Load Specifications
Bullet:.338 | 250gr | Norma GTX
Bullet Manufacturer:Norma
Bullet Weight:250 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:1:12.5
Load data in caliber 8.5 x 55 Blaser with .338 | 250gr | Norma GTX bullet and 108 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Power Pro 2000-MR 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>> | 86% | 53,388 psi | 86% | 2310 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,376 psi | 89% | 2379 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 54,694 psi | 88% | 2372 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 53,171 psi | 85% | 2388 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 54,636 psi | 88% | 2372 fps | 96.9% |
| Accurate 4064 | <<locked>> | 94% | 54,433 psi | 87% | 2411 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 49,922 psi | 80% | 2434 fps | 99.3% |
| Accurate LT-30 | <<locked>> | 82% | 55,999 psi | 90% | 2297 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 56,434 psi | 90% | 2320 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 55,854 psi | 90% | 2444 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 53,403 psi | 86% | 2398 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 88% | 55,114 psi | 88% | 2402 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 55,390 psi | 89% | 2375 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 53,272 psi | 85% | 2444 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 54,969 psi | 88% | 2546 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 56,304 psi | 90% | 2461 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 53,301 psi | 85% | 2313 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 53,592 psi | 86% | 2434 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 48,936 psi | 78% | 2438 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 98% | 52,910 psi | 85% | 2520 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,563 psi | 55% | 2211 fps | 97.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 37,913 psi | 61% | 2329 fps | 96.3% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 55,143 psi | 88% | 2303 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 55,434 psi | 89% | 2461 fps | 99.7% |
| Bofors RP3 | <<locked>> | 94% | 53,142 psi | 85% | 2431 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 53,664 psi | 86% | 2398 fps | 97% |
| Hodgdon Benchmark | <<locked>> | 86% | 53,708 psi | 86% | 2343 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 53,969 psi | 87% | 2431 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 55,883 psi | 90% | 2516 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 84% | 55,840 psi | 90% | 2395 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 52,997 psi | 85% | 2375 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 54,273 psi | 87% | 2438 fps | 99.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 53,084 psi | 85% | 2477 fps | 97.7% |
| Hodgdon H4350 | <<locked>> | 98% | 54,404 psi | 87% | 2444 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 90% | 56,347 psi | 90% | 2454 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,962 psi | 72% | 2333 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,100 psi | 88% | 2480 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 54,244 psi | 87% | 2510 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,056 psi | 56% | 1427 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 54,143 psi | 87% | 2411 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 55,970 psi | 90% | 2431 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 56,260 psi | 90% | 2425 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 53,388 psi | 86% | 2365 fps | 97.5% |
| IMR 4198 | <<locked>> | 82% | 53,766 psi | 86% | 2277 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 50,386 psi | 81% | 2375 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 98% | 55,767 psi | 89% | 2428 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,398 psi | 76% | 2385 fps | 99% |
| IMR 4895 | <<locked>> | 92% | 54,911 psi | 88% | 2461 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 55,114 psi | 88% | 2402 fps | 100% |
| Lovex D073.4 | <<locked>> | 82% | 53,925 psi | 86% | 2365 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 55,027 psi | 88% | 2388 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 55,071 psi | 88% | 2421 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 55,724 psi | 89% | 2379 fps | 100% |
| Lovex S062 | <<locked>> | 94% | 55,753 psi | 89% | 2421 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 54,462 psi | 87% | 2418 fps | 98.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,054 psi | 83% | 2408 fps | 97.6% |
| Norma 201 | <<locked>> | 90% | 54,563 psi | 87% | 2395 fps | 100% |
| Norma 202 | <<locked>> | 90% | 55,085 psi | 88% | 2398 fps | 100% |
| Norma 203B | <<locked>> | 94% | 56,043 psi | 90% | 2467 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 49,516 psi | 79% | 2428 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 94% | 56,420 psi | 90% | 2490 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,530 psi | 78% | 2421 fps | 97.6% |
| Ramshot TAC | <<locked>> | 88% | 55,317 psi | 89% | 2421 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 88% | 54,549 psi | 87% | 2434 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 86% | 56,173 psi | 90% | 2408 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,549 psi | 57% | 1463 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 54,534 psi | 87% | 2382 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 54,868 psi | 88% | 2425 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 53,548 psi | 86% | 2490 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 52,721 psi | 85% | 2520 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 49,211 psi | 79% | 2451 fps | 99% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,067 psi | 80% | 2474 fps | 98.7% |
| Rottweil R 901 | <<locked>> | 88% | 55,651 psi | 89% | 2375 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 54,766 psi | 88% | 2388 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 56,159 psi | 90% | 2461 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 53,664 psi | 86% | 2398 fps | 97% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 54,462 psi | 87% | 2418 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 90% | 55,071 psi | 88% | 2421 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 55,753 psi | 89% | 2421 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,054 psi | 83% | 2408 fps | 97.6% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 54,360 psi | 87% | 2359 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 54,621 psi | 88% | 2474 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 54,201 psi | 87% | 2329 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 53,374 psi | 86% | 2398 fps | 99.1% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 54,041 psi | 87% | 2418 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 56,376 psi | 90% | 2339 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 56,130 psi | 90% | 2336 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,288 psi | 89% | 2382 fps | 97.7% |
| Somchem S321 | <<locked>> | 86% | 56,202 psi | 90% | 2431 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 55,622 psi | 89% | 2339 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 52,982 psi | 85% | 2392 fps | 99.9% |
| Somchem S355 | <<locked>> | 96% | 53,534 psi | 86% | 2421 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,193 psi | 71% | 2385 fps | 100% |
| Vihtavuori N130 | <<locked>> | 86% | 56,289 psi | 90% | 2306 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 56,420 psi | 90% | 2323 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 54,302 psi | 87% | 2359 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 55,274 psi | 89% | 2375 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 54,723 psi | 88% | 2398 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,127 psi | 84% | 2425 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 88% | 55,550 psi | 89% | 2402 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 53,432 psi | 86% | 2379 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,068 psi | 82% | 2431 fps | 99.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,057 psi | 59% | 2277 fps | 97.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 52,750 psi | 85% | 2411 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 55,100 psi | 88% | 2444 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 53,417 psi | 86% | 2484 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 30,893 psi | 50% | 2192 fps | 96.6% |
| Winchester StaBALL Match | <<locked>> | 90% | 53,737 psi | 86% | 2428 fps | 100% |
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% | 44,425 psi | 71% | 2195 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,370 psi | 78% | 2293 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,072 psi | 59% | 2136 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,497 psi | 70% | 2260 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 48,095 psi | 77% | 2280 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 35,056 psi | 56% | 2129 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 33,098 psi | 53% | 2152 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 52,663 psi | 84% | 2257 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 53,069 psi | 85% | 2280 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,930 psi | 66% | 2224 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 34,896 psi | 56% | 2100 fps | 96.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,931 psi | 69% | 2231 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 42,453 psi | 68% | 2218 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,009 psi | 80% | 2402 fps | 99.9% |
| Alliant Power Pro 2000-MR | 47.6 gr | 80% | 36,840 psi | 59% | 2241 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,229 psi | 55% | 2119 fps | 98.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,343 psi | 81% | 2277 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,782 psi | 59% | 2169 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 34,156 psi | 55% | 2165 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,443 psi | 47% | 2083 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 94% | 29,066 psi | 47% | 2077 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 35,404 psi | 57% | 2277 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,822 psi | 83% | 2264 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,784 psi | 64% | 2224 fps | 97.6% |
| Bofors RP3 | <<locked>> | 80% | 33,547 psi | 54% | 2119 fps | 98.1% |
| Bofors RP7 | <<locked>> | 92% | 44,599 psi | 72% | 2264 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,860 psi | 72% | 2221 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,205 psi | 66% | 2251 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 45,237 psi | 73% | 2365 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 80% | 48,936 psi | 78% | 2310 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,617 psi | 80% | 2333 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 34,592 psi | 55% | 2119 fps | 95.3% |
| Hodgdon H414 | <<locked>> | 94% | 43,801 psi | 70% | 2339 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 94% | 48,124 psi | 77% | 2356 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 41,263 psi | 66% | 2234 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 29,283 psi | 47% | 2034 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,057 psi | 59% | 2208 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 96% | 47,297 psi | 76% | 2408 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,223 psi | 42% | 1273 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,552 psi | 63% | 2192 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 40,567 psi | 65% | 2228 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,608 psi | 59% | 2126 fps | 97.4% |
| IMR 4166 Enduron | <<locked>> | 84% | 44,309 psi | 71% | 2231 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 50,734 psi | 81% | 2241 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 44,396 psi | 71% | 2287 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 90% | 43,874 psi | 70% | 2254 fps | 95.4% |
| IMR 4831 | <<locked>> | 88% | 32,184 psi | 52% | 2116 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 37,637 psi | 60% | 2195 fps | 98.2% |
| IMR 8208 XBR | <<locked>> | 80% | 42,931 psi | 69% | 2231 fps | 99.7% |
| Lovex D073.4 | <<locked>> | 80% | 50,372 psi | 81% | 2320 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 48,080 psi | 77% | 2300 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 39,392 psi | 63% | 2205 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 41,466 psi | 66% | 2172 fps | 98.8% |
| Lovex S062 | <<locked>> | 80% | 36,405 psi | 58% | 2133 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 38,072 psi | 61% | 2165 fps | 95.5% |
| Lovex S070 | <<locked>> | 94% | 43,105 psi | 69% | 2274 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 40,103 psi | 64% | 2182 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 40,335 psi | 65% | 2195 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,158 psi | 58% | 2159 fps | 97.8% |
| Norma URP | <<locked>> | 88% | 33,779 psi | 54% | 2152 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 35,462 psi | 57% | 2169 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 94% | 40,074 psi | 64% | 2280 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 42,757 psi | 69% | 2234 fps | 96.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,872 psi | 67% | 2251 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,311 psi | 74% | 2274 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,310 psi | 42% | 1302 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,211 psi | 77% | 2300 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 39,871 psi | 64% | 2195 fps | 95.1% |
| ReloadSwiss RS 52 | 46.1 gr | 80% | 37,956 psi | 61% | 2247 fps | 97.8% |
| ReloadSwiss RS 60 | 46.9 gr | 80% | 31,357 psi | 50% | 2139 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 35,317 psi | 57% | 2215 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 38,305 psi | 61% | 2270 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 44,135 psi | 71% | 2221 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,261 psi | 61% | 2146 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 31,531 psi | 51% | 2070 fps | 97.2% |
| Rottweil R 907 | <<locked>> | 92% | 44,599 psi | 72% | 2264 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 88% | 38,072 psi | 61% | 2165 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,392 psi | 63% | 2205 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 36,405 psi | 58% | 2133 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 94% | 43,105 psi | 69% | 2274 fps | 95.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 50,778 psi | 81% | 2316 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,474 psi | 52% | 2110 fps | 96.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,155 psi | 82% | 2293 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,727 psi | 65% | 2208 fps | 97% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,276 psi | 63% | 2195 fps | 98.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,800 psi | 67% | 2146 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,519 psi | 55% | 2037 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 42,409 psi | 68% | 2205 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 46,108 psi | 74% | 2300 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 41,147 psi | 66% | 2149 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,553 psi | 65% | 2211 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 32,576 psi | 52% | 2077 fps | 97.2% |
| Somchem S365 | <<locked>> | 82% | 25,135 psi | 40% | 1975 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 47,282 psi | 76% | 2198 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,018 psi | 67% | 2142 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,449 psi | 60% | 2133 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,058 psi | 61% | 2139 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 30,864 psi | 49% | 2024 fps | 98% |
| Vihtavuori N160 | <<locked>> | 86% | 33,170 psi | 53% | 2110 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 42,931 psi | 69% | 2228 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 36,666 psi | 59% | 2133 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 34,577 psi | 55% | 2159 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 94% | 30,690 psi | 49% | 2142 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 29,443 psi | 47% | 2005 fps | 95.8% |
| Winchester 748 | <<locked>> | 80% | 42,163 psi | 68% | 2267 fps | 99.9% |
| Winchester 760 | <<locked>> | 94% | 43,801 psi | 70% | 2339 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 98% | 28,964 psi | 46% | 2136 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,580 psi | 62% | 2201 fps | 98.8% |
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 108 powders for 8.5 x 55 Blaser loaded with the .338 | 250gr | Norma GTX. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,546 fps; across all powders the maximum-charge window runs from 1,427 fps to 2,546 fps. Accurate 4350 gives the best case fill at 100 %, and 108 of the 108 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 50–90 %, leaving at least 10 % headroom. The 250.0 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-23 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. ReloadSwiss RS 60, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for 8.5 x 55 Blaser with the .338 | 250gr | Norma GTX 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.