Load Specifications
Bullet Manufacturer:Speer
Bullet Weight:225 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:8.5 x 63 load data
Case Length (l3):2.48"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:75.5 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 63 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 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% | 53,853 psi | 86% | 2480 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,854 psi | 90% | 2549 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 55,187 psi | 88% | 2543 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 53,867 psi | 86% | 2559 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,245 psi | 89% | 2536 fps | 96.4% |
| Accurate 4064 | <<locked>> | 94% | 54,969 psi | 88% | 2582 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 50,662 psi | 81% | 2602 fps | 98.9% |
| Accurate LT-30 | <<locked>> | 82% | 56,391 psi | 90% | 2467 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 56,289 psi | 90% | 2615 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 94% | 53,882 psi | 86% | 2566 fps | 99.5% |
| ADI Benchmark 8208 | <<locked>> | 88% | 55,535 psi | 89% | 2572 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 55,840 psi | 90% | 2549 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 53,867 psi | 86% | 2621 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 55,579 psi | 89% | 2720 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 53,301 psi | 85% | 2585 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 53,693 psi | 86% | 2484 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 53,998 psi | 87% | 2605 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,574 psi | 79% | 2608 fps | 99% |
| Alliant Reloder-17 | <<locked>> | 98% | 53,751 psi | 86% | 2694 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 35,056 psi | 56% | 2356 fps | 97% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 55,535 psi | 89% | 2467 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 55,941 psi | 90% | 2631 fps | 99.5% |
| Bofors RP3 | <<locked>> | 94% | 53,693 psi | 86% | 2598 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 54,230 psi | 87% | 2566 fps | 96.5% |
| Hodgdon Benchmark | <<locked>> | 86% | 54,070 psi | 87% | 2513 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 54,404 psi | 87% | 2598 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 56,391 psi | 90% | 2690 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 84% | 56,391 psi | 90% | 2566 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 53,548 psi | 86% | 2546 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 54,926 psi | 88% | 2608 fps | 99% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 53,896 psi | 86% | 2648 fps | 97.3% |
| Hodgdon H4350 | <<locked>> | 98% | 55,187 psi | 88% | 2618 fps | 96% |
| Hodgdon H4895 | <<locked>> | 88% | 53,476 psi | 86% | 2579 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,716 psi | 73% | 2497 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,825 psi | 90% | 2654 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 55,216 psi | 89% | 2687 fps | 96.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,157 psi | 56% | 1545 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 54,607 psi | 88% | 2579 fps | 99.9% |
| IMR 3031 | <<locked>> | 90% | 56,362 psi | 90% | 2605 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 53,417 psi | 86% | 2549 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 90% | 53,925 psi | 86% | 2533 fps | 97% |
| IMR 4198 | <<locked>> | 82% | 54,143 psi | 87% | 2448 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 50,734 psi | 81% | 2536 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 98% | 56,275 psi | 90% | 2598 fps | 97.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 48,167 psi | 77% | 2549 fps | 98.6% |
| IMR 4895 | <<locked>> | 92% | 55,332 psi | 89% | 2631 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 55,535 psi | 89% | 2572 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 55,767 psi | 89% | 2559 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 55,738 psi | 89% | 2595 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 56,217 psi | 90% | 2549 fps | 99.9% |
| Lovex S062 | <<locked>> | 94% | 56,275 psi | 90% | 2592 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 55,172 psi | 88% | 2589 fps | 98.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,591 psi | 84% | 2572 fps | 97.1% |
| Norma 201 | <<locked>> | 90% | 55,027 psi | 88% | 2566 fps | 100% |
| Norma 202 | <<locked>> | 90% | 55,448 psi | 89% | 2569 fps | 100% |
| Norma 203B | <<locked>> | 92% | 53,156 psi | 85% | 2592 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 50,096 psi | 80% | 2592 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 92% | 53,476 psi | 86% | 2615 fps | 99.7% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 49,211 psi | 79% | 2585 fps | 97.2% |
| Ramshot TAC | <<locked>> | 88% | 55,811 psi | 89% | 2589 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 88% | 55,216 psi | 89% | 2608 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 53,142 psi | 85% | 2530 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,549 psi | 57% | 1581 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 55,042 psi | 88% | 2552 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 55,550 psi | 89% | 2592 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 54,201 psi | 87% | 2664 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 53,577 psi | 86% | 2697 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 50,053 psi | 80% | 2621 fps | 98.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,792 psi | 81% | 2641 fps | 98.3% |
| Rottweil R 901 | <<locked>> | 88% | 56,260 psi | 90% | 2549 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 55,390 psi | 89% | 2562 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 53,563 psi | 86% | 2592 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 54,230 psi | 87% | 2566 fps | 96.5% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 55,172 psi | 88% | 2589 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 90% | 55,738 psi | 89% | 2595 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 56,275 psi | 90% | 2592 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,591 psi | 84% | 2572 fps | 97.1% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 54,853 psi | 88% | 2530 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 55,187 psi | 88% | 2644 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 54,578 psi | 88% | 2503 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 54,027 psi | 87% | 2566 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 54,607 psi | 88% | 2589 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 53,548 psi | 86% | 2467 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 53,316 psi | 85% | 2467 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,912 psi | 90% | 2546 fps | 97.3% |
| Somchem S321 | <<locked>> | 84% | 53,026 psi | 85% | 2556 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 56,028 psi | 90% | 2510 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 53,548 psi | 86% | 2559 fps | 99.7% |
| Somchem S355 | <<locked>> | 96% | 53,983 psi | 87% | 2589 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,599 psi | 72% | 2546 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 84% | 53,534 psi | 86% | 2438 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 53,650 psi | 86% | 2454 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 54,955 psi | 88% | 2533 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 55,883 psi | 90% | 2546 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,593 psi | 89% | 2572 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,765 psi | 85% | 2592 fps | 99% |
| Vihtavuori N530 | <<locked>> | 88% | 56,159 psi | 90% | 2572 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 54,128 psi | 87% | 2546 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,663 psi | 83% | 2595 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,608 psi | 60% | 2428 fps | 97% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,563 psi | 86% | 2579 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 55,535 psi | 89% | 2615 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 54,186 psi | 87% | 2654 fps | 97.3% |
| Winchester StaBALL Match | <<locked>> | 90% | 54,288 psi | 87% | 2595 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% | 44,889 psi | 72% | 2356 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,878 psi | 78% | 2457 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,492 psi | 60% | 2287 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,918 psi | 70% | 2418 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 51,779 psi | 83% | 2487 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 35,462 psi | 57% | 2277 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 35,795 psi | 57% | 2346 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 53,069 psi | 85% | 2425 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 41,176 psi | 66% | 2375 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 80% | 35,157 psi | 56% | 2241 fps | 95.9% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,178 psi | 69% | 2385 fps | 99.4% |
| Alliant AR-Comp | <<locked>> | 80% | 42,859 psi | 69% | 2379 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,285 psi | 81% | 2569 fps | 99.8% |
| Alliant Power Pro 2000-MR | 52.6 gr | 80% | 37,289 psi | 60% | 2392 fps | 96.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,374 psi | 55% | 2257 fps | 97.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,720 psi | 81% | 2444 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 36,970 psi | 59% | 2313 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 90% | 36,608 psi | 59% | 2359 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 82% | 31,633 psi | 51% | 2270 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 96% | 31,111 psi | 50% | 2260 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 52,214 psi | 84% | 2428 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 40,161 psi | 64% | 2375 fps | 97% |
| Bofors RP3 | <<locked>> | 80% | 33,866 psi | 54% | 2260 fps | 97.5% |
| Bofors RP7 | <<locked>> | 94% | 48,008 psi | 77% | 2470 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,208 psi | 72% | 2379 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,742 psi | 67% | 2405 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 45,745 psi | 73% | 2530 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 80% | 49,443 psi | 79% | 2477 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 50,140 psi | 80% | 2497 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 37,260 psi | 60% | 2313 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 94% | 44,338 psi | 71% | 2497 fps | 95% |
| Hodgdon H4350 | <<locked>> | 96% | 51,909 psi | 83% | 2569 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 41,481 psi | 67% | 2385 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 31,401 psi | 50% | 2215 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,318 psi | 60% | 2356 fps | 98.3% |
| Hodgdon Superformance | <<locked>> | 96% | 47,718 psi | 77% | 2569 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,063 psi | 42% | 1375 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 40,001 psi | 64% | 2346 fps | 98.4% |
| IMR 3031 | <<locked>> | 80% | 40,944 psi | 66% | 2388 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,840 psi | 59% | 2270 fps | 96.8% |
| IMR 4166 Enduron | <<locked>> | 86% | 47,601 psi | 76% | 2434 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 50,821 psi | 81% | 2405 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 47,790 psi | 77% | 2490 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 47,108 psi | 76% | 2457 fps | 95.5% |
| IMR 4831 | <<locked>> | 90% | 34,708 psi | 56% | 2303 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 37,855 psi | 61% | 2343 fps | 97.6% |
| IMR 8208 XBR | <<locked>> | 80% | 43,178 psi | 69% | 2385 fps | 99.4% |
| Lovex D073.5 | <<locked>> | 80% | 48,588 psi | 78% | 2464 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 39,827 psi | 64% | 2359 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 41,655 psi | 67% | 2323 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 36,666 psi | 59% | 2277 fps | 98.4% |
| Lovex S065 | <<locked>> | 90% | 40,843 psi | 65% | 2359 fps | 95.5% |
| Lovex S070 | <<locked>> | 94% | 43,584 psi | 70% | 2425 fps | 95% |
| Norma 201 | <<locked>> | 80% | 40,524 psi | 65% | 2336 fps | 99.1% |
| Norma 202 | <<locked>> | 80% | 40,509 psi | 65% | 2346 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,361 psi | 58% | 2303 fps | 97.2% |
| Norma URP | <<locked>> | 90% | 36,405 psi | 58% | 2346 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 35,868 psi | 58% | 2316 fps | 96.8% |
| Ramshot Hunter | <<locked>> | 96% | 43,149 psi | 69% | 2480 fps | 95.6% |
| Ramshot TAC | <<locked>> | 80% | 43,120 psi | 69% | 2388 fps | 96.3% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,351 psi | 68% | 2405 fps | 98.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,789 psi | 75% | 2431 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,310 psi | 42% | 1407 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,472 psi | 78% | 2464 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 43,047 psi | 69% | 2398 fps | 95.3% |
| ReloadSwiss RS 52 | 50.9 gr | 80% | 38,334 psi | 61% | 2402 fps | 97.2% |
| ReloadSwiss RS 60 | 51.8 gr | 80% | 31,705 psi | 51% | 2283 fps | 98.3% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 35,824 psi | 57% | 2362 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 38,783 psi | 62% | 2421 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 44,396 psi | 71% | 2379 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,551 psi | 62% | 2293 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 31,836 psi | 51% | 2208 fps | 96.5% |
| Rottweil R 907 | <<locked>> | 94% | 48,008 psi | 77% | 2470 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 40,843 psi | 65% | 2359 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,827 psi | 64% | 2359 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 36,666 psi | 59% | 2277 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 94% | 43,584 psi | 70% | 2425 fps | 95% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,329 psi | 82% | 2480 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,779 psi | 53% | 2251 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,488 psi | 83% | 2461 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,162 psi | 66% | 2362 fps | 96.4% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,624 psi | 64% | 2346 fps | 97.9% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 42,090 psi | 67% | 2300 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,780 psi | 56% | 2182 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 45,890 psi | 74% | 2405 fps | 95.3% |
| Somchem S321 | <<locked>> | 80% | 46,528 psi | 75% | 2461 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 41,582 psi | 67% | 2303 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,930 psi | 66% | 2362 fps | 98.1% |
| Somchem S355 | <<locked>> | 80% | 32,938 psi | 53% | 2218 fps | 96.6% |
| Somchem S365 | <<locked>> | 84% | 26,905 psi | 43% | 2149 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 47,587 psi | 76% | 2359 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,293 psi | 68% | 2297 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,753 psi | 61% | 2283 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,377 psi | 62% | 2287 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,169 psi | 50% | 2162 fps | 97.4% |
| Vihtavuori N160 | <<locked>> | 88% | 35,839 psi | 57% | 2303 fps | 95.3% |
| Vihtavuori N530 | <<locked>> | 80% | 43,279 psi | 69% | 2385 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 36,883 psi | 59% | 2277 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 90% | 37,376 psi | 60% | 2349 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 96% | 32,996 psi | 53% | 2326 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 31,589 psi | 51% | 2185 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 42,424 psi | 68% | 2421 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 44,338 psi | 71% | 2497 fps | 95% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,957 psi | 62% | 2349 fps | 98.3% |
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 63 loaded with the .338 | 225gr | Speer Grand Slam. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,720 fps; across all powders the maximum-charge window runs from 1,545 fps to 2,720 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 56–90 %, 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. ReloadSwiss RS 60, Alliant Power Pro 2000-MR, ReloadSwiss RS 52 rank at the top here: for 8.5 x 63 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.