Load Specifications
Bullet:.338 | 250gr | Swift A-Frame
Bullet Manufacturer:Swift
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:1:15.5
Load data in caliber .338-06 A-Square with .338 | 250gr | Swift A-Frame 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 52 and Hodgdon LEVERevolution.
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>> | 90% | 57,043 psi | 90% | 2320 fps | 100% |
| Accurate 2460 | <<locked>> | 86% | 55,535 psi | 88% | 2349 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 53,998 psi | 86% | 2336 fps | 100% |
| Accurate 2520 | <<locked>> | 90% | 57,029 psi | 90% | 2402 fps | 100% |
| Accurate 2700 | <<locked>> | 94% | 55,085 psi | 87% | 2336 fps | 96.3% |
| Accurate 4064 | <<locked>> | 96% | 53,896 psi | 85% | 2375 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 45,890 psi | 73% | 2343 fps | 98.3% |
| Accurate LT-30 | <<locked>> | 84% | 56,927 psi | 90% | 2274 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 53,708 psi | 85% | 2254 fps | 100% |
| ADI AR 2206H | <<locked>> | 92% | 55,912 psi | 89% | 2408 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 98% | 56,623 psi | 90% | 2402 fps | 99.7% |
| ADI AR 2219 | <<locked>> | 82% | 53,722 psi | 85% | 2336 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 90% | 55,085 psi | 87% | 2365 fps | 100% |
| Alliant AR-Comp | <<locked>> | 90% | 55,056 psi | 87% | 2346 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 86% | 56,826 psi | 90% | 2454 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 94% | 54,984 psi | 87% | 2503 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 98% | 55,941 psi | 89% | 2421 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 56,971 psi | 90% | 2323 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 96% | 56,913 psi | 90% | 2441 fps | 99.8% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 45,818 psi | 73% | 2349 fps | 98.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 52,634 psi | 83% | 2477 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 32,271 psi | 51% | 2119 fps | 95.9% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 55,637 psi | 88% | 2274 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 92% | 55,317 psi | 88% | 2421 fps | 99.5% |
| Bofors RP3 | <<locked>> | 98% | 56,434 psi | 89% | 2434 fps | 100% |
| Bofors RP7ᴾ | <<locked>> | 100% | 53,708 psi | 85% | 2359 fps | 96.4% |
| Hodgdon Benchmark | <<locked>> | 88% | 54,143 psi | 86% | 2316 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 53,809 psi | 85% | 2395 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 88% | 55,579 psi | 88% | 2477 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 86% | 56,086 psi | 89% | 2362 fps | 100% |
| Hodgdon H335 | <<locked>> | 86% | 57,043 psi | 90% | 2388 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 54,433 psi | 86% | 2402 fps | 99% |
| Hodgdon H414ᴾ | <<locked>> | 100% | 49,356 psi | 78% | 2385 fps | 96.3% |
| Hodgdon H4350ᴾ | <<locked>> | 100% | 54,259 psi | 86% | 2402 fps | 95.8% |
| Hodgdon H4895 | <<locked>> | 92% | 56,391 psi | 89% | 2418 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 41,829 psi | 66% | 2247 fps | 98.8% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 54,795 psi | 87% | 2444 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,693 psi | 55% | 1391 fps | 100% |
| Hodgdon VARGET | <<locked>> | 92% | 54,259 psi | 86% | 2375 fps | 99.9% |
| IMR 3031 | <<locked>> | 92% | 55,434 psi | 88% | 2395 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 56,246 psi | 89% | 2388 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 94% | 57,043 psi | 90% | 2372 fps | 97.5% |
| IMR 4198 | <<locked>> | 84% | 53,954 psi | 86% | 2247 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 55,709 psi | 88% | 2385 fps | 97.2% |
| IMR 4831ᴾ | <<locked>> | 100% | 43,787 psi | 69% | 2297 fps | 98% |
| IMR 4895 | <<locked>> | 94% | 54,636 psi | 87% | 2425 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 90% | 55,085 psi | 87% | 2365 fps | 100% |
| Lovex D073.5 | <<locked>> | 86% | 55,317 psi | 88% | 2359 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 54,723 psi | 87% | 2385 fps | 100% |
| Lovex S060 | <<locked>> | 92% | 56,202 psi | 89% | 2346 fps | 99.9% |
| Lovex S062 | <<locked>> | 96% | 55,564 psi | 88% | 2385 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 51,140 psi | 81% | 2336 fps | 97.8% |
| Lovex S070ᴾ | <<locked>> | 100% | 48,559 psi | 77% | 2320 fps | 96.3% |
| Norma 200 | <<locked>> | 82% | 56,840 psi | 90% | 2300 fps | 100% |
| Norma 201 | <<locked>> | 92% | 54,476 psi | 86% | 2359 fps | 100% |
| Norma 202 | <<locked>> | 92% | 54,940 psi | 87% | 2365 fps | 100% |
| Norma 203B | <<locked>> | 96% | 55,999 psi | 89% | 2431 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 45,890 psi | 73% | 2339 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 96% | 56,202 psi | 89% | 2451 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 45,339 psi | 72% | 2329 fps | 96.2% |
| Ramshot TAC | <<locked>> | 90% | 55,593 psi | 88% | 2385 fps | 98.6% |
| Ramshot Wild Boar | <<locked>> | 90% | 54,534 psi | 86% | 2398 fps | 99.8% |
| Ramshot X-Terminator | <<locked>> | 88% | 56,550 psi | 90% | 2372 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,172 psi | 56% | 1427 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 54,955 psi | 87% | 2352 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 96% | 54,998 psi | 87% | 2385 fps | 97.8% |
| ReloadSwiss RS 52 | <<locked>> | 94% | 56,811 psi | 90% | 2497 fps | 99.8% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 56,289 psi | 89% | 2526 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 45,585 psi | 72% | 2362 fps | 98% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 46,804 psi | 74% | 2379 fps | 97.5% |
| Rottweil R 901 | <<locked>> | 90% | 55,854 psi | 89% | 2346 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 54,708 psi | 87% | 2352 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 55,912 psi | 89% | 2425 fps | 100% |
| Rottweil R 907ᴾ | <<locked>> | 100% | 53,708 psi | 85% | 2359 fps | 96.4% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 51,140 psi | 81% | 2336 fps | 97.8% |
| Shooters World Match Rifle | <<locked>> | 92% | 54,723 psi | 87% | 2385 fps | 100% |
| Shooters World Precision | <<locked>> | 96% | 55,564 psi | 88% | 2385 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 48,559 psi | 77% | 2320 fps | 96.3% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 54,694 psi | 87% | 2329 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 57,029 psi | 90% | 2047 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 54,259 psi | 86% | 2352 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 98% | 54,317 psi | 86% | 2438 fps | 99.8% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 54,578 psi | 87% | 2303 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 53,795 psi | 85% | 2365 fps | 98.8% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 53,998 psi | 86% | 2382 fps | 99.8% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 56,666 psi | 90% | 2306 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 98% | 56,188 psi | 89% | 2303 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 51,648 psi | 82% | 2297 fps | 96.5% |
| Somchem S321 | <<locked>> | 88% | 56,449 psi | 89% | 2402 fps | 100% |
| Somchem S335 | <<locked>> | 92% | 55,666 psi | 88% | 2310 fps | 100% |
| Somchem S341 | <<locked>> | 92% | 56,594 psi | 90% | 2402 fps | 99.9% |
| Somchem S355ᴾ | <<locked>> | 100% | 56,420 psi | 89% | 2421 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 40,886 psi | 65% | 2297 fps | 99.7% |
| Vihtavuori N130 | <<locked>> | 88% | 56,811 psi | 90% | 2280 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 56,565 psi | 90% | 2293 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 53,867 psi | 85% | 2326 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 55,448 psi | 88% | 2346 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 54,636 psi | 87% | 2365 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 48,486 psi | 77% | 2339 fps | 98.5% |
| Vihtavuori N530 | <<locked>> | 90% | 55,666 psi | 88% | 2365 fps | 100% |
| Vihtavuori N540 | <<locked>> | 96% | 57,014 psi | 90% | 2385 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 47,311 psi | 75% | 2343 fps | 98.2% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 33,982 psi | 54% | 2182 fps | 95.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 49,284 psi | 78% | 2326 fps | 99.7% |
| Winchester 748 | <<locked>> | 90% | 54,795 psi | 87% | 2408 fps | 100% |
| Winchester 760ᴾ | <<locked>> | 100% | 49,676 psi | 79% | 2392 fps | 96.4% |
| Winchester StaBALL Match | <<locked>> | 92% | 53,766 psi | 85% | 2392 fps | 99.9% |
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% | 42,076 psi | 67% | 2136 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 45,542 psi | 72% | 2221 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 34,534 psi | 55% | 2067 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 40,741 psi | 65% | 2188 fps | 99.9% |
| Accurate 2700 | <<locked>> | 92% | 51,619 psi | 82% | 2290 fps | 95.6% |
| Accurate 4064 | <<locked>> | 80% | 32,663 psi | 52% | 2057 fps | 99.6% |
| Accurate 4350 | <<locked>> | 92% | 34,795 psi | 55% | 2159 fps | 95.5% |
| Accurate LT-30 | <<locked>> | 80% | 50,212 psi | 80% | 2195 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 50,604 psi | 80% | 2215 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 38,537 psi | 61% | 2149 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 80% | 32,938 psi | 52% | 2028 fps | 95.3% |
| ADI AR 2219 | <<locked>> | 80% | 50,212 psi | 80% | 2293 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 40,524 psi | 64% | 2159 fps | 99.1% |
| Alliant AR-Comp | <<locked>> | 80% | 39,566 psi | 63% | 2152 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 46,905 psi | 74% | 2323 fps | 99.6% |
| Alliant Power Pro 2000-MR | 44.6 gr | 80% | 34,563 psi | 55% | 2152 fps | 95.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 31,836 psi | 50% | 2041 fps | 96.9% |
| Alliant Reloder-10x | <<locked>> | 80% | 47,471 psi | 75% | 2211 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 34,461 psi | 55% | 2090 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 92% | 36,042 psi | 57% | 2169 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 84% | 31,285 psi | 50% | 2093 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 98% | 30,501 psi | 48% | 2077 fps | 95% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 49,211 psi | 78% | 2198 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 37,318 psi | 59% | 2146 fps | 96.4% |
| Bofors RP3 | <<locked>> | 80% | 31,038 psi | 49% | 2037 fps | 96.8% |
| Bofors RP7 | <<locked>> | 96% | 47,398 psi | 75% | 2270 fps | 95% |
| Hodgdon Benchmark | <<locked>> | 80% | 42,467 psi | 67% | 2152 fps | 99.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 38,508 psi | 61% | 2172 fps | 99.2% |
| Hodgdon CFE223 | <<locked>> | 80% | 42,337 psi | 67% | 2283 fps | 98.2% |
| Hodgdon H322 | <<locked>> | 80% | 46,079 psi | 73% | 2241 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 46,905 psi | 74% | 2264 fps | 100% |
| Hodgdon H380 | <<locked>> | 84% | 36,695 psi | 58% | 2129 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 98% | 46,209 psi | 73% | 2339 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 98% | 51,126 psi | 81% | 2359 fps | 95.1% |
| Hodgdon H4895 | <<locked>> | 80% | 38,783 psi | 61% | 2159 fps | 98.4% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 30,966 psi | 49% | 2041 fps | 95.7% |
| Hodgdon LEVERevolution | 43.8 gr | 80% | 34,737 psi | 55% | 2129 fps | 97.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,831 psi | 41% | 1243 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 37,231 psi | 59% | 2116 fps | 97.9% |
| IMR 3031 | <<locked>> | 80% | 37,855 psi | 60% | 2159 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 34,519 psi | 55% | 2051 fps | 96.2% |
| IMR 4166 Enduron | <<locked>> | 88% | 47,355 psi | 75% | 2241 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 48,269 psi | 77% | 2182 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 94% | 46,528 psi | 74% | 2257 fps | 95.3% |
| IMR 4831 | <<locked>> | 92% | 34,055 psi | 54% | 2123 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 35,215 psi | 56% | 2116 fps | 97.1% |
| IMR 8208 XBR | <<locked>> | 80% | 40,524 psi | 64% | 2159 fps | 99.1% |
| Lovex D073.5 | <<locked>> | 80% | 45,136 psi | 72% | 2228 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 80% | 36,912 psi | 59% | 2133 fps | 99.6% |
| Lovex S060 | <<locked>> | 80% | 39,160 psi | 62% | 2100 fps | 97.9% |
| Lovex S062 | <<locked>> | 80% | 33,997 psi | 54% | 2054 fps | 97.9% |
| Lovex S065 | <<locked>> | 92% | 40,205 psi | 64% | 2169 fps | 95.4% |
| Lovex S070 | <<locked>> | 98% | 45,759 psi | 73% | 2277 fps | 95.6% |
| Norma 200 | <<locked>> | 80% | 53,563 psi | 85% | 2260 fps | 100% |
| Norma 201 | <<locked>> | 80% | 37,840 psi | 60% | 2113 fps | 98.7% |
| Norma 202 | <<locked>> | 80% | 37,811 psi | 60% | 2123 fps | 99.9% |
| Norma 203B | <<locked>> | 80% | 33,852 psi | 54% | 2083 fps | 96.6% |
| Norma URP | <<locked>> | 92% | 35,607 psi | 56% | 2159 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 33,156 psi | 53% | 2087 fps | 96% |
| Ramshot Hunter | <<locked>> | 98% | 42,525 psi | 67% | 2283 fps | 95.4% |
| Ramshot TAC | <<locked>> | 80% | 40,393 psi | 64% | 2159 fps | 95.6% |
| Ramshot Wild Boar | <<locked>> | 80% | 39,508 psi | 63% | 2175 fps | 98% |
| Ramshot X-Terminator | <<locked>> | 80% | 43,743 psi | 69% | 2198 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,121 psi | 41% | 1273 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 45,382 psi | 72% | 2228 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 88% | 42,482 psi | 67% | 2205 fps | 95.2% |
| ReloadSwiss RS 52 | 43.2 gr | 80% | 35,302 psi | 56% | 2165 fps | 96.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,327 psi | 46% | 2054 fps | 97.5% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 37,391 psi | 59% | 2221 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 96% | 40,828 psi | 65% | 2277 fps | 95.8% |
| Rottweil R 901 | <<locked>> | 80% | 41,640 psi | 66% | 2152 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 36,042 psi | 57% | 2073 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 80% | 29,269 psi | 46% | 1991 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 96% | 47,398 psi | 75% | 2270 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 92% | 40,205 psi | 64% | 2169 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 80% | 36,912 psi | 59% | 2133 fps | 99.6% |
| Shooters World Precision | <<locked>> | 80% | 33,997 psi | 54% | 2054 fps | 97.9% |
| Shooters World SW4350 | <<locked>> | 98% | 45,759 psi | 73% | 2277 fps | 95.6% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 47,921 psi | 76% | 2241 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 54,375 psi | 86% | 2021 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 50,850 psi | 81% | 2310 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 32,460 psi | 51% | 2077 fps | 95.8% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 48,211 psi | 76% | 2224 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 38,189 psi | 61% | 2129 fps | 95.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 36,869 psi | 58% | 2119 fps | 97.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 39,436 psi | 63% | 2080 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 32,416 psi | 51% | 1972 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 96% | 45,194 psi | 72% | 2211 fps | 95.2% |
| Somchem S321 | <<locked>> | 80% | 43,366 psi | 69% | 2224 fps | 99.6% |
| Somchem S335 | <<locked>> | 80% | 38,972 psi | 62% | 2083 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 38,043 psi | 60% | 2133 fps | 97.6% |
| Somchem S355 | <<locked>> | 80% | 30,516 psi | 48% | 2005 fps | 95.9% |
| Somchem S365 | <<locked>> | 86% | 26,513 psi | 42% | 1985 fps | 95.2% |
| Vihtavuori N130 | <<locked>> | 80% | 44,730 psi | 71% | 2136 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 39,537 psi | 63% | 2080 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 34,882 psi | 55% | 2064 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 35,665 psi | 57% | 2067 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 80% | 28,790 psi | 46% | 1952 fps | 96.8% |
| Vihtavuori N160 | <<locked>> | 90% | 35,201 psi | 56% | 2116 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 40,263 psi | 64% | 2152 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 80% | 34,330 psi | 54% | 2060 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 92% | 36,579 psi | 58% | 2165 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 98% | 31,995 psi | 51% | 2139 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 31,502 psi | 50% | 2018 fps | 95.9% |
| Winchester 748 | <<locked>> | 80% | 39,218 psi | 62% | 2188 fps | 99.5% |
| Winchester 760 | <<locked>> | 98% | 46,514 psi | 74% | 2343 fps | 95.7% |
| Winchester StaBALL Match | <<locked>> | 80% | 36,187 psi | 57% | 2126 fps | 97.8% |
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 107 powders for .338-06 A-Square loaded with the .338 | 250gr | Swift A-Frame. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,526 fps; across all powders the maximum-charge window runs from 1,391 fps to 2,526 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 51–90 %, 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-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 52, Hodgdon LEVERevolution rank at the top here: for .338-06 A-Square 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.