Load Specifications
Bullet:.338 | 250gr | Norma GTX
Bullet Manufacturer:Norma
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:1:12.5
Load data in caliber .338-06 A-Square with .338 | 250gr | Norma GTX bullet and 102 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, Hodgdon CFE223 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>> | 92% | 56,768 psi | 90% | 2290 fps | 100% |
| Accurate 2200 | <<locked>> | 82% | 53,534 psi | 85% | 2326 fps | 99.1% |
| Accurate 2230 | <<locked>> | 82% | 54,244 psi | 86% | 2339 fps | 99.4% |
| Accurate 2460 | <<locked>> | 88% | 55,129 psi | 87% | 2316 fps | 100% |
| Accurate 2495 | <<locked>> | 98% | 56,739 psi | 90% | 2339 fps | 100% |
| Accurate 2520 | <<locked>> | 92% | 56,246 psi | 89% | 2362 fps | 100% |
| Accurate 4064ᴾ | <<locked>> | 100% | 55,912 psi | 89% | 2372 fps | 100% |
| Accurate 4350ᴾ | <<locked>> | 100% | 41,510 psi | 66% | 2251 fps | 96.9% |
| Accurate LT-30 | <<locked>> | 86% | 56,985 psi | 90% | 2241 fps | 100% |
| Accurate LT-32 | <<locked>> | 84% | 54,186 psi | 86% | 2228 fps | 100% |
| ADI AR 2206H | <<locked>> | 94% | 55,434 psi | 88% | 2369 fps | 99.7% |
| ADI AR 2207 | <<locked>> | 82% | 55,100 psi | 87% | 2218 fps | 100% |
| ADI AR 2208ᴾ | <<locked>> | 100% | 56,275 psi | 89% | 2362 fps | 99.4% |
| ADI AR 2219 | <<locked>> | 84% | 53,606 psi | 85% | 2306 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 92% | 54,839 psi | 87% | 2333 fps | 100% |
| Alliant AR-Comp | <<locked>> | 92% | 54,041 psi | 86% | 2310 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 88% | 56,623 psi | 90% | 2421 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 96% | 54,694 psi | 87% | 2461 fps | 99.4% |
| Alliant Reloder- TS 15.5ᴾ | <<locked>> | 100% | 55,027 psi | 87% | 2379 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 88% | 56,579 psi | 90% | 2293 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 98% | 55,999 psi | 89% | 2398 fps | 99.6% |
| Alliant Reloder-16ᴾ | <<locked>> | 100% | 42,569 psi | 67% | 2257 fps | 97.1% |
| Alliant Reloder-17ᴾ | <<locked>> | 100% | 48,805 psi | 77% | 2385 fps | 99.5% |
| Alliant Reloder-7 | <<locked>> | 82% | 56,072 psi | 89% | 2234 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 56,057 psi | 89% | 2251 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 94% | 55,114 psi | 87% | 2385 fps | 99.2% |
| Bofors RP3ᴾ | <<locked>> | 100% | 55,230 psi | 88% | 2392 fps | 100% |
| Hodgdon Benchmark | <<locked>> | 90% | 54,157 psi | 86% | 2283 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 94% | 57,072 psi | 90% | 2405 fps | 100% |
| Hodgdon CFE223 | <<locked>> | 90% | 55,158 psi | 87% | 2438 fps | 99.6% |
| Hodgdon H322 | <<locked>> | 88% | 55,767 psi | 88% | 2333 fps | 100% |
| Hodgdon H335 | <<locked>> | 88% | 56,942 psi | 90% | 2359 fps | 100% |
| Hodgdon H380 | <<locked>> | 98% | 53,809 psi | 85% | 2362 fps | 98.5% |
| Hodgdon H4198 | <<locked>> | 82% | 55,912 psi | 89% | 2244 fps | 100% |
| Hodgdon H4895 | <<locked>> | 94% | 55,927 psi | 89% | 2379 fps | 99.9% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 38,754 psi | 61% | 2162 fps | 97.7% |
| Hodgdon LEVERevolution | <<locked>> | 96% | 53,882 psi | 85% | 2402 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,389 psi | 55% | 1362 fps | 100% |
| Hodgdon VARGET | <<locked>> | 94% | 53,896 psi | 85% | 2336 fps | 99.8% |
| IMR 3031 | <<locked>> | 94% | 54,607 psi | 87% | 2362 fps | 100% |
| IMR 4064 | <<locked>> | 98% | 55,680 psi | 88% | 2346 fps | 99.5% |
| IMR 4166 Enduron | <<locked>> | 96% | 56,927 psi | 90% | 2333 fps | 96.9% |
| IMR 4198 | <<locked>> | 86% | 54,201 psi | 86% | 2224 fps | 100% |
| IMR 4451 Enduronᴾ | <<locked>> | 100% | 52,141 psi | 83% | 2303 fps | 95.9% |
| IMR 4831ᴾ | <<locked>> | 100% | 40,161 psi | 64% | 2208 fps | 96.6% |
| IMR 4895 | <<locked>> | 96% | 54,172 psi | 86% | 2385 fps | 99.7% |
| IMR 8208 XBR | <<locked>> | 92% | 54,839 psi | 87% | 2333 fps | 100% |
| Lovex D073.4 | <<locked>> | 82% | 55,071 psi | 87% | 2320 fps | 100% |
| Lovex D073.5 | <<locked>> | 88% | 55,085 psi | 87% | 2326 fps | 100% |
| Lovex D073.6 | <<locked>> | 94% | 54,157 psi | 86% | 2349 fps | 100% |
| Lovex S060 | <<locked>> | 94% | 55,825 psi | 88% | 2306 fps | 99.7% |
| Lovex S062 | <<locked>> | 98% | 54,795 psi | 87% | 2343 fps | 100% |
| Lovex S065ᴾ | <<locked>> | 100% | 47,427 psi | 75% | 2251 fps | 96.6% |
| Norma 200 | <<locked>> | 84% | 56,681 psi | 90% | 2270 fps | 100% |
| Norma 201 | <<locked>> | 94% | 54,157 psi | 86% | 2323 fps | 100% |
| Norma 202 | <<locked>> | 94% | 54,273 psi | 86% | 2326 fps | 100% |
| Norma 203B | <<locked>> | 98% | 55,071 psi | 87% | 2385 fps | 99.7% |
| Norma URPᴾ | <<locked>> | 100% | 42,380 psi | 67% | 2251 fps | 96.9% |
| Ramshot Big Game | <<locked>> | 98% | 55,448 psi | 88% | 2411 fps | 99.7% |
| Ramshot TAC | <<locked>> | 92% | 55,492 psi | 88% | 2346 fps | 98.2% |
| Ramshot Wild Boar | <<locked>> | 92% | 54,447 psi | 86% | 2365 fps | 99.6% |
| Ramshot X-Terminator | <<locked>> | 90% | 56,521 psi | 90% | 2339 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,592 psi | 55% | 1394 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 54,839 psi | 87% | 2323 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 98% | 54,723 psi | 87% | 2346 fps | 97.2% |
| ReloadSwiss RS 52 | <<locked>> | 96% | 55,941 psi | 89% | 2454 fps | 99.6% |
| ReloadSwiss RS 60ᴾ | <<locked>> | 100% | 52,170 psi | 83% | 2441 fps | 100% |
| ReloadSwiss RS 62ᴾ | <<locked>> | 100% | 41,582 psi | 66% | 2264 fps | 96.4% |
| Rottweil R 901 | <<locked>> | 92% | 55,463 psi | 88% | 2310 fps | 100% |
| Rottweil R 902 | <<locked>> | 96% | 54,447 psi | 86% | 2320 fps | 100% |
| Rottweil R 903ᴾ | <<locked>> | 100% | 51,532 psi | 82% | 2339 fps | 99.7% |
| Shooters World AR Plus | <<locked>> | 82% | 55,071 psi | 87% | 2320 fps | 100% |
| Shooters World Long Rifleᴾ | <<locked>> | 100% | 47,427 psi | 75% | 2251 fps | 96.6% |
| Shooters World Match Rifle | <<locked>> | 94% | 54,157 psi | 86% | 2349 fps | 100% |
| Shooters World Precision | <<locked>> | 98% | 54,795 psi | 87% | 2343 fps | 100% |
| Shooters World Tactical Rifle | <<locked>> | 86% | 54,911 psi | 87% | 2297 fps | 99.9% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 54,853 psi | 87% | 1998 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 53,998 psi | 86% | 2320 fps | 100% |
| SNPE Vectan SP 11ᴾ | <<locked>> | 100% | 53,447 psi | 85% | 2392 fps | 99.6% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 54,346 psi | 86% | 2274 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 94% | 57,000 psi | 90% | 2369 fps | 98.7% |
| SNPE Vectan SP 9 | <<locked>> | 94% | 53,795 psi | 85% | 2346 fps | 99.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 56,797 psi | 90% | 2277 fps | 100% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 56,014 psi | 89% | 2274 fps | 100% |
| Somchem S321 | <<locked>> | 90% | 56,231 psi | 89% | 2369 fps | 100% |
| Somchem S335 | <<locked>> | 94% | 55,463 psi | 88% | 2277 fps | 100% |
| Somchem S341 | <<locked>> | 94% | 56,463 psi | 89% | 2365 fps | 99.7% |
| Somchem S355ᴾ | <<locked>> | 100% | 52,214 psi | 83% | 2336 fps | 99.7% |
| Somchem S365ᴾ | <<locked>> | 100% | 37,478 psi | 59% | 2205 fps | 98.8% |
| Vihtavuori N120 | <<locked>> | 82% | 55,013 psi | 87% | 2175 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 56,797 psi | 90% | 2251 fps | 100% |
| Vihtavuori N133 | <<locked>> | 94% | 56,521 psi | 90% | 2264 fps | 100% |
| Vihtavuori N135 | <<locked>> | 98% | 56,463 psi | 89% | 2326 fps | 100% |
| Vihtavuori N140 | <<locked>> | 96% | 54,650 psi | 87% | 2306 fps | 100% |
| Vihtavuori N150ᴾ | <<locked>> | 100% | 50,604 psi | 80% | 2287 fps | 100% |
| Vihtavuori N160ᴾ | <<locked>> | 100% | 44,643 psi | 71% | 2251 fps | 97.2% |
| Vihtavuori N530 | <<locked>> | 92% | 55,608 psi | 88% | 2333 fps | 100% |
| Vihtavuori N540 | <<locked>> | 98% | 56,478 psi | 90% | 2349 fps | 100% |
| Vihtavuori N550ᴾ | <<locked>> | 100% | 43,540 psi | 69% | 2257 fps | 96.9% |
| Winchester 6.5 StaBALLᴾ | <<locked>> | 100% | 45,919 psi | 73% | 2241 fps | 99% |
| Winchester 748 | <<locked>> | 92% | 54,273 psi | 86% | 2372 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 96% | 56,797 psi | 90% | 2395 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% | 39,291 psi | 62% | 2070 fps | 100% |
| Accurate 2200 | <<locked>> | 80% | 50,444 psi | 80% | 2287 fps | 98.8% |
| Accurate 2230 | <<locked>> | 80% | 50,778 psi | 80% | 2297 fps | 99.1% |
| Accurate 2460 | <<locked>> | 80% | 42,293 psi | 67% | 2149 fps | 99.9% |
| Accurate 2495 | <<locked>> | 80% | 31,618 psi | 50% | 1995 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 37,637 psi | 60% | 2113 fps | 99.5% |
| Accurate 4064 | <<locked>> | 80% | 29,936 psi | 47% | 1982 fps | 98.8% |
| Accurate 4350 | <<locked>> | 96% | 36,260 psi | 57% | 2162 fps | 95.4% |
| Accurate LT-30 | <<locked>> | 80% | 47,616 psi | 75% | 2133 fps | 100% |
| Accurate LT-32 | <<locked>> | 80% | 48,008 psi | 76% | 2149 fps | 100% |
| ADI AR 2206H | <<locked>> | 80% | 36,013 psi | 57% | 2073 fps | 96.6% |
| ADI AR 2207 | <<locked>> | 80% | 51,967 psi | 82% | 2182 fps | 100% |
| ADI AR 2208 | <<locked>> | 84% | 34,693 psi | 55% | 2034 fps | 95.3% |
| ADI AR 2219 | <<locked>> | 80% | 46,963 psi | 74% | 2224 fps | 100% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,000 psi | 60% | 2087 fps | 98.3% |
| Alliant AR-Comp | <<locked>> | 80% | 36,521 psi | 58% | 2087 fps | 100% |
| Alliant Power Pro 1200-R | <<locked>> | 80% | 43,714 psi | 69% | 2244 fps | 99% |
| Alliant Power Pro 2000-MR | 43.6 gr | 84% | 36,883 psi | 58% | 2169 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 29,399 psi | 47% | 1965 fps | 95.4% |
| Alliant Reloder-10x | <<locked>> | 80% | 44,672 psi | 71% | 2149 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 33,968 psi | 54% | 2054 fps | 95.4% |
| Alliant Reloder-16 | <<locked>> | 96% | 37,797 psi | 60% | 2169 fps | 95.5% |
| Alliant Reloder-17 | <<locked>> | 88% | 33,214 psi | 53% | 2106 fps | 95.8% |
| Alliant Reloder-7 | <<locked>> | 80% | 52,895 psi | 84% | 2198 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 46,267 psi | 73% | 2133 fps | 100% |
| Baschieri & Pellagri 107 | <<locked>> | 82% | 37,130 psi | 59% | 2113 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 28,660 psi | 45% | 1962 fps | 95.3% |
| Hodgdon Benchmark | <<locked>> | 80% | 40,190 psi | 64% | 2083 fps | 99.1% |
| Hodgdon BL-C2 | <<locked>> | 80% | 35,607 psi | 56% | 2096 fps | 98.4% |
| Hodgdon CFE223 | 42.5 gr | 80% | 39,247 psi | 62% | 2201 fps | 97% |
| Hodgdon H322 | <<locked>> | 80% | 43,018 psi | 68% | 2169 fps | 100% |
| Hodgdon H335 | <<locked>> | 80% | 43,511 psi | 69% | 2188 fps | 100% |
| Hodgdon H380 | <<locked>> | 88% | 38,812 psi | 62% | 2139 fps | 95.4% |
| Hodgdon H4198 | <<locked>> | 80% | 52,402 psi | 83% | 2205 fps | 100% |
| Hodgdon H4895 | <<locked>> | 80% | 36,260 psi | 57% | 2083 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 32,416 psi | 51% | 2041 fps | 95.6% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,184 psi | 51% | 2051 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,483 psi | 40% | 1214 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 34,824 psi | 55% | 2044 fps | 96.8% |
| IMR 3031 | <<locked>> | 80% | 34,969 psi | 55% | 2090 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 34,272 psi | 54% | 2021 fps | 95.5% |
| IMR 4166 Enduron | <<locked>> | 92% | 50,256 psi | 80% | 2244 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 45,339 psi | 72% | 2116 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 98% | 49,298 psi | 78% | 2264 fps | 95.3% |
| IMR 4831 | <<locked>> | 96% | 35,491 psi | 56% | 2123 fps | 95.1% |
| IMR 4895 | <<locked>> | 80% | 32,764 psi | 52% | 2041 fps | 95.7% |
| IMR 8208 XBR | <<locked>> | 80% | 38,000 psi | 60% | 2087 fps | 98.3% |
| Lovex D073.4 | <<locked>> | 80% | 51,605 psi | 82% | 2280 fps | 100% |
| Lovex D073.5 | <<locked>> | 80% | 42,076 psi | 67% | 2152 fps | 99.5% |
| Lovex D073.6 | <<locked>> | 80% | 33,852 psi | 54% | 2054 fps | 98.9% |
| Lovex S060 | <<locked>> | 80% | 36,970 psi | 59% | 2028 fps | 96.9% |
| Lovex S062 | <<locked>> | 80% | 31,749 psi | 50% | 1985 fps | 96.8% |
| Lovex S065 | <<locked>> | 96% | 42,090 psi | 67% | 2169 fps | 95.3% |
| Norma 200 | <<locked>> | 80% | 50,140 psi | 79% | 2198 fps | 100% |
| Norma 201 | <<locked>> | 80% | 35,259 psi | 56% | 2037 fps | 97.8% |
| Norma 202 | <<locked>> | 80% | 35,128 psi | 56% | 2051 fps | 99.4% |
| Norma 203B | <<locked>> | 80% | 31,459 psi | 50% | 2008 fps | 95.1% |
| Norma URP | <<locked>> | 96% | 37,246 psi | 59% | 2159 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 82% | 32,866 psi | 52% | 2051 fps | 95.2% |
| Ramshot TAC | <<locked>> | 82% | 40,364 psi | 64% | 2126 fps | 95% |
| Ramshot Wild Boar | <<locked>> | 80% | 36,550 psi | 58% | 2096 fps | 96.7% |
| Ramshot X-Terminator | <<locked>> | 80% | 41,089 psi | 65% | 2123 fps | 97.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,773 psi | 41% | 1243 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 80% | 42,467 psi | 67% | 2156 fps | 99.8% |
| ReloadSwiss RS 50 | <<locked>> | 92% | 44,976 psi | 71% | 2211 fps | 95.2% |
| ReloadSwiss RS 52 | 41.2 gr | 82% | 34,896 psi | 55% | 2129 fps | 95.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 27,470 psi | 44% | 1972 fps | 95.7% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 39,015 psi | 62% | 2221 fps | 95.6% |
| Rottweil R 901 | <<locked>> | 80% | 38,943 psi | 62% | 2080 fps | 99.7% |
| Rottweil R 902 | <<locked>> | 80% | 33,663 psi | 53% | 2001 fps | 97.3% |
| Rottweil R 903 | <<locked>> | 84% | 30,792 psi | 49% | 2005 fps | 95.8% |
| Shooters World AR Plus | <<locked>> | 80% | 51,605 psi | 82% | 2280 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 96% | 42,090 psi | 67% | 2169 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 33,852 psi | 54% | 2054 fps | 98.9% |
| Shooters World Precision | <<locked>> | 80% | 31,749 psi | 50% | 1985 fps | 96.8% |
| Shooters World Tactical Rifle | <<locked>> | 80% | 44,918 psi | 71% | 2165 fps | 99.2% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 52,112 psi | 83% | 1972 fps | 100% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 47,326 psi | 75% | 2234 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 32,126 psi | 51% | 2041 fps | 95% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 45,063 psi | 71% | 2159 fps | 100% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 40,683 psi | 64% | 2142 fps | 95.8% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,403 psi | 55% | 2044 fps | 96.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 36,985 psi | 59% | 2011 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,153 psi | 48% | 1903 fps | 99.2% |
| Somchem S321 | <<locked>> | 80% | 40,263 psi | 64% | 2149 fps | 99% |
| Somchem S335 | <<locked>> | 80% | 36,434 psi | 58% | 2018 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 35,157 psi | 56% | 2054 fps | 96.2% |
| Somchem S355 | <<locked>> | 82% | 30,095 psi | 48% | 1972 fps | 95.2% |
| Somchem S365 | <<locked>> | 90% | 27,702 psi | 44% | 1985 fps | 95.1% |
| Vihtavuori N120 | <<locked>> | 80% | 51,895 psi | 82% | 2139 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 41,959 psi | 67% | 2070 fps | 100% |
| Vihtavuori N133 | <<locked>> | 80% | 36,985 psi | 59% | 2014 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,155 psi | 51% | 1995 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 33,141 psi | 53% | 1998 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 80% | 26,629 psi | 42% | 1880 fps | 95.3% |
| Vihtavuori N160 | <<locked>> | 94% | 37,057 psi | 59% | 2123 fps | 95.1% |
| Vihtavuori N530 | <<locked>> | 80% | 37,710 psi | 60% | 2080 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 80% | 31,850 psi | 50% | 1988 fps | 98.7% |
| Vihtavuori N550 | <<locked>> | 96% | 38,348 psi | 61% | 2169 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 31,241 psi | 50% | 1978 fps | 95% |
| Winchester 748 | <<locked>> | 80% | 36,463 psi | 58% | 2113 fps | 98.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,533 psi | 53% | 2047 fps | 96.5% |
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 102 powders for .338-06 A-Square loaded with the .338 | 250gr | Norma GTX. Alliant Power Pro 2000-MR delivers the highest muzzle velocity at 2,461 fps; across all powders the maximum-charge window runs from 1,362 fps to 2,461 fps. Accurate 4064 gives the best case fill at 100 %, and 102 of the 102 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (435 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 250.0 gr projectile in 0.338" calls for a 1:12.5 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, Hodgdon CFE223, ReloadSwiss RS 52 rank at the top here: for .338-06 A-Square with the .338 | 250gr | Norma GTX 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.