Load Specifications
Load data in caliber 8.5 x 55 Blaser with .338 | 220gr | Reichenberg HDB Universal 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 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% | 56,028 psi | 90% | 2533 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 56,376 psi | 90% | 2628 fps | 99.4% |
| Accurate 2460 | <<locked>> | 86% | 54,215 psi | 87% | 2556 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 52,620 psi | 84% | 2543 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 55,883 psi | 90% | 2612 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 55,883 psi | 90% | 2625 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 44,701 psi | 72% | 2536 fps | 97.6% |
| Accurate LT-30 | <<locked>> | 84% | 56,043 psi | 90% | 2484 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 53,229 psi | 85% | 2464 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 54,882 psi | 88% | 2618 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 98% | 56,072 psi | 90% | 2615 fps | 99.5% |
| ADI AR 2219 | <<locked>> | 82% | 52,924 psi | 85% | 2549 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 54,534 psi | 87% | 2579 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 54,012 psi | 87% | 2556 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 55,970 psi | 90% | 2674 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 54,433 psi | 87% | 2723 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 54,984 psi | 88% | 2631 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 56,043 psi | 90% | 2539 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 56,057 psi | 90% | 2654 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,136 psi | 72% | 2549 fps | 97.8% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 52,112 psi | 84% | 2690 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 55,143 psi | 88% | 2484 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,636 psi | 88% | 2631 fps | 99.1% |
| Bofors RP3 | <<locked>> | 98% | 55,434 psi | 89% | 2648 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 88% | 53,301 psi | 85% | 2523 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 52,939 psi | 85% | 2605 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,824 psi | 88% | 2694 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 86% | 55,361 psi | 89% | 2582 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 56,405 psi | 90% | 2605 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 53,432 psi | 86% | 2608 fps | 98.5% |
| Hodgdon H4895 | <<locked>> | 92% | 55,347 psi | 89% | 2628 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,118 psi | 66% | 2441 fps | 98.3% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 54,201 psi | 87% | 2661 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,534 psi | 55% | 1539 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 53,751 psi | 86% | 2589 fps | 99.8% |
| IMR 3031 | <<locked>> | 92% | 54,694 psi | 88% | 2615 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 55,390 psi | 89% | 2598 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 94% | 56,217 psi | 90% | 2579 fps | 96.9% |
| IMR 4198 | <<locked>> | 84% | 53,200 psi | 85% | 2461 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 55,129 psi | 88% | 2595 fps | 96.6% |
| IMR 4831ᴾ | <<locked>> | 100% | 42,815 psi | 69% | 2487 fps | 97.2% |
| IMR 4895 | <<locked>> | 94% | 53,824 psi | 86% | 2635 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 90% | 54,534 psi | 87% | 2579 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 54,317 psi | 87% | 2566 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 53,925 psi | 86% | 2598 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 55,477 psi | 89% | 2556 fps | 99.7% |
| Lovex S062 | <<locked>> | 96% | 54,520 psi | 87% | 2595 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 50,227 psi | 81% | 2536 fps | 97.2% |
| Norma 200 | <<locked>> | 82% | 55,521 psi | 89% | 2510 fps | 100% |
| Norma 201 | <<locked>> | 92% | 53,635 psi | 86% | 2569 fps | 100% |
| Norma 202 | <<locked>> | 92% | 53,882 psi | 86% | 2572 fps | 100% |
| Norma 203B | <<locked>> | 96% | 55,158 psi | 88% | 2644 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 45,121 psi | 72% | 2536 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 96% | 55,796 psi | 89% | 2671 fps | 99.7% |
| Ramshot TAC | <<locked>> | 90% | 54,998 psi | 88% | 2595 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 90% | 54,085 psi | 87% | 2612 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 88% | 55,854 psi | 90% | 2585 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,824 psi | 56% | 1578 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 54,172 psi | 87% | 2566 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 54,099 psi | 87% | 2592 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 56,115 psi | 90% | 2717 fps | 99.6% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 55,738 psi | 89% | 2746 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 44,628 psi | 72% | 2556 fps | 97.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 46,180 psi | 74% | 2579 fps | 96.7% |
| Rottweil R 901 | <<locked>> | 90% | 54,433 psi | 87% | 2552 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 53,809 psi | 86% | 2562 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 54,969 psi | 88% | 2635 fps | 99.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 50,227 psi | 81% | 2536 fps | 97.2% |
| Shooters World Match Rifle | <<locked>> | 92% | 53,925 psi | 86% | 2598 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 54,520 psi | 87% | 2595 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,925 psi | 86% | 2536 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 56,333 psi | 90% | 2247 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 53,447 psi | 86% | 2562 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 53,461 psi | 86% | 2644 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 53,519 psi | 86% | 2513 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 52,721 psi | 85% | 2569 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 53,447 psi | 86% | 2595 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 56,014 psi | 90% | 2520 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 55,463 psi | 89% | 2513 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 50,865 psi | 82% | 2497 fps | 95.8% |
| Somchem S321 | <<locked>> | 88% | 55,550 psi | 89% | 2612 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 54,955 psi | 88% | 2520 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 55,912 psi | 90% | 2612 fps | 99.7% |
| Somchem S355ᴾ | <<locked>> | 100% | 55,477 psi | 89% | 2631 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,972 psi | 64% | 2487 fps | 99.2% |
| Vihtavuori N130 | <<locked>> | 88% | 55,912 psi | 90% | 2490 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,956 psi | 90% | 2507 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 56,405 psi | 90% | 2575 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 54,578 psi | 88% | 2556 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 53,882 psi | 86% | 2572 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 47,572 psi | 76% | 2536 fps | 97.9% |
| Vihtavuori N530 | <<locked>> | 90% | 54,868 psi | 88% | 2579 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 56,130 psi | 90% | 2595 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 46,514 psi | 75% | 2539 fps | 97.5% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 48,834 psi | 78% | 2530 fps | 99.5% |
| Winchester 748 | <<locked>> | 90% | 54,041 psi | 87% | 2621 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 92% | 53,069 psi | 85% | 2602 fps | 99.8% |
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% | 40,741 psi | 65% | 2320 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 52,721 psi | 85% | 2572 fps | 99.1% |
| Accurate 2460 | <<locked>> | 80% | 44,193 psi | 71% | 2415 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 32,953 psi | 53% | 2234 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 39,450 psi | 63% | 2369 fps | 99.6% |
| Accurate 4064 | <<locked>> | 80% | 31,183 psi | 50% | 2221 fps | 99% |
| Accurate 4350 | <<locked>> | 94% | 36,114 psi | 58% | 2379 fps | 95.2% |
| Accurate LT-30 | <<locked>> | 80% | 49,472 psi | 79% | 2398 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,850 psi | 80% | 2418 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 37,579 psi | 60% | 2329 fps | 97% |
| ADI AR 2208 | <<locked>> | 84% | 36,332 psi | 58% | 2290 fps | 95.8% |
| ADI AR 2219 | <<locked>> | 80% | 49,501 psi | 79% | 2503 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,624 psi | 64% | 2346 fps | 98.6% |
| Alliant AR-Comp | <<locked>> | 80% | 38,450 psi | 62% | 2343 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,890 psi | 74% | 2523 fps | 99.2% |
| Alliant Power Pro 2000-MR | 51.3 gr | 82% | 36,143 psi | 58% | 2385 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,835 psi | 49% | 2205 fps | 95.8% |
| Alliant Reloder-10x | <<locked>> | 80% | 46,369 psi | 74% | 2411 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 33,460 psi | 54% | 2264 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 94% | 37,579 psi | 60% | 2398 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 86% | 32,634 psi | 52% | 2316 fps | 95.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 48,573 psi | 78% | 2402 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 36,521 psi | 59% | 2326 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 29,994 psi | 48% | 2201 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,785 psi | 67% | 2343 fps | 99.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 37,434 psi | 60% | 2352 fps | 98.7% |
| Hodgdon CFE223 | <<locked>> | 80% | 41,321 psi | 66% | 2474 fps | 97.5% |
| Hodgdon H322 | <<locked>> | 80% | 45,208 psi | 72% | 2441 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,919 psi | 74% | 2464 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 38,218 psi | 61% | 2356 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 37,826 psi | 61% | 2339 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 32,024 psi | 51% | 2251 fps | 95.4% |
| Hodgdon LEVERevolution | 49.1 gr | 80% | 33,794 psi | 54% | 2306 fps | 96.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,483 psi | 41% | 1371 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,434 psi | 58% | 2297 fps | 97.2% |
| IMR 3031 | <<locked>> | 80% | 36,753 psi | 59% | 2346 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 33,489 psi | 54% | 2221 fps | 95.1% |
| IMR 4166 Enduron | <<locked>> | 90% | 49,777 psi | 80% | 2487 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 47,282 psi | 76% | 2382 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 48,791 psi | 78% | 2500 fps | 95.3% |
| IMR 4831 | <<locked>> | 96% | 37,608 psi | 60% | 2392 fps | 95.8% |
| IMR 4895 | <<locked>> | 80% | 34,229 psi | 55% | 2290 fps | 96.1% |
| IMR 8208 XBR | <<locked>> | 80% | 39,624 psi | 64% | 2346 fps | 98.6% |
| Lovex D073.5 | <<locked>> | 80% | 44,048 psi | 71% | 2421 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 35,636 psi | 57% | 2310 fps | 99.1% |
| Lovex S060 | <<locked>> | 80% | 38,392 psi | 62% | 2283 fps | 97.2% |
| Lovex S062 | <<locked>> | 80% | 33,011 psi | 53% | 2228 fps | 97.1% |
| Lovex S065 | <<locked>> | 94% | 41,814 psi | 67% | 2395 fps | 95.2% |
| Norma 200 | <<locked>> | 80% | 52,315 psi | 84% | 2467 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,738 psi | 59% | 2290 fps | 98.1% |
| Norma 202 | <<locked>> | 80% | 36,753 psi | 59% | 2303 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 32,866 psi | 53% | 2254 fps | 95.5% |
| Norma URP | <<locked>> | 94% | 37,130 psi | 60% | 2385 fps | 95.3% |
| Ramshot Big Game | <<locked>> | 82% | 34,563 psi | 55% | 2310 fps | 95.8% |
| Ramshot TAC | <<locked>> | 82% | 42,119 psi | 68% | 2388 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,493 psi | 62% | 2359 fps | 97.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,830 psi | 69% | 2385 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,643 psi | 41% | 1404 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,527 psi | 71% | 2425 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 90% | 44,585 psi | 71% | 2444 fps | 95.1% |
| ReloadSwiss RS 52 | 48.5 gr | 80% | 34,418 psi | 55% | 2343 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,558 psi | 46% | 2215 fps | 96.3% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 39,001 psi | 63% | 2451 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 43,004 psi | 69% | 2520 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 40,161 psi | 64% | 2336 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 34,824 psi | 56% | 2244 fps | 97.5% |
| Rottweil R 903 | <<locked>> | 82% | 30,081 psi | 48% | 2195 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 94% | 41,814 psi | 67% | 2395 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,636 psi | 57% | 2310 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 33,011 psi | 53% | 2228 fps | 97.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,992 psi | 75% | 2438 fps | 99.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,650 psi | 86% | 2218 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,850 psi | 80% | 2513 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 33,721 psi | 54% | 2297 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 47,282 psi | 76% | 2431 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 40,001 psi | 64% | 2362 fps | 95.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,085 psi | 58% | 2300 fps | 96.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,464 psi | 62% | 2260 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,459 psi | 50% | 2139 fps | 99.3% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 47,456 psi | 76% | 2448 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 42,467 psi | 68% | 2418 fps | 99.3% |
| Somchem S335 | <<locked>> | 80% | 37,971 psi | 61% | 2267 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 37,159 psi | 60% | 2313 fps | 96.8% |
| Somchem S355 | <<locked>> | 82% | 31,372 psi | 50% | 2211 fps | 95.5% |
| Somchem S365 | <<locked>> | 90% | 29,051 psi | 47% | 2234 fps | 95.7% |
| Vihtavuori N130 | <<locked>> | 80% | 43,700 psi | 70% | 2329 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,638 psi | 62% | 2264 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 33,765 psi | 54% | 2241 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,824 psi | 56% | 2247 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 80% | 27,891 psi | 45% | 2110 fps | 95.7% |
| Vihtavuori N160 | <<locked>> | 94% | 39,131 psi | 63% | 2388 fps | 95.8% |
| Vihtavuori N530 | <<locked>> | 80% | 39,436 psi | 63% | 2339 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 80% | 33,359 psi | 53% | 2234 fps | 99% |
| Vihtavuori N550 | <<locked>> | 94% | 38,159 psi | 61% | 2392 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 32,721 psi | 52% | 2228 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 38,421 psi | 62% | 2375 fps | 99.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 35,114 psi | 56% | 2300 fps | 96.9% |
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 | 220gr | Reichenberg HDB Universal. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,746 fps; across all powders the maximum-charge window runs from 1,539 fps to 2,746 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 220.0 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, ReloadSwiss RS 52, Hodgdon LEVERevolution rank at the top here: for 8.5 x 55 Blaser with the .338 | 220gr | Reichenberg HDB Universal 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.