Load Specifications
Bullet Manufacturer:Lapua
Bullet Weight:231 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 | 231gr | Lapua Naturalis bullet and 99 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 CFE223.
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>> | 92% | 55,100 psi | 87% | 2405 fps | 100% |
| Accurate 2200 | <<locked>> | 84% | 56,130 psi | 89% | 2493 fps | 99.2% |
| Accurate 2230 | <<locked>> | 84% | 56,811 psi | 90% | 2503 fps | 99.4% |
| Accurate 2460 | <<locked>> | 88% | 53,563 psi | 85% | 2431 fps | 100% |
| Accurate 2495 | <<locked>> | 98% | 54,650 psi | 87% | 2454 fps | 100% |
| Accurate 2520 | <<locked>> | 92% | 54,911 psi | 87% | 2480 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 54,128 psi | 86% | 2487 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 39,856 psi | 63% | 2343 fps | 96% |
| Accurate LT-30 | <<locked>> | 86% | 56,086 psi | 89% | 2362 fps | 100% |
| Accurate LT-32 | <<locked>> | 86% | 56,521 psi | 90% | 2382 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 54,056 psi | 86% | 2484 fps | 99.5% |
| ADI AR 2207 | <<locked>> | 82% | 53,969 psi | 86% | 2336 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 55,013 psi | 87% | 2477 fps | 99.1% |
| ADI AR 2219 | <<locked>> | 86% | 56,144 psi | 89% | 2470 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 53,737 psi | 85% | 2448 fps | 99.9% |
| Alliant AR-Comp | <<locked>> | 94% | 56,333 psi | 89% | 2467 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 88% | 55,085 psi | 87% | 2539 fps | 99.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 53,505 psi | 85% | 2575 fps | 99% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 53,737 psi | 85% | 2493 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 88% | 55,288 psi | 88% | 2411 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 98% | 54,824 psi | 87% | 2513 fps | 99.3% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 41,568 psi | 66% | 2359 fps | 96.2% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 47,645 psi | 76% | 2497 fps | 99.1% |
| Alliant Reloder-7 | <<locked>> | 82% | 54,926 psi | 87% | 2356 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 55,056 psi | 87% | 2365 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 53,635 psi | 85% | 2497 fps | 98.7% |
| Bofors RP3ᴾ | <<locked>> | 100% | 53,795 psi | 85% | 2507 fps | 99.8% |
| Hodgdon Benchmark | <<locked>> | 92% | 56,347 psi | 89% | 2438 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 94% | 55,564 psi | 88% | 2520 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 90% | 53,983 psi | 86% | 2556 fps | 99.2% |
| Hodgdon H322 | <<locked>> | 88% | 54,404 psi | 86% | 2448 fps | 100% |
| Hodgdon H335 | <<locked>> | 88% | 55,506 psi | 88% | 2477 fps | 100% |
| Hodgdon H380ᴾ | <<locked>> | 100% | 56,043 psi | 89% | 2520 fps | 98.5% |
| Hodgdon H4198 | <<locked>> | 82% | 54,723 psi | 87% | 2362 fps | 100% |
| Hodgdon H4895 | <<locked>> | 94% | 54,491 psi | 86% | 2493 fps | 99.7% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 37,521 psi | 59% | 2257 fps | 96.9% |
| Hodgdon LEVERevolution | <<locked>> | 98% | 56,579 psi | 90% | 2569 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,982 psi | 54% | 1440 fps | 100% |
| Hodgdon VARGET | <<locked>> | 96% | 56,318 psi | 89% | 2497 fps | 99.8% |
| IMR 3031 | <<locked>> | 96% | 57,029 psi | 90% | 2523 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 54,549 psi | 86% | 2461 fps | 99.2% |
| IMR 4166 Enduron | <<locked>> | 96% | 55,695 psi | 88% | 2444 fps | 96.2% |
| IMR 4198 | <<locked>> | 88% | 56,260 psi | 89% | 2379 fps | 100% |
| IMR 4895 | <<locked>> | 98% | 56,202 psi | 89% | 2543 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 92% | 53,737 psi | 85% | 2448 fps | 99.9% |
| Lovex D073.4 | <<locked>> | 82% | 53,490 psi | 85% | 2434 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 53,417 psi | 85% | 2438 fps | 100% |
| Lovex D073.6 | <<locked>> | 96% | 56,391 psi | 89% | 2510 fps | 100% |
| Lovex S060 | <<locked>> | 94% | 54,911 psi | 87% | 2425 fps | 99.5% |
| Lovex S062ᴾ | <<locked>> | 100% | 56,855 psi | 90% | 2500 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 46,267 psi | 73% | 2356 fps | 95.8% |
| Norma 200 | <<locked>> | 84% | 55,216 psi | 88% | 2388 fps | 100% |
| Norma 201 | <<locked>> | 96% | 56,159 psi | 89% | 2480 fps | 100% |
| Norma 202 | <<locked>> | 96% | 56,347 psi | 89% | 2484 fps | 100% |
| Norma 203B | <<locked>> | 98% | 53,824 psi | 85% | 2503 fps | 99.5% |
| Norma URPᴾ | <<locked>> | 100% | 41,162 psi | 65% | 2349 fps | 96% |
| Ramshot Big Game | <<locked>> | 98% | 54,288 psi | 86% | 2526 fps | 99.4% |
| Ramshot TAC | <<locked>> | 92% | 54,317 psi | 86% | 2461 fps | 97.6% |
| Ramshot Wild Boar | <<locked>> | 94% | 56,913 psi | 90% | 2526 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 90% | 55,288 psi | 88% | 2454 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,330 psi | 54% | 1480 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 53,664 psi | 85% | 2438 fps | 100% |
| ReloadSwiss RS 50ᴾ | <<locked>> | 100% | 56,811 psi | 90% | 2500 fps | 97.1% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 54,607 psi | 87% | 2572 fps | 99.3% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 51,010 psi | 81% | 2556 fps | 100% |
| Rottweil R 901 | <<locked>> | 94% | 57,014 psi | 90% | 2464 fps | 100% |
| Rottweil R 902 | <<locked>> | 98% | 56,405 psi | 89% | 2474 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 49,980 psi | 79% | 2448 fps | 99.5% |
| Shooters World AR Plus | <<locked>> | 82% | 53,490 psi | 85% | 2434 fps | 100% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 46,267 psi | 73% | 2356 fps | 95.8% |
| Shooters World Match Rifle | <<locked>> | 96% | 56,391 psi | 89% | 2510 fps | 100% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 56,855 psi | 90% | 2500 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 53,838 psi | 85% | 2411 fps | 99.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 56,739 psi | 90% | 2139 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 56,405 psi | 89% | 2480 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 52,141 psi | 83% | 2507 fps | 99.2% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 56,507 psi | 90% | 2431 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 94% | 55,767 psi | 88% | 2484 fps | 98.3% |
| SNPE Vectan SP 9 | <<locked>> | 96% | 56,028 psi | 89% | 2507 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 55,637 psi | 88% | 2395 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 54,592 psi | 87% | 2385 fps | 100% |
| Somchem S321 | <<locked>> | 90% | 54,853 psi | 87% | 2484 fps | 100% |
| Somchem S335 | <<locked>> | 94% | 54,230 psi | 86% | 2392 fps | 100% |
| Somchem S341 | <<locked>> | 94% | 54,998 psi | 87% | 2477 fps | 99.4% |
| Somchem S355ᴾ | <<locked>> | 100% | 50,908 psi | 81% | 2451 fps | 99.4% |
| Somchem S365ᴾ | <<locked>> | 100% | 36,477 psi | 58% | 2303 fps | 98.1% |
| Vihtavuori N120 | <<locked>> | 82% | 53,925 psi | 85% | 2293 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 55,419 psi | 88% | 2369 fps | 100% |
| Vihtavuori N133 | <<locked>> | 94% | 55,405 psi | 88% | 2382 fps | 100% |
| Vihtavuori N135 | <<locked>> | 98% | 55,042 psi | 87% | 2444 fps | 100% |
| Vihtavuori N140 | <<locked>> | 98% | 56,869 psi | 90% | 2464 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 49,313 psi | 78% | 2395 fps | 99.8% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 43,337 psi | 69% | 2349 fps | 96.5% |
| Vihtavuori N530 | <<locked>> | 92% | 54,288 psi | 86% | 2448 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 98% | 55,071 psi | 87% | 2464 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 42,264 psi | 67% | 2356 fps | 96.1% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 44,860 psi | 71% | 2346 fps | 98.6% |
| Winchester 748 | <<locked>> | 94% | 56,695 psi | 90% | 2533 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 96% | 55,637 psi | 88% | 2513 fps | 99.8% |
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% | 37,724 psi | 60% | 2165 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 49,226 psi | 78% | 2398 fps | 98.3% |
| Accurate 2230 | <<locked>> | 80% | 49,371 psi | 78% | 2405 fps | 98.6% |
| Accurate 2460 | <<locked>> | 80% | 40,741 psi | 65% | 2247 fps | 99.7% |
| Accurate 2495 | <<locked>> | 80% | 29,718 psi | 47% | 2077 fps | 99.8% |
| Accurate 2520 | <<locked>> | 80% | 36,129 psi | 57% | 2205 fps | 99% |
| Accurate 4064 | <<locked>> | 80% | 28,195 psi | 45% | 2057 fps | 98% |
| Accurate 4350 | <<locked>> | 98% | 37,217 psi | 59% | 2297 fps | 95.2% |
| Accurate LT-30 | <<locked>> | 80% | 46,702 psi | 74% | 2244 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 47,079 psi | 75% | 2260 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 34,621 psi | 55% | 2162 fps | 95.7% |
| ADI AR 2207 | <<locked>> | 80% | 50,676 psi | 80% | 2297 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 35,708 psi | 57% | 2169 fps | 95.1% |
| ADI AR 2219 | <<locked>> | 80% | 45,890 psi | 73% | 2336 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 36,666 psi | 58% | 2178 fps | 97.6% |
| Alliant AR-Comp | <<locked>> | 80% | 35,259 psi | 56% | 2188 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 42,163 psi | 67% | 2343 fps | 98.4% |
| Alliant Power Pro 2000-MR | 47.7 gr | 86% | 38,276 psi | 61% | 2316 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 30,168 psi | 48% | 2093 fps | 95.2% |
| Alliant Reloder-10x | <<locked>> | 80% | 43,250 psi | 69% | 2254 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 34,998 psi | 55% | 2192 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 98% | 39,146 psi | 62% | 2313 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 90% | 34,098 psi | 54% | 2238 fps | 95.5% |
| Alliant Reloder-7 | <<locked>> | 80% | 51,663 psi | 82% | 2316 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 45,266 psi | 72% | 2241 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 38,348 psi | 61% | 2254 fps | 95.5% |
| Bofors RP3 | <<locked>> | 84% | 31,227 psi | 49% | 2133 fps | 95.8% |
| Hodgdon Benchmark | <<locked>> | 80% | 38,986 psi | 62% | 2182 fps | 98.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 34,229 psi | 54% | 2185 fps | 97.6% |
| Hodgdon CFE223 | 45.4 gr | 80% | 38,029 psi | 60% | 2297 fps | 96.1% |
| Hodgdon H322 | <<locked>> | 80% | 41,930 psi | 66% | 2277 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 42,438 psi | 67% | 2297 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 90% | 40,161 psi | 64% | 2280 fps | 95.3% |
| Hodgdon H4198 | <<locked>> | 80% | 51,474 psi | 82% | 2323 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 34,838 psi | 55% | 2172 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 33,170 psi | 53% | 2169 fps | 95.3% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 31,067 psi | 49% | 2136 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,135 psi | 40% | 1286 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 33,779 psi | 54% | 2136 fps | 95.9% |
| IMR 3031 | <<locked>> | 80% | 33,489 psi | 53% | 2182 fps | 99.9% |
| IMR 4064 | <<locked>> | 84% | 35,143 psi | 56% | 2152 fps | 95.3% |
| IMR 4166 Enduron | <<locked>> | 94% | 52,489 psi | 83% | 2402 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 44,280 psi | 70% | 2228 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 33,576 psi | 53% | 2175 fps | 95.5% |
| IMR 8208 XBR | <<locked>> | 80% | 36,666 psi | 58% | 2178 fps | 97.6% |
| Lovex D073.4 | <<locked>> | 80% | 49,864 psi | 79% | 2388 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 40,625 psi | 64% | 2251 fps | 99.2% |
| Lovex D073.6 | <<locked>> | 80% | 32,503 psi | 52% | 2146 fps | 98.2% |
| Lovex S060 | <<locked>> | 80% | 35,882 psi | 57% | 2123 fps | 96% |
| Lovex S062 | <<locked>> | 80% | 30,414 psi | 48% | 2067 fps | 95.8% |
| Lovex S065 | <<locked>> | 98% | 43,540 psi | 69% | 2313 fps | 95.2% |
| Norma 200 | <<locked>> | 80% | 48,486 psi | 77% | 2306 fps | 100% |
| Norma 201 | <<locked>> | 80% | 33,823 psi | 54% | 2126 fps | 96.9% |
| Norma 202 | <<locked>> | 80% | 34,011 psi | 54% | 2146 fps | 99% |
| Norma 203B | <<locked>> | 84% | 34,301 psi | 54% | 2182 fps | 95.6% |
| Norma URP | <<locked>> | 98% | 38,421 psi | 61% | 2300 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 84% | 34,084 psi | 54% | 2192 fps | 95.1% |
| Ramshot TAC | <<locked>> | 86% | 44,744 psi | 71% | 2320 fps | 95.7% |
| Ramshot Wild Boar | <<locked>> | 80% | 35,491 psi | 56% | 2192 fps | 95.9% |
| Ramshot X-Terminator | <<locked>> | 80% | 39,827 psi | 63% | 2221 fps | 97% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,324 psi | 40% | 1319 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 41,205 psi | 65% | 2257 fps | 99.4% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 46,775 psi | 74% | 2362 fps | 95.1% |
| ReloadSwiss RS 52 | 45.1 gr | 84% | 36,056 psi | 57% | 2270 fps | 95.5% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 28,166 psi | 45% | 2096 fps | 95.4% |
| Rottweil R 901 | <<locked>> | 80% | 37,449 psi | 59% | 2178 fps | 99.4% |
| Rottweil R 902 | <<locked>> | 80% | 32,126 psi | 51% | 2083 fps | 96.3% |
| Rottweil R 903 | <<locked>> | 86% | 31,386 psi | 50% | 2129 fps | 95.4% |
| Shooters World AR Plus | <<locked>> | 80% | 49,864 psi | 79% | 2388 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 98% | 43,540 psi | 69% | 2313 fps | 95.2% |
| Shooters World Match Rifle | <<locked>> | 80% | 32,503 psi | 52% | 2146 fps | 98.2% |
| Shooters World Precision | <<locked>> | 80% | 30,414 psi | 48% | 2067 fps | 95.8% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 43,598 psi | 69% | 2270 fps | 98.7% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 51,140 psi | 81% | 2080 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 46,238 psi | 73% | 2346 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 88% | 35,404 psi | 56% | 2224 fps | 95.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 44,106 psi | 70% | 2270 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 86% | 42,163 psi | 67% | 2287 fps | 95.7% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 33,330 psi | 53% | 2136 fps | 95.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 35,955 psi | 57% | 2110 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 29,196 psi | 46% | 1991 fps | 98.6% |
| Somchem S321 | <<locked>> | 80% | 39,044 psi | 62% | 2247 fps | 98.5% |
| Somchem S335 | <<locked>> | 80% | 35,128 psi | 56% | 2110 fps | 99.6% |
| Somchem S341 | <<locked>> | 80% | 34,069 psi | 54% | 2146 fps | 95.3% |
| Somchem S355 | <<locked>> | 86% | 32,750 psi | 52% | 2139 fps | 95.6% |
| Somchem S365 | <<locked>> | 94% | 30,153 psi | 48% | 2159 fps | 95.7% |
| Vihtavuori N120 | <<locked>> | 80% | 50,633 psi | 80% | 2254 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 40,944 psi | 65% | 2178 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 36,013 psi | 57% | 2113 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 30,995 psi | 49% | 2087 fps | 99.9% |
| Vihtavuori N140 | <<locked>> | 80% | 32,039 psi | 51% | 2090 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 84% | 29,022 psi | 46% | 2044 fps | 95.8% |
| Vihtavuori N160 | <<locked>> | 96% | 38,290 psi | 61% | 2260 fps | 95% |
| Vihtavuori N530 | <<locked>> | 80% | 36,506 psi | 58% | 2175 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 80% | 30,589 psi | 48% | 2077 fps | 98% |
| Vihtavuori N550 | <<locked>> | 98% | 39,523 psi | 63% | 2306 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 34,403 psi | 55% | 2156 fps | 95.7% |
| Winchester 748 | <<locked>> | 80% | 35,230 psi | 56% | 2208 fps | 98.2% |
| Winchester StaBALL Match | <<locked>> | 80% | 32,285 psi | 51% | 2133 fps | 95.5% |
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 99 powders for .338-06 A-Square loaded with the .338 | 231gr | Lapua Naturalis. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,575 fps; across all powders the maximum-charge window runs from 1,440 fps to 2,575 fps. Accurate 4064 gives the best case fill at 100 %, and 99 of the 99 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 231.0 gr projectile in 0.338" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 4064, Accurate 4350, ADI AR 2208 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 CFE223 rank at the top here: for .338-06 A-Square with the .338 | 231gr | Lapua Naturalis 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.