Load Specifications
Bullet:.338 | 250gr | Swift A-Frame
Bullet Manufacturer:Swift
Bullet Weight:250 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:1:15.5
Load data in caliber 8.5 x 63 with .338 | 250gr | 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, 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% | 2339 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 53,751 psi | 86% | 2365 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 53,417 psi | 86% | 2362 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 55,405 psi | 89% | 2421 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 53,127 psi | 85% | 2362 fps | 96.8% |
| Accurate 4064 | <<locked>> | 92% | 53,185 psi | 85% | 2402 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 52,228 psi | 84% | 2470 fps | 99.5% |
| ADI AR 2206H | <<locked>> | 88% | 54,375 psi | 87% | 2431 fps | 100% |
| ADI AR 2208 | <<locked>> | 94% | 55,027 psi | 88% | 2428 fps | 99.9% |
| ADI Benchmark 8208 | <<locked>> | 86% | 53,476 psi | 86% | 2388 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 54,012 psi | 87% | 2365 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 55,376 psi | 89% | 2480 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 53,447 psi | 86% | 2533 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 94% | 54,984 psi | 88% | 2451 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 55,114 psi | 88% | 2339 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 55,593 psi | 89% | 2470 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 50,836 psi | 82% | 2474 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 98% | 55,129 psi | 88% | 2556 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,201 psi | 58% | 2251 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 39,871 psi | 64% | 2379 fps | 97.2% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 53,751 psi | 86% | 2444 fps | 99.7% |
| Bofors RP3 | <<locked>> | 94% | 55,216 psi | 89% | 2461 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 55,651 psi | 89% | 2434 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 86% | 55,274 psi | 89% | 2372 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 55,999 psi | 90% | 2461 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 84% | 54,143 psi | 87% | 2500 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 82% | 54,041 psi | 87% | 2379 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 54,926 psi | 88% | 2405 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 52,895 psi | 85% | 2428 fps | 99.3% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 55,361 psi | 89% | 2516 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 96% | 53,156 psi | 85% | 2438 fps | 96.5% |
| Hodgdon H4895 | <<locked>> | 88% | 54,940 psi | 88% | 2441 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 46,949 psi | 75% | 2369 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 53,577 psi | 86% | 2467 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 52,591 psi | 84% | 2500 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,418 psi | 57% | 1444 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 55,912 psi | 90% | 2438 fps | 100% |
| IMR 3031 | <<locked>> | 88% | 54,433 psi | 87% | 2418 fps | 100% |
| IMR 4064 | <<locked>> | 92% | 54,708 psi | 88% | 2415 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 90% | 54,897 psi | 88% | 2398 fps | 97.9% |
| IMR 4198 | <<locked>> | 82% | 55,361 psi | 89% | 2303 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 52,228 psi | 84% | 2411 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 96% | 54,259 psi | 87% | 2418 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 49,472 psi | 79% | 2418 fps | 99.3% |
| IMR 4895 | <<locked>> | 90% | 53,461 psi | 86% | 2448 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 53,476 psi | 86% | 2388 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 53,345 psi | 86% | 2375 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 53,606 psi | 86% | 2408 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 54,244 psi | 87% | 2369 fps | 100% |
| Lovex S062 | <<locked>> | 92% | 54,288 psi | 87% | 2411 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 53,301 psi | 85% | 2411 fps | 98.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 54,041 psi | 87% | 2441 fps | 98.1% |
| Norma 201 | <<locked>> | 88% | 52,939 psi | 85% | 2382 fps | 100% |
| Norma 202 | <<locked>> | 88% | 53,461 psi | 86% | 2385 fps | 100% |
| Norma 203B | <<locked>> | 92% | 54,752 psi | 88% | 2457 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 51,648 psi | 83% | 2464 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 92% | 55,230 psi | 89% | 2484 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 50,502 psi | 81% | 2457 fps | 98.2% |
| Ramshot TAC | <<locked>> | 86% | 53,664 psi | 86% | 2408 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 86% | 53,026 psi | 85% | 2421 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 84% | 54,302 psi | 87% | 2392 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,650 psi | 57% | 1473 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 52,953 psi | 85% | 2369 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 53,359 psi | 86% | 2411 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 55,854 psi | 90% | 2526 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 96% | 55,056 psi | 88% | 2556 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 51,779 psi | 83% | 2493 fps | 99.4% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 52,141 psi | 84% | 2516 fps | 99.2% |
| Rottweil R 901 | <<locked>> | 86% | 54,273 psi | 87% | 2365 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 53,403 psi | 86% | 2379 fps | 100% |
| Rottweil R 903 | <<locked>> | 96% | 55,085 psi | 88% | 2454 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 55,651 psi | 89% | 2434 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 98% | 53,301 psi | 85% | 2411 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 88% | 53,606 psi | 86% | 2408 fps | 100% |
| Shooters World Precision | <<locked>> | 92% | 54,288 psi | 87% | 2411 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 54,041 psi | 87% | 2441 fps | 98.1% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 56,173 psi | 90% | 2392 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 53,214 psi | 85% | 2464 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 56,072 psi | 90% | 2359 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 55,564 psi | 89% | 2434 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 55,985 psi | 90% | 2451 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 54,955 psi | 88% | 2329 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 94% | 54,752 psi | 88% | 2329 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 53,867 psi | 86% | 2372 fps | 97.7% |
| Somchem S321 | <<locked>> | 84% | 54,389 psi | 87% | 2418 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 53,983 psi | 87% | 2329 fps | 100% |
| Somchem S341 | <<locked>> | 88% | 54,882 psi | 88% | 2425 fps | 100% |
| Somchem S355 | <<locked>> | 96% | 55,564 psi | 89% | 2451 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 46,079 psi | 74% | 2418 fps | 100% |
| Vihtavuori N130 | <<locked>> | 84% | 54,810 psi | 88% | 2297 fps | 100% |
| Vihtavuori N133 | <<locked>> | 88% | 55,085 psi | 88% | 2316 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 56,420 psi | 90% | 2388 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 54,128 psi | 87% | 2369 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 53,534 psi | 86% | 2392 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 54,244 psi | 87% | 2457 fps | 99.6% |
| Vihtavuori N530 | <<locked>> | 86% | 53,795 psi | 86% | 2385 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 55,361 psi | 89% | 2405 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 53,258 psi | 85% | 2467 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 38,885 psi | 62% | 2316 fps | 98.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 54,781 psi | 88% | 2444 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 53,359 psi | 86% | 2428 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 55,680 psi | 89% | 2520 fps | 98.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,198 psi | 52% | 2238 fps | 97.6% |
| Winchester StaBALL Match | <<locked>> | 90% | 55,999 psi | 90% | 2461 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% | 46,137 psi | 74% | 2224 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 50,111 psi | 80% | 2320 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 38,638 psi | 62% | 2162 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 45,223 psi | 73% | 2287 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 46,760 psi | 75% | 2270 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 36,564 psi | 59% | 2159 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 32,387 psi | 52% | 2139 fps | 95.4% |
| ADI AR 2206H | <<locked>> | 80% | 42,308 psi | 68% | 2254 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 36,158 psi | 58% | 2129 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 44,353 psi | 71% | 2260 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 44,280 psi | 71% | 2247 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 51,735 psi | 83% | 2431 fps | 100% |
| Alliant Power Pro 2000-MR | 49.4 gr | 80% | 38,159 psi | 61% | 2274 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,578 psi | 57% | 2149 fps | 98.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 51,895 psi | 83% | 2300 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,116 psi | 61% | 2198 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,286 psi | 53% | 2152 fps | 95.6% |
| Alliant Reloder-17 | 48.7 gr | 80% | 30,589 psi | 49% | 2116 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 92% | 28,442 psi | 46% | 2067 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 96% | 34,766 psi | 56% | 2267 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 41,205 psi | 66% | 2254 fps | 98.1% |
| Bofors RP3 | <<locked>> | 80% | 34,896 psi | 56% | 2149 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 43,700 psi | 70% | 2257 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 46,238 psi | 74% | 2251 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 42,743 psi | 69% | 2277 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 47,108 psi | 76% | 2402 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 50,850 psi | 82% | 2339 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,517 psi | 83% | 2362 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 35,810 psi | 57% | 2149 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 92% | 42,815 psi | 69% | 2329 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 92% | 47,021 psi | 75% | 2349 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 42,670 psi | 68% | 2264 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,529 psi | 46% | 2018 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,566 psi | 62% | 2241 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 94% | 45,905 psi | 74% | 2395 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,194 psi | 42% | 1283 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 41,089 psi | 66% | 2224 fps | 99.2% |
| IMR 3031 | <<locked>> | 80% | 42,279 psi | 68% | 2257 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,942 psi | 61% | 2156 fps | 97.9% |
| IMR 4166 Enduron | <<locked>> | 82% | 42,844 psi | 69% | 2215 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 52,083 psi | 84% | 2264 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 46,180 psi | 74% | 2323 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 42,598 psi | 68% | 2241 fps | 95.2% |
| IMR 4831 | <<locked>> | 86% | 31,633 psi | 51% | 2106 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 39,044 psi | 63% | 2224 fps | 98.6% |
| IMR 8208 XBR | <<locked>> | 80% | 44,353 psi | 71% | 2260 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 50,038 psi | 80% | 2333 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 41,104 psi | 66% | 2234 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 42,757 psi | 69% | 2201 fps | 99.1% |
| Lovex S062 | <<locked>> | 80% | 37,797 psi | 61% | 2162 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 37,159 psi | 60% | 2152 fps | 95.3% |
| Lovex S070 | <<locked>> | 92% | 42,264 psi | 68% | 2264 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 41,495 psi | 67% | 2215 fps | 99.6% |
| Norma 202 | <<locked>> | 80% | 41,829 psi | 67% | 2221 fps | 100% |
| Norma 203B | <<locked>> | 80% | 37,507 psi | 60% | 2188 fps | 98.2% |
| Norma URP | <<locked>> | 86% | 33,156 psi | 53% | 2146 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 36,796 psi | 59% | 2198 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 92% | 39,175 psi | 63% | 2267 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 44,324 psi | 71% | 2267 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 43,540 psi | 70% | 2283 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 47,747 psi | 77% | 2300 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,498 psi | 42% | 1316 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 49,676 psi | 80% | 2326 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 38,827 psi | 62% | 2182 fps | 95% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,610 psi | 64% | 2283 fps | 98.3% |
| ReloadSwiss RS 60 | 48.7 gr | 80% | 32,547 psi | 52% | 2172 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 34,548 psi | 55% | 2201 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 37,347 psi | 60% | 2257 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 45,513 psi | 73% | 2247 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 39,682 psi | 64% | 2175 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 32,851 psi | 53% | 2100 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 43,700 psi | 70% | 2257 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 86% | 37,159 psi | 60% | 2152 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 41,104 psi | 66% | 2234 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 37,797 psi | 61% | 2162 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 92% | 42,264 psi | 68% | 2264 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 52,344 psi | 84% | 2343 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 33,794 psi | 54% | 2142 fps | 97.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 52,736 psi | 85% | 2320 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 42,380 psi | 68% | 2244 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 40,756 psi | 65% | 2228 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 43,062 psi | 69% | 2172 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,650 psi | 57% | 2064 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 41,321 psi | 66% | 2192 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 47,616 psi | 76% | 2326 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 42,554 psi | 68% | 2175 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 41,989 psi | 67% | 2241 fps | 98.9% |
| Somchem S355 | <<locked>> | 80% | 33,837 psi | 54% | 2106 fps | 97.7% |
| Somchem S365 | <<locked>> | 80% | 24,555 psi | 39% | 1962 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 48,631 psi | 78% | 2221 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 43,294 psi | 69% | 2169 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 38,856 psi | 62% | 2159 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,436 psi | 63% | 2165 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,126 psi | 52% | 2054 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 84% | 32,401 psi | 52% | 2096 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 44,367 psi | 71% | 2254 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 37,898 psi | 61% | 2159 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 33,968 psi | 54% | 2149 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 92% | 30,110 psi | 48% | 2129 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,514 psi | 46% | 1988 fps | 95.5% |
| Winchester 748 | <<locked>> | 80% | 43,801 psi | 70% | 2297 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 42,815 psi | 69% | 2329 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 96% | 28,413 psi | 46% | 2129 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,030 psi | 64% | 2231 fps | 99.1% |
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 | 250gr | Swift A-Frame. Alliant Reloder-17 delivers the highest muzzle velocity at 2,556 fps; across all powders the maximum-charge window runs from 1,444 fps to 2,556 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 250.0 gr projectile in 0.338" calls for a 1:15.5 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. Alliant Power Pro 2000-MR, Alliant Reloder-17, ReloadSwiss RS 60 rank at the top here: for 8.5 x 63 with the .338 | 250gr | 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.