Load Specifications
Bullet:.338 | 225gr | Swift A-Frame
Bullet Manufacturer:Swift
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:1:16.5
Load data in caliber 8.5 x 63 with .338 | 225gr | Swift A-Frame 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, 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% | 55,811 psi | 89% | 2493 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 54,172 psi | 87% | 2516 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 53,403 psi | 86% | 2510 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 56,014 psi | 90% | 2575 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 53,780 psi | 86% | 2503 fps | 95.8% |
| Accurate 4064 | <<locked>> | 94% | 53,272 psi | 85% | 2552 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 48,631 psi | 78% | 2562 fps | 98.5% |
| Accurate LT-30 | <<locked>> | 82% | 55,201 psi | 89% | 2441 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,622 psi | 89% | 2464 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 54,752 psi | 88% | 2582 fps | 99.8% |
| ADI AR 2208 | <<locked>> | 96% | 55,622 psi | 89% | 2579 fps | 99.6% |
| ADI AR 2219 | <<locked>> | 82% | 56,057 psi | 90% | 2552 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 54,012 psi | 87% | 2539 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 54,128 psi | 87% | 2520 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,724 psi | 89% | 2635 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 54,056 psi | 87% | 2684 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 55,187 psi | 88% | 2598 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,753 psi | 89% | 2497 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,927 psi | 90% | 2618 fps | 99.7% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,906 psi | 77% | 2566 fps | 98.6% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 55,535 psi | 89% | 2707 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,997 psi | 55% | 2320 fps | 96.2% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,404 psi | 87% | 2441 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 54,389 psi | 87% | 2595 fps | 99.3% |
| Bofors RP3 | <<locked>> | 96% | 55,463 psi | 89% | 2612 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 56,159 psi | 90% | 2579 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 88% | 56,072 psi | 90% | 2526 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 56,434 psi | 90% | 2615 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 54,766 psi | 88% | 2657 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 84% | 54,853 psi | 88% | 2536 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,869 psi | 90% | 2562 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 53,287 psi | 85% | 2572 fps | 98.7% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 52,199 psi | 84% | 2612 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 90% | 55,230 psi | 89% | 2592 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,048 psi | 71% | 2457 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 54,085 psi | 87% | 2621 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 53,345 psi | 86% | 2641 fps | 96.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,012 psi | 56% | 1529 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 53,156 psi | 85% | 2546 fps | 99.8% |
| IMR 3031 | <<locked>> | 90% | 54,766 psi | 88% | 2575 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,332 psi | 89% | 2566 fps | 99.6% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,651 psi | 89% | 2543 fps | 97.1% |
| IMR 4198 | <<locked>> | 84% | 55,854 psi | 90% | 2457 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 54,853 psi | 88% | 2562 fps | 96.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,398 psi | 74% | 2510 fps | 98.2% |
| IMR 4895 | <<locked>> | 92% | 53,809 psi | 86% | 2598 fps | 99.8% |
| IMR 8208 XBR | <<locked>> | 88% | 54,012 psi | 87% | 2539 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 54,186 psi | 87% | 2530 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 54,128 psi | 87% | 2562 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 54,737 psi | 88% | 2516 fps | 99.8% |
| Lovex S062 | <<locked>> | 94% | 54,752 psi | 88% | 2562 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 53,679 psi | 86% | 2552 fps | 98.1% |
| Lovex S070ᴾ | <<locked>> | 100% | 50,879 psi | 82% | 2533 fps | 96.5% |
| Norma 201 | <<locked>> | 90% | 53,461 psi | 86% | 2530 fps | 100% |
| Norma 202 | <<locked>> | 90% | 53,867 psi | 86% | 2536 fps | 100% |
| Norma 203B | <<locked>> | 94% | 55,027 psi | 88% | 2605 fps | 99.8% |
| Norma URPᴾ | <<locked>> | 100% | 48,298 psi | 77% | 2552 fps | 98.4% |
| Ramshot Big Game | <<locked>> | 94% | 55,535 psi | 89% | 2631 fps | 99.8% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 47,732 psi | 77% | 2546 fps | 96.6% |
| Ramshot TAC | <<locked>> | 88% | 54,331 psi | 87% | 2556 fps | 98.3% |
| Ramshot Wild Boar | <<locked>> | 88% | 53,592 psi | 86% | 2572 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 86% | 55,230 psi | 89% | 2543 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,404 psi | 57% | 1568 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 53,708 psi | 86% | 2523 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 54,085 psi | 87% | 2559 fps | 97.5% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 56,057 psi | 90% | 2677 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 55,550 psi | 89% | 2710 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 48,327 psi | 77% | 2582 fps | 98.2% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 49,168 psi | 79% | 2602 fps | 97.8% |
| Rottweil R 901 | <<locked>> | 88% | 54,752 psi | 88% | 2520 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 53,853 psi | 86% | 2530 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 55,317 psi | 89% | 2602 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 56,159 psi | 90% | 2579 fps | 96.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 53,679 psi | 86% | 2552 fps | 98.1% |
| Shooters World Match Rifle | <<locked>> | 90% | 54,128 psi | 87% | 2562 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 54,752 psi | 88% | 2562 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 50,879 psi | 82% | 2533 fps | 96.5% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 53,316 psi | 85% | 2497 fps | 99.9% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 53,621 psi | 86% | 2615 fps | 99.7% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 53,156 psi | 85% | 2474 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 56,086 psi | 90% | 2582 fps | 98.9% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 53,243 psi | 85% | 2559 fps | 99.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,666 psi | 89% | 2480 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 55,274 psi | 89% | 2477 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 54,186 psi | 87% | 2510 fps | 96.8% |
| Somchem S321 | <<locked>> | 86% | 55,129 psi | 88% | 2572 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,534 psi | 87% | 2477 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,550 psi | 89% | 2575 fps | 99.8% |
| Somchem S355 | <<locked>> | 98% | 55,666 psi | 89% | 2598 fps | 99.9% |
| Somchem S365ᴾ | <<locked>> | 100% | 43,178 psi | 69% | 2510 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 86% | 55,434 psi | 89% | 2448 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,651 psi | 89% | 2467 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 53,171 psi | 85% | 2500 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 54,389 psi | 87% | 2516 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 53,954 psi | 87% | 2539 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,995 psi | 82% | 2556 fps | 98.7% |
| Vihtavuori N530 | <<locked>> | 88% | 54,607 psi | 88% | 2539 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 55,883 psi | 90% | 2559 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,951 psi | 80% | 2559 fps | 98.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,085 psi | 58% | 2385 fps | 96.3% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 52,011 psi | 83% | 2543 fps | 99.8% |
| Winchester 748 | <<locked>> | 88% | 53,940 psi | 86% | 2582 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 52,199 psi | 84% | 2612 fps | 96.7% |
| Winchester StaBALL Match | <<locked>> | 92% | 56,333 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% | 43,627 psi | 70% | 2329 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,471 psi | 76% | 2425 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,274 psi | 58% | 2257 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,627 psi | 68% | 2385 fps | 99.9% |
| Accurate 2700 | <<locked>> | 90% | 50,546 psi | 81% | 2457 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 34,301 psi | 55% | 2244 fps | 99.6% |
| Accurate 4350 | <<locked>> | 92% | 36,912 psi | 59% | 2359 fps | 95.8% |
| Accurate LT-30 | <<locked>> | 80% | 51,822 psi | 83% | 2398 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,214 psi | 84% | 2421 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,074 psi | 64% | 2343 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 80% | 34,171 psi | 55% | 2208 fps | 95.3% |
| ADI AR 2219 | <<locked>> | 80% | 52,518 psi | 84% | 2507 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,090 psi | 67% | 2356 fps | 99.2% |
| Alliant AR-Comp | <<locked>> | 80% | 41,684 psi | 67% | 2352 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,863 psi | 78% | 2533 fps | 99.6% |
| Alliant Power Pro 2000-MR | 51 gr | 80% | 36,056 psi | 58% | 2352 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,344 psi | 53% | 2228 fps | 97% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,284 psi | 79% | 2415 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,955 psi | 58% | 2283 fps | 96.2% |
| Alliant Reloder-16 | <<locked>> | 90% | 35,505 psi | 57% | 2320 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 84% | 32,822 psi | 53% | 2287 fps | 96% |
| Alliant Reloder-23 | <<locked>> | 98% | 31,995 psi | 51% | 2267 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,024 psi | 82% | 2402 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,044 psi | 63% | 2343 fps | 96.5% |
| Bofors RP3 | <<locked>> | 80% | 32,648 psi | 52% | 2224 fps | 96.9% |
| Bofors RP7 | <<locked>> | 96% | 49,545 psi | 79% | 2480 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,135 psi | 71% | 2349 fps | 99.7% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,277 psi | 65% | 2372 fps | 99.3% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,208 psi | 71% | 2493 fps | 98.3% |
| Hodgdon H322 | <<locked>> | 80% | 48,196 psi | 77% | 2448 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,805 psi | 78% | 2467 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 38,537 psi | 62% | 2326 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 96% | 45,701 psi | 73% | 2507 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 40,408 psi | 65% | 2356 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 30,472 psi | 49% | 2178 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,361 psi | 58% | 2326 fps | 97.9% |
| Hodgdon Superformance | <<locked>> | 98% | 49,777 psi | 80% | 2585 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,904 psi | 42% | 1362 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,957 psi | 62% | 2313 fps | 98.1% |
| IMR 3031 | <<locked>> | 80% | 39,595 psi | 63% | 2356 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,824 psi | 57% | 2238 fps | 96.2% |
| IMR 4166 Enduron | <<locked>> | 86% | 46,282 psi | 74% | 2402 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 49,879 psi | 80% | 2382 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 48,530 psi | 78% | 2467 fps | 95.6% |
| IMR 4831 | <<locked>> | 92% | 35,737 psi | 57% | 2316 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 36,796 psi | 59% | 2310 fps | 97.2% |
| IMR 8208 XBR | <<locked>> | 80% | 42,090 psi | 67% | 2356 fps | 99.2% |
| Lovex D073.5 | <<locked>> | 80% | 47,268 psi | 76% | 2431 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 38,711 psi | 62% | 2329 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 40,640 psi | 65% | 2293 fps | 98% |
| Lovex S062 | <<locked>> | 80% | 35,578 psi | 57% | 2244 fps | 98% |
| Lovex S065 | <<locked>> | 92% | 42,119 psi | 68% | 2369 fps | 95.6% |
| Lovex S070 | <<locked>> | 96% | 45,092 psi | 72% | 2441 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 39,392 psi | 63% | 2306 fps | 98.8% |
| Norma 202 | <<locked>> | 80% | 39,363 psi | 63% | 2316 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 35,346 psi | 57% | 2274 fps | 96.7% |
| Norma URP | <<locked>> | 92% | 37,507 psi | 60% | 2359 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 34,664 psi | 56% | 2277 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 96% | 41,959 psi | 67% | 2448 fps | 95% |
| Ramshot TAC | <<locked>> | 80% | 42,032 psi | 67% | 2356 fps | 95.8% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,147 psi | 66% | 2375 fps | 98.1% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,411 psi | 73% | 2398 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,353 psi | 42% | 1398 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,355 psi | 76% | 2434 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 44,425 psi | 71% | 2408 fps | 95.4% |
| ReloadSwiss RS 52 | 49.5 gr | 80% | 37,217 psi | 60% | 2369 fps | 96.6% |
| ReloadSwiss RS 60 | 50.3 gr | 80% | 30,763 psi | 49% | 2244 fps | 97.7% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 36,811 psi | 59% | 2372 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 94% | 40,306 psi | 65% | 2438 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 43,149 psi | 69% | 2346 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 37,463 psi | 60% | 2264 fps | 98.4% |
| Rottweil R 903 | <<locked>> | 80% | 30,806 psi | 49% | 2175 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 96% | 49,545 psi | 79% | 2480 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 92% | 42,119 psi | 68% | 2369 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,711 psi | 62% | 2329 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 35,578 psi | 57% | 2244 fps | 98% |
| Shooters World SW4350 | <<locked>> | 96% | 45,092 psi | 72% | 2441 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,777 psi | 80% | 2448 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,923 psi | 51% | 2221 fps | 95.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,038 psi | 80% | 2431 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,987 psi | 64% | 2326 fps | 95.9% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,638 psi | 62% | 2316 fps | 97.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,930 psi | 66% | 2270 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,736 psi | 54% | 2152 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 47,384 psi | 76% | 2415 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 45,310 psi | 73% | 2428 fps | 99.7% |
| Somchem S335 | <<locked>> | 80% | 40,495 psi | 65% | 2277 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,813 psi | 64% | 2329 fps | 97.7% |
| Somchem S355 | <<locked>> | 80% | 31,923 psi | 51% | 2188 fps | 96% |
| Somchem S365 | <<locked>> | 86% | 27,717 psi | 44% | 2165 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 46,340 psi | 74% | 2329 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,118 psi | 66% | 2270 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,492 psi | 59% | 2254 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,304 psi | 60% | 2260 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 80% | 30,197 psi | 48% | 2133 fps | 96.9% |
| Vihtavuori N160 | <<locked>> | 90% | 36,956 psi | 59% | 2316 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 41,974 psi | 67% | 2349 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 80% | 35,926 psi | 58% | 2251 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 90% | 36,201 psi | 58% | 2316 fps | 95% |
| Vihtavuori N555 | <<locked>> | 98% | 33,968 psi | 54% | 2339 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 30,734 psi | 49% | 2152 fps | 95.2% |
| Winchester 748 | <<locked>> | 80% | 41,263 psi | 66% | 2392 fps | 99.6% |
| Winchester 760 | <<locked>> | 96% | 45,963 psi | 74% | 2510 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,782 psi | 61% | 2316 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 104 powders for 8.5 x 63 loaded with the .338 | 225gr | Swift A-Frame. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,710 fps; across all powders the maximum-charge window runs from 1,529 fps to 2,710 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 55–90 %, leaving at least 10 % headroom. The 225.0 gr projectile in 0.338" calls for a 1:16.5 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 63 with the .338 | 225gr | Swift A-Frame 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.