Load Specifications
Load data in caliber 8.5 x 55 Blaser with .338 | 225gr | CutEdge Maximus 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 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.
A valid access license is required to use the Personalized Load Calculator.
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% | 55,158 psi | 88% | 2480 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 55,680 psi | 89% | 2575 fps | 99.4% |
| Accurate 2460 | <<locked>> | 86% | 53,534 psi | 86% | 2507 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 55,477 psi | 89% | 2536 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 55,448 psi | 89% | 2566 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 55,071 psi | 88% | 2572 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 44,135 psi | 71% | 2490 fps | 97.5% |
| Accurate LT-30 | <<locked>> | 84% | 55,637 psi | 89% | 2438 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 56,072 psi | 90% | 2457 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 54,317 psi | 87% | 2569 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 98% | 55,361 psi | 89% | 2566 fps | 99.4% |
| ADI AR 2219 | <<locked>> | 84% | 56,057 psi | 90% | 2546 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 53,896 psi | 86% | 2530 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 53,403 psi | 86% | 2510 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 55,332 psi | 89% | 2625 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 53,650 psi | 86% | 2667 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 54,302 psi | 87% | 2582 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 86% | 55,288 psi | 89% | 2487 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 55,347 psi | 89% | 2602 fps | 99.5% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 44,614 psi | 72% | 2500 fps | 97.7% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 51,227 psi | 82% | 2638 fps | 99.8% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 54,607 psi | 88% | 2438 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 54,099 psi | 87% | 2582 fps | 99.1% |
| Bofors RP3 | <<locked>> | 98% | 54,447 psi | 87% | 2595 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 90% | 56,130 psi | 90% | 2516 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 55,869 psi | 90% | 2602 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 54,099 psi | 87% | 2641 fps | 99.5% |
| Hodgdon H322 | <<locked>> | 86% | 54,505 psi | 87% | 2526 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 55,535 psi | 89% | 2552 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 56,275 psi | 90% | 2605 fps | 98.9% |
| Hodgdon H4895 | <<locked>> | 92% | 54,795 psi | 88% | 2579 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 40,596 psi | 65% | 2392 fps | 98.2% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 53,258 psi | 85% | 2605 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,476 psi | 55% | 1509 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 52,895 psi | 85% | 2536 fps | 99.7% |
| IMR 3031 | <<locked>> | 92% | 53,882 psi | 86% | 2562 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 54,868 psi | 88% | 2549 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 94% | 55,840 psi | 90% | 2533 fps | 96.8% |
| IMR 4198 | <<locked>> | 86% | 55,927 psi | 90% | 2451 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 54,607 psi | 88% | 2546 fps | 96.5% |
| IMR 4831ᴾ | <<locked>> | 100% | 42,293 psi | 68% | 2441 fps | 97.2% |
| IMR 4895 | <<locked>> | 94% | 53,055 psi | 85% | 2582 fps | 99.6% |
| IMR 8208 XBR | <<locked>> | 90% | 53,896 psi | 86% | 2530 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 53,722 psi | 86% | 2520 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 53,127 psi | 85% | 2549 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 54,853 psi | 88% | 2507 fps | 99.7% |
| Lovex S062 | <<locked>> | 96% | 53,998 psi | 87% | 2546 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 49,661 psi | 80% | 2487 fps | 97.1% |
| Norma 200 | <<locked>> | 82% | 55,027 psi | 88% | 2461 fps | 100% |
| Norma 201 | <<locked>> | 94% | 56,347 psi | 90% | 2562 fps | 100% |
| Norma 202 | <<locked>> | 92% | 53,243 psi | 85% | 2523 fps | 100% |
| Norma 203B | <<locked>> | 96% | 54,433 psi | 87% | 2592 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 44,324 psi | 71% | 2484 fps | 97.4% |
| Ramshot Big Game | <<locked>> | 96% | 54,752 psi | 88% | 2615 fps | 99.7% |
| Ramshot TAC | <<locked>> | 90% | 54,375 psi | 87% | 2546 fps | 98.1% |
| Ramshot Wild Boar | <<locked>> | 90% | 53,417 psi | 86% | 2562 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 88% | 55,158 psi | 88% | 2533 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,780 psi | 56% | 1545 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 53,447 psi | 86% | 2513 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 53,592 psi | 86% | 2543 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 55,317 psi | 89% | 2664 fps | 99.6% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 54,810 psi | 88% | 2690 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 44,034 psi | 71% | 2507 fps | 97.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 45,498 psi | 73% | 2526 fps | 96.5% |
| Rottweil R 901 | <<locked>> | 90% | 53,853 psi | 86% | 2503 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 53,200 psi | 85% | 2513 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 54,027 psi | 87% | 2579 fps | 99.9% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 49,661 psi | 80% | 2487 fps | 97.1% |
| Shooters World Match Rifle | <<locked>> | 92% | 53,127 psi | 85% | 2549 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 53,998 psi | 87% | 2546 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 53,563 psi | 86% | 2490 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,912 psi | 90% | 2205 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 56,275 psi | 90% | 2559 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 56,362 psi | 90% | 2641 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 52,968 psi | 85% | 2464 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 55,767 psi | 89% | 2569 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 56,260 psi | 90% | 2592 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 55,579 psi | 89% | 2474 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 54,911 psi | 88% | 2467 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 54,839 psi | 88% | 2562 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 54,331 psi | 87% | 2470 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 55,332 psi | 89% | 2562 fps | 99.7% |
| Somchem S355ᴾ | <<locked>> | 100% | 54,795 psi | 88% | 2582 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 39,552 psi | 63% | 2441 fps | 99.2% |
| Vihtavuori N130 | <<locked>> | 88% | 55,303 psi | 89% | 2441 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 55,492 psi | 89% | 2461 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 55,709 psi | 89% | 2526 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 54,027 psi | 87% | 2507 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 52,997 psi | 85% | 2520 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 47,065 psi | 75% | 2490 fps | 97.8% |
| Vihtavuori N530 | <<locked>> | 90% | 54,273 psi | 87% | 2530 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 55,506 psi | 89% | 2549 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 45,847 psi | 74% | 2490 fps | 97.4% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 48,196 psi | 77% | 2480 fps | 99.4% |
| Winchester 748 | <<locked>> | 90% | 53,505 psi | 86% | 2572 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 56,072 psi | 90% | 2602 fps | 99.9% |
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% | 40,408 psi | 65% | 2277 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 52,315 psi | 84% | 2526 fps | 99% |
| Accurate 2460 | <<locked>> | 80% | 43,656 psi | 70% | 2369 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 32,460 psi | 52% | 2192 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 38,928 psi | 62% | 2323 fps | 99.6% |
| Accurate 4064 | <<locked>> | 80% | 30,748 psi | 49% | 2175 fps | 98.9% |
| Accurate 4350 | <<locked>> | 94% | 35,462 psi | 57% | 2329 fps | 95.1% |
| Accurate LT-30 | <<locked>> | 80% | 49,226 psi | 79% | 2356 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 49,617 psi | 80% | 2375 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 37,159 psi | 60% | 2287 fps | 96.9% |
| ADI AR 2208 | <<locked>> | 84% | 35,824 psi | 57% | 2241 fps | 95.7% |
| ADI AR 2219 | <<locked>> | 80% | 49,110 psi | 79% | 2457 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 39,247 psi | 63% | 2300 fps | 98.5% |
| Alliant AR-Comp | <<locked>> | 80% | 38,101 psi | 61% | 2300 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 45,411 psi | 73% | 2477 fps | 99.2% |
| Alliant Power Pro 2000-MR | 49.8 gr | 82% | 35,824 psi | 57% | 2343 fps | 95.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,414 psi | 49% | 2162 fps | 95.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 45,977 psi | 74% | 2365 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 33,098 psi | 53% | 2221 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 94% | 36,970 psi | 59% | 2346 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 86% | 32,213 psi | 52% | 2267 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 47,877 psi | 77% | 2352 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 35,926 psi | 58% | 2280 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 29,617 psi | 47% | 2159 fps | 95.6% |
| Hodgdon Benchmark | <<locked>> | 80% | 41,350 psi | 66% | 2300 fps | 99.3% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,970 psi | 59% | 2310 fps | 98.6% |
| Hodgdon CFE223 | 49.7 gr | 80% | 40,901 psi | 66% | 2428 fps | 97.4% |
| Hodgdon H322 | <<locked>> | 80% | 44,759 psi | 72% | 2395 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 45,397 psi | 73% | 2415 fps | 100% |
| Hodgdon H380 | <<locked>> | 86% | 37,869 psi | 61% | 2313 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 37,434 psi | 60% | 2297 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 31,575 psi | 51% | 2205 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 33,330 psi | 53% | 2260 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,599 psi | 41% | 1348 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,056 psi | 58% | 2254 fps | 97.1% |
| IMR 3031 | <<locked>> | 80% | 36,187 psi | 58% | 2300 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 33,083 psi | 53% | 2178 fps | 95% |
| IMR 4166 Enduron | <<locked>> | 90% | 49,284 psi | 79% | 2438 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 47,021 psi | 75% | 2339 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 96% | 48,196 psi | 77% | 2451 fps | 95.2% |
| IMR 4831 | <<locked>> | 96% | 36,999 psi | 59% | 2343 fps | 95.6% |
| IMR 4895 | <<locked>> | 80% | 33,852 psi | 54% | 2247 fps | 96% |
| IMR 8208 XBR | <<locked>> | 80% | 39,247 psi | 63% | 2300 fps | 98.5% |
| Lovex D073.5 | <<locked>> | 80% | 43,569 psi | 70% | 2372 fps | 99.7% |
| Lovex D073.6 | <<locked>> | 80% | 35,273 psi | 57% | 2267 fps | 99.1% |
| Lovex S060 | <<locked>> | 80% | 37,985 psi | 61% | 2238 fps | 97.1% |
| Lovex S062 | <<locked>> | 80% | 32,590 psi | 52% | 2182 fps | 97% |
| Lovex S065 | <<locked>> | 94% | 41,350 psi | 66% | 2352 fps | 95.1% |
| Norma 200 | <<locked>> | 80% | 51,721 psi | 83% | 2421 fps | 100% |
| Norma 201 | <<locked>> | 80% | 36,274 psi | 58% | 2244 fps | 98% |
| Norma 202 | <<locked>> | 80% | 36,289 psi | 58% | 2257 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 32,460 psi | 52% | 2208 fps | 95.4% |
| Norma URP | <<locked>> | 94% | 36,709 psi | 59% | 2339 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 82% | 34,243 psi | 55% | 2267 fps | 95.7% |
| Ramshot TAC | <<locked>> | 82% | 41,800 psi | 67% | 2346 fps | 95.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 38,072 psi | 61% | 2313 fps | 97.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 42,351 psi | 68% | 2339 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,773 psi | 41% | 1381 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 44,164 psi | 71% | 2379 fps | 99.9% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 46,949 psi | 75% | 2444 fps | 95.7% |
| ReloadSwiss RS 52 | 47.1 gr | 80% | 34,084 psi | 55% | 2300 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,181 psi | 45% | 2172 fps | 96.1% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 38,406 psi | 62% | 2402 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 98% | 42,554 psi | 68% | 2470 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 39,842 psi | 64% | 2290 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 34,360 psi | 55% | 2198 fps | 97.5% |
| Rottweil R 903 | <<locked>> | 82% | 29,733 psi | 48% | 2156 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 94% | 41,350 psi | 66% | 2352 fps | 95.1% |
| Shooters World Match Rifle | <<locked>> | 80% | 35,273 psi | 57% | 2267 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 32,590 psi | 52% | 2182 fps | 97% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 46,470 psi | 75% | 2392 fps | 99.4% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 53,171 psi | 85% | 2175 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 49,313 psi | 79% | 2467 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 33,359 psi | 53% | 2251 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 46,876 psi | 75% | 2385 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 39,436 psi | 63% | 2313 fps | 95.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 35,766 psi | 57% | 2257 fps | 96.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 38,145 psi | 61% | 2218 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,198 psi | 50% | 2100 fps | 99.3% |
| Somchem S321 | <<locked>> | 80% | 41,785 psi | 67% | 2369 fps | 99.2% |
| Somchem S335 | <<locked>> | 80% | 37,521 psi | 60% | 2221 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 36,535 psi | 59% | 2267 fps | 96.6% |
| Somchem S355 | <<locked>> | 82% | 30,980 psi | 50% | 2169 fps | 95.4% |
| Somchem S365 | <<locked>> | 90% | 28,616 psi | 46% | 2188 fps | 95.6% |
| Vihtavuori N130 | <<locked>> | 80% | 43,352 psi | 70% | 2287 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,305 psi | 61% | 2221 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 33,388 psi | 54% | 2198 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 34,403 psi | 55% | 2205 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 80% | 27,528 psi | 44% | 2070 fps | 95.6% |
| Vihtavuori N160 | <<locked>> | 94% | 38,508 psi | 62% | 2339 fps | 95.6% |
| Vihtavuori N530 | <<locked>> | 80% | 39,088 psi | 63% | 2293 fps | 98.6% |
| Vihtavuori N540 | <<locked>> | 80% | 33,011 psi | 53% | 2192 fps | 98.9% |
| Vihtavuori N550 | <<locked>> | 94% | 37,608 psi | 60% | 2346 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 32,271 psi | 52% | 2185 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 37,913 psi | 61% | 2329 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 80% | 34,664 psi | 56% | 2254 fps | 96.8% |
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 96 powders for 8.5 x 55 Blaser loaded with the .338 | 225gr | CutEdge Maximus. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,690 fps; across all powders the maximum-charge window runs from 1,509 fps to 2,690 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 225.0 gr projectile in 0.338" calls for a 1:12.5 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, ReloadSwiss RS 52 rank at the top here: for 8.5 x 55 Blaser with the .338 | 225gr | CutEdge Maximus 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.