Load Specifications
Bullet Manufacturer:Woodleigh
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 | Woodleigh RN SN 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>> | 88% | 55,782 psi | 88% | 2323 fps | 100% |
| Accurate 2460 | <<locked>> | 84% | 54,114 psi | 86% | 2349 fps | 100% |
| Accurate 2495 | <<locked>> | 94% | 56,681 psi | 90% | 2379 fps | 100% |
| Accurate 2520 | <<locked>> | 88% | 53,867 psi | 85% | 2392 fps | 100% |
| Accurate 2700 | <<locked>> | 96% | 54,375 psi | 86% | 2343 fps | 96.5% |
| Accurate 4064 | <<locked>> | 96% | 56,347 psi | 89% | 2418 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 48,269 psi | 77% | 2395 fps | 98.9% |
| Accurate LT-30 | <<locked>> | 82% | 54,998 psi | 87% | 2270 fps | 100% |
| Accurate LT-32 | <<locked>> | 82% | 55,434 psi | 88% | 2293 fps | 100% |
| ADI AR 2206H | <<locked>> | 90% | 54,737 psi | 87% | 2412 fps | 99.9% |
| ADI AR 2208 | <<locked>> | 96% | 55,390 psi | 88% | 2407 fps | 99.8% |
| ADI AR 2219 | <<locked>> | 82% | 56,144 psi | 89% | 2381 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 88% | 53,954 psi | 86% | 2372 fps | 100% |
| Alliant AR-Comp | <<locked>> | 88% | 53,954 psi | 86% | 2347 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 92% | 53,722 psi | 85% | 2509 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 96% | 54,897 psi | 87% | 2426 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 84% | 55,608 psi | 88% | 2325 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 94% | 55,825 psi | 88% | 2447 fps | 99.9% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 48,718 psi | 77% | 2402 fps | 99% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 56,536 psi | 90% | 2531 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 34,708 psi | 55% | 2173 fps | 97% |
| Baschieri & Pellagri 106 | <<locked>> | 82% | 54,143 psi | 86% | 2275 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 90% | 54,157 psi | 86% | 2426 fps | 99.5% |
| Bofors RP3 | <<locked>> | 96% | 55,245 psi | 88% | 2439 fps | 100% |
| Bofors RP7 | <<locked>> | 98% | 53,693 psi | 85% | 2367 fps | 96.6% |
| Hodgdon Benchmark | <<locked>> | 88% | 55,825 psi | 88% | 2354 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 90% | 56,318 psi | 89% | 2444 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 86% | 54,375 psi | 86% | 2480 fps | 99.8% |
| Hodgdon H322 | <<locked>> | 86% | 53,882 psi | 85% | 2356 fps | 100% |
| Hodgdon H335 | <<locked>> | 82% | 55,201 psi | 87% | 2386 fps | 100% |
| Hodgdon H380 | <<locked>> | 96% | 56,768 psi | 90% | 2452 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 98% | 53,476 psi | 85% | 2465 fps | 97.5% |
| Hodgdon H4895 | <<locked>> | 90% | 55,216 psi | 88% | 2421 fps | 100% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 44,933 psi | 71% | 2303 fps | 99.4% |
| Hodgdon LEVERevolution | <<locked>> | 94% | 53,766 psi | 85% | 2448 fps | 100% |
| Hodgdon Superformanceᴾ | <<locked>> | 100% | 53,693 psi | 85% | 2474 fps | 96.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,737 psi | 57% | 1413 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 55,216 psi | 88% | 2405 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 56,231 psi | 89% | 2421 fps | 100% |
| IMR 4064 | <<locked>> | 96% | 53,940 psi | 85% | 2379 fps | 99.8% |
| IMR 4166 Enduron | <<locked>> | 96% | 53,940 psi | 85% | 2355 fps | 97.3% |
| IMR 4198 | <<locked>> | 84% | 56,043 psi | 89% | 2288 fps | 100% |
| IMR 4350ᴾ | <<locked>> | 100% | 49,008 psi | 78% | 2339 fps | 95.8% |
| IMR 4451 Enduron | <<locked>> | 98% | 54,636 psi | 87% | 2395 fps | 97.4% |
| IMR 4831ᴾ | <<locked>> | 100% | 41,133 psi | 65% | 2269 fps | 97.7% |
| IMR 4895 | <<locked>> | 92% | 53,751 psi | 85% | 2430 fps | 99.9% |
| IMR 8208 XBR | <<locked>> | 88% | 53,954 psi | 86% | 2371 fps | 100% |
| Lovex D073.5 | <<locked>> | 84% | 53,882 psi | 85% | 2358 fps | 100% |
| Lovex D073.6 | <<locked>> | 90% | 53,867 psi | 85% | 2392 fps | 100% |
| Lovex S060 | <<locked>> | 90% | 54,650 psi | 87% | 2348 fps | 99.9% |
| Lovex S062 | <<locked>> | 94% | 54,665 psi | 87% | 2391 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 54,781 psi | 87% | 2385 fps | 98.4% |
| Lovex S070ᴾ | <<locked>> | 100% | 52,011 psi | 82% | 2370 fps | 97.1% |
| Norma 201 | <<locked>> | 92% | 56,884 psi | 90% | 2406 fps | 100% |
| Norma 202 | <<locked>> | 92% | 57,058 psi | 90% | 2404 fps | 100% |
| Norma 203B | <<locked>> | 94% | 54,969 psi | 87% | 2437 fps | 99.9% |
| Norma URPᴾ | <<locked>> | 100% | 49,211 psi | 78% | 2388 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 94% | 55,187 psi | 87% | 2459 fps | 99.9% |
| Ramshot Hunterᴾ | <<locked>> | 100% | 48,385 psi | 77% | 2382 fps | 97.1% |
| Ramshot TAC | <<locked>> | 88% | 54,114 psi | 86% | 2386 fps | 98.7% |
| Ramshot Wild Boar | <<locked>> | 90% | 56,913 psi | 90% | 2446 fps | 100% |
| Ramshot X-Terminator | <<locked>> | 86% | 55,143 psi | 87% | 2376 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,708 psi | 57% | 1450 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 86% | 57,087 psi | 90% | 2397 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 53,693 psi | 85% | 2391 fps | 97.9% |
| ReloadSwiss RS 52 | <<locked>> | 92% | 55,840 psi | 89% | 2503 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 98% | 56,405 psi | 89% | 2533 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 48,631 psi | 77% | 2414 fps | 98.6% |
| ReloadSwiss RS 70ᴾ | <<locked>> | 100% | 49,516 psi | 78% | 2437 fps | 98.3% |
| Rottweil R 901 | <<locked>> | 88% | 54,679 psi | 87% | 2349 fps | 100% |
| Rottweil R 902 | <<locked>> | 94% | 57,029 psi | 90% | 2400 fps | 100% |
| Rottweil R 903 | <<locked>> | 98% | 56,115 psi | 89% | 2431 fps | 100% |
| Rottweil R 907 | <<locked>> | 98% | 53,693 psi | 85% | 2367 fps | 96.6% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 54,781 psi | 87% | 2385 fps | 98.4% |
| Shooters World Match Rifle | <<locked>> | 90% | 53,867 psi | 85% | 2392 fps | 100% |
| Shooters World Precision | <<locked>> | 94% | 54,665 psi | 87% | 2391 fps | 100% |
| Shooters World SW4350ᴾ | <<locked>> | 100% | 50,662 psi | 80% | 2369 fps | 97.1% |
| Shooters World Tactical Rifle | <<locked>> | 84% | 57,014 psi | 90% | 2375 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 82% | 56,391 psi | 89% | 2393 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 96% | 53,374 psi | 85% | 2443 fps | 99.9% |
| SNPE Vectan SP 3 | <<locked>> | 84% | 56,594 psi | 90% | 2343 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 90% | 56,130 psi | 89% | 2415 fps | 99.2% |
| SNPE Vectan SP 9 | <<locked>> | 92% | 56,376 psi | 89% | 2431 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 90% | 55,477 psi | 88% | 2313 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 55,071 psi | 87% | 2310 fps | 100% |
| SNPE Vectan Tubal 7000ᴾ | <<locked>> | 100% | 54,636 psi | 87% | 2350 fps | 97.3% |
| Somchem S321 | <<locked>> | 86% | 55,158 psi | 87% | 2404 fps | 100% |
| Somchem S335 | <<locked>> | 90% | 54,476 psi | 86% | 2312 fps | 100% |
| Somchem S341 | <<locked>> | 90% | 55,317 psi | 88% | 2404 fps | 99.9% |
| Somchem S355 | <<locked>> | 98% | 55,738 psi | 88% | 2428 fps | 100% |
| Somchem S365ᴾ | <<locked>> | 100% | 43,787 psi | 69% | 2347 fps | 99.9% |
| Unknown powderᴾ | <<locked>> | 100% | 52,953 psi | 84% | 2442 fps | 98.9% |
| Vihtavuori N120 | <<locked>> | 82% | 56,492 psi | 90% | 2229 fps | 100% |
| Vihtavuori N130 | <<locked>> | 86% | 54,215 psi | 86% | 2270 fps | 100% |
| Vihtavuori N133 | <<locked>> | 92% | 54,708 psi | 87% | 2293 fps | 100% |
| Vihtavuori N135 | <<locked>> | 94% | 56,536 psi | 90% | 2369 fps | 100% |
| Vihtavuori N140 | <<locked>> | 94% | 56,942 psi | 90% | 2380 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 51,401 psi | 81% | 2328 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 53,737 psi | 85% | 2421 fps | 99.3% |
| Vihtavuori N530 | <<locked>> | 88% | 57,058 psi | 90% | 2417 fps | 100% |
| Vihtavuori N540 | <<locked>> | 94% | 56,362 psi | 89% | 2405 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 54,665 psi | 87% | 2461 fps | 99.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 36,477 psi | 58% | 2240 fps | 97% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 53,113 psi | 84% | 2379 fps | 99.9% |
| Winchester 748 | <<locked>> | 86% | 54,549 psi | 86% | 2422 fps | 100% |
| Winchester 760 | <<locked>> | 98% | 53,476 psi | 85% | 2465 fps | 97.5% |
| Winchester StaBALL Match | <<locked>> | 84% | 54,230 psi | 86% | 2417 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% | 43,671 psi | 69% | 2172 fps | 100% |
| Accurate 2460 | <<locked>> | 80% | 47,413 psi | 75% | 2264 fps | 100% |
| Accurate 2495 | <<locked>> | 80% | 36,274 psi | 57% | 2110 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 41,118 psi | 65% | 2218 fps | 100% |
| Accurate 2700 | <<locked>> | 92% | 47,718 psi | 76% | 2251 fps | 95.1% |
| Accurate 4064 | <<locked>> | 80% | 34,316 psi | 54% | 2100 fps | 99.8% |
| Accurate 4350 | <<locked>> | 90% | 34,389 psi | 55% | 2165 fps | 95.8% |
| Accurate LT-30 | <<locked>> | 80% | 51,953 psi | 82% | 2234 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 52,373 psi | 83% | 2254 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 40,059 psi | 63% | 2192 fps | 98.4% |
| ADI AR 2208 | <<locked>> | 80% | 34,113 psi | 54% | 2066 fps | 96.1% |
| ADI AR 2219 | <<locked>> | 80% | 52,315 psi | 83% | 2336 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 42,076 psi | 67% | 2201 fps | 99.5% |
| Alliant AR-Comp | <<locked>> | 80% | 41,582 psi | 66% | 2195 fps | 100% |
| Alliant Power Pro 2000-MR | 46.6 gr | 80% | 36,172 psi | 57% | 2208 fps | 96.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 33,359 psi | 53% | 2085 fps | 97.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 49,168 psi | 78% | 2248 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 35,911 psi | 57% | 2136 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 33,315 psi | 53% | 2128 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 82% | 30,705 psi | 49% | 2097 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 96% | 30,052 psi | 48% | 2086 fps | 95.3% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 50,778 psi | 80% | 2235 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 38,812 psi | 62% | 2191 fps | 97.1% |
| Bofors RP3 | <<locked>> | 80% | 32,692 psi | 52% | 2087 fps | 97.6% |
| Bofors RP7 | <<locked>> | 94% | 46,499 psi | 74% | 2277 fps | 95.2% |
| Hodgdon Benchmark | <<locked>> | 80% | 43,990 psi | 70% | 2192 fps | 99.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 40,393 psi | 64% | 2221 fps | 99.6% |
| Hodgdon CFE223 | <<locked>> | 80% | 44,077 psi | 70% | 2333 fps | 98.8% |
| Hodgdon H322 | <<locked>> | 80% | 44,556 psi | 71% | 2233 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 51,547 psi | 82% | 2341 fps | 100% |
| Hodgdon H380 | <<locked>> | 82% | 36,071 psi | 57% | 2133 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 92% | 43,918 psi | 70% | 2322 fps | 95.4% |
| Hodgdon H4895 | <<locked>> | 80% | 40,335 psi | 64% | 2202 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 28,689 psi | 45% | 2002 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 34,214 psi | 54% | 2136 fps | 98% |
| Hodgdon Superformance | <<locked>> | 96% | 45,919 psi | 73% | 2366 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,976 psi | 41% | 1259 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 36,085 psi | 57% | 2110 fps | 97.9% |
| IMR 3031 | <<locked>> | 80% | 36,390 psi | 58% | 2148 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 33,533 psi | 53% | 2047 fps | 96.2% |
| IMR 4166 Enduron | <<locked>> | 90% | 45,353 psi | 72% | 2230 fps | 95.5% |
| IMR 4198 | <<locked>> | 80% | 49,792 psi | 79% | 2215 fps | 100% |
| IMR 4350 | <<locked>> | 98% | 46,079 psi | 73% | 2297 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 92% | 45,687 psi | 72% | 2267 fps | 95.5% |
| IMR 4831 | <<locked>> | 94% | 34,185 psi | 54% | 2142 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 36,724 psi | 58% | 2161 fps | 97.8% |
| IMR 8208 XBR | <<locked>> | 80% | 42,076 psi | 67% | 2201 fps | 99.5% |
| Lovex D073.5 | <<locked>> | 80% | 47,166 psi | 75% | 2272 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 38,493 psi | 61% | 2174 fps | 99.8% |
| Lovex S060 | <<locked>> | 80% | 40,596 psi | 64% | 2142 fps | 98.5% |
| Lovex S062 | <<locked>> | 80% | 35,520 psi | 56% | 2099 fps | 98.5% |
| Lovex S065 | <<locked>> | 90% | 39,552 psi | 63% | 2174 fps | 95.6% |
| Lovex S070 | <<locked>> | 94% | 42,206 psi | 67% | 2240 fps | 95.1% |
| Norma 201 | <<locked>> | 80% | 39,436 psi | 63% | 2157 fps | 99.2% |
| Norma 202 | <<locked>> | 80% | 39,436 psi | 63% | 2165 fps | 100% |
| Norma 203B | <<locked>> | 80% | 35,288 psi | 56% | 2126 fps | 97.3% |
| Norma URP | <<locked>> | 90% | 35,056 psi | 56% | 2164 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 34,737 psi | 55% | 2137 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 96% | 41,785 psi | 66% | 2293 fps | 95.7% |
| Ramshot TAC | <<locked>> | 80% | 41,829 psi | 66% | 2202 fps | 96.4% |
| Ramshot Wild Boar | <<locked>> | 80% | 41,060 psi | 65% | 2221 fps | 98.5% |
| Ramshot X-Terminator | <<locked>> | 80% | 45,571 psi | 72% | 2243 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,281 psi | 42% | 1291 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 47,282 psi | 75% | 2272 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 86% | 41,713 psi | 66% | 2211 fps | 95.3% |
| ReloadSwiss RS 52 | 45.1 gr | 80% | 37,014 psi | 59% | 2214 fps | 97.3% |
| ReloadSwiss RS 60 | 45.8 gr | 80% | 30,560 psi | 48% | 2103 fps | 98.3% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 34,330 psi | 54% | 2177 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 37,449 psi | 59% | 2232 fps | 95% |
| Rottweil R 901 | <<locked>> | 80% | 43,120 psi | 68% | 2191 fps | 100% |
| Rottweil R 902 | <<locked>> | 80% | 37,362 psi | 59% | 2113 fps | 98.8% |
| Rottweil R 903 | <<locked>> | 80% | 30,705 psi | 49% | 2037 fps | 96.6% |
| Rottweil R 907 | <<locked>> | 94% | 46,499 psi | 74% | 2277 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 39,552 psi | 63% | 2174 fps | 95.6% |
| Shooters World Match Rifle | <<locked>> | 80% | 38,493 psi | 61% | 2174 fps | 99.8% |
| Shooters World Precision | <<locked>> | 80% | 35,520 psi | 56% | 2099 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 94% | 42,206 psi | 67% | 2241 fps | 95.1% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 49,922 psi | 79% | 2287 fps | 99.9% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 52,707 psi | 84% | 2349 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 31,792 psi | 50% | 2078 fps | 95.9% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 49,980 psi | 79% | 2264 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 80% | 39,943 psi | 63% | 2179 fps | 96.5% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 38,479 psi | 61% | 2165 fps | 98% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 40,828 psi | 65% | 2118 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 33,649 psi | 53% | 2008 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 94% | 44,309 psi | 70% | 2217 fps | 95.4% |
| Somchem S321 | <<locked>> | 80% | 45,034 psi | 71% | 2267 fps | 99.8% |
| Somchem S335 | <<locked>> | 80% | 40,495 psi | 64% | 2124 fps | 100% |
| Somchem S341 | <<locked>> | 80% | 39,523 psi | 63% | 2177 fps | 98.2% |
| Somchem S355 | <<locked>> | 80% | 31,908 psi | 51% | 2049 fps | 96.7% |
| Somchem S365 | <<locked>> | 84% | 25,962 psi | 41% | 1985 fps | 95.3% |
| Unknown powder | <<locked>> | 88% | 36,129 psi | 57% | 2171 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 53,330 psi | 85% | 2195 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 45,585 psi | 72% | 2164 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 38,508 psi | 61% | 2078 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 36,448 psi | 58% | 2103 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 36,898 psi | 58% | 2106 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 27,093 psi | 43% | 1927 fps | 96.4% |
| Vihtavuori N160 | <<locked>> | 86% | 33,939 psi | 54% | 2107 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 44,092 psi | 70% | 2243 fps | 99.7% |
| Vihtavuori N540 | <<locked>> | 80% | 36,376 psi | 58% | 2121 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 33,982 psi | 54% | 2141 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 96% | 31,676 psi | 50% | 2149 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 28,819 psi | 46% | 1973 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 44,237 psi | 70% | 2284 fps | 100% |
| Winchester 760 | <<locked>> | 92% | 43,918 psi | 70% | 2322 fps | 95.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 47,021 psi | 75% | 2320 fps | 99.7% |
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 120 powders for .338-06 A-Square loaded with the .338 | 250gr | Woodleigh RN SN. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,533 fps; across all powders the maximum-charge window runs from 1,413 fps to 2,533 fps. Accurate 3100 gives the best case fill at 100 %, and 120 of the 120 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 250.0 gr projectile in 0.338" calls for a 1:6.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate 4350, ADI AR 2209 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 | 250gr | Woodleigh RN SN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, ADI AR 2209, Alliant Reloder-19 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.