Load Specifications
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:1:6.0
Load data in caliber 8.5 x 55 Blaser with .338 | 225gr | Speer Grand Slam bullet and 104 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, Alliant Reloder-17 and ReloadSwiss RS 60.
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% | 55,245 psi | 89% | 2513 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 53,476 psi | 86% | 2536 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 53,185 psi | 85% | 2533 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,332 psi | 89% | 2595 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 56,405 psi | 90% | 2575 fps | 96.9% |
| Accurate 4064 | <<locked>> | 92% | 52,939 psi | 85% | 2572 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,272 psi | 84% | 2644 fps | 99.3% |
| ADI AR 2206H | <<locked>> | 88% | 54,157 psi | 87% | 2605 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 94% | 54,940 psi | 88% | 2598 fps | 99.7% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,229 psi | 85% | 2559 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 53,534 psi | 86% | 2536 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,056 psi | 88% | 2654 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 53,519 psi | 86% | 2713 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,679 psi | 88% | 2621 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 54,955 psi | 88% | 2513 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,390 psi | 89% | 2641 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,705 psi | 81% | 2644 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,100 psi | 88% | 2733 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,056 psi | 58% | 2398 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 39,755 psi | 64% | 2533 fps | 96.4% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 53,679 psi | 86% | 2618 fps | 99.5% |
| Bofors RP3 | <<locked>> | 94% | 55,158 psi | 88% | 2638 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 55,724 psi | 89% | 2605 fps | 97.1% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,245 psi | 89% | 2546 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 55,782 psi | 89% | 2635 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 53,925 psi | 86% | 2674 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 82% | 53,780 psi | 86% | 2552 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 54,752 psi | 88% | 2579 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 52,924 psi | 85% | 2602 fps | 99% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 55,376 psi | 89% | 2690 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 96% | 53,069 psi | 85% | 2605 fps | 95.9% |
| Hodgdon H4895 | <<locked>> | 88% | 54,650 psi | 88% | 2615 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,862 psi | 75% | 2533 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 53,621 psi | 86% | 2644 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 52,634 psi | 84% | 2671 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,273 psi | 57% | 1558 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,999 psi | 90% | 2618 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 54,331 psi | 87% | 2595 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,578 psi | 88% | 2585 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 90% | 54,868 psi | 88% | 2569 fps | 97.5% |
| IMR 4198 | <<locked>> | 82% | 54,882 psi | 88% | 2470 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,083 psi | 84% | 2579 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,172 psi | 87% | 2589 fps | 97.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,617 psi | 80% | 2589 fps | 99% |
| IMR 4895 | <<locked>> | 90% | 53,258 psi | 85% | 2621 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 86% | 53,229 psi | 85% | 2559 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 53,403 psi | 86% | 2549 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 53,563 psi | 86% | 2582 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,070 psi | 87% | 2539 fps | 99.9% |
| Lovex S062 | <<locked>> | 92% | 54,128 psi | 87% | 2582 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 53,359 psi | 86% | 2582 fps | 98.4% |
| Lovex S070ᴾ | <<locked>> | 100% | 53,998 psi | 87% | 2612 fps | 97.6% |
| Norma 201 | <<locked>> | 90% | 56,246 psi | 90% | 2598 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,374 psi | 86% | 2556 fps | 100% |
| Norma 203B | <<locked>> | 92% | 54,534 psi | 87% | 2631 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 51,605 psi | 83% | 2635 fps | 99.2% |
| Ramshot Big Game | <<locked>> | 92% | 55,027 psi | 88% | 2654 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,401 psi | 81% | 2625 fps | 97.7% |
| Ramshot TAC | <<locked>> | 86% | 53,577 psi | 86% | 2579 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 86% | 52,823 psi | 85% | 2592 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,128 psi | 87% | 2562 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,679 psi | 57% | 1598 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 56,304 psi | 90% | 2589 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 53,214 psi | 85% | 2579 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 55,709 psi | 89% | 2703 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,027 psi | 88% | 2736 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 51,750 psi | 83% | 2664 fps | 99.1% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,112 psi | 84% | 2687 fps | 98.8% |
| Rottweil R 901 | <<locked>> | 86% | 54,070 psi | 87% | 2539 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 53,330 psi | 86% | 2552 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,027 psi | 88% | 2628 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 55,724 psi | 89% | 2605 fps | 97.1% |
| Shooters World Long Rifle | <<locked>> | 98% | 53,359 psi | 86% | 2582 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 88% | 53,563 psi | 86% | 2582 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,128 psi | 87% | 2582 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 53,998 psi | 87% | 2612 fps | 97.6% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,028 psi | 90% | 2562 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 53,142 psi | 85% | 2638 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 55,840 psi | 90% | 2533 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,317 psi | 89% | 2605 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,898 psi | 90% | 2625 fps | 99.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,868 psi | 88% | 2500 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,418 psi | 87% | 2497 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 53,592 psi | 86% | 2536 fps | 97.2% |
| Somchem S321 | <<locked>> | 84% | 54,360 psi | 87% | 2592 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 54,012 psi | 87% | 2500 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 54,810 psi | 88% | 2595 fps | 99.9% |
| Somchem S355 | <<locked>> | 96% | 55,347 psi | 89% | 2625 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,006 psi | 74% | 2585 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 54,650 psi | 88% | 2467 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 54,969 psi | 88% | 2487 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,318 psi | 90% | 2562 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 53,722 psi | 86% | 2536 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 53,490 psi | 86% | 2562 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,273 psi | 87% | 2631 fps | 99.4% |
| Vihtavuori N530 | <<locked>> | 86% | 53,708 psi | 86% | 2559 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,405 psi | 89% | 2579 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,011 psi | 85% | 2635 fps | 99.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,725 psi | 62% | 2467 fps | 97.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 54,955 psi | 88% | 2618 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 53,374 psi | 86% | 2605 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 55,666 psi | 89% | 2694 fps | 97.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,126 psi | 52% | 2379 fps | 96.7% |
| Winchester StaBALL Match | <<locked>> | 90% | 55,579 psi | 89% | 2631 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% | 45,818 psi | 73% | 2385 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,125 psi | 80% | 2490 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,406 psi | 62% | 2316 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,179 psi | 72% | 2454 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 49,617 psi | 80% | 2477 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 36,303 psi | 58% | 2310 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 34,548 psi | 55% | 2336 fps | 95.5% |
| ADI AR 2206H | <<locked>> | 80% | 42,090 psi | 67% | 2411 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 80% | 35,810 psi | 57% | 2274 fps | 96.5% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,150 psi | 71% | 2418 fps | 99.6% |
| Alliant AR-Comp | <<locked>> | 80% | 44,106 psi | 71% | 2411 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 51,503 psi | 83% | 2605 fps | 99.9% |
| Alliant Power Pro 2000-MR | 53.8 gr | 80% | 38,014 psi | 61% | 2431 fps | 96.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,288 psi | 57% | 2293 fps | 98% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,677 psi | 83% | 2474 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,898 psi | 61% | 2349 fps | 97.3% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,143 psi | 56% | 2346 fps | 95.6% |
| Alliant Reloder-17 | 53 gr | 80% | 30,414 psi | 49% | 2257 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 30,139 psi | 48% | 2254 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,043 psi | 59% | 2474 fps | 95.4% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,205 psi | 66% | 2415 fps | 97.6% |
| Bofors RP3 | <<locked>> | 80% | 34,780 psi | 56% | 2297 fps | 98% |
| Bofors RP7 | <<locked>> | 92% | 46,137 psi | 74% | 2457 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,195 psi | 74% | 2415 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,656 psi | 68% | 2438 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 46,963 psi | 75% | 2569 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 80% | 50,589 psi | 81% | 2510 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,358 psi | 82% | 2533 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 35,650 psi | 57% | 2297 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 94% | 45,426 psi | 73% | 2536 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 94% | 49,792 psi | 80% | 2556 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 42,467 psi | 68% | 2421 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,211 psi | 48% | 2201 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,392 psi | 62% | 2395 fps | 98.8% |
| Hodgdon Superformance | <<locked>> | 96% | 49,052 psi | 79% | 2612 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,165 psi | 42% | 1391 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,915 psi | 66% | 2379 fps | 98.8% |
| IMR 3031 | <<locked>> | 80% | 41,858 psi | 67% | 2418 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,579 psi | 60% | 2303 fps | 97.3% |
| IMR 4166 Enduron | <<locked>> | 84% | 45,585 psi | 73% | 2421 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 51,880 psi | 83% | 2434 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 46,035 psi | 74% | 2480 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 90% | 45,266 psi | 73% | 2444 fps | 95.3% |
| IMR 4831 | <<locked>> | 88% | 33,504 psi | 54% | 2293 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 38,812 psi | 62% | 2379 fps | 98.1% |
| IMR 8208 XBR | <<locked>> | 80% | 44,150 psi | 71% | 2418 fps | 99.6% |
| Lovex D073.5 | <<locked>> | 80% | 49,806 psi | 80% | 2497 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,046 psi | 66% | 2395 fps | 99.9% |
| Lovex S060 | <<locked>> | 80% | 42,569 psi | 68% | 2356 fps | 98.7% |
| Lovex S062 | <<locked>> | 80% | 37,594 psi | 60% | 2313 fps | 98.8% |
| Lovex S065 | <<locked>> | 88% | 39,392 psi | 63% | 2349 fps | 95.4% |
| Lovex S070 | <<locked>> | 94% | 44,759 psi | 72% | 2464 fps | 95.7% |
| Norma 201 | <<locked>> | 80% | 41,292 psi | 66% | 2369 fps | 99.4% |
| Norma 202 | <<locked>> | 80% | 41,524 psi | 67% | 2379 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,289 psi | 60% | 2339 fps | 97.7% |
| Norma URP | <<locked>> | 88% | 35,128 psi | 56% | 2339 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 36,651 psi | 59% | 2349 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 94% | 41,611 psi | 67% | 2470 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 44,106 psi | 71% | 2425 fps | 96.9% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,395 psi | 70% | 2444 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,630 psi | 76% | 2464 fps | 99.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,614 psi | 43% | 1427 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,516 psi | 79% | 2497 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 41,278 psi | 66% | 2382 fps | 95.1% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,552 psi | 63% | 2441 fps | 97.7% |
| ReloadSwiss RS 60 | 53 gr | 80% | 32,372 psi | 52% | 2320 fps | 98.8% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 36,854 psi | 59% | 2402 fps | 95.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 39,842 psi | 64% | 2464 fps | 95.9% |
| Rottweil R 901 | <<locked>> | 80% | 45,266 psi | 73% | 2408 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,334 psi | 63% | 2326 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 80% | 32,750 psi | 53% | 2247 fps | 97.1% |
| Rottweil R 907 | <<locked>> | 92% | 46,137 psi | 74% | 2457 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,392 psi | 63% | 2349 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,046 psi | 66% | 2395 fps | 99.9% |
| Shooters World Precision | <<locked>> | 80% | 37,594 psi | 60% | 2313 fps | 98.8% |
| Shooters World SW4350 | <<locked>> | 94% | 44,759 psi | 72% | 2464 fps | 95.7% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,257 psi | 84% | 2513 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,721 psi | 54% | 2290 fps | 96.4% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,518 psi | 84% | 2493 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,177 psi | 68% | 2398 fps | 97% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,683 psi | 65% | 2385 fps | 98.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,902 psi | 69% | 2329 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,505 psi | 57% | 2211 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 44,005 psi | 71% | 2392 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 47,645 psi | 76% | 2493 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 42,322 psi | 68% | 2333 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,989 psi | 67% | 2398 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 33,649 psi | 54% | 2251 fps | 97.1% |
| Somchem S365 | <<locked>> | 82% | 25,933 psi | 42% | 2139 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 48,457 psi | 78% | 2388 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,134 psi | 69% | 2326 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,667 psi | 62% | 2313 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,320 psi | 63% | 2323 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,010 psi | 51% | 2198 fps | 97.9% |
| Vihtavuori N160 | <<locked>> | 86% | 34,418 psi | 55% | 2290 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 44,237 psi | 71% | 2418 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 37,739 psi | 61% | 2310 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 36,056 psi | 58% | 2343 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 94% | 32,010 psi | 51% | 2320 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,327 psi | 49% | 2172 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 43,584 psi | 70% | 2457 fps | 99.9% |
| Winchester 760 | <<locked>> | 94% | 45,658 psi | 73% | 2539 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,153 psi | 48% | 2320 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,016 psi | 64% | 2388 fps | 98.7% |
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 104 powders for 8.5 x 55 Blaser loaded with the .338 | 225gr | Speer Grand Slam. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,736 fps; across all powders the maximum-charge window runs from 1,558 fps to 2,736 fps. Accurate 4350 gives the best case fill at 100 %, and 104 of the 104 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (430 MPa), the top charges use 52–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:6.0 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. Alliant Power Pro 2000-MR, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for 8.5 x 55 Blaser with the .338 | 225gr | Speer Grand Slam 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.