Load Specifications
Bullet:.338 | 275gr | Swift A-Frame
Bullet Manufacturer:Swift
Bullet Weight:275 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:1:14.5
Load data in caliber 8.5 x 63 with .338 | 275gr | Swift A-Frame bullet and 102 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 60 and Alliant Power Pro 2000-MR.
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.
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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>> | 84% | 54,143 psi | 87% | 2195 fps | 100% |
| Accurate 2460 | <<locked>> | 82% | 56,115 psi | 90% | 2260 fps | 100% |
| Accurate 2495 | <<locked>> | 90% | 55,825 psi | 90% | 2254 fps | 100% |
| Accurate 2520 | <<locked>> | 84% | 54,186 psi | 87% | 2274 fps | 100% |
| Accurate 2700 | <<locked>> | 90% | 55,216 psi | 89% | 2267 fps | 98% |
| Accurate 3100ᴾ | <<locked>> | 100% | 39,204 psi | 63% | 2146 fps | 96.7% |
| Accurate 4064 | <<locked>> | 92% | 55,724 psi | 89% | 2297 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 55,114 psi | 88% | 2375 fps | 100% |
| ADI AR 2206H | <<locked>> | 86% | 53,200 psi | 85% | 2287 fps | 100% |
| ADI AR 2208 | <<locked>> | 92% | 53,940 psi | 86% | 2287 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 86% | 55,622 psi | 89% | 2283 fps | 100% |
| Alliant AR-Comp | <<locked>> | 86% | 56,405 psi | 90% | 2254 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 90% | 55,956 psi | 90% | 2431 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 92% | 53,853 psi | 86% | 2303 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 90% | 54,447 psi | 87% | 2323 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 53,258 psi | 85% | 2382 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 96% | 54,172 psi | 87% | 2411 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,869 psi | 61% | 2175 fps | 99.4% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,887 psi | 67% | 2303 fps | 98.7% |
| Baschieri & Pellagri 107 | <<locked>> | 88% | 56,347 psi | 90% | 2349 fps | 100% |
| Bofors RP3 | <<locked>> | 92% | 54,288 psi | 87% | 2320 fps | 100% |
| Bofors RP7 | <<locked>> | 96% | 54,563 psi | 87% | 2297 fps | 98.2% |
| Hodgdon Benchmark | <<locked>> | 84% | 54,201 psi | 87% | 2231 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 86% | 54,621 psi | 88% | 2313 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 82% | 53,098 psi | 85% | 2352 fps | 100% |
| Hodgdon H322 | <<locked>> | 82% | 56,333 psi | 90% | 2270 fps | 100% |
| Hodgdon H380 | <<locked>> | 92% | 55,477 psi | 89% | 2333 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 98% | 54,462 psi | 87% | 2379 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 96% | 55,651 psi | 89% | 2346 fps | 97.8% |
| Hodgdon H4895 | <<locked>> | 86% | 53,693 psi | 86% | 2293 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 49,356 psi | 79% | 2277 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 90% | 56,362 psi | 90% | 2365 fps | 100% |
| Hodgdon Superformance | <<locked>> | 98% | 55,376 psi | 89% | 2415 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,418 psi | 57% | 1358 fps | 100% |
| Hodgdon VARGET | <<locked>> | 88% | 54,984 psi | 88% | 2297 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 53,722 psi | 86% | 2277 fps | 100% |
| IMR 4064 | <<locked>> | 90% | 53,795 psi | 86% | 2274 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 88% | 53,708 psi | 86% | 2260 fps | 98.5% |
| IMR 4350ᴾ | <<locked>> | 100% | 54,476 psi | 87% | 2320 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 94% | 53,069 psi | 85% | 2280 fps | 98.3% |
| IMR 4831ᴾ | <<locked>> | 100% | 52,301 psi | 84% | 2329 fps | 99.9% |
| IMR 4895 | <<locked>> | 90% | 55,825 psi | 90% | 2346 fps | 100% |
| IMR 8208 XBR | <<locked>> | 86% | 55,622 psi | 89% | 2283 fps | 100% |
| Lovex D073.5 | <<locked>> | 82% | 55,811 psi | 89% | 2274 fps | 100% |
| Lovex D073.6 | <<locked>> | 88% | 56,202 psi | 90% | 2306 fps | 100% |
| Lovex S060 | <<locked>> | 88% | 56,246 psi | 90% | 2267 fps | 100% |
| Lovex S062 | <<locked>> | 90% | 53,519 psi | 86% | 2270 fps | 100% |
| Lovex S065 | <<locked>> | 98% | 55,622 psi | 89% | 2316 fps | 99.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 56,391 psi | 90% | 2346 fps | 99% |
| Norma 201 | <<locked>> | 88% | 55,448 psi | 89% | 2280 fps | 100% |
| Norma 202 | <<locked>> | 88% | 55,767 psi | 89% | 2280 fps | 100% |
| Norma 203B | <<locked>> | 90% | 53,621 psi | 86% | 2313 fps | 100% |
| Norma 204ᴾ | <<locked>> | 100% | 55,288 psi | 89% | 2365 fps | 97.2% |
| Norma MRPᴾ | <<locked>> | 100% | 42,250 psi | 68% | 2270 fps | 96.2% |
| Norma URPᴾ | <<locked>> | 100% | 54,186 psi | 87% | 2365 fps | 99.9% |
| Ramshot Big Game | <<locked>> | 90% | 53,998 psi | 87% | 2336 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 53,171 psi | 85% | 2369 fps | 99.2% |
| Ramshot TAC | <<locked>> | 86% | 55,883 psi | 90% | 2310 fps | 99.6% |
| Ramshot Wild Boar | <<locked>> | 86% | 55,390 psi | 89% | 2323 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 82% | 53,142 psi | 85% | 2251 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,984 psi | 58% | 1394 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 55,230 psi | 89% | 2267 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 55,651 psi | 89% | 2320 fps | 99.1% |
| ReloadSwiss RS 52 | <<locked>> | 88% | 54,824 psi | 88% | 2379 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 94% | 53,925 psi | 86% | 2405 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 54,694 psi | 88% | 2398 fps | 99.9% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 54,650 psi | 88% | 2425 fps | 99.8% |
| Rottweil R 901 | <<locked>> | 84% | 53,113 psi | 85% | 2221 fps | 100% |
| Rottweil R 902 | <<locked>> | 90% | 55,680 psi | 89% | 2277 fps | 100% |
| Rottweil R 903 | <<locked>> | 94% | 54,172 psi | 87% | 2310 fps | 100% |
| Rottweil R 907 | <<locked>> | 96% | 54,563 psi | 87% | 2297 fps | 98.2% |
| Shooters World Long Rifle | <<locked>> | 98% | 55,622 psi | 89% | 2316 fps | 99.5% |
| Shooters World Match Rifle | <<locked>> | 88% | 56,202 psi | 90% | 2306 fps | 100% |
| Shooters World Precision | <<locked>> | 90% | 53,519 psi | 86% | 2270 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 56,391 psi | 90% | 2346 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 94% | 55,898 psi | 90% | 2365 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 54,201 psi | 87% | 2290 fps | 99.7% |
| SNPE Vectan SP 9 | <<locked>> | 88% | 54,795 psi | 88% | 2306 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 86% | 53,708 psi | 86% | 2188 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 92% | 53,766 psi | 86% | 2188 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 98% | 56,057 psi | 90% | 2280 fps | 98.7% |
| Somchem S321 | <<locked>> | 82% | 53,330 psi | 86% | 2274 fps | 100% |
| Somchem S335 | <<locked>> | 88% | 56,333 psi | 90% | 2224 fps | 100% |
| Somchem S341 | <<locked>> | 86% | 53,824 psi | 86% | 2283 fps | 100% |
| Somchem S355 | <<locked>> | 94% | 54,491 psi | 87% | 2310 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 48,588 psi | 78% | 2326 fps | 100% |
| Somchem S385ᴾ | <<locked>> | 100% | 45,252 psi | 73% | 2231 fps | 96.5% |
| Vihtavuori N130 | <<locked>> | 82% | 53,650 psi | 86% | 2156 fps | 100% |
| Vihtavuori N133 | <<locked>> | 86% | 53,940 psi | 86% | 2175 fps | 100% |
| Vihtavuori N135 | <<locked>> | 90% | 55,463 psi | 89% | 2244 fps | 100% |
| Vihtavuori N140 | <<locked>> | 90% | 56,333 psi | 90% | 2260 fps | 100% |
| Vihtavuori N150 | <<locked>> | 96% | 55,985 psi | 90% | 2290 fps | 100% |
| Vihtavuori N160 | <<locked>> | 98% | 53,417 psi | 86% | 2320 fps | 99.8% |
| Vihtavuori N530 | <<locked>> | 86% | 56,043 psi | 90% | 2283 fps | 100% |
| Vihtavuori N540 | <<locked>> | 90% | 54,201 psi | 87% | 2260 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 55,970 psi | 90% | 2372 fps | 99.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,162 psi | 66% | 2234 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 98% | 53,679 psi | 86% | 2306 fps | 100% |
| Winchester 748 | <<locked>> | 86% | 56,086 psi | 90% | 2326 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 54,795 psi | 88% | 2382 fps | 98.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,924 psi | 54% | 2185 fps | 99.4% |
| Winchester StaBALL Match | <<locked>> | 88% | 54,650 psi | 88% | 2313 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% | 48,066 psi | 77% | 2123 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 52,446 psi | 84% | 2221 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 40,756 psi | 65% | 2070 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 47,529 psi | 76% | 2195 fps | 100% |
| Accurate 2700 | <<locked>> | 82% | 42,844 psi | 69% | 2096 fps | 95.5% |
| Accurate 3100 | <<locked>> | 96% | 34,301 psi | 55% | 2060 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 38,551 psi | 62% | 2070 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 30,037 psi | 48% | 1978 fps | 95.6% |
| ADI AR 2206H | <<locked>> | 80% | 44,063 psi | 71% | 2162 fps | 99.7% |
| ADI AR 2208 | <<locked>> | 80% | 37,536 psi | 60% | 2041 fps | 98.3% |
| ADI Benchmark 8208 | <<locked>> | 80% | 46,093 psi | 74% | 2162 fps | 100% |
| Alliant AR-Comp | <<locked>> | 80% | 46,557 psi | 75% | 2146 fps | 100% |
| Alliant Power Pro 2000-MR | 47.7 gr | 80% | 40,089 psi | 64% | 2195 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,159 psi | 60% | 2064 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,827 psi | 64% | 2113 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 82% | 30,864 psi | 49% | 1991 fps | 95.8% |
| Alliant Reloder-17 | 46.9 gr | 80% | 31,908 psi | 51% | 2044 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 88% | 26,600 psi | 43% | 1919 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 92% | 31,995 psi | 51% | 2103 fps | 95.3% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 43,323 psi | 69% | 2172 fps | 99.1% |
| Bofors RP3 | <<locked>> | 80% | 36,651 psi | 59% | 2067 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 40,176 psi | 64% | 2087 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 48,109 psi | 77% | 2152 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 44,976 psi | 72% | 2188 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 80% | 49,574 psi | 79% | 2306 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 80% | 52,881 psi | 85% | 2231 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 37,536 psi | 60% | 2070 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 88% | 39,465 psi | 63% | 2152 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 88% | 43,366 psi | 70% | 2172 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 44,440 psi | 71% | 2169 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 26,513 psi | 43% | 1867 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 40,350 psi | 65% | 2152 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 90% | 41,742 psi | 67% | 2211 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,542 psi | 43% | 1214 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 42,743 psi | 69% | 2133 fps | 99.8% |
| IMR 3031 | <<locked>> | 80% | 44,179 psi | 71% | 2159 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,421 psi | 63% | 2067 fps | 98.9% |
| IMR 4166 Enduron | <<locked>> | 80% | 41,974 psi | 67% | 2087 fps | 96.2% |
| IMR 4350 | <<locked>> | 90% | 40,234 psi | 65% | 2113 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 39,334 psi | 63% | 2070 fps | 95.3% |
| IMR 4831 | <<locked>> | 82% | 29,356 psi | 47% | 1949 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 40,770 psi | 65% | 2136 fps | 99.4% |
| IMR 8208 XBR | <<locked>> | 80% | 46,093 psi | 74% | 2162 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 52,199 psi | 84% | 2231 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 43,207 psi | 69% | 2146 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 44,193 psi | 71% | 2106 fps | 99.7% |
| Lovex S062 | <<locked>> | 80% | 39,334 psi | 63% | 2070 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 34,461 psi | 55% | 1991 fps | 95.5% |
| Lovex S070 | <<locked>> | 86% | 36,869 psi | 59% | 2054 fps | 95% |
| Norma 201 | <<locked>> | 80% | 43,381 psi | 70% | 2123 fps | 100% |
| Norma 202 | <<locked>> | 80% | 43,526 psi | 70% | 2126 fps | 100% |
| Norma 203B | <<locked>> | 80% | 39,189 psi | 63% | 2103 fps | 99.2% |
| Norma 204 | <<locked>> | 94% | 45,266 psi | 73% | 2224 fps | 95% |
| Norma MRP | <<locked>> | 98% | 39,494 psi | 63% | 2221 fps | 95.3% |
| Norma URP | <<locked>> | 82% | 30,676 psi | 49% | 1982 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 38,725 psi | 62% | 2119 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 36,143 psi | 58% | 2100 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 45,861 psi | 74% | 2175 fps | 98.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 45,484 psi | 73% | 2192 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 80% | 49,850 psi | 80% | 2208 fps | 99.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,905 psi | 43% | 1243 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 51,706 psi | 83% | 2224 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 37,942 psi | 61% | 2057 fps | 95.8% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 41,814 psi | 67% | 2198 fps | 99.3% |
| ReloadSwiss RS 60 | 46.9 gr | 80% | 33,982 psi | 54% | 2096 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 31,821 psi | 51% | 2034 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 34,243 psi | 55% | 2087 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 47,297 psi | 76% | 2149 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 41,176 psi | 66% | 2083 fps | 99.9% |
| Rottweil R 903 | <<locked>> | 80% | 34,679 psi | 56% | 2024 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 86% | 40,176 psi | 64% | 2087 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 82% | 34,461 psi | 55% | 1991 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 43,207 psi | 69% | 2146 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 39,334 psi | 63% | 2070 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 36,869 psi | 59% | 2054 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,447 psi | 57% | 2064 fps | 98.4% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 44,266 psi | 71% | 2156 fps | 98.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 42,612 psi | 68% | 2139 fps | 99.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 44,701 psi | 72% | 2077 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,159 psi | 60% | 1975 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 38,087 psi | 61% | 2028 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 49,966 psi | 80% | 2231 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 44,338 psi | 71% | 2080 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 44,106 psi | 71% | 2156 fps | 99.7% |
| Somchem S355 | <<locked>> | 80% | 35,549 psi | 57% | 2028 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 25,730 psi | 41% | 1900 fps | 97% |
| Somchem S385 | <<locked>> | 96% | 39,900 psi | 64% | 2146 fps | 95% |
| Vihtavuori N130 | <<locked>> | 80% | 50,444 psi | 81% | 2116 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 45,034 psi | 72% | 2067 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 40,683 psi | 65% | 2064 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 41,365 psi | 66% | 2077 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 33,794 psi | 54% | 1978 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 29,892 psi | 48% | 1936 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 46,195 psi | 74% | 2162 fps | 100% |
| Vihtavuori N540 | <<locked>> | 80% | 39,624 psi | 64% | 2070 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 31,401 psi | 50% | 1985 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 28,239 psi | 45% | 1978 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,892 psi | 48% | 1923 fps | 97.3% |
| Winchester 748 | <<locked>> | 80% | 45,716 psi | 73% | 2198 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 39,668 psi | 64% | 2156 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 92% | 26,324 psi | 42% | 1975 fps | 95.6% |
| Winchester StaBALL Match | <<locked>> | 80% | 42,076 psi | 67% | 2146 fps | 99.8% |
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 102 powders for 8.5 x 63 loaded with the .338 | 275gr | Swift A-Frame. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,431 fps; across all powders the maximum-charge window runs from 1,358 fps to 2,431 fps. Accurate 3100 gives the best case fill at 100 %, and 102 of the 102 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 275.0 gr projectile in 0.338" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, Alliant Reloder-16 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 Reloder-17, ReloadSwiss RS 60, Alliant Power Pro 2000-MR rank at the top here: for 8.5 x 63 with the .338 | 275gr | 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.