | 92% | 55,259 psi | 89% | 2749 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 88% | 53,780 psi | 86% | 2674 fps | 99% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,592 psi | 55% | 1657 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 55,637 psi | 89% | 2710 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 55,593 psi | 89% | 2726 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 53,345 psi | 86% | 2805 fps | 98.8% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 53,388 psi | 86% | 2841 fps | 100% |
| Rottweil R 901 | <<locked>> | 92% | 56,101 psi | 90% | 2700 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 55,288 psi | 89% | 2707 fps | 99.8% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 52,620 psi | 84% | 2723 fps | 99.4% |
| Shooters World AR Plus | <<locked>> | 82% | 55,927 psi | 90% | 2710 fps | 100% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 48,631 psi | 78% | 2621 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 94% | 55,332 psi | 89% | 2743 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 56,072 psi | 90% | 2736 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 55,709 psi | 89% | 2680 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,027 psi | 88% | 2352 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 54,839 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% | 55,042 psi | 88% | 2661 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 54,447 psi | 87% | 2707 fps | 97.7% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 54,694 psi | 88% | 2733 fps | 99.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 54,186 psi | 87% | 2621 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 53,505 psi | 86% | 2615 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 53,592 psi | 86% | 2710 fps | 99.8% |
| Somchem S335 | <<locked>> | 92% | 53,069 psi | 85% | 2618 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 53,882 psi | 86% | 2703 fps | 99% |
| Somchem S355ᴾ | <<locked>> | 100% | 53,577 psi | 86% | 2726 fps | 99.4% |
| Somchem S365ᴾ | <<locked>> | 100% | 38,363 psi | 62% | 2559 fps | 98% |
| Vihtavuori N120 | <<locked>> | 82% | 55,608 psi | 89% | 2552 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 53,998 psi | 87% | 2592 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 53,983 psi | 87% | 2608 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 54,346 psi | 87% | 2680 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 55,709 psi | 89% | 2694 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 51,619 psi | 83% | 2664 fps | 99.8% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 45,701 psi | 73% | 2618 fps | 96.4% |
| Vihtavuori N530 | <<locked>> | 90% | 53,011 psi | 85% | 2674 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 96% | 53,954 psi | 87% | 2694 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 44,585 psi | 71% | 2618 fps | 96% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 46,978 psi | 75% | 2608 fps | 98.5% |
| Winchester 748 | <<locked>> | 92% | 55,506 psi | 89% | 2769 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 54,186 psi | 87% | 2740 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% | 39,624 psi | 64% | 2415 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 50,792 psi | 81% | 2664 fps | 98.1% |
| Accurate 2230 | <<locked>> | 80% | 51,605 psi | 83% | 2677 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% | 38,174 psi | 61% | 2457 fps | 98.9% |
| Accurate 4064 | <<locked>> | 80% | 30,472 psi | 49% | 2303 fps | 98% |
| Accurate 4350 | <<locked>> | 98% | 39,813 psi | 64% | 2559 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 48,008 psi | 77% | 2497 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 48,385 psi | 78% | 2513 fps | 99.9% |
| ADI AR 2206H | <<locked>> | 80% | 36,390 psi | 58% | 2408 fps | 95.5% |
| ADI AR 2207 | <<locked>> | 80% | 52,547 psi | 84% | 2562 fps | 100% |
| ADI AR 2208 | <<locked>> | 88% | 39,653 psi | 64% | 2461 fps | 95.7% |
| ADI AR 2219 | <<locked>> | 80% | 47,776 psi | 77% | 2602 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,363 psi | 62% | 2428 fps | 97.4% |
| Alliant AR-Comp | <<locked>> | 80% | 37,130 psi | 60% | 2441 fps | 100% |
| Alliant Power Pro 2000-MR | 54.7 gr | 86% | 39,856 psi | 64% | 2569 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 31,850 psi | 51% | 2333 fps | 95% |
| Alliant Reloder-10x | <<locked>> | 80% | 45,005 psi | 72% | 2513 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 36,811 psi | 59% | 2441 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 98% | 40,828 psi | 65% | 2569 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 90% | 35,911 psi | 58% | 2490 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 46,818 psi | 75% | 2493 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 40,219 psi | 64% | 2507 fps | 95.4% |
| Bofors RP3 | <<locked>> | 84% | 33,141 psi | 53% | 2375 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,567 psi | 65% | 2431 fps | 98.4% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,187 psi | 58% | 2438 fps | 97.5% |
| Hodgdon CFE223 | 52.1 gr | 80% | 39,769 psi | 64% | 2556 fps | 95.9% |
| Hodgdon H322 | <<locked>> | 80% | 43,787 psi | 70% | 2539 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 44,324 psi | 71% | 2556 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 42,279 psi | 68% | 2539 fps | 95.1% |
| Hodgdon H4198 | <<locked>> | 80% | 52,852 psi | 85% | 2582 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 36,579 psi | 59% | 2421 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 35,012 psi | 56% | 2415 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,590 psi | 52% | 2375 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,498 psi | 41% | 1444 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,418 psi | 57% | 2382 fps | 95.7% |
| IMR 3031 | <<locked>> | 80% | 35,331 psi | 57% | 2431 fps | 99.8% |
| IMR 4064 | <<locked>> | 84% | 36,811 psi | 59% | 2395 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 45,890 psi | 74% | 2484 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 35,302 psi | 57% | 2418 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 38,363 psi | 62% | 2428 fps | 97.4% |
| Lovex D073.4 | <<locked>> | 80% | 52,083 psi | 84% | 2661 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 42,772 psi | 69% | 2510 fps | 99.1% |
| Lovex D073.6 | <<locked>> | 80% | 34,548 psi | 55% | 2392 fps | 98.1% |
| Lovex S060 | <<locked>> | 80% | 37,347 psi | 60% | 2362 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 32,126 psi | 52% | 2306 fps | 95.6% |
| Lovex S065 | <<locked>> | 98% | 45,701 psi | 73% | 2572 fps | 95% |
| Norma 200 | <<locked>> | 80% | 50,865 psi | 82% | 2575 fps | 100% |
| Norma 201 | <<locked>> | 80% | 35,781 psi | 57% | 2372 fps | 96.8% |
| Norma 202 | <<locked>> | 80% | 35,592 psi | 57% | 2388 fps | 98.9% |
| Norma 203B | <<locked>> | 84% | 36,143 psi | 58% | 2431 fps | 95.5% |
| Norma URP | <<locked>> | 98% | 40,524 psi | 65% | 2559 fps | 95.1% |
| Ramshot Big Game | <<locked>> | 86% | 38,101 psi | 61% | 2490 fps | 95.7% |
| Ramshot TAC | <<locked>> | 86% | 46,499 psi | 75% | 2575 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,231 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% | 42,975 psi | 69% | 2513 fps | 99.3% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 52,214 psi | 84% | 2677 fps | 95.7% |
| ReloadSwiss RS 52 | 51.8 gr | 84% | 37,927 psi | 61% | 2526 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 29,631 psi | 48% | 2336 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 39,363 psi | 63% | 2428 fps | 99.3% |
| Rottweil R 902 | <<locked>> | 80% | 33,997 psi | 55% | 2326 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 86% | 33,272 psi | 53% | 2372 fps | 95.3% |
| Shooters World AR Plus | <<locked>> | 80% | 52,083 psi | 84% | 2661 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 98% | 45,701 psi | 73% | 2572 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,548 psi | 55% | 2392 fps | 98.1% |
| Shooters World Precision | <<locked>> | 80% | 32,126 psi | 52% | 2306 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 45,484 psi | 73% | 2526 fps | 98.6% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 52,214 psi | 84% | 2320 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 48,138 psi | 77% | 2612 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 37,144 psi | 60% | 2474 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,658 psi | 73% | 2530 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 44,222 psi | 71% | 2546 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 37,304 psi | 60% | 2431 fps | 95.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,420 psi | 60% | 2349 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,618 psi | 49% | 2218 fps | 98.5% |
| Somchem S321 | <<locked>> | 80% | 40,843 psi | 65% | 2500 fps | 98.3% |
| Somchem S335 | <<locked>> | 80% | 36,956 psi | 59% | 2352 fps | 99.5% |
| Somchem S341 | <<locked>> | 80% | 35,723 psi | 57% | 2388 fps | 95.1% |
| Somchem S355 | <<locked>> | 86% | 34,621 psi | 56% | 2385 fps | 95.5% |
| Somchem S365 | <<locked>> | 94% | 31,937 psi | 51% | 2405 fps | 95.6% |
| Vihtavuori N120 | <<locked>> | 80% | 52,460 psi | 84% | 2513 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 42,525 psi | 68% | 2425 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,478 psi | 60% | 2352 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,648 psi | 52% | 2326 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 80% | 33,692 psi | 54% | 2329 fps | 98.7% |
| Vihtavuori N150 | <<locked>> | 84% | 30,893 psi | 50% | 2280 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 98% | 42,873 psi | 69% | 2566 fps | 95.7% |
| Vihtavuori N530 | <<locked>> | 80% | 38,145 psi | 61% | 2421 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 80% | 32,242 psi | 52% | 2313 fps | 97.9% |
| Vihtavuori N550 | <<locked>> | 98% | 41,640 psi | 67% | 2566 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 36,245 psi | 58% | 2402 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 36,898 psi | 59% | 2454 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,953 psi | 54% | 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 96 powders for 8.5 x 55 Blaser loaded with the .338 | 200gr | Nosler AccuBond. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,861 fps; across all powders the maximum-charge window runs from 1,617 fps to 2,861 fps. Accurate 4350 gives the best case fill at 100 %, and 96 of the 96 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 1:14.5 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 | Nosler AccuBond 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.