Load Specifications
Bullet:.338 | 275gr | Swift A-Frame
Bullet Manufacturer:Swift
Bullet Weight:275 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338-06 A-Square load data
Case Length (l3):2.494"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:69 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:63,091 psi
Recommended Twist Rate:1:14.5
Load data in caliber .338-06 A-Square with .338 | 275gr | Swift A-Frame bullet and 109 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 Ramshot Big Game.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 88% | 55,724 psi | 88% | 2172 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 53,954 psi | 86% | 2198 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 56,637 psi | 90% | 2228 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 55,521 psi | 88% | 2251 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 53,664 psi | 85% | 2195 fps | 96.9% |
| Accurate 4064 | <<locked>> | 96% | 56,275 psi | 89% | 2267 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 48,370 psi | 77% | 2254 fps | 99.2% |
| Accurate LT-30 | <<locked>> | 82% | 55,201 psi | 87% | 2126 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,622 psi | 88% | 2146 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 54,447 psi | 86% | 2257 fps | 100% |
| ADI AR 2208 | <<locked>> | 96% | 55,259 psi | 88% | 2254 fps | 99.9% |
| ADI AR 2219 | <<locked>> | 82% | 56,144 psi | 89% | 2228 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 53,780 psi | 85% | 2221 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 53,998 psi | 86% | 2195 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,579 psi | 88% | 2303 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 53,882 psi | 85% | 2359 fps | 99.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 54,911 psi | 87% | 2277 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,492 psi | 88% | 2172 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,796 psi | 88% | 2297 fps | 100% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,863 psi | 76% | 2257 fps | 99.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 55,056 psi | 87% | 2375 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,837 psi | 54% | 2051 fps | 97.7% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 36,825 psi | 58% | 2156 fps | 96.2% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,273 psi | 86% | 2133 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 54,128 psi | 86% | 2277 fps | 99.7% |
| Bofors RP3 | <<locked>> | 96% | 55,259 psi | 88% | 2290 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 55,738 psi | 88% | 2260 fps | 97.6% |
| Hodgdon Benchmark | <<locked>> | 88% | 56,086 psi | 89% | 2208 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 56,173 psi | 89% | 2290 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 54,288 psi | 86% | 2326 fps | 99.9% |
| Hodgdon H322 | <<locked>> | 84% | 54,694 psi | 87% | 2215 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,535 psi | 88% | 2238 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 56,666 psi | 90% | 2300 fps | 99.6% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 51,750 psi | 82% | 2293 fps | 97.7% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 56,608 psi | 90% | 2306 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 90% | 54,955 psi | 87% | 2267 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 43,830 psi | 69% | 2159 fps | 99.6% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 53,664 psi | 85% | 2297 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 52,750 psi | 84% | 2323 fps | 97.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,940 psi | 55% | 1312 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,449 psi | 89% | 2270 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 54,563 psi | 86% | 2247 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,100 psi | 87% | 2244 fps | 99.9% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,564 psi | 88% | 2231 fps | 98% |
| IMR 4198 | <<locked>> | 84% | 56,057 psi | 89% | 2139 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 49,023 psi | 78% | 2198 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 98% | 54,650 psi | 87% | 2247 fps | 97.8% |
| IMR 4831ᴾ | <<locked>> | 100% | 45,905 psi | 73% | 2205 fps | 99% |
| IMR 4895 | <<locked>> | 92% | 53,432 psi | 85% | 2277 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 53,780 psi | 85% | 2221 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 53,969 psi | 86% | 2211 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 53,679 psi | 85% | 2241 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 54,694 psi | 87% | 2201 fps | 100% |
| Lovex S062 | <<locked>> | 94% | 54,592 psi | 87% | 2241 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 53,403 psi | 85% | 2241 fps | 98.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 50,575 psi | 80% | 2224 fps | 97.5% |
| Norma 201 | <<locked>> | 92% | 56,594 psi | 90% | 2251 fps | 100% |
| Norma 202 | <<locked>> | 90% | 53,722 psi | 85% | 2218 fps | 100% |
| Norma 203B | <<locked>> | 94% | 54,940 psi | 87% | 2283 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 47,979 psi | 76% | 2244 fps | 99.1% |
| Ramshot Big Game | <<locked>> | 94% | 54,926 psi | 87% | 2306 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 47,195 psi | 75% | 2241 fps | 97.6% |
| Ramshot TAC | <<locked>> | 88% | 54,186 psi | 86% | 2241 fps | 99% |
| Ramshot Wild Boar | <<locked>> | 90% | 56,811 psi | 90% | 2293 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 86% | 54,868 psi | 87% | 2224 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,520 psi | 56% | 1348 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 53,708 psi | 85% | 2208 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 53,809 psi | 85% | 2247 fps | 98.3% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,985 psi | 89% | 2349 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 55,143 psi | 87% | 2375 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 47,863 psi | 76% | 2270 fps | 99% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 48,602 psi | 77% | 2287 fps | 98.7% |
| Rottweil R 901 | <<locked>> | 88% | 54,534 psi | 86% | 2198 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 53,809 psi | 85% | 2211 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 54,781 psi | 87% | 2277 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 55,738 psi | 88% | 2260 fps | 97.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 53,403 psi | 85% | 2241 fps | 98.8% |
| Shooters World Match Rifle | <<locked>> | 90% | 53,679 psi | 85% | 2241 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 54,592 psi | 87% | 2241 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 50,575 psi | 80% | 2224 fps | 97.5% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 57,029 psi | 90% | 2224 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 56,130 psi | 89% | 2238 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 56,782 psi | 90% | 2333 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,536 psi | 90% | 2188 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 55,753 psi | 88% | 2260 fps | 99.5% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 56,463 psi | 89% | 2280 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,550 psi | 88% | 2165 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 54,911 psi | 87% | 2162 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 53,925 psi | 85% | 2205 fps | 97.7% |
| Somchem S321 | <<locked>> | 86% | 54,926 psi | 87% | 2251 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,621 psi | 87% | 2165 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,376 psi | 88% | 2257 fps | 100% |
| Somchem S355 | <<locked>> | 98% | 55,506 psi | 88% | 2277 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 42,830 psi | 68% | 2208 fps | 100% |
| Vihtavuori N130 | <<locked>> | 86% | 55,463 psi | 88% | 2136 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,535 psi | 88% | 2152 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 56,420 psi | 89% | 2218 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 54,027 psi | 86% | 2198 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 56,942 psi | 90% | 2257 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,720 psi | 80% | 2244 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 88% | 54,317 psi | 86% | 2221 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 55,680 psi | 88% | 2238 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,661 psi | 79% | 2251 fps | 99.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 35,882 psi | 57% | 2106 fps | 97.6% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 51,488 psi | 82% | 2231 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 53,664 psi | 85% | 2260 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 51,750 psi | 82% | 2293 fps | 97.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 29,994 psi | 48% | 2028 fps | 96.5% |
| Winchester StaBALL Match | <<locked>> | 92% | 56,173 psi | 89% | 2290 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 80% | 43,801 psi | 69% | 2034 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,355 psi | 75% | 2119 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,085 psi | 57% | 1975 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,554 psi | 67% | 2093 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 47,210 psi | 75% | 2113 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 34,171 psi | 54% | 1969 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 31,981 psi | 51% | 1988 fps | 95.6% |
| Accurate LT-30 | <<locked>> | 80% | 51,866 psi | 82% | 2087 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,272 psi | 83% | 2110 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,045 psi | 63% | 2057 fps | 98.8% |
| ADI AR 2208 | <<locked>> | 80% | 34,098 psi | 54% | 1939 fps | 96.7% |
| ADI AR 2219 | <<locked>> | 80% | 52,315 psi | 83% | 2188 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,061 psi | 67% | 2064 fps | 99.7% |
| Alliant AR-Comp | <<locked>> | 80% | 41,539 psi | 66% | 2054 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,849 psi | 77% | 2218 fps | 100% |
| Alliant Power Pro 2000-MR | 42.8 gr | 80% | 35,984 psi | 57% | 2073 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,489 psi | 53% | 1962 fps | 98.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,211 psi | 78% | 2103 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,940 psi | 57% | 2005 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 88% | 33,417 psi | 53% | 2005 fps | 95.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 28,790 psi | 46% | 1929 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 28,282 psi | 45% | 1923 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 34,592 psi | 55% | 2110 fps | 95.2% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,908 psi | 81% | 2093 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,928 psi | 62% | 2060 fps | 97.7% |
| Bofors RP3 | <<locked>> | 80% | 32,779 psi | 52% | 1962 fps | 98.2% |
| Bofors RP7 | <<locked>> | 92% | 43,729 psi | 69% | 2100 fps | 95.1% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,106 psi | 70% | 2057 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,176 psi | 64% | 2080 fps | 99.8% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,063 psi | 70% | 2188 fps | 99.1% |
| Hodgdon H322 | <<locked>> | 80% | 48,167 psi | 76% | 2139 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,762 psi | 77% | 2162 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 33,750 psi | 53% | 1962 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 94% | 42,670 psi | 68% | 2165 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 94% | 47,050 psi | 75% | 2182 fps | 95.2% |
| Hodgdon H4895 | <<locked>> | 80% | 40,335 psi | 64% | 2067 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 28,572 psi | 45% | 1880 fps | 95.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,158 psi | 57% | 2044 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 96% | 45,934 psi | 73% | 2228 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,194 psi | 42% | 1175 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 38,899 psi | 62% | 2031 fps | 98.9% |
| IMR 3031 | <<locked>> | 80% | 39,697 psi | 63% | 2064 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,766 psi | 57% | 1965 fps | 97.5% |
| IMR 4166 Enduron | <<locked>> | 84% | 43,352 psi | 69% | 2064 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 49,966 psi | 79% | 2070 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 43,453 psi | 69% | 2119 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 90% | 42,946 psi | 68% | 2087 fps | 95.4% |
| IMR 4831 | <<locked>> | 88% | 31,314 psi | 50% | 1959 fps | 95.3% |
| IMR 4895 | <<locked>> | 80% | 36,753 psi | 58% | 2031 fps | 98.3% |
| IMR 8208 XBR | <<locked>> | 80% | 42,061 psi | 67% | 2064 fps | 99.7% |
| Lovex D073.5 | <<locked>> | 80% | 47,021 psi | 75% | 2126 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 38,493 psi | 61% | 2041 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 40,611 psi | 64% | 2008 fps | 98.9% |
| Lovex S062 | <<locked>> | 80% | 35,563 psi | 56% | 1972 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 37,289 psi | 59% | 2005 fps | 95.5% |
| Lovex S070 | <<locked>> | 92% | 39,566 psi | 63% | 2064 fps | 95% |
| Norma 201 | <<locked>> | 80% | 39,247 psi | 62% | 2021 fps | 99.5% |
| Norma 202 | <<locked>> | 80% | 39,523 psi | 63% | 2031 fps | 100% |
| Norma 203B | <<locked>> | 80% | 35,331 psi | 56% | 1998 fps | 97.9% |
| Norma URP | <<locked>> | 88% | 33,127 psi | 53% | 1998 fps | 95.7% |
| Ramshot Big Game | 42.8 gr | 80% | 34,592 psi | 55% | 2005 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 94% | 39,131 psi | 62% | 2110 fps | 95.5% |
| Ramshot TAC | <<locked>> | 80% | 41,974 psi | 67% | 2070 fps | 97% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,147 psi | 65% | 2087 fps | 98.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,382 psi | 72% | 2103 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,310 psi | 42% | 1201 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,166 psi | 75% | 2126 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 38,986 psi | 62% | 2031 fps | 95.2% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 37,043 psi | 59% | 2080 fps | 97.8% |
| ReloadSwiss RS 60 | 42.2 gr | 80% | 30,661 psi | 49% | 1982 fps | 98.9% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 32,285 psi | 51% | 2008 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 37,550 psi | 60% | 2103 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 43,207 psi | 68% | 2054 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 37,521 psi | 59% | 1985 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 30,850 psi | 49% | 1916 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 92% | 43,729 psi | 69% | 2100 fps | 95.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 37,289 psi | 59% | 2005 fps | 95.5% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,493 psi | 61% | 2041 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 35,563 psi | 56% | 1972 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 92% | 39,566 psi | 63% | 2064 fps | 95% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,676 psi | 79% | 2139 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,808 psi | 84% | 2201 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,807 psi | 50% | 1955 fps | 96.6% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,024 psi | 79% | 2119 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,813 psi | 63% | 2044 fps | 97.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,479 psi | 61% | 2034 fps | 98.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,872 psi | 65% | 1985 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,692 psi | 53% | 1883 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 92% | 41,220 psi | 65% | 2037 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 45,165 psi | 72% | 2129 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 40,321 psi | 64% | 1988 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,711 psi | 63% | 2047 fps | 98.6% |
| Somchem S355 | <<locked>> | 80% | 31,792 psi | 50% | 1923 fps | 97.3% |
| Somchem S365 | <<locked>> | 82% | 24,540 psi | 39% | 1831 fps | 95.3% |
| Vihtavuori N130 | <<locked>> | 80% | 46,282 psi | 73% | 2031 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,075 psi | 65% | 1982 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,506 psi | 58% | 1972 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,333 psi | 59% | 1982 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 30,226 psi | 48% | 1877 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 32,430 psi | 51% | 1952 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 42,148 psi | 67% | 2064 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 35,781 psi | 57% | 1972 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 33,779 psi | 54% | 1998 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 94% | 29,747 psi | 47% | 1982 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 27,093 psi | 43% | 1818 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 41,133 psi | 65% | 2096 fps | 99.9% |
| Winchester 760 | <<locked>> | 94% | 42,670 psi | 68% | 2165 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 98% | 28,311 psi | 45% | 1978 fps | 95.3% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,724 psi | 60% | 2037 fps | 98.8% |
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 109 powders for .338-06 A-Square loaded with the .338 | 275gr | Swift A-Frame. Alliant Reloder-17 delivers the highest muzzle velocity at 2,375 fps; across all powders the maximum-charge window runs from 1,312 fps to 2,375 fps. Accurate 4350 gives the best case fill at 100 %, and 109 of the 109 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (435 MPa), the top charges use 48–90 %, 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 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, Ramshot Big Game rank at the top here: for .338-06 A-Square 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.