Load Specifications
Bullet:.338 | 225gr | Speer TBBC
Bullet Manufacturer:Speer
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:1:15.0
Load data in caliber 8.5 x 55 Blaser with .338 | 225gr | Speer TBBC bullet and 105 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 60 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>> | 88% | 55,680 psi | 89% | 2497 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 54,041 psi | 87% | 2523 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 53,287 psi | 85% | 2516 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 55,579 psi | 89% | 2579 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 53,476 psi | 86% | 2503 fps | 95.8% |
| Accurate 4064 | <<locked>> | 96% | 56,405 psi | 90% | 2595 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 48,356 psi | 78% | 2562 fps | 98.5% |
| Accurate LT-30 | <<locked>> | 82% | 55,114 psi | 88% | 2444 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,521 psi | 89% | 2467 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 54,636 psi | 88% | 2585 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 96% | 55,245 psi | 89% | 2579 fps | 99.6% |
| ADI AR 2219 | <<locked>> | 82% | 55,927 psi | 90% | 2556 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 53,925 psi | 86% | 2543 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 53,708 psi | 86% | 2520 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,564 psi | 89% | 2638 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 53,708 psi | 86% | 2687 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 54,824 psi | 88% | 2602 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,317 psi | 89% | 2497 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,521 psi | 89% | 2618 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,892 psi | 77% | 2572 fps | 98.7% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 55,230 psi | 89% | 2710 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,765 psi | 54% | 2323 fps | 96.3% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,070 psi | 87% | 2444 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 54,041 psi | 87% | 2598 fps | 99.3% |
| Bofors RP3 | <<locked>> | 96% | 55,405 psi | 89% | 2618 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 55,898 psi | 90% | 2579 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 88% | 55,970 psi | 90% | 2530 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 56,347 psi | 90% | 2621 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 54,346 psi | 87% | 2657 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 84% | 54,433 psi | 87% | 2539 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,477 psi | 89% | 2566 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 53,258 psi | 85% | 2579 fps | 98.7% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 51,895 psi | 83% | 2612 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 90% | 55,187 psi | 88% | 2598 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,990 psi | 71% | 2464 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 53,780 psi | 86% | 2625 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 53,142 psi | 85% | 2644 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,983 psi | 56% | 1532 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 53,040 psi | 85% | 2552 fps | 99.9% |
| IMR 3031 | <<locked>> | 90% | 54,331 psi | 87% | 2579 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 54,998 psi | 88% | 2566 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,608 psi | 89% | 2549 fps | 97.2% |
| IMR 4198 | <<locked>> | 84% | 55,709 psi | 89% | 2461 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 54,520 psi | 87% | 2562 fps | 96.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,064 psi | 74% | 2513 fps | 98.2% |
| IMR 4895 | <<locked>> | 92% | 53,447 psi | 86% | 2602 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 88% | 53,925 psi | 86% | 2543 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 53,824 psi | 86% | 2530 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 53,780 psi | 86% | 2566 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 54,679 psi | 88% | 2520 fps | 99.8% |
| Lovex S062 | <<locked>> | 94% | 54,375 psi | 87% | 2562 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 53,345 psi | 86% | 2556 fps | 98.1% |
| Lovex S070ᴾ | <<locked>> | 100% | 50,850 psi | 82% | 2539 fps | 96.6% |
| Norma 201 | <<locked>> | 90% | 53,345 psi | 86% | 2536 fps | 100% |
| Norma 202 | <<locked>> | 90% | 53,766 psi | 86% | 2539 fps | 100% |
| Norma 203B | <<locked>> | 94% | 54,665 psi | 88% | 2608 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 48,240 psi | 77% | 2559 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 94% | 55,187 psi | 88% | 2635 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 47,471 psi | 76% | 2549 fps | 96.6% |
| Ramshot TAC | <<locked>> | 88% | 54,259 psi | 87% | 2559 fps | 98.4% |
| Ramshot Wild Boar | <<locked>> | 88% | 53,505 psi | 86% | 2579 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 86% | 54,882 psi | 88% | 2546 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,375 psi | 57% | 1568 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 53,621 psi | 86% | 2530 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 53,751 psi | 86% | 2562 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,695 psi | 89% | 2680 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 55,245 psi | 89% | 2713 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 48,037 psi | 77% | 2585 fps | 98.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 48,936 psi | 78% | 2605 fps | 97.8% |
| Rottweil R 901 | <<locked>> | 88% | 54,360 psi | 87% | 2520 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 53,780 psi | 86% | 2533 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 54,955 psi | 88% | 2605 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 55,898 psi | 90% | 2579 fps | 96.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 53,345 psi | 86% | 2556 fps | 98.1% |
| Shooters World Match Rifle | <<locked>> | 90% | 53,780 psi | 86% | 2566 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 54,375 psi | 87% | 2562 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 50,850 psi | 82% | 2539 fps | 96.6% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 53,229 psi | 85% | 2500 fps | 99.9% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 56,057 psi | 90% | 2566 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 53,272 psi | 85% | 2615 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 53,011 psi | 85% | 2477 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 56,028 psi | 90% | 2589 fps | 99% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 56,246 psi | 90% | 2605 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,274 psi | 89% | 2484 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 54,926 psi | 88% | 2480 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 53,882 psi | 86% | 2513 fps | 96.8% |
| Somchem S321 | <<locked>> | 86% | 55,042 psi | 88% | 2575 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,447 psi | 87% | 2484 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,259 psi | 89% | 2575 fps | 99.8% |
| Somchem S355 | <<locked>> | 98% | 55,637 psi | 89% | 2605 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,917 psi | 69% | 2513 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 86% | 55,288 psi | 89% | 2454 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,259 psi | 89% | 2470 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 56,289 psi | 90% | 2543 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 53,969 psi | 87% | 2520 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 53,635 psi | 86% | 2543 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,662 psi | 81% | 2556 fps | 98.7% |
| Vihtavuori N530 | <<locked>> | 88% | 54,244 psi | 87% | 2543 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 55,825 psi | 90% | 2562 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,676 psi | 80% | 2562 fps | 98.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,795 psi | 57% | 2388 fps | 96.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 51,503 psi | 83% | 2543 fps | 99.8% |
| Winchester 748 | <<locked>> | 88% | 53,592 psi | 86% | 2585 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 51,895 psi | 83% | 2612 fps | 96.7% |
| Winchester StaBALL Match | <<locked>> | 92% | 55,956 psi | 90% | 2612 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% | 43,482 psi | 70% | 2333 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,355 psi | 76% | 2431 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,129 psi | 58% | 2260 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,467 psi | 68% | 2392 fps | 99.9% |
| Accurate 2700 | <<locked>> | 90% | 50,227 psi | 81% | 2457 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 34,171 psi | 55% | 2251 fps | 99.6% |
| Accurate 4350 | <<locked>> | 90% | 34,345 psi | 55% | 2313 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 51,706 psi | 83% | 2402 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,112 psi | 84% | 2425 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 39,958 psi | 64% | 2349 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 80% | 34,084 psi | 55% | 2215 fps | 95.4% |
| ADI AR 2219 | <<locked>> | 80% | 52,141 psi | 84% | 2510 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,003 psi | 67% | 2359 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 41,249 psi | 66% | 2356 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,747 psi | 78% | 2539 fps | 99.7% |
| Alliant Power Pro 2000-MR | 50.8 gr | 80% | 35,969 psi | 58% | 2359 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,214 psi | 53% | 2231 fps | 97% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,153 psi | 79% | 2418 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,853 psi | 57% | 2287 fps | 96.3% |
| Alliant Reloder-16 | <<locked>> | 90% | 35,433 psi | 57% | 2326 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 82% | 30,632 psi | 49% | 2238 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 98% | 31,908 psi | 51% | 2274 fps | 95.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,720 psi | 81% | 2402 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,769 psi | 62% | 2346 fps | 96.5% |
| Bofors RP3 | <<locked>> | 80% | 32,503 psi | 52% | 2231 fps | 96.9% |
| Bofors RP7 | <<locked>> | 96% | 49,516 psi | 79% | 2487 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,048 psi | 71% | 2356 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,161 psi | 64% | 2375 fps | 99.3% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,092 psi | 71% | 2497 fps | 98.4% |
| Hodgdon H322 | <<locked>> | 80% | 47,805 psi | 77% | 2448 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,689 psi | 78% | 2474 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 38,406 psi | 62% | 2333 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 96% | 45,469 psi | 73% | 2510 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 40,263 psi | 65% | 2359 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 30,240 psi | 48% | 2182 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,071 psi | 58% | 2326 fps | 98% |
| Hodgdon Superformance | <<locked>> | 98% | 49,559 psi | 79% | 2589 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,049 psi | 42% | 1368 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,638 psi | 62% | 2316 fps | 98.1% |
| IMR 3031 | <<locked>> | 80% | 39,436 psi | 63% | 2362 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,679 psi | 57% | 2241 fps | 96.3% |
| IMR 4166 Enduron | <<locked>> | 86% | 46,209 psi | 74% | 2405 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 49,705 psi | 80% | 2385 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 48,443 psi | 78% | 2470 fps | 95.6% |
| IMR 4831 | <<locked>> | 92% | 35,650 psi | 57% | 2323 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 36,666 psi | 59% | 2313 fps | 97.2% |
| IMR 8208 XBR | <<locked>> | 80% | 42,003 psi | 67% | 2359 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 80% | 47,166 psi | 76% | 2438 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 38,363 psi | 62% | 2329 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 40,524 psi | 65% | 2297 fps | 98% |
| Lovex S062 | <<locked>> | 80% | 35,433 psi | 57% | 2251 fps | 98.1% |
| Lovex S065 | <<locked>> | 92% | 42,018 psi | 67% | 2375 fps | 95.7% |
| Lovex S070 | <<locked>> | 96% | 44,802 psi | 72% | 2441 fps | 95.2% |
| Norma 201 | <<locked>> | 80% | 39,305 psi | 63% | 2310 fps | 98.8% |
| Norma 202 | <<locked>> | 80% | 39,247 psi | 63% | 2320 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 35,215 psi | 56% | 2277 fps | 96.7% |
| Norma URP | <<locked>> | 90% | 35,114 psi | 56% | 2316 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 34,548 psi | 55% | 2283 fps | 96.2% |
| Ramshot Hunter | <<locked>> | 98% | 44,396 psi | 71% | 2497 fps | 95.8% |
| Ramshot TAC | <<locked>> | 80% | 41,756 psi | 67% | 2359 fps | 95.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,075 psi | 66% | 2379 fps | 98.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,324 psi | 73% | 2402 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,281 psi | 42% | 1401 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,007 psi | 75% | 2434 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 44,411 psi | 71% | 2415 fps | 95.5% |
| ReloadSwiss RS 52 | 49.2 gr | 80% | 36,898 psi | 59% | 2369 fps | 96.6% |
| ReloadSwiss RS 60 | 50 gr | 80% | 30,530 psi | 49% | 2247 fps | 97.7% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 36,724 psi | 59% | 2379 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 40,059 psi | 64% | 2441 fps | 95.3% |
| Rottweil R 901 | <<locked>> | 80% | 43,018 psi | 69% | 2352 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 37,362 psi | 60% | 2267 fps | 98.4% |
| Rottweil R 903 | <<locked>> | 80% | 30,705 psi | 49% | 2182 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 96% | 49,516 psi | 79% | 2487 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 92% | 42,018 psi | 67% | 2375 fps | 95.7% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,363 psi | 62% | 2329 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 35,433 psi | 57% | 2251 fps | 98.1% |
| Shooters World SW4350 | <<locked>> | 96% | 44,802 psi | 72% | 2441 fps | 95.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,690 psi | 80% | 2451 fps | 99.8% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,692 psi | 84% | 2523 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,662 psi | 51% | 2221 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,893 psi | 80% | 2434 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,929 psi | 64% | 2333 fps | 95.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,348 psi | 61% | 2316 fps | 97.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,785 psi | 65% | 2274 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,591 psi | 54% | 2156 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 47,340 psi | 76% | 2421 fps | 95.5% |
| Somchem S321 | <<locked>> | 80% | 44,991 psi | 72% | 2431 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 40,379 psi | 65% | 2280 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,479 psi | 63% | 2333 fps | 97.7% |
| Somchem S355 | <<locked>> | 80% | 31,778 psi | 51% | 2192 fps | 96% |
| Somchem S365 | <<locked>> | 86% | 27,630 psi | 44% | 2169 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 46,166 psi | 74% | 2333 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 40,944 psi | 66% | 2274 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,361 psi | 58% | 2257 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,188 psi | 60% | 2264 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 30,095 psi | 48% | 2136 fps | 96.9% |
| Vihtavuori N160 | <<locked>> | 90% | 36,883 psi | 59% | 2320 fps | 95.5% |
| Vihtavuori N530 | <<locked>> | 80% | 41,872 psi | 67% | 2356 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 80% | 35,636 psi | 57% | 2251 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 35,926 psi | 58% | 2320 fps | 95% |
| Vihtavuori N555 | <<locked>> | 98% | 33,750 psi | 54% | 2343 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 30,676 psi | 49% | 2156 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 40,944 psi | 66% | 2392 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 45,658 psi | 73% | 2513 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,666 psi | 60% | 2323 fps | 97.9% |
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 105 powders for 8.5 x 55 Blaser loaded with the .338 | 225gr | Speer TBBC. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,713 fps; across all powders the maximum-charge window runs from 1,532 fps to 2,713 fps. Accurate 4350 gives the best case fill at 100 %, and 105 of the 105 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 54–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:15.0 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 60, ReloadSwiss RS 52 rank at the top here: for 8.5 x 55 Blaser with the .338 | 225gr | Speer TBBC 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.