Load Specifications
Bullet Manufacturer:Berger
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:1:11.5
Load data in caliber .338-06 A-Square with .338 | 250gr | Berger Hybrid OTM bullet and 100 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.
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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% | 54,998 psi | 87% | 2257 fps | 100% |
| Accurate 2200 | <<locked>> | 84% | 55,767 psi | 88% | 2339 fps | 99.2% |
| Accurate 2230 | <<locked>> | 84% | 56,637 psi | 90% | 2352 fps | 99.5% |
| Accurate 2460 | <<locked>> | 88% | 53,577 psi | 85% | 2283 fps | 100% |
| Accurate 2495 | <<locked>> | 98% | 54,621 psi | 87% | 2306 fps | 100% |
| Accurate 2520 | <<locked>> | 92% | 54,752 psi | 87% | 2333 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 53,969 psi | 86% | 2339 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 39,914 psi | 63% | 2211 fps | 96.3% |
| Accurate LT-30 | <<locked>> | 86% | 56,028 psi | 89% | 2218 fps | 100% |
| Accurate LT-32 | <<locked>> | 86% | 56,463 psi | 89% | 2238 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 53,693 psi | 85% | 2333 fps | 99.5% |
| ADI AR 2207 | <<locked>> | 82% | 53,737 psi | 85% | 2192 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 54,650 psi | 87% | 2326 fps | 99.2% |
| ADI AR 2219 | <<locked>> | 86% | 55,898 psi | 89% | 2320 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 94% | 56,652 psi | 90% | 2339 fps | 100% |
| Alliant AR-Comp | <<locked>> | 94% | 55,956 psi | 89% | 2320 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 88% | 54,766 psi | 87% | 2385 fps | 99.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 98% | 56,927 psi | 90% | 2474 fps | 99.4% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 53,316 psi | 85% | 2346 fps | 99.8% |
| Alliant Reloder-10x | <<locked>> | 88% | 55,405 psi | 88% | 2267 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 98% | 54,302 psi | 86% | 2362 fps | 99.3% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 41,307 psi | 65% | 2218 fps | 96.4% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 47,268 psi | 75% | 2349 fps | 99.2% |
| Alliant Reloder-7 | <<locked>> | 82% | 54,868 psi | 87% | 2208 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 54,752 psi | 87% | 2221 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 96% | 56,840 psi | 90% | 2388 fps | 99.2% |
| Bofors RP3ᴾ | <<locked>> | 100% | 53,505 psi | 85% | 2359 fps | 99.9% |
| Hodgdon Benchmark | <<locked>> | 92% | 55,811 psi | 88% | 2287 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 94% | 54,984 psi | 87% | 2365 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 92% | 57,087 psi | 90% | 2448 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 88% | 54,375 psi | 86% | 2303 fps | 100% |
| Hodgdon H335 | <<locked>> | 88% | 55,419 psi | 88% | 2329 fps | 100% |
| Hodgdon H380ᴾ | <<locked>> | 100% | 55,506 psi | 88% | 2365 fps | 98.5% |
| Hodgdon H4198 | <<locked>> | 82% | 54,447 psi | 86% | 2215 fps | 100% |
| Hodgdon H4895 | <<locked>> | 94% | 54,085 psi | 86% | 2343 fps | 99.8% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 37,550 psi | 60% | 2126 fps | 97.1% |
| Hodgdon LEVERevolution | <<locked>> | 98% | 55,869 psi | 89% | 2411 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,185 psi | 54% | 1345 fps | 100% |
| Hodgdon VARGET | <<locked>> | 96% | 55,695 psi | 88% | 2346 fps | 99.8% |
| IMR 3031 | <<locked>> | 96% | 56,652 psi | 90% | 2372 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 54,288 psi | 86% | 2316 fps | 99.3% |
| IMR 4166 Enduron | <<locked>> | 96% | 55,477 psi | 88% | 2297 fps | 96.3% |
| IMR 4198 | <<locked>> | 88% | 55,854 psi | 89% | 2228 fps | 100% |
| IMR 4831ᴾ | <<locked>> | 100% | 38,841 psi | 62% | 2172 fps | 95.9% |
| IMR 4895 | <<locked>> | 98% | 55,666 psi | 88% | 2388 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 94% | 56,652 psi | 90% | 2339 fps | 100% |
| Lovex D073.4 | <<locked>> | 82% | 53,374 psi | 85% | 2287 fps | 100% |
| Lovex D073.5 | <<locked>> | 90% | 56,985 psi | 90% | 2333 fps | 100% |
| Lovex D073.6 | <<locked>> | 96% | 56,057 psi | 89% | 2359 fps | 100% |
| Lovex S060 | <<locked>> | 94% | 54,476 psi | 86% | 2277 fps | 99.5% |
| Lovex S062ᴾ | <<locked>> | 100% | 56,666 psi | 90% | 2352 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 45,992 psi | 73% | 2215 fps | 96% |
| Norma 200 | <<locked>> | 84% | 55,100 psi | 87% | 2241 fps | 100% |
| Norma 201 | <<locked>> | 96% | 55,912 psi | 89% | 2329 fps | 100% |
| Norma 202 | <<locked>> | 96% | 55,985 psi | 89% | 2333 fps | 100% |
| Norma 203Bᴾ | <<locked>> | 100% | 57,029 psi | 90% | 2395 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 41,002 psi | 65% | 2215 fps | 96.2% |
| Ramshot Big Game | <<locked>> | 98% | 54,012 psi | 86% | 2379 fps | 99.4% |
| Ramshot TAC | <<locked>> | 92% | 54,070 psi | 86% | 2313 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 94% | 56,347 psi | 89% | 2372 fps | 99.7% |
| Ramshot X-Terminator | <<locked>> | 90% | 54,940 psi | 87% | 2306 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,389 psi | 55% | 1378 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 90% | 56,898 psi | 90% | 2333 fps | 100% |
| ReloadSwiss RS 50ᴾ | <<locked>> | 100% | 56,507 psi | 90% | 2349 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 54,114 psi | 86% | 2418 fps | 99.3% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 50,546 psi | 80% | 2402 fps | 100% |
| Rottweil R 901 | <<locked>> | 94% | 57,000 psi | 90% | 2316 fps | 100% |
| Rottweil R 902 | <<locked>> | 98% | 56,231 psi | 89% | 2326 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 49,806 psi | 79% | 2306 fps | 99.5% |
| Shooters World AR Plus | <<locked>> | 82% | 53,374 psi | 85% | 2287 fps | 100% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 45,992 psi | 73% | 2215 fps | 96% |
| Shooters World Match Rifle | <<locked>> | 96% | 56,057 psi | 89% | 2359 fps | 100% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 56,666 psi | 90% | 2352 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 53,490 psi | 85% | 2267 fps | 99.8% |
| SNPE Vectan BA6 1/2 | <<locked>> | 84% | 56,666 psi | 90% | 2005 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 86% | 56,014 psi | 89% | 2329 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 51,721 psi | 82% | 2356 fps | 99.3% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 56,101 psi | 89% | 2277 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 94% | 55,405 psi | 88% | 2333 fps | 98.4% |
| SNPE Vectan SP 9 | <<locked>> | 96% | 55,695 psi | 88% | 2356 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 55,172 psi | 87% | 2244 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 54,244 psi | 86% | 2241 fps | 100% |
| Somchem S321 | <<locked>> | 90% | 54,607 psi | 87% | 2336 fps | 100% |
| Somchem S335 | <<locked>> | 94% | 54,070 psi | 86% | 2247 fps | 100% |
| Somchem S341 | <<locked>> | 94% | 54,505 psi | 86% | 2329 fps | 99.5% |
| Somchem S355ᴾ | <<locked>> | 100% | 50,560 psi | 80% | 2303 fps | 99.5% |
| Somchem S365ᴾ | <<locked>> | 100% | 36,332 psi | 58% | 2169 fps | 98.3% |
| Vihtavuori N120 | <<locked>> | 84% | 56,985 psi | 90% | 2182 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 55,085 psi | 87% | 2221 fps | 100% |
| Vihtavuori N133 | <<locked>> | 94% | 54,882 psi | 87% | 2234 fps | 100% |
| Vihtavuori N135 | <<locked>> | 98% | 54,737 psi | 87% | 2297 fps | 100% |
| Vihtavuori N140 | <<locked>> | 98% | 56,565 psi | 90% | 2316 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 49,066 psi | 78% | 2254 fps | 99.9% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 43,279 psi | 69% | 2215 fps | 96.6% |
| Vihtavuori N530 | <<locked>> | 92% | 54,114 psi | 86% | 2303 fps | 99.9% |
| Vihtavuori N540 | <<locked>> | 98% | 54,563 psi | 86% | 2316 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 41,989 psi | 67% | 2218 fps | 96.2% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 44,657 psi | 71% | 2208 fps | 98.7% |
| Winchester 748 | <<locked>> | 94% | 56,144 psi | 89% | 2379 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 96% | 55,230 psi | 88% | 2365 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% | 38,203 psi | 61% | 2041 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 48,994 psi | 78% | 2251 fps | 98.4% |
| Accurate 2230 | <<locked>> | 80% | 49,095 psi | 78% | 2257 fps | 98.7% |
| Accurate 2460 | <<locked>> | 80% | 41,046 psi | 65% | 2119 fps | 99.8% |
| Accurate 2495 | <<locked>> | 80% | 30,530 psi | 48% | 1969 fps | 99.9% |
| Accurate 2520 | <<locked>> | 80% | 36,434 psi | 58% | 2080 fps | 99.2% |
| Accurate 4064 | <<locked>> | 80% | 28,935 psi | 46% | 1952 fps | 98.4% |
| Accurate 4350 | <<locked>> | 98% | 37,101 psi | 59% | 2162 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 46,572 psi | 74% | 2106 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 46,949 psi | 74% | 2123 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 34,867 psi | 55% | 2041 fps | 96% |
| ADI AR 2207 | <<locked>> | 80% | 50,937 psi | 81% | 2159 fps | 100% |
| ADI AR 2208 | <<locked>> | 86% | 35,955 psi | 57% | 2047 fps | 95.5% |
| ADI AR 2219 | <<locked>> | 80% | 45,861 psi | 73% | 2198 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 36,811 psi | 58% | 2054 fps | 97.9% |
| Alliant AR-Comp | <<locked>> | 80% | 35,360 psi | 56% | 2060 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 42,250 psi | 67% | 2208 fps | 98.6% |
| Alliant Power Pro 2000-MR | 43.3 gr | 86% | 38,203 psi | 61% | 2178 fps | 95.6% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 30,313 psi | 48% | 1975 fps | 95.6% |
| Alliant Reloder-10x | <<locked>> | 80% | 43,424 psi | 69% | 2119 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 35,186 psi | 56% | 2067 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 98% | 38,972 psi | 62% | 2175 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 90% | 34,156 psi | 54% | 2110 fps | 95.9% |
| Alliant Reloder-7 | <<locked>> | 80% | 51,692 psi | 82% | 2175 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 45,208 psi | 72% | 2106 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 35,955 psi | 57% | 2080 fps | 95% |
| Bofors RP3 | <<locked>> | 82% | 29,559 psi | 47% | 1972 fps | 95.4% |
| Hodgdon Benchmark | <<locked>> | 80% | 39,001 psi | 62% | 2054 fps | 98.8% |
| Hodgdon BL-C2 | <<locked>> | 80% | 34,548 psi | 55% | 2064 fps | 97.9% |
| Hodgdon CFE223 | 41.2 gr | 80% | 37,927 psi | 60% | 2162 fps | 96.4% |
| Hodgdon H322 | <<locked>> | 80% | 41,959 psi | 67% | 2142 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 42,351 psi | 67% | 2159 fps | 100% |
| Hodgdon H380 | <<locked>> | 90% | 40,147 psi | 64% | 2149 fps | 95.5% |
| Hodgdon H4198 | <<locked>> | 80% | 51,256 psi | 81% | 2178 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 35,085 psi | 56% | 2051 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 33,344 psi | 53% | 2044 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 31,227 psi | 49% | 2014 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,309 psi | 40% | 1201 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 33,910 psi | 54% | 2014 fps | 96.3% |
| IMR 3031 | <<locked>> | 80% | 33,620 psi | 53% | 2054 fps | 99.9% |
| IMR 4064 | <<locked>> | 84% | 35,259 psi | 56% | 2028 fps | 95.6% |
| IMR 4166 Enduron | <<locked>> | 92% | 49,095 psi | 78% | 2211 fps | 95% |
| IMR 4198 | <<locked>> | 80% | 44,324 psi | 70% | 2093 fps | 100% |
| IMR 4831 | <<locked>> | 98% | 36,332 psi | 58% | 2126 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 31,618 psi | 50% | 2005 fps | 95% |
| IMR 8208 XBR | <<locked>> | 80% | 36,811 psi | 58% | 2054 fps | 97.9% |
| Lovex D073.4 | <<locked>> | 80% | 49,835 psi | 79% | 2244 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 40,857 psi | 65% | 2123 fps | 99.3% |
| Lovex D073.6 | <<locked>> | 80% | 32,866 psi | 52% | 2024 fps | 98.5% |
| Lovex S060 | <<locked>> | 80% | 36,085 psi | 57% | 1998 fps | 96.4% |
| Lovex S062 | <<locked>> | 80% | 30,792 psi | 49% | 1952 fps | 96.2% |
| Lovex S065 | <<locked>> | 98% | 43,395 psi | 69% | 2175 fps | 95.3% |
| Norma 200 | <<locked>> | 80% | 48,921 psi | 78% | 2172 fps | 100% |
| Norma 201 | <<locked>> | 80% | 34,287 psi | 54% | 2008 fps | 97.3% |
| Norma 202 | <<locked>> | 80% | 34,156 psi | 54% | 2021 fps | 99.2% |
| Norma 203B | <<locked>> | 82% | 32,460 psi | 51% | 2018 fps | 95.3% |
| Norma URP | <<locked>> | 98% | 38,435 psi | 61% | 2169 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 84% | 34,113 psi | 54% | 2064 fps | 95.4% |
| Ramshot TAC | <<locked>> | 84% | 41,756 psi | 66% | 2136 fps | 95.1% |
| Ramshot Wild Boar | <<locked>> | 80% | 35,549 psi | 56% | 2064 fps | 96.2% |
| Ramshot X-Terminator | <<locked>> | 80% | 40,074 psi | 64% | 2093 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,599 psi | 41% | 1230 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 41,510 psi | 66% | 2129 fps | 99.6% |
| ReloadSwiss RS 50 | <<locked>> | 94% | 46,456 psi | 74% | 2218 fps | 95.2% |
| ReloadSwiss RS 52 | 40 gr | 82% | 33,837 psi | 54% | 2093 fps | 95% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 28,471 psi | 45% | 1985 fps | 96% |
| Rottweil R 901 | <<locked>> | 80% | 37,826 psi | 60% | 2051 fps | 99.5% |
| Rottweil R 902 | <<locked>> | 80% | 32,735 psi | 52% | 1972 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 84% | 29,675 psi | 47% | 1969 fps | 95.1% |
| Shooters World AR Plus | <<locked>> | 80% | 49,835 psi | 79% | 2244 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 98% | 43,395 psi | 69% | 2175 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 32,866 psi | 52% | 2024 fps | 98.5% |
| Shooters World Precision | <<locked>> | 80% | 30,792 psi | 49% | 1952 fps | 96.2% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 43,801 psi | 69% | 2136 fps | 98.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 50,981 psi | 81% | 1949 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 46,122 psi | 73% | 2205 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 33,330 psi | 53% | 2054 fps | 95.2% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 44,135 psi | 70% | 2133 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 39,465 psi | 63% | 2110 fps | 95.1% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 33,576 psi | 53% | 2018 fps | 95.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 36,216 psi | 57% | 1985 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 29,486 psi | 47% | 1880 fps | 98.9% |
| Somchem S321 | <<locked>> | 80% | 39,146 psi | 62% | 2116 fps | 98.6% |
| Somchem S335 | <<locked>> | 80% | 35,520 psi | 56% | 1991 fps | 99.7% |
| Somchem S341 | <<locked>> | 80% | 34,185 psi | 54% | 2024 fps | 95.6% |
| Somchem S355 | <<locked>> | 84% | 30,850 psi | 49% | 1978 fps | 95.2% |
| Somchem S365 | <<locked>> | 92% | 28,587 psi | 45% | 1995 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 50,894 psi | 81% | 2119 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 41,133 psi | 65% | 2047 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 36,201 psi | 57% | 1988 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 31,299 psi | 50% | 1969 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 32,198 psi | 51% | 1972 fps | 99.1% |
| Vihtavuori N150 | <<locked>> | 82% | 27,514 psi | 44% | 1890 fps | 95.4% |
| Vihtavuori N160 | <<locked>> | 96% | 38,218 psi | 61% | 2129 fps | 95.2% |
| Vihtavuori N530 | <<locked>> | 80% | 36,550 psi | 58% | 2047 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 80% | 30,864 psi | 49% | 1959 fps | 98.3% |
| Vihtavuori N550 | <<locked>> | 98% | 39,363 psi | 62% | 2172 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 32,445 psi | 51% | 1991 fps | 95.1% |
| Winchester 748 | <<locked>> | 80% | 35,346 psi | 56% | 2080 fps | 98.4% |
| Winchester StaBALL Match | <<locked>> | 80% | 32,518 psi | 52% | 2014 fps | 95.9% |
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 100 powders for .338-06 A-Square loaded with the .338 | 250gr | Berger Hybrid OTM. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,474 fps; across all powders the maximum-charge window runs from 1,345 fps to 2,474 fps. Accurate 4064 gives the best case fill at 100 %, and 100 of the 100 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 1:11.5 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 | 250gr | Berger Hybrid OTM 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.