Load Specifications
Load data in caliber 8.5 x 55 Blaser with .338 | 210gr | Swift Scirocco 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, Hodgdon CFE223 and Ramshot Big Game.
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% | 54,868 psi | 88% | 2572 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,317 psi | 89% | 2661 fps | 99% |
| Accurate 2230 | <<locked>> | 82% | 56,260 psi | 90% | 2674 fps | 99.3% |
| Accurate 2460 | <<locked>> | 86% | 53,417 psi | 86% | 2595 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 55,405 psi | 89% | 2628 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 54,853 psi | 88% | 2651 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 55,085 psi | 88% | 2667 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 43,729 psi | 70% | 2566 fps | 96.7% |
| Accurate LT-30 | <<locked>> | 84% | 55,114 psi | 88% | 2523 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 55,579 psi | 89% | 2546 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 53,969 psi | 87% | 2654 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 98% | 54,694 psi | 88% | 2644 fps | 99% |
| ADI AR 2219 | <<locked>> | 84% | 55,448 psi | 89% | 2635 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 53,272 psi | 85% | 2615 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 92% | 56,159 psi | 90% | 2638 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 54,795 psi | 88% | 2713 fps | 99.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 53,330 psi | 86% | 2753 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 53,896 psi | 86% | 2667 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 86% | 54,882 psi | 88% | 2579 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 54,694 psi | 88% | 2687 fps | 99.2% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,367 psi | 71% | 2575 fps | 96.9% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 50,763 psi | 81% | 2717 fps | 99.4% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,230 psi | 87% | 2526 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 53,490 psi | 86% | 2664 fps | 98.6% |
| Bofors RP3 | <<locked>> | 98% | 53,983 psi | 87% | 2680 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 90% | 55,564 psi | 89% | 2602 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 55,419 psi | 89% | 2690 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 53,519 psi | 86% | 2726 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 86% | 53,954 psi | 87% | 2618 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 55,042 psi | 88% | 2644 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 56,028 psi | 90% | 2694 fps | 98.4% |
| Hodgdon H4895 | <<locked>> | 92% | 54,389 psi | 87% | 2667 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,437 psi | 65% | 2467 fps | 97.5% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 56,202 psi | 90% | 2740 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,519 psi | 55% | 1572 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 55,898 psi | 90% | 2667 fps | 99.7% |
| IMR 3031 | <<locked>> | 92% | 53,476 psi | 86% | 2654 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 54,346 psi | 87% | 2631 fps | 99.1% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,303 psi | 89% | 2612 fps | 96.1% |
| IMR 4198 | <<locked>> | 86% | 55,492 psi | 89% | 2543 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 54,099 psi | 87% | 2625 fps | 95.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 41,974 psi | 67% | 2516 fps | 96.3% |
| IMR 4895 | <<locked>> | 96% | 55,999 psi | 90% | 2717 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 90% | 53,272 psi | 85% | 2615 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 86% | 53,548 psi | 86% | 2608 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 56,246 psi | 90% | 2680 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 54,259 psi | 87% | 2589 fps | 99.4% |
| Lovex S062 | <<locked>> | 96% | 53,563 psi | 86% | 2631 fps | 99.9% |
| Lovex S065ᴾ | <<locked>> | 100% | 49,429 psi | 79% | 2569 fps | 96.4% |
| Norma 200 | <<locked>> | 82% | 54,926 psi | 88% | 2552 fps | 100% |
| Norma 201 | <<locked>> | 94% | 56,101 psi | 90% | 2654 fps | 99.9% |
| Norma 202 | <<locked>> | 94% | 56,434 psi | 90% | 2657 fps | 100% |
| Norma 203B | <<locked>> | 96% | 53,780 psi | 86% | 2674 fps | 99.4% |
| Norma URPᴾ | <<locked>> | 100% | 44,034 psi | 71% | 2559 fps | 96.6% |
| Ramshot Big Game | <<locked>> | 96% | 54,259 psi | 87% | 2700 fps | 99.3% |
| Ramshot TAC | <<locked>> | 90% | 53,751 psi | 86% | 2625 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 90% | 52,721 psi | 85% | 2644 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 88% | 54,650 psi | 88% | 2618 fps | 99.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,838 psi | 56% | 1611 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 53,214 psi | 85% | 2605 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 53,127 psi | 85% | 2621 fps | 96.4% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 54,679 psi | 88% | 2749 fps | 99.2% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 54,215 psi | 87% | 2779 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 43,772 psi | 70% | 2585 fps | 96.3% |
| Rottweil R 901 | <<locked>> | 90% | 53,896 psi | 86% | 2595 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 56,260 psi | 90% | 2644 fps | 99.9% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 53,577 psi | 86% | 2664 fps | 99.7% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 49,429 psi | 79% | 2569 fps | 96.4% |
| Shooters World Match Rifle | <<locked>> | 94% | 56,246 psi | 90% | 2680 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 53,563 psi | 86% | 2631 fps | 99.9% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,026 psi | 85% | 2572 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,883 psi | 90% | 2293 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 55,927 psi | 90% | 2648 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 55,782 psi | 89% | 2730 fps | 99.5% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 56,144 psi | 90% | 2602 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 55,361 psi | 89% | 2651 fps | 98.1% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 55,825 psi | 90% | 2677 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,114 psi | 88% | 2559 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 54,404 psi | 87% | 2552 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 54,549 psi | 87% | 2651 fps | 99.9% |
| Somchem S335 | <<locked>> | 92% | 53,867 psi | 86% | 2556 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 54,766 psi | 88% | 2648 fps | 99.3% |
| Somchem S355ᴾ | <<locked>> | 100% | 54,462 psi | 87% | 2667 fps | 99.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,320 psi | 63% | 2513 fps | 98.6% |
| Vihtavuori N130 | <<locked>> | 88% | 55,042 psi | 88% | 2533 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 54,940 psi | 88% | 2549 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,274 psi | 89% | 2618 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 53,476 psi | 86% | 2592 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 52,547 psi | 84% | 2605 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 46,601 psi | 75% | 2566 fps | 97.1% |
| Vihtavuori N530 | <<locked>> | 90% | 53,896 psi | 86% | 2615 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 96% | 55,056 psi | 88% | 2635 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 45,368 psi | 73% | 2566 fps | 96.7% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,776 psi | 77% | 2556 fps | 99% |
| Winchester 748 | <<locked>> | 90% | 52,852 psi | 85% | 2657 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 55,492 psi | 89% | 2687 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% | 40,306 psi | 65% | 2359 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 51,764 psi | 83% | 2608 fps | 98.5% |
| Accurate 2230 | <<locked>> | 80% | 52,315 psi | 84% | 2618 fps | 98.9% |
| Accurate 2460 | <<locked>> | 80% | 43,729 psi | 70% | 2454 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 32,938 psi | 53% | 2277 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 38,986 psi | 63% | 2405 fps | 99.3% |
| Accurate 4064 | <<locked>> | 80% | 31,169 psi | 50% | 2257 fps | 98.5% |
| Accurate 4350 | <<locked>> | 96% | 37,898 psi | 61% | 2457 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 48,965 psi | 79% | 2441 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,342 psi | 79% | 2461 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 37,130 psi | 60% | 2362 fps | 96.2% |
| ADI AR 2208 | <<locked>> | 86% | 38,029 psi | 61% | 2365 fps | 95.6% |
| ADI AR 2219 | <<locked>> | 80% | 48,573 psi | 78% | 2543 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,088 psi | 63% | 2379 fps | 98% |
| Alliant AR-Comp | <<locked>> | 80% | 37,942 psi | 61% | 2385 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,078 psi | 72% | 2559 fps | 98.7% |
| Alliant Power Pro 2000-MR | 52.3 gr | 84% | 38,029 psi | 61% | 2467 fps | 95% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 32,590 psi | 52% | 2290 fps | 95.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 45,730 psi | 73% | 2451 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 35,331 psi | 57% | 2346 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 96% | 39,276 psi | 63% | 2474 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 88% | 34,389 psi | 55% | 2395 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 47,558 psi | 76% | 2434 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 38,348 psi | 61% | 2405 fps | 95.3% |
| Bofors RP3 | <<locked>> | 82% | 31,836 psi | 51% | 2283 fps | 95.7% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,278 psi | 66% | 2379 fps | 98.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,927 psi | 59% | 2388 fps | 98.1% |
| Hodgdon CFE223 | 51 gr | 80% | 40,567 psi | 65% | 2507 fps | 96.6% |
| Hodgdon H322 | <<locked>> | 80% | 44,367 psi | 71% | 2477 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,150 psi | 72% | 2500 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 40,335 psi | 65% | 2438 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 37,347 psi | 60% | 2375 fps | 96.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 33,649 psi | 54% | 2323 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,359 psi | 53% | 2333 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,715 psi | 41% | 1404 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,926 psi | 58% | 2329 fps | 96.4% |
| IMR 3031 | <<locked>> | 80% | 36,100 psi | 58% | 2382 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 35,186 psi | 56% | 2300 fps | 95% |
| IMR 4166 Enduron | <<locked>> | 92% | 51,953 psi | 83% | 2562 fps | 95.3% |
| IMR 4198 | <<locked>> | 80% | 46,702 psi | 75% | 2425 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 50,792 psi | 81% | 2575 fps | 95% |
| IMR 4831 | <<locked>> | 98% | 39,291 psi | 63% | 2464 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 33,808 psi | 54% | 2323 fps | 95.2% |
| IMR 8208 XBR | <<locked>> | 80% | 39,088 psi | 63% | 2379 fps | 98% |
| Lovex D073.5 | <<locked>> | 80% | 43,540 psi | 70% | 2457 fps | 99.4% |
| Lovex D073.6 | <<locked>> | 80% | 35,259 psi | 57% | 2343 fps | 98.6% |
| Lovex S060 | <<locked>> | 80% | 37,956 psi | 61% | 2313 fps | 96.5% |
| Lovex S062 | <<locked>> | 80% | 32,764 psi | 53% | 2260 fps | 96.3% |
| Lovex S065 | <<locked>> | 96% | 43,743 psi | 70% | 2474 fps | 95% |
| Norma 200 | <<locked>> | 80% | 51,779 psi | 83% | 2513 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,477 psi | 58% | 2326 fps | 97.4% |
| Norma 202 | <<locked>> | 80% | 36,303 psi | 58% | 2339 fps | 99.2% |
| Norma 203B | <<locked>> | 82% | 34,708 psi | 56% | 2336 fps | 95.5% |
| Norma URP | <<locked>> | 96% | 38,856 psi | 62% | 2461 fps | 95.1% |
| Ramshot Big Game | 52.3 gr | 84% | 36,361 psi | 58% | 2388 fps | 95.7% |
| Ramshot TAC | <<locked>> | 84% | 44,440 psi | 71% | 2474 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,942 psi | 61% | 2392 fps | 96.4% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,264 psi | 68% | 2418 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,889 psi | 42% | 1437 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 43,845 psi | 70% | 2461 fps | 99.6% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 49,864 psi | 80% | 2572 fps | 95.7% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 36,245 psi | 58% | 2425 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,355 psi | 45% | 2241 fps | 95.1% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 40,741 psi | 65% | 2526 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 40,030 psi | 64% | 2375 fps | 99.6% |
| Rottweil R 902 | <<locked>> | 80% | 34,621 psi | 56% | 2280 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 84% | 31,923 psi | 51% | 2280 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 96% | 43,743 psi | 70% | 2474 fps | 95% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,259 psi | 57% | 2343 fps | 98.6% |
| Shooters World Precision | <<locked>> | 80% | 32,764 psi | 53% | 2260 fps | 96.3% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,253 psi | 74% | 2474 fps | 99% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 52,997 psi | 85% | 2260 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 48,994 psi | 79% | 2552 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 35,505 psi | 57% | 2375 fps | 95.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,412 psi | 74% | 2467 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 42,221 psi | 68% | 2444 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,621 psi | 57% | 2329 fps | 95.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,000 psi | 61% | 2297 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,125 psi | 50% | 2172 fps | 98.9% |
| Somchem S321 | <<locked>> | 80% | 41,640 psi | 67% | 2448 fps | 98.8% |
| Somchem S335 | <<locked>> | 80% | 37,637 psi | 60% | 2303 fps | 99.7% |
| Somchem S341 | <<locked>> | 80% | 36,448 psi | 58% | 2339 fps | 95.8% |
| Somchem S355 | <<locked>> | 84% | 33,228 psi | 53% | 2293 fps | 95.5% |
| Somchem S365 | <<locked>> | 92% | 30,560 psi | 49% | 2310 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 43,163 psi | 69% | 2369 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,087 psi | 61% | 2300 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 33,330 psi | 53% | 2277 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,389 psi | 55% | 2280 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 82% | 29,443 psi | 47% | 2185 fps | 95.6% |
| Vihtavuori N160 | <<locked>> | 96% | 40,843 psi | 65% | 2464 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 38,957 psi | 62% | 2372 fps | 98.1% |
| Vihtavuori N540 | <<locked>> | 80% | 32,996 psi | 53% | 2267 fps | 98.5% |
| Vihtavuori N550 | <<locked>> | 96% | 40,045 psi | 64% | 2470 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 34,461 psi | 55% | 2303 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 37,753 psi | 61% | 2408 fps | 98.5% |
| Winchester StaBALL Match | <<locked>> | 80% | 34,635 psi | 56% | 2329 fps | 96.1% |
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 | 210gr | Swift Scirocco. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,779 fps; across all powders the maximum-charge window runs from 1,572 fps to 2,779 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 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-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, Ramshot Big Game rank at the top here: for 8.5 x 55 Blaser 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.