Load Specifications
Bullet:.338 | 225gr | Hornady GMX
Bullet Manufacturer:Hornady
Bullet Weight:225 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:8.5 x 55 Blaser load data
Case Length (l3):2.15"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:77 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:23.62"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:12.0
Load data in caliber 8.5 x 55 Blaser with .338 | 225gr | Hornady GMX bullet and 100 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% | 54,056 psi | 87% | 2457 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 54,549 psi | 87% | 2546 fps | 99.2% |
| Accurate 2230 | <<locked>> | 82% | 55,405 psi | 89% | 2559 fps | 99.5% |
| Accurate 2460 | <<locked>> | 88% | 55,970 psi | 90% | 2526 fps | 100% |
| Accurate 2495 | <<locked>> | 96% | 54,070 psi | 87% | 2510 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 53,824 psi | 86% | 2536 fps | 100% |
| Accurate 4064 | <<locked>> | 98% | 53,809 psi | 86% | 2549 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 42,757 psi | 69% | 2457 fps | 97% |
| Accurate LT-30 | <<locked>> | 84% | 54,520 psi | 87% | 2411 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 54,984 psi | 88% | 2434 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 53,113 psi | 85% | 2543 fps | 99.5% |
| ADI AR 2207 | <<locked>> | 82% | 56,115 psi | 90% | 2428 fps | 100% |
| ADI AR 2208 | <<locked>> | 98% | 53,983 psi | 87% | 2533 fps | 99.2% |
| ADI AR 2219 | <<locked>> | 84% | 54,940 psi | 88% | 2523 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 56,028 psi | 90% | 2549 fps | 100% |
| Alliant AR-Comp | <<locked>> | 92% | 55,448 psi | 89% | 2526 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 54,143 psi | 87% | 2598 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 56,144 psi | 90% | 2690 fps | 99.5% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 56,260 psi | 90% | 2595 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 54,317 psi | 87% | 2467 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 53,896 psi | 86% | 2572 fps | 99.3% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 43,497 psi | 70% | 2467 fps | 97.2% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 50,096 psi | 80% | 2608 fps | 99.6% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 53,476 psi | 86% | 2415 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 52,779 psi | 85% | 2552 fps | 98.8% |
| Bofors RP3 | <<locked>> | 98% | 52,953 psi | 85% | 2566 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 90% | 54,911 psi | 88% | 2490 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 92% | 54,433 psi | 87% | 2575 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 52,823 psi | 85% | 2612 fps | 99.3% |
| Hodgdon H322 | <<locked>> | 86% | 53,330 psi | 86% | 2503 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 54,288 psi | 87% | 2530 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 54,911 psi | 88% | 2575 fps | 98.6% |
| Hodgdon H4895 | <<locked>> | 92% | 53,563 psi | 86% | 2552 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 39,479 psi | 63% | 2362 fps | 97.8% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 55,579 psi | 89% | 2625 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,447 psi | 55% | 1499 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 55,071 psi | 88% | 2552 fps | 99.8% |
| IMR 3031 | <<locked>> | 94% | 56,333 psi | 90% | 2582 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 53,722 psi | 86% | 2523 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 94% | 54,563 psi | 87% | 2503 fps | 96.4% |
| IMR 4198 | <<locked>> | 86% | 54,911 psi | 88% | 2428 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 53,388 psi | 86% | 2516 fps | 96.1% |
| IMR 4831ᴾ | <<locked>> | 100% | 41,075 psi | 66% | 2408 fps | 96.7% |
| IMR 4895 | <<locked>> | 96% | 55,201 psi | 89% | 2602 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 92% | 56,028 psi | 90% | 2549 fps | 100% |
| Lovex D073.4 | <<locked>> | 82% | 56,043 psi | 90% | 2536 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 55,956 psi | 90% | 2536 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 55,361 psi | 89% | 2566 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 53,693 psi | 86% | 2480 fps | 99.5% |
| Lovex S062 | <<locked>> | 98% | 56,231 psi | 90% | 2562 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 48,428 psi | 78% | 2457 fps | 96.7% |
| Norma 200 | <<locked>> | 82% | 53,722 psi | 86% | 2438 fps | 100% |
| Norma 201 | <<locked>> | 94% | 55,100 psi | 88% | 2536 fps | 100% |
| Norma 202 | <<locked>> | 94% | 55,637 psi | 89% | 2546 fps | 100% |
| Norma 203B | <<locked>> | 98% | 56,391 psi | 90% | 2608 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 43,105 psi | 69% | 2451 fps | 96.9% |
| Ramshot Big Game | <<locked>> | 96% | 53,447 psi | 86% | 2585 fps | 99.5% |
| Ramshot TAC | <<locked>> | 90% | 53,142 psi | 85% | 2516 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 92% | 55,622 psi | 89% | 2582 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 88% | 54,056 psi | 87% | 2507 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,519 psi | 55% | 1532 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 55,796 psi | 89% | 2536 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 55,767 psi | 89% | 2559 fps | 97.3% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 53,664 psi | 86% | 2631 fps | 99.4% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 53,606 psi | 86% | 2664 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 42,728 psi | 69% | 2474 fps | 96.6% |
| Rottweil R 901 | <<locked>> | 92% | 55,796 psi | 89% | 2520 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 55,274 psi | 89% | 2530 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 52,533 psi | 84% | 2552 fps | 99.8% |
| Shooters World AR Plus | <<locked>> | 82% | 56,043 psi | 90% | 2536 fps | 100% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 48,428 psi | 78% | 2457 fps | 96.7% |
| Shooters World Match Rifle | <<locked>> | 94% | 55,361 psi | 89% | 2566 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 56,231 psi | 90% | 2562 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 56,101 psi | 90% | 2513 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 55,390 psi | 89% | 2188 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 54,940 psi | 88% | 2533 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 55,071 psi | 88% | 2615 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 55,506 psi | 89% | 2487 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 92% | 54,389 psi | 87% | 2536 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 54,911 psi | 88% | 2562 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 54,230 psi | 87% | 2448 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 53,766 psi | 86% | 2444 fps | 100% |
| Somchem S321 | <<locked>> | 88% | 53,664 psi | 86% | 2536 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 53,127 psi | 85% | 2448 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 53,983 psi | 87% | 2536 fps | 99.5% |
| Somchem S355ᴾ | <<locked>> | 100% | 53,417 psi | 86% | 2552 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 38,232 psi | 61% | 2405 fps | 98.8% |
| Vihtavuori N120 | <<locked>> | 82% | 56,014 psi | 90% | 2379 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 54,172 psi | 87% | 2421 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 54,172 psi | 87% | 2434 fps | 100% |
| Vihtavuori N135 | <<locked>> | 96% | 54,273 psi | 87% | 2503 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 55,927 psi | 90% | 2520 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 51,663 psi | 83% | 2493 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 45,861 psi | 74% | 2457 fps | 97.4% |
| Vihtavuori N530 | <<locked>> | 90% | 53,011 psi | 85% | 2500 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 96% | 54,201 psi | 87% | 2523 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 44,643 psi | 72% | 2461 fps | 97% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 47,079 psi | 75% | 2451 fps | 99.2% |
| Winchester 748 | <<locked>> | 92% | 55,738 psi | 89% | 2592 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 94% | 54,679 psi | 88% | 2572 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% | 39,508 psi | 63% | 2254 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 51,097 psi | 82% | 2497 fps | 98.8% |
| Accurate 2230 | <<locked>> | 80% | 51,590 psi | 83% | 2507 fps | 99.1% |
| Accurate 2460 | <<locked>> | 80% | 42,612 psi | 68% | 2343 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 31,604 psi | 51% | 2169 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 37,927 psi | 61% | 2297 fps | 99.4% |
| Accurate 4064 | <<locked>> | 80% | 29,921 psi | 48% | 2152 fps | 98.6% |
| Accurate 4350 | <<locked>> | 96% | 36,854 psi | 59% | 2352 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 48,385 psi | 78% | 2333 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 48,776 psi | 78% | 2352 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 36,216 psi | 58% | 2257 fps | 96.5% |
| ADI AR 2207 | <<locked>> | 80% | 52,620 psi | 84% | 2385 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 35,157 psi | 56% | 2218 fps | 95.2% |
| ADI AR 2219 | <<locked>> | 80% | 47,950 psi | 77% | 2434 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,276 psi | 61% | 2274 fps | 98.2% |
| Alliant AR-Comp | <<locked>> | 80% | 37,101 psi | 59% | 2277 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 44,179 psi | 71% | 2448 fps | 98.9% |
| Alliant Power Pro 2000-MR | 49.8 gr | 84% | 37,362 psi | 60% | 2365 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 29,660 psi | 48% | 2139 fps | 95.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 45,005 psi | 72% | 2343 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 34,345 psi | 55% | 2238 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 96% | 38,421 psi | 62% | 2365 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 88% | 33,591 psi | 54% | 2293 fps | 95.8% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 47,036 psi | 75% | 2329 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 37,623 psi | 60% | 2303 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 28,718 psi | 46% | 2129 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,393 psi | 65% | 2270 fps | 99% |
| Hodgdon BL-C2 | <<locked>> | 80% | 36,027 psi | 58% | 2283 fps | 98.3% |
| Hodgdon CFE223 | 48.5 gr | 80% | 39,769 psi | 64% | 2398 fps | 97% |
| Hodgdon H322 | <<locked>> | 80% | 43,830 psi | 70% | 2372 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 44,425 psi | 71% | 2392 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 39,262 psi | 63% | 2329 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 36,434 psi | 58% | 2267 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 32,764 psi | 53% | 2221 fps | 95.5% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,518 psi | 52% | 2231 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,396 psi | 41% | 1335 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,317 psi | 57% | 2231 fps | 96.7% |
| IMR 3031 | <<locked>> | 80% | 35,244 psi | 57% | 2274 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 34,534 psi | 55% | 2201 fps | 95.4% |
| IMR 4166 Enduron | <<locked>> | 90% | 48,240 psi | 77% | 2411 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 45,963 psi | 74% | 2313 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 50,227 psi | 81% | 2470 fps | 95.4% |
| IMR 4831 | <<locked>> | 96% | 36,056 psi | 58% | 2313 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 32,880 psi | 53% | 2218 fps | 95.5% |
| IMR 8208 XBR | <<locked>> | 80% | 38,276 psi | 61% | 2274 fps | 98.2% |
| Lovex D073.4 | <<locked>> | 80% | 52,185 psi | 84% | 2487 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 42,583 psi | 68% | 2349 fps | 99.5% |
| Lovex D073.6 | <<locked>> | 80% | 34,287 psi | 55% | 2238 fps | 98.8% |
| Lovex S060 | <<locked>> | 80% | 37,246 psi | 60% | 2215 fps | 96.8% |
| Lovex S062 | <<locked>> | 80% | 31,821 psi | 51% | 2156 fps | 96.6% |
| Lovex S065 | <<locked>> | 96% | 42,960 psi | 69% | 2369 fps | 95.3% |
| Norma 200 | <<locked>> | 80% | 50,749 psi | 81% | 2402 fps | 100% |
| Norma 201 | <<locked>> | 80% | 35,491 psi | 57% | 2221 fps | 97.7% |
| Norma 202 | <<locked>> | 80% | 35,505 psi | 57% | 2234 fps | 99.4% |
| Norma 203B | <<locked>> | 82% | 33,692 psi | 54% | 2228 fps | 95.7% |
| Norma URP | <<locked>> | 96% | 37,913 psi | 61% | 2356 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 82% | 33,315 psi | 53% | 2238 fps | 95.1% |
| Ramshot TAC | <<locked>> | 84% | 43,584 psi | 70% | 2365 fps | 95.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 37,202 psi | 60% | 2287 fps | 96.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,510 psi | 67% | 2316 fps | 97.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,556 psi | 41% | 1368 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 43,120 psi | 69% | 2352 fps | 99.7% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 45,977 psi | 74% | 2418 fps | 95.3% |
| ReloadSwiss RS 52 | 47.1 gr | 82% | 35,433 psi | 57% | 2320 fps | 95.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 27,528 psi | 44% | 2142 fps | 95.5% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 39,827 psi | 64% | 2418 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 38,957 psi | 62% | 2267 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 80% | 33,605 psi | 54% | 2175 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 84% | 30,835 psi | 49% | 2175 fps | 95.5% |
| Shooters World AR Plus | <<locked>> | 80% | 52,185 psi | 84% | 2487 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 96% | 42,960 psi | 69% | 2369 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,287 psi | 55% | 2238 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 31,821 psi | 51% | 2156 fps | 96.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 45,527 psi | 73% | 2365 fps | 99.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 52,330 psi | 84% | 2156 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 48,298 psi | 77% | 2441 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 34,708 psi | 56% | 2274 fps | 95.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,847 psi | 74% | 2359 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 41,394 psi | 66% | 2339 fps | 95.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,925 psi | 56% | 2231 fps | 96% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,318 psi | 60% | 2195 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,458 psi | 49% | 2073 fps | 99.1% |
| Somchem S321 | <<locked>> | 80% | 40,843 psi | 65% | 2343 fps | 99% |
| Somchem S335 | <<locked>> | 80% | 36,796 psi | 59% | 2201 fps | 99.8% |
| Somchem S341 | <<locked>> | 80% | 35,694 psi | 57% | 2241 fps | 96.2% |
| Somchem S355 | <<locked>> | 84% | 32,140 psi | 52% | 2185 fps | 95.7% |
| Somchem S365 | <<locked>> | 92% | 29,646 psi | 48% | 2208 fps | 95.9% |
| Vihtavuori N120 | <<locked>> | 80% | 52,533 psi | 84% | 2339 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 42,496 psi | 68% | 2264 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 37,449 psi | 60% | 2198 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,518 psi | 52% | 2175 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 33,460 psi | 54% | 2178 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 80% | 26,716 psi | 43% | 2041 fps | 95% |
| Vihtavuori N160 | <<locked>> | 94% | 37,594 psi | 60% | 2313 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 38,130 psi | 61% | 2267 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 80% | 32,155 psi | 52% | 2165 fps | 98.6% |
| Vihtavuori N550 | <<locked>> | 96% | 39,102 psi | 63% | 2362 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 31,589 psi | 51% | 2159 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 36,941 psi | 59% | 2303 fps | 98.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,808 psi | 54% | 2228 fps | 96.4% |
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 100 powders for 8.5 x 55 Blaser loaded with the .338 | 225gr | Hornady GMX. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,690 fps; across all powders the maximum-charge window runs from 1,499 fps to 2,690 fps. Accurate 4350 gives the best case fill at 100 %, and 100 of the 100 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 1:12.0 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 | 225gr | Hornady GMX 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.