Load Specifications
Bullet Manufacturer:SAKO
Bullet Weight:250 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:1:6.0
Load data in caliber .338-06 A-Square with .338 | 250gr | Sako Hammerhead 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 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% | 55,883 psi | 89% | 2326 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 54,273 psi | 86% | 2352 fps | 100% |
| Accurate 2495 | <<locked>> | 92% | 53,447 psi | 85% | 2346 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 55,825 psi | 88% | 2405 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 53,795 psi | 85% | 2343 fps | 96.5% |
| Accurate 4064 | <<locked>> | 96% | 56,492 psi | 90% | 2421 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 48,660 psi | 77% | 2402 fps | 99% |
| Accurate LT-30 | <<locked>> | 82% | 55,114 psi | 87% | 2274 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,535 psi | 88% | 2293 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 54,795 psi | 87% | 2415 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 96% | 55,521 psi | 88% | 2408 fps | 99.8% |
| ADI AR 2219 | <<locked>> | 82% | 56,231 psi | 89% | 2382 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 54,027 psi | 86% | 2372 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 54,056 psi | 86% | 2349 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 84% | 55,767 psi | 88% | 2464 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 54,085 psi | 86% | 2513 fps | 99.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 54,969 psi | 87% | 2428 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,724 psi | 88% | 2326 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,956 psi | 89% | 2448 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 47,848 psi | 76% | 2405 fps | 99% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 55,303 psi | 88% | 2533 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 33,997 psi | 54% | 2182 fps | 97.1% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,230 psi | 86% | 2277 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 54,201 psi | 86% | 2428 fps | 99.6% |
| Bofors RP3 | <<locked>> | 96% | 55,288 psi | 88% | 2441 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 55,927 psi | 89% | 2408 fps | 97.2% |
| Hodgdon Benchmark | <<locked>> | 88% | 56,231 psi | 89% | 2359 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 56,376 psi | 89% | 2444 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 54,447 psi | 86% | 2480 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 84% | 54,607 psi | 87% | 2365 fps | 100% |
| Hodgdon H335 | <<locked>> | 84% | 55,579 psi | 88% | 2392 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 56,884 psi | 90% | 2454 fps | 99.4% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 51,967 psi | 82% | 2444 fps | 97.3% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 57,058 psi | 90% | 2461 fps | 96.7% |
| Hodgdon H4895 | <<locked>> | 90% | 55,274 psi | 88% | 2425 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,150 psi | 70% | 2303 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 92% | 53,824 psi | 85% | 2451 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 53,127 psi | 84% | 2477 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,143 psi | 56% | 1417 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 56,521 psi | 90% | 2425 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 54,694 psi | 87% | 2405 fps | 100% |
| IMR 4064 | <<locked>> | 94% | 55,274 psi | 88% | 2398 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 92% | 55,811 psi | 88% | 2382 fps | 97.7% |
| IMR 4198 | <<locked>> | 84% | 55,825 psi | 88% | 2287 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 49,371 psi | 78% | 2346 fps | 95.9% |
| IMR 4451 Enduron | <<locked>> | 98% | 54,679 psi | 87% | 2395 fps | 97.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 46,238 psi | 73% | 2352 fps | 98.7% |
| IMR 4895 | <<locked>> | 92% | 53,824 psi | 85% | 2431 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 54,027 psi | 86% | 2372 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 53,940 psi | 85% | 2359 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 53,940 psi | 85% | 2395 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 54,723 psi | 87% | 2349 fps | 99.9% |
| Lovex S062 | <<locked>> | 94% | 54,723 psi | 87% | 2395 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 53,635 psi | 85% | 2392 fps | 98.5% |
| Lovex S070ᴾ | <<locked>> | 100% | 51,024 psi | 81% | 2375 fps | 97.2% |
| Norma 201 | <<locked>> | 92% | 56,942 psi | 90% | 2408 fps | 100% |
| Norma 202 | <<locked>> | 90% | 53,983 psi | 86% | 2369 fps | 100% |
| Norma 203B | <<locked>> | 94% | 55,027 psi | 87% | 2438 fps | 100% |
| Norma URPᴾ | <<locked>> | 100% | 48,385 psi | 77% | 2395 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 94% | 55,216 psi | 88% | 2461 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 47,355 psi | 75% | 2385 fps | 97.1% |
| Ramshot TAC | <<locked>> | 88% | 54,462 psi | 86% | 2392 fps | 98.8% |
| Ramshot Wild Boar | <<locked>> | 88% | 53,592 psi | 85% | 2408 fps | 99.9% |
| Ramshot X-Terminator | <<locked>> | 86% | 55,274 psi | 88% | 2379 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,375 psi | 56% | 1450 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 53,708 psi | 85% | 2359 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 53,708 psi | 85% | 2392 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,985 psi | 89% | 2507 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 55,332 psi | 88% | 2536 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 48,196 psi | 76% | 2421 fps | 98.7% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 48,907 psi | 78% | 2438 fps | 98.3% |
| Rottweil R 901 | <<locked>> | 88% | 54,766 psi | 87% | 2349 fps | 100% |
| Rottweil R 902 | <<locked>> | 92% | 53,983 psi | 86% | 2365 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 55,187 psi | 87% | 2434 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 55,927 psi | 89% | 2408 fps | 97.2% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 53,635 psi | 85% | 2392 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 90% | 53,940 psi | 85% | 2395 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 54,723 psi | 87% | 2395 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 51,024 psi | 81% | 2375 fps | 97.2% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 57,087 psi | 90% | 2375 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 56,463 psi | 89% | 2395 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 56,913 psi | 90% | 2487 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,710 psi | 90% | 2346 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 56,159 psi | 89% | 2418 fps | 99.3% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 56,420 psi | 89% | 2434 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,550 psi | 88% | 2313 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 55,129 psi | 87% | 2313 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 54,186 psi | 86% | 2352 fps | 97.3% |
| Somchem S321 | <<locked>> | 86% | 55,201 psi | 87% | 2405 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,621 psi | 87% | 2313 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,434 psi | 88% | 2408 fps | 99.9% |
| Somchem S355 | <<locked>> | 98% | 55,695 psi | 88% | 2431 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 43,149 psi | 68% | 2352 fps | 99.9% |
| Vihtavuori N130 | <<locked>> | 86% | 55,376 psi | 88% | 2283 fps | 100% |
| Vihtavuori N133 | <<locked>> | 90% | 55,550 psi | 88% | 2300 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 56,623 psi | 90% | 2372 fps | 100% |
| Vihtavuori N140 | <<locked>> | 92% | 54,244 psi | 86% | 2349 fps | 100% |
| Vihtavuori N150 | <<locked>> | 98% | 53,795 psi | 85% | 2372 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 50,981 psi | 81% | 2392 fps | 99.1% |
| Vihtavuori N530 | <<locked>> | 88% | 54,462 psi | 86% | 2372 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 55,869 psi | 89% | 2392 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 49,705 psi | 79% | 2395 fps | 98.8% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,056 psi | 57% | 2241 fps | 97% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 51,663 psi | 82% | 2379 fps | 100% |
| Winchester 748 | <<locked>> | 88% | 53,722 psi | 85% | 2415 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 51,967 psi | 82% | 2444 fps | 97.3% |
| Winchester StaBALL Match | <<locked>> | 92% | 56,159 psi | 89% | 2441 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% | 43,787 psi | 69% | 2175 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,500 psi | 75% | 2267 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,376 psi | 58% | 2113 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 42,685 psi | 68% | 2234 fps | 100% |
| Accurate 2700 | <<locked>> | 88% | 47,268 psi | 75% | 2251 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 34,418 psi | 55% | 2103 fps | 99.9% |
| Accurate 4350 | <<locked>> | 90% | 34,447 psi | 55% | 2165 fps | 95.8% |
| Accurate LT-30 | <<locked>> | 80% | 52,069 psi | 83% | 2238 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,475 psi | 83% | 2257 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,147 psi | 64% | 2195 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 80% | 34,185 psi | 54% | 2067 fps | 96.1% |
| ADI AR 2219 | <<locked>> | 80% | 52,417 psi | 83% | 2339 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,163 psi | 67% | 2205 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 41,698 psi | 66% | 2198 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 48,965 psi | 78% | 2369 fps | 99.9% |
| Alliant Power Pro 2000-MR | 46.7 gr | 80% | 36,245 psi | 57% | 2211 fps | 96.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,446 psi | 53% | 2087 fps | 97.7% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,298 psi | 78% | 2251 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,998 psi | 57% | 2139 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 88% | 33,359 psi | 53% | 2129 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 82% | 30,763 psi | 49% | 2100 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 96% | 30,081 psi | 48% | 2087 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,850 psi | 81% | 2238 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,885 psi | 62% | 2195 fps | 97.2% |
| Bofors RP3 | <<locked>> | 80% | 32,764 psi | 52% | 2090 fps | 97.6% |
| Bofors RP7 | <<locked>> | 94% | 46,557 psi | 74% | 2280 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 44,077 psi | 70% | 2195 fps | 99.9% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,480 psi | 64% | 2221 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,425 psi | 70% | 2336 fps | 98.9% |
| Hodgdon H322 | <<locked>> | 80% | 48,225 psi | 76% | 2283 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 48,776 psi | 77% | 2306 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 36,143 psi | 57% | 2136 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 94% | 42,757 psi | 68% | 2303 fps | 95.1% |
| Hodgdon H4350 | <<locked>> | 96% | 50,067 psi | 79% | 2365 fps | 95.3% |
| Hodgdon H4895 | <<locked>> | 80% | 40,437 psi | 64% | 2205 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 28,747 psi | 46% | 2005 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 36,376 psi | 58% | 2178 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 96% | 46,195 psi | 73% | 2372 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,150 psi | 41% | 1263 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 39,001 psi | 62% | 2165 fps | 98.6% |
| IMR 3031 | <<locked>> | 80% | 39,610 psi | 63% | 2201 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 35,839 psi | 57% | 2096 fps | 96.9% |
| IMR 4166 Enduron | <<locked>> | 84% | 43,424 psi | 69% | 2201 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 49,922 psi | 79% | 2218 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 46,398 psi | 74% | 2300 fps | 95.2% |
| IMR 4451 Enduron | <<locked>> | 92% | 45,803 psi | 73% | 2267 fps | 95.6% |
| IMR 4831 | <<locked>> | 90% | 33,634 psi | 53% | 2133 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 36,825 psi | 58% | 2165 fps | 97.8% |
| IMR 8208 XBR | <<locked>> | 80% | 42,163 psi | 67% | 2205 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 47,326 psi | 75% | 2274 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 38,580 psi | 61% | 2178 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 40,683 psi | 64% | 2142 fps | 98.5% |
| Lovex S062 | <<locked>> | 80% | 35,621 psi | 56% | 2103 fps | 98.6% |
| Lovex S065 | <<locked>> | 90% | 39,610 psi | 63% | 2178 fps | 95.6% |
| Lovex S070 | <<locked>> | 94% | 42,250 psi | 67% | 2241 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 39,479 psi | 63% | 2159 fps | 99.2% |
| Norma 202 | <<locked>> | 80% | 39,479 psi | 63% | 2165 fps | 100% |
| Norma 203B | <<locked>> | 80% | 35,375 psi | 56% | 2129 fps | 97.4% |
| Norma URP | <<locked>> | 88% | 33,170 psi | 53% | 2126 fps | 95% |
| Ramshot Big Game | 46.7 gr | 80% | 34,795 psi | 55% | 2139 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 96% | 41,872 psi | 66% | 2293 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 41,887 psi | 66% | 2205 fps | 96.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,133 psi | 65% | 2221 fps | 98.6% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,643 psi | 72% | 2247 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,208 psi | 42% | 1289 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,369 psi | 75% | 2274 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 41,771 psi | 66% | 2215 fps | 95.4% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 37,101 psi | 59% | 2218 fps | 97.3% |
| ReloadSwiss RS 60 | 45.9 gr | 80% | 30,618 psi | 49% | 2106 fps | 98.4% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 34,389 psi | 55% | 2178 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 37,681 psi | 60% | 2238 fps | 95.2% |
| Rottweil R 901 | <<locked>> | 80% | 43,236 psi | 69% | 2192 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 37,463 psi | 59% | 2116 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 80% | 30,792 psi | 49% | 2041 fps | 96.7% |
| Rottweil R 907 | <<locked>> | 94% | 46,557 psi | 74% | 2280 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 39,610 psi | 63% | 2178 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,580 psi | 61% | 2178 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 35,621 psi | 56% | 2103 fps | 98.6% |
| Shooters World SW4350 | <<locked>> | 94% | 42,250 psi | 67% | 2241 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 50,009 psi | 79% | 2290 fps | 99.9% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,823 psi | 84% | 2352 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,865 psi | 51% | 2080 fps | 96% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 50,096 psi | 79% | 2267 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 40,045 psi | 63% | 2182 fps | 96.6% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,566 psi | 61% | 2169 fps | 98.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,930 psi | 65% | 2119 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,750 psi | 53% | 2011 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 44,425 psi | 70% | 2218 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 45,107 psi | 71% | 2267 fps | 99.9% |
| Somchem S335 | <<locked>> | 80% | 40,596 psi | 64% | 2126 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,653 psi | 63% | 2178 fps | 98.2% |
| Somchem S355 | <<locked>> | 80% | 31,995 psi | 51% | 2051 fps | 96.8% |
| Somchem S365 | <<locked>> | 84% | 26,020 psi | 41% | 1988 fps | 95.4% |
| Vihtavuori N130 | <<locked>> | 80% | 46,354 psi | 73% | 2172 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 41,133 psi | 65% | 2116 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,506 psi | 58% | 2106 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 37,289 psi | 59% | 2113 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 30,182 psi | 48% | 1998 fps | 97.6% |
| Vihtavuori N160 | <<locked>> | 88% | 34,737 psi | 55% | 2126 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 42,119 psi | 67% | 2198 fps | 99.5% |
| Vihtavuori N540 | <<locked>> | 80% | 35,940 psi | 57% | 2106 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 88% | 33,852 psi | 54% | 2126 fps | 95% |
| Vihtavuori N555 | <<locked>> | 96% | 31,763 psi | 50% | 2152 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 28,848 psi | 46% | 1975 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 41,321 psi | 65% | 2238 fps | 99.8% |
| Winchester 760 | <<locked>> | 94% | 42,989 psi | 68% | 2306 fps | 95.1% |
| Winchester StaBALL Match | <<locked>> | 80% | 37,855 psi | 60% | 2172 fps | 98.5% |
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 | 250gr | Sako Hammerhead. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,536 fps; across all powders the maximum-charge window runs from 1,417 fps to 2,536 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 54–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:6.0 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, Ramshot Big Game rank at the top here: for .338-06 A-Square with the .338 | 250gr | Sako Hammerhead 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.