Load Specifications
Bullet:.338 | 275gr | Speer SSP
Bullet Manufacturer:Speer
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:1:16.0
Load data in caliber .338-06 A-Square with .338 | 275gr | Speer SSP bullet and 107 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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 86% | 53,983 psi | 86% | 2165 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 55,419 psi | 88% | 2224 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 55,027 psi | 87% | 2221 fps | 100% |
| Accurate 2520 | <<locked>> | 86% | 53,577 psi | 85% | 2241 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 55,071 psi | 87% | 2228 fps | 97.4% |
| Accurate 4064 | <<locked>> | 94% | 54,708 psi | 87% | 2260 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 49,937 psi | 79% | 2283 fps | 99.5% |
| Accurate LT-30 | <<locked>> | 82% | 56,434 psi | 89% | 2149 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 56,869 psi | 90% | 2172 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 56,159 psi | 89% | 2290 fps | 100% |
| ADI AR 2208 | <<locked>> | 96% | 56,811 psi | 90% | 2287 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 55,158 psi | 87% | 2247 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 55,782 psi | 88% | 2224 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 82% | 53,519 psi | 85% | 2290 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 55,288 psi | 88% | 2392 fps | 100% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 56,521 psi | 90% | 2306 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 56,927 psi | 90% | 2198 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 92% | 53,795 psi | 85% | 2283 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 49,197 psi | 78% | 2290 fps | 99.6% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 56,985 psi | 90% | 2411 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,751 psi | 55% | 2083 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 38,101 psi | 60% | 2198 fps | 97% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 55,477 psi | 88% | 2156 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 55,622 psi | 88% | 2306 fps | 99.9% |
| Bofors RP3 | <<locked>> | 96% | 56,913 psi | 90% | 2320 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 54,056 psi | 86% | 2254 fps | 97.5% |
| Hodgdon Benchmark | <<locked>> | 86% | 53,925 psi | 85% | 2195 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 88% | 54,085 psi | 86% | 2277 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 56,086 psi | 89% | 2359 fps | 100% |
| Hodgdon H322 | <<locked>> | 84% | 55,999 psi | 89% | 2241 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 56,942 psi | 90% | 2264 fps | 100% |
| Hodgdon H380 | <<locked>> | 94% | 54,694 psi | 87% | 2290 fps | 99.6% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 53,432 psi | 85% | 2329 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 98% | 54,882 psi | 87% | 2300 fps | 97.1% |
| Hodgdon H4895 | <<locked>> | 90% | 56,666 psi | 90% | 2300 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 45,426 psi | 72% | 2195 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 55,288 psi | 88% | 2326 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 54,578 psi | 87% | 2365 fps | 97.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,085 psi | 56% | 1325 fps | 100% |
| Hodgdon VARGET | <<locked>> | 90% | 54,375 psi | 86% | 2257 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 56,202 psi | 89% | 2277 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 56,405 psi | 89% | 2274 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 92% | 57,000 psi | 90% | 2264 fps | 98.4% |
| IMR 4198 | <<locked>> | 82% | 54,172 psi | 86% | 2129 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 50,589 psi | 80% | 2234 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 98% | 55,970 psi | 89% | 2280 fps | 98.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 47,659 psi | 76% | 2241 fps | 99.3% |
| IMR 4895 | <<locked>> | 92% | 55,129 psi | 87% | 2310 fps | 100% |
| IMR 8208 XBR | <<locked>> | 88% | 55,158 psi | 87% | 2247 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 55,347 psi | 88% | 2238 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 55,448 psi | 88% | 2270 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 55,999 psi | 89% | 2228 fps | 100% |
| Lovex S062 | <<locked>> | 94% | 55,956 psi | 89% | 2267 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 54,810 psi | 87% | 2270 fps | 99.1% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,243 psi | 83% | 2260 fps | 98% |
| Norma 201 | <<locked>> | 90% | 54,926 psi | 87% | 2244 fps | 100% |
| Norma 202 | <<locked>> | 90% | 55,216 psi | 88% | 2244 fps | 100% |
| Norma 203B | <<locked>> | 94% | 56,202 psi | 89% | 2313 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 49,719 psi | 79% | 2280 fps | 99.4% |
| Ramshot Big Game | <<locked>> | 94% | 56,768 psi | 90% | 2339 fps | 100% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,631 psi | 77% | 2274 fps | 98.1% |
| Ramshot TAC | <<locked>> | 88% | 55,579 psi | 88% | 2270 fps | 99.3% |
| Ramshot Wild Boar | <<locked>> | 88% | 55,013 psi | 87% | 2287 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 86% | 56,362 psi | 89% | 2254 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,665 psi | 57% | 1362 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 54,853 psi | 87% | 2231 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 55,172 psi | 87% | 2277 fps | 98.7% |
| ReloadSwiss RS 52 | <<locked>> | 90% | 53,925 psi | 85% | 2339 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 56,869 psi | 90% | 2408 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 49,487 psi | 78% | 2306 fps | 99.3% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 50,169 psi | 80% | 2326 fps | 99.1% |
| Rottweil R 901 | <<locked>> | 88% | 56,130 psi | 89% | 2228 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 55,172 psi | 87% | 2241 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 56,768 psi | 90% | 2310 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 54,056 psi | 86% | 2254 fps | 97.5% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 54,810 psi | 87% | 2270 fps | 99.1% |
| Shooters World Match Rifle | <<locked>> | 90% | 55,448 psi | 88% | 2270 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 55,956 psi | 89% | 2267 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 52,243 psi | 83% | 2260 fps | 98% |
| Shooters World Tactical Rifle | <<locked>> | 82% | 54,621 psi | 87% | 2211 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 54,868 psi | 87% | 2323 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 54,549 psi | 86% | 2178 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 88% | 53,925 psi | 85% | 2254 fps | 99.4% |
| SNPE Vectan SP 9 | <<locked>> | 90% | 54,375 psi | 86% | 2270 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 56,652 psi | 90% | 2188 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 56,536 psi | 90% | 2188 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 55,651 psi | 88% | 2238 fps | 98.2% |
| Somchem S321 | <<locked>> | 86% | 56,507 psi | 90% | 2280 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 55,970 psi | 89% | 2192 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 56,884 psi | 90% | 2287 fps | 100% |
| Somchem S355 | <<locked>> | 98% | 57,043 psi | 90% | 2306 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 44,396 psi | 70% | 2241 fps | 100% |
| Vihtavuori N130 | <<locked>> | 86% | 56,724 psi | 90% | 2159 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 56,695 psi | 90% | 2175 fps | 100% |
| Vihtavuori N135 | <<locked>> | 92% | 54,563 psi | 86% | 2208 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 55,709 psi | 88% | 2228 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 55,288 psi | 88% | 2251 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 52,112 psi | 83% | 2274 fps | 99.5% |
| Vihtavuori N530 | <<locked>> | 88% | 55,724 psi | 88% | 2247 fps | 100% |
| Vihtavuori N540 | <<locked>> | 92% | 53,606 psi | 85% | 2228 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 51,314 psi | 81% | 2283 fps | 99.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 37,130 psi | 59% | 2142 fps | 98.1% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,040 psi | 84% | 2264 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 55,361 psi | 88% | 2290 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 53,708 psi | 85% | 2333 fps | 98.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 30,951 psi | 49% | 2070 fps | 97.5% |
| Winchester StaBALL Match | <<locked>> | 90% | 54,012 psi | 86% | 2277 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% | 44,889 psi | 71% | 2057 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 48,849 psi | 77% | 2149 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 37,391 psi | 59% | 2001 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 43,743 psi | 69% | 2116 fps | 100% |
| Accurate 2700 | <<locked>> | 86% | 45,237 psi | 72% | 2100 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 35,389 psi | 56% | 1998 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 31,067 psi | 49% | 1982 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 53,185 psi | 84% | 2116 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 53,548 psi | 85% | 2136 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 41,162 psi | 65% | 2087 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 80% | 35,114 psi | 56% | 1972 fps | 97.2% |
| ADI Benchmark 8208 | <<locked>> | 80% | 43,221 psi | 69% | 2093 fps | 99.8% |
| Alliant AR-Comp | <<locked>> | 80% | 42,743 psi | 68% | 2077 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 50,299 psi | 80% | 2251 fps | 100% |
| Alliant Power Pro 2000-MR | 44.1 gr | 80% | 37,086 psi | 59% | 2110 fps | 97.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 34,345 psi | 54% | 1988 fps | 98.5% |
| Alliant Reloder-10x | <<locked>> | 80% | 50,691 psi | 80% | 2129 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 37,014 psi | 59% | 2037 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 86% | 32,242 psi | 51% | 1991 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 29,559 psi | 47% | 1959 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 92% | 27,572 psi | 44% | 1916 fps | 95.1% |
| Alliant Reloder-26 | <<locked>> | 96% | 33,388 psi | 53% | 2100 fps | 95.1% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 51,866 psi | 82% | 2116 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 39,900 psi | 63% | 2087 fps | 98.1% |
| Bofors RP3 | <<locked>> | 80% | 33,620 psi | 53% | 1988 fps | 98.5% |
| Bofors RP7 | <<locked>> | 90% | 42,250 psi | 67% | 2087 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 45,237 psi | 72% | 2083 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 41,481 psi | 66% | 2113 fps | 99.9% |
| Hodgdon CFE223 | <<locked>> | 80% | 45,469 psi | 72% | 2221 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 49,458 psi | 78% | 2165 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 49,893 psi | 79% | 2185 fps | 100% |
| Hodgdon H380 | <<locked>> | 80% | 34,780 psi | 55% | 1991 fps | 96% |
| Hodgdon H414 | <<locked>> | 92% | 41,379 psi | 66% | 2156 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 92% | 45,310 psi | 72% | 2169 fps | 95% |
| Hodgdon H4895 | <<locked>> | 80% | 41,495 psi | 66% | 2096 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 27,804 psi | 44% | 1873 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 37,202 psi | 59% | 2073 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 94% | 44,135 psi | 70% | 2215 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,063 psi | 41% | 1181 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,972 psi | 63% | 2060 fps | 99.2% |
| IMR 3031 | <<locked>> | 80% | 40,828 psi | 65% | 2090 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 36,840 psi | 58% | 1995 fps | 97.9% |
| IMR 4166 Enduron | <<locked>> | 82% | 41,698 psi | 66% | 2051 fps | 95.4% |
| IMR 4198 | <<locked>> | 80% | 50,908 psi | 81% | 2093 fps | 100% |
| IMR 4350 | <<locked>> | 96% | 44,657 psi | 71% | 2149 fps | 95.6% |
| IMR 4451 Enduron | <<locked>> | 88% | 41,495 psi | 66% | 2077 fps | 95.3% |
| IMR 4831 | <<locked>> | 86% | 30,458 psi | 48% | 1949 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 37,855 psi | 60% | 2060 fps | 98.7% |
| IMR 8208 XBR | <<locked>> | 80% | 43,221 psi | 69% | 2093 fps | 99.8% |
| Lovex D073.5 | <<locked>> | 80% | 48,457 psi | 77% | 2156 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 39,929 psi | 63% | 2070 fps | 100% |
| Lovex S060 | <<locked>> | 80% | 41,713 psi | 66% | 2037 fps | 99.2% |
| Lovex S062 | <<locked>> | 80% | 36,666 psi | 58% | 2001 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 35,969 psi | 57% | 1991 fps | 95.4% |
| Lovex S070 | <<locked>> | 92% | 40,886 psi | 65% | 2096 fps | 95.6% |
| Norma 201 | <<locked>> | 80% | 40,379 psi | 64% | 2051 fps | 99.7% |
| Norma 202 | <<locked>> | 80% | 40,480 psi | 64% | 2057 fps | 100% |
| Norma 203B | <<locked>> | 80% | 36,376 psi | 58% | 2028 fps | 98.3% |
| Norma URP | <<locked>> | 86% | 31,937 psi | 51% | 1985 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 35,679 psi | 57% | 2037 fps | 97.9% |
| Ramshot Hunter | <<locked>> | 92% | 37,956 psi | 60% | 2103 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 42,859 psi | 68% | 2096 fps | 97.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 42,148 psi | 67% | 2113 fps | 99.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 46,615 psi | 74% | 2133 fps | 99.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,426 psi | 42% | 1211 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 48,341 psi | 77% | 2156 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 37,579 psi | 60% | 2018 fps | 95% |
| ReloadSwiss RS 52 | 42.7 gr | 80% | 38,218 psi | 61% | 2113 fps | 98.3% |
| ReloadSwiss RS 60 | 43.4 gr | 80% | 31,473 psi | 50% | 2011 fps | 99.3% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 33,214 psi | 53% | 2037 fps | 95.7% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 36,143 psi | 57% | 2090 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 80% | 44,208 psi | 70% | 2077 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 38,435 psi | 61% | 2011 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 80% | 31,691 psi | 50% | 1942 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 90% | 42,250 psi | 67% | 2087 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 86% | 35,969 psi | 57% | 1991 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 39,929 psi | 63% | 2070 fps | 100% |
| Shooters World Precision | <<locked>> | 80% | 36,666 psi | 58% | 2001 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 92% | 40,886 psi | 65% | 2096 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 51,082 psi | 81% | 2169 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 32,692 psi | 52% | 1985 fps | 97.1% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 51,198 psi | 81% | 2142 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 41,017 psi | 65% | 2073 fps | 97.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 39,494 psi | 63% | 2060 fps | 98.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 41,858 psi | 66% | 2008 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 34,548 psi | 55% | 1906 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 40,016 psi | 63% | 2031 fps | 95.1% |
| Somchem S321 | <<locked>> | 80% | 46,224 psi | 73% | 2156 fps | 100% |
| Somchem S335 | <<locked>> | 80% | 41,481 psi | 66% | 2014 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 40,669 psi | 64% | 2073 fps | 99% |
| Somchem S355 | <<locked>> | 80% | 32,822 psi | 52% | 1952 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 23,786 psi | 38% | 1818 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 47,311 psi | 75% | 2054 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 42,061 psi | 67% | 2005 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 37,521 psi | 59% | 1995 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 38,218 psi | 61% | 2005 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 31,009 psi | 49% | 1903 fps | 98.5% |
| Vihtavuori N160 | <<locked>> | 84% | 31,502 psi | 50% | 1946 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 43,033 psi | 68% | 2087 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 80% | 36,825 psi | 58% | 2001 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 32,779 psi | 52% | 1988 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 92% | 29,051 psi | 46% | 1975 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 27,688 psi | 44% | 1844 fps | 95.6% |
| Winchester 748 | <<locked>> | 80% | 42,250 psi | 67% | 2123 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 41,379 psi | 66% | 2156 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 96% | 27,427 psi | 43% | 1969 fps | 95.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 38,740 psi | 61% | 2064 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 107 powders for .338-06 A-Square loaded with the .338 | 275gr | Speer SSP. Alliant Reloder-17 delivers the highest muzzle velocity at 2,411 fps; across all powders the maximum-charge window runs from 1,325 fps to 2,411 fps. Accurate 4350 gives the best case fill at 100 %, and 107 of the 107 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (435 MPa), the top charges use 49–90 %, leaving at least 10 % headroom. The 275.0 gr projectile in 0.338" calls for a 1:16.0 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 .338-06 A-Square with the .338 | 275gr | Speer SSP 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.