Load Specifications
Bullet:.338 | 307gr | Hornady Sub-X
Bullet Manufacturer:Hornady
Bullet Weight:307 gr
Bullet Diameter:0.338"
Bullet Length:<<locked>>
Caliber:.338 Win Mag. load data
Case Length (l3):2.5"
Cartridge Length (C.O.L.):<<locked>>
Case Capacity:86 Grains of Water
Primer Size:Large Rifle (LR)
Barrel Length:24"
Max. allowed Pressure:62,366 psi
Recommended Twist Rate:1:12.0
Load data in caliber .338 Win Mag. with .338 | 307gr | Hornady Sub-X 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 Reloder-26, Accurate High Country and ReloadSwiss RS 70.
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 2495 | <<locked>> | 82% | 54,810 psi | 88% | 2165 fps | 100% |
| Accurate 2700 | <<locked>> | 84% | 55,680 psi | 89% | 2234 fps | 99.7% |
| Accurate 3100ᴾ | <<locked>> | 100% | 52,605 psi | 84% | 2280 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 54,998 psi | 88% | 2211 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 55,303 psi | 89% | 2313 fps | 100% |
| Accurate High Country | <<locked>> | 98% | 53,780 psi | 86% | 2408 fps | 98.9% |
| Accurate MAGPROᴾ | <<locked>> | 100% | 54,578 psi | 88% | 2408 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 86% | 54,926 psi | 88% | 2241 fps | 100% |
| ADI AR 2209 | <<locked>> | 98% | 56,072 psi | 90% | 2359 fps | 99.5% |
| ADI AR 2213ᴾ | <<locked>> | 100% | 53,519 psi | 86% | 2356 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 34,432 psi | 55% | 2096 fps | 96.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 54,070 psi | 87% | 2346 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 98% | 56,231 psi | 90% | 2356 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 55,898 psi | 90% | 2264 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 84% | 56,130 psi | 90% | 2280 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 94% | 56,014 psi | 90% | 2356 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 88% | 53,592 psi | 86% | 2333 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 98% | 55,434 psi | 89% | 2349 fps | 99.5% |
| Alliant Reloder-22ᴾ | <<locked>> | 100% | 52,286 psi | 84% | 2356 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 49,661 psi | 80% | 2293 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 43,192 psi | 69% | 2247 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 98% | 52,692 psi | 84% | 2411 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 48,211 psi | 77% | 2297 fps | 98.7% |
| Bofors RP3 | <<locked>> | 84% | 53,185 psi | 85% | 2238 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 39,015 psi | 63% | 2185 fps | 96.1% |
| Bofors RP5ᴾ | <<locked>> | 100% | 52,286 psi | 84% | 2356 fps | 99.3% |
| Bofors RP7 | <<locked>> | 90% | 56,014 psi | 90% | 2274 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 43,062 psi | 69% | 2198 fps | 97% |
| Hodgdon H380 | <<locked>> | 84% | 53,592 psi | 86% | 2254 fps | 100% |
| Hodgdon H414 | <<locked>> | 90% | 53,824 psi | 86% | 2316 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 88% | 54,041 psi | 87% | 2283 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 98% | 53,969 psi | 87% | 2313 fps | 97.9% |
| Hodgdon H4831 SCᴾ | <<locked>> | 100% | 56,188 psi | 90% | 2339 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 56,434 psi | 90% | 2290 fps | 100% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 54,563 psi | 87% | 2277 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 42,322 psi | 68% | 2283 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 90% | 53,621 psi | 86% | 2352 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,492 psi | 59% | 1358 fps | 100% |
| Hodgdon VARGET | <<locked>> | 82% | 55,463 psi | 89% | 2241 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 54,607 psi | 88% | 2228 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 82% | 53,693 psi | 86% | 2221 fps | 99.8% |
| IMR 4350 | <<locked>> | 92% | 53,330 psi | 86% | 2260 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 88% | 54,288 psi | 87% | 2254 fps | 99.9% |
| IMR 4831 | <<locked>> | 94% | 55,709 psi | 89% | 2306 fps | 100% |
| IMR 4895 | <<locked>> | 82% | 54,056 psi | 87% | 2260 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 98% | 55,550 psi | 89% | 2300 fps | 98.3% |
| IMR 7828 SSCᴾ | <<locked>> | 100% | 51,053 psi | 82% | 2336 fps | 98.2% |
| Lovex S060 | <<locked>> | 82% | 56,260 psi | 90% | 2211 fps | 100% |
| Lovex S062 | <<locked>> | 84% | 54,752 psi | 88% | 2221 fps | 100% |
| Lovex S065 | <<locked>> | 90% | 54,273 psi | 87% | 2251 fps | 100% |
| Lovex S070 | <<locked>> | 92% | 55,463 psi | 89% | 2287 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 44,106 psi | 71% | 2169 fps | 99.6% |
| Norma 201 | <<locked>> | 82% | 56,275 psi | 90% | 2228 fps | 100% |
| Norma 203B | <<locked>> | 84% | 55,405 psi | 89% | 2270 fps | 100% |
| Norma 204 | <<locked>> | 92% | 53,679 psi | 86% | 2306 fps | 99.2% |
| Norma MRPᴾ | <<locked>> | 100% | 55,434 psi | 89% | 2421 fps | 100% |
| Norma URP | <<locked>> | 92% | 54,128 psi | 87% | 2303 fps | 100% |
| Ramshot Big Game | <<locked>> | 84% | 55,985 psi | 90% | 2293 fps | 100% |
| Ramshot Grandᴾ | <<locked>> | 100% | 51,372 psi | 82% | 2349 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 94% | 56,318 psi | 90% | 2352 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 45,527 psi | 73% | 2251 fps | 98.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,144 psi | 60% | 1391 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 84% | 53,505 psi | 86% | 2244 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 53,287 psi | 85% | 2326 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 54,882 psi | 88% | 2336 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 53,548 psi | 86% | 2362 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 41,829 psi | 67% | 2274 fps | 99.1% |
| Rottweil R 902 | <<locked>> | 82% | 53,476 psi | 86% | 2188 fps | 100% |
| Rottweil R 903 | <<locked>> | 86% | 53,301 psi | 85% | 2234 fps | 100% |
| Rottweil R 904 | <<locked>> | 96% | 54,418 psi | 87% | 2287 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 98% | 54,665 psi | 88% | 2336 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 90% | 56,014 psi | 90% | 2274 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 90% | 54,273 psi | 87% | 2251 fps | 100% |
| Shooters World Precision | <<locked>> | 84% | 54,752 psi | 88% | 2221 fps | 100% |
| Shooters World SW4350 | <<locked>> | 92% | 55,463 psi | 89% | 2287 fps | 100% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 54,679 psi | 88% | 2287 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 82% | 55,738 psi | 89% | 2257 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 54,491 psi | 87% | 2133 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 90% | 53,925 psi | 86% | 2215 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 98% | 54,186 psi | 87% | 2336 fps | 99.4% |
| Somchem S355 | <<locked>> | 86% | 53,388 psi | 86% | 2231 fps | 100% |
| Somchem S361 | <<locked>> | 96% | 55,941 psi | 90% | 2287 fps | 98.1% |
| Somchem S365 | <<locked>> | 94% | 53,272 psi | 85% | 2303 fps | 100% |
| Somchem S385 | <<locked>> | 98% | 55,085 psi | 88% | 2313 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 82% | 53,766 psi | 86% | 2149 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 53,882 psi | 86% | 2165 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 54,288 psi | 87% | 2208 fps | 100% |
| Vihtavuori N160 | <<locked>> | 92% | 56,202 psi | 90% | 2293 fps | 100% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 50,792 psi | 81% | 2251 fps | 99.3% |
| Vihtavuori N540 | <<locked>> | 84% | 55,506 psi | 89% | 2208 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 55,201 psi | 89% | 2303 fps | 100% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 55,564 psi | 89% | 2352 fps | 100% |
| Vihtavuori N560ᴾ | <<locked>> | 100% | 55,825 psi | 90% | 2418 fps | 98.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 44,396 psi | 71% | 2254 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 55,564 psi | 89% | 2267 fps | 100% |
| Winchester 760 | <<locked>> | 90% | 54,085 psi | 87% | 2320 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 44,512 psi | 71% | 2349 fps | 100% |
| Winchester StaBALL Match | <<locked>> | 82% | 55,970 psi | 90% | 2264 fps | 100% |
| Winchester Supreme 780ᴾ | <<locked>> | 100% | 55,201 psi | 89% | 2313 fps | 99.3% |
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 2495 | <<locked>> | 80% | 51,343 psi | 82% | 2129 fps | 100% |
| Accurate 2700 | <<locked>> | 80% | 48,907 psi | 78% | 2149 fps | 99.1% |
| Accurate 3100 | <<locked>> | 80% | 27,108 psi | 43% | 1857 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 48,689 psi | 78% | 2139 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 36,999 psi | 59% | 2057 fps | 99.6% |
| Accurate High Country | 58.9 gr | 88% | 38,232 psi | 61% | 2165 fps | 95.5% |
| Accurate MAGPRO | <<locked>> | 94% | 44,382 psi | 71% | 2260 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 45,919 psi | 74% | 2126 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 35,998 psi | 58% | 2047 fps | 95.5% |
| ADI AR 2213 | <<locked>> | 92% | 41,466 psi | 66% | 2172 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 98% | 32,401 psi | 52% | 2047 fps | 95.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 50,604 psi | 81% | 2303 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 84% | 36,085 psi | 58% | 2047 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 46,456 psi | 74% | 2146 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 49,487 psi | 79% | 2198 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 36,245 psi | 58% | 2067 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 40,712 psi | 65% | 2159 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 35,723 psi | 57% | 2044 fps | 95.6% |
| Alliant Reloder-22 | <<locked>> | 88% | 35,621 psi | 57% | 2087 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 26,513 psi | 43% | 1886 fps | 98.5% |
| Alliant Reloder-25 | <<locked>> | 84% | 26,484 psi | 42% | 1893 fps | 95% |
| Alliant Reloder-26 | 55.2 gr | 80% | 28,079 psi | 45% | 1978 fps | 97.1% |
| Bofors RP15 | <<locked>> | 90% | 35,157 psi | 56% | 2077 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 46,688 psi | 75% | 2156 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 36,782 psi | 59% | 2142 fps | 95.3% |
| Bofors RP5 | <<locked>> | 88% | 35,621 psi | 57% | 2087 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 41,234 psi | 66% | 2067 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 96% | 37,768 psi | 61% | 2103 fps | 95.2% |
| Hodgdon H380 | <<locked>> | 80% | 46,920 psi | 75% | 2169 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 39,030 psi | 63% | 2096 fps | 98.2% |
| Hodgdon H4350 | <<locked>> | 80% | 41,959 psi | 67% | 2110 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 90% | 41,350 psi | 66% | 2129 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 43,453 psi | 70% | 2162 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 33,663 psi | 54% | 1978 fps | 99.8% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 51,155 psi | 82% | 2234 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 35,041 psi | 56% | 2133 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 37,695 psi | 60% | 2110 fps | 97.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 44% | 1211 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 52,315 psi | 84% | 2205 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 48,312 psi | 77% | 2149 fps | 100% |
| IMR 4166 Enduron | <<locked>> | 80% | 50,459 psi | 81% | 2178 fps | 99.6% |
| IMR 4350 | <<locked>> | 80% | 36,767 psi | 59% | 2011 fps | 97% |
| IMR 4451 Enduron | <<locked>> | 80% | 42,540 psi | 68% | 2087 fps | 98.7% |
| IMR 4831 | <<locked>> | 80% | 35,679 psi | 57% | 2021 fps | 99.4% |
| IMR 4895 | <<locked>> | 80% | 50,778 psi | 81% | 2221 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 40,828 psi | 65% | 2087 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 92% | 39,552 psi | 63% | 2149 fps | 95.3% |
| Lovex S060 | <<locked>> | 80% | 52,881 psi | 85% | 2172 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 48,501 psi | 78% | 2146 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 40,118 psi | 64% | 2051 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 38,406 psi | 62% | 2041 fps | 98.1% |
| Lovex S071 | <<locked>> | 84% | 26,716 psi | 43% | 1847 fps | 95% |
| Norma 201 | <<locked>> | 80% | 52,823 psi | 85% | 2188 fps | 100% |
| Norma 203B | <<locked>> | 80% | 48,849 psi | 78% | 2188 fps | 100% |
| Norma 204 | <<locked>> | 80% | 36,129 psi | 58% | 2034 fps | 95.5% |
| Norma MRP | <<locked>> | 82% | 30,429 psi | 49% | 2001 fps | 95.2% |
| Norma URP | <<locked>> | 80% | 36,956 psi | 59% | 2054 fps | 99.5% |
| Ramshot Big Game | <<locked>> | 80% | 49,124 psi | 79% | 2211 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 39,015 psi | 63% | 2152 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 35,665 psi | 57% | 2047 fps | 98.1% |
| Ramshot Magnum | <<locked>> | 92% | 34,505 psi | 55% | 2057 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,789 psi | 45% | 1240 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 47,050 psi | 75% | 2159 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 43,279 psi | 69% | 2195 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 36,695 psi | 59% | 2077 fps | 99.4% |
| ReloadSwiss RS 70 | 54.7 gr | 80% | 35,679 psi | 57% | 2087 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 31,981 psi | 51% | 2067 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 50,473 psi | 81% | 2152 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 44,048 psi | 71% | 2116 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 39,856 psi | 64% | 2073 fps | 95.5% |
| Rottweil R 905 | <<locked>> | 84% | 34,693 psi | 56% | 2031 fps | 95.5% |
| Rottweil R 907 | <<locked>> | 80% | 41,234 psi | 66% | 2067 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 40,118 psi | 64% | 2051 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 48,501 psi | 78% | 2146 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 38,406 psi | 62% | 2041 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 44,991 psi | 72% | 2162 fps | 100% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 52,373 psi | 84% | 2218 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 45,295 psi | 73% | 2028 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 39,175 psi | 63% | 2005 fps | 98.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 34,374 psi | 55% | 2024 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 44,309 psi | 71% | 2113 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 43,091 psi | 69% | 2110 fps | 95.5% |
| Somchem S365 | <<locked>> | 80% | 33,272 psi | 53% | 2021 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 31,024 psi | 50% | 1932 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 50,604 psi | 81% | 2116 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 50,850 psi | 82% | 2133 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 42,366 psi | 68% | 2057 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 38,218 psi | 61% | 2047 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 32,532 psi | 52% | 1959 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 48,820 psi | 78% | 2133 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 37,579 psi | 60% | 2054 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 29,109 psi | 47% | 1942 fps | 98.4% |
| Vihtavuori N560 | <<locked>> | 90% | 40,103 psi | 64% | 2178 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 96% | 38,885 psi | 62% | 2162 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 37,202 psi | 60% | 2024 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 39,030 psi | 63% | 2096 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 23,380 psi | 37% | 1877 fps | 98% |
| Winchester StaBALL Match | <<locked>> | 80% | 52,315 psi | 84% | 2221 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 34,418 psi | 55% | 2001 fps | 95% |
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 Win Mag. loaded with the .338 | 307gr | Hornady Sub-X. Norma MRP delivers the highest muzzle velocity at 2,421 fps; across all powders the maximum-charge window runs from 1,358 fps to 2,421 fps. Accurate 3100 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 (430 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 307.0 gr projectile in 0.338" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Accurate MAGPRO, ADI AR 2213 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 Reloder-26, Accurate High Country, ReloadSwiss RS 70 rank at the top here: for .338 Win Mag. with the .338 | 307gr | Hornady Sub-X 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.