Load Specifications
Load data in caliber .338 Marlin Express with .338 | 250gr | A-Square LionLoad bullet and 65 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 60, Alliant Reloder-17 and Ramshot Big Game.
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 2495 | <<locked>> | 88% | 41,379 psi | 89% | 2162 fps | 100% |
| Accurate 2520 | <<locked>> | 82% | 40,582 psi | 87% | 2169 fps | 99.8% |
| Accurate 4064 | <<locked>> | 90% | 41,524 psi | 89% | 2195 fps | 100% |
| Accurate 4350 | <<locked>> | 98% | 39,276 psi | 85% | 2221 fps | 96.5% |
| ADI AR 2206H | <<locked>> | 84% | 41,075 psi | 89% | 2172 fps | 98% |
| ADI AR 2208 | <<locked>> | 88% | 39,508 psi | 85% | 2129 fps | 96.9% |
| ADI Benchmark 8208 | <<locked>> | 82% | 40,625 psi | 88% | 2139 fps | 98.9% |
| Alliant AR-Comp | <<locked>> | 82% | 39,407 psi | 85% | 2139 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 86% | 39,813 psi | 86% | 2238 fps | 96.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 90% | 40,785 psi | 88% | 2188 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 88% | 41,611 psi | 90% | 2201 fps | 97.7% |
| Alliant Reloder-16 | <<locked>> | 98% | 40,480 psi | 87% | 2228 fps | 96.6% |
| Alliant Reloder-17 | <<locked>> | 94% | 40,538 psi | 87% | 2260 fps | 98.3% |
| Baschieri & Pellagri 107 | <<locked>> | 84% | 40,089 psi | 86% | 2175 fps | 96.7% |
| Bofors RP3 | <<locked>> | 90% | 40,147 psi | 87% | 2192 fps | 98.8% |
| Hodgdon BL-C2 | <<locked>> | 84% | 41,191 psi | 89% | 2201 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 90% | 41,771 psi | 90% | 2198 fps | 96.4% |
| Hodgdon H4895 | <<locked>> | 84% | 41,336 psi | 89% | 2182 fps | 98.6% |
| Hodgdon Hybrid 100Vᴾ | <<locked>> | 100% | 39,291 psi | 85% | 2182 fps | 98% |
| Hodgdon LEVERevolution | <<locked>> | 86% | 39,494 psi | 85% | 2198 fps | 98.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 34,548 psi | 74% | 1368 fps | 100% |
| Hodgdon VARGET | <<locked>> | 84% | 39,987 psi | 86% | 2146 fps | 98.2% |
| IMR 3031 | <<locked>> | 84% | 40,132 psi | 86% | 2182 fps | 100% |
| IMR 4064 | <<locked>> | 88% | 41,495 psi | 89% | 2156 fps | 97.7% |
| IMR 4831ᴾ | <<locked>> | 100% | 40,727 psi | 88% | 2224 fps | 96.9% |
| IMR 4895 | <<locked>> | 86% | 39,958 psi | 86% | 2185 fps | 97.9% |
| IMR 8208 XBR | <<locked>> | 82% | 40,625 psi | 88% | 2139 fps | 98.9% |
| Lovex D073.6 | <<locked>> | 86% | 41,989 psi | 90% | 2198 fps | 99.9% |
| Lovex S060 | <<locked>> | 82% | 39,494 psi | 85% | 2083 fps | 97.6% |
| Lovex S062 | <<locked>> | 88% | 40,988 psi | 88% | 2162 fps | 99% |
| Norma 201 | <<locked>> | 84% | 40,277 psi | 87% | 2136 fps | 98.9% |
| Norma 202 | <<locked>> | 84% | 40,190 psi | 87% | 2146 fps | 99.9% |
| Norma 203B | <<locked>> | 88% | 40,857 psi | 88% | 2192 fps | 98.1% |
| Norma URP | <<locked>> | 98% | 40,248 psi | 87% | 2224 fps | 96.5% |
| Ramshot Big Game | <<locked>> | 88% | 40,408 psi | 87% | 2205 fps | 97.7% |
| Ramshot Wild Boar | <<locked>> | 82% | 39,552 psi | 85% | 2156 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,766 psi | 75% | 1401 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 86% | 40,466 psi | 87% | 2241 fps | 97.5% |
| ReloadSwiss RS 60 | <<locked>> | 92% | 40,683 psi | 88% | 2274 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 98% | 39,479 psi | 85% | 2238 fps | 96% |
| Rottweil R 901 | <<locked>> | 82% | 41,669 psi | 90% | 2133 fps | 99.9% |
| Rottweil R 902 | <<locked>> | 86% | 40,770 psi | 88% | 2136 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 92% | 40,321 psi | 87% | 2188 fps | 98.5% |
| Shooters World Match Rifle | <<locked>> | 86% | 41,989 psi | 90% | 2198 fps | 99.9% |
| Shooters World Precision | <<locked>> | 88% | 40,988 psi | 88% | 2162 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 92% | 41,843 psi | 90% | 2234 fps | 98.1% |
| SNPE Vectan SP 7 | <<locked>> | 84% | 41,046 psi | 88% | 2159 fps | 96% |
| SNPE Vectan SP 9 | <<locked>> | 84% | 39,653 psi | 85% | 2149 fps | 97.7% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 39,668 psi | 85% | 2064 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 90% | 41,684 psi | 90% | 2106 fps | 100% |
| Somchem S335 | <<locked>> | 84% | 41,466 psi | 89% | 2106 fps | 100% |
| Somchem S341 | <<locked>> | 84% | 40,814 psi | 88% | 2162 fps | 97.8% |
| Somchem S355 | <<locked>> | 92% | 41,510 psi | 89% | 2195 fps | 98.6% |
| Somchem S365ᴾ | <<locked>> | 100% | 37,942 psi | 82% | 2221 fps | 99% |
| Vihtavuori N133 | <<locked>> | 82% | 39,711 psi | 86% | 2064 fps | 100% |
| Vihtavuori N135 | <<locked>> | 88% | 41,916 psi | 90% | 2159 fps | 100% |
| Vihtavuori N140 | <<locked>> | 86% | 40,466 psi | 87% | 2133 fps | 100% |
| Vihtavuori N150 | <<locked>> | 92% | 39,682 psi | 86% | 2142 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 96% | 39,769 psi | 86% | 2178 fps | 96.1% |
| Vihtavuori N530 | <<locked>> | 82% | 40,712 psi | 88% | 2139 fps | 99% |
| Vihtavuori N540 | <<locked>> | 88% | 41,481 psi | 89% | 2165 fps | 100% |
| Vihtavuori N550 | <<locked>> | 98% | 41,133 psi | 89% | 2224 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 96% | 40,756 psi | 88% | 2172 fps | 98.3% |
| Winchester 748 | <<locked>> | 84% | 41,901 psi | 90% | 2215 fps | 99.6% |
| Winchester StaBALL Match | <<locked>> | 86% | 41,249 psi | 89% | 2195 fps | 98.6% |
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% | 32,039 psi | 69% | 2011 fps | 100% |
| Accurate 2520 | <<locked>> | 80% | 38,043 psi | 82% | 2126 fps | 99.6% |
| Accurate 4064 | <<locked>> | 80% | 30,313 psi | 65% | 1995 fps | 99% |
| Accurate 4350 | <<locked>> | 96% | 36,593 psi | 79% | 2175 fps | 95.7% |
| ADI AR 2206H | <<locked>> | 80% | 36,187 psi | 78% | 2083 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 84% | 35,027 psi | 75% | 2047 fps | 95.6% |
| ADI Benchmark 8208 | <<locked>> | 80% | 38,130 psi | 82% | 2096 fps | 98.4% |
| Alliant AR-Comp | <<locked>> | 80% | 37,028 psi | 80% | 2103 fps | 100% |
| Alliant Power Pro 2000-MR | <<locked>> | 84% | 37,144 psi | 80% | 2182 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 29,747 psi | 64% | 1978 fps | 95.7% |
| Alliant Reloder-15 | <<locked>> | 82% | 34,360 psi | 74% | 2070 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 94% | 35,998 psi | 78% | 2142 fps | 95% |
| Alliant Reloder-17 | 44.4 gr | 86% | 31,473 psi | 68% | 2073 fps | 95.2% |
| Baschieri & Pellagri 107 | <<locked>> | 80% | 34,954 psi | 75% | 2080 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 29,022 psi | 63% | 1978 fps | 95.6% |
| Hodgdon BL-C2 | <<locked>> | 80% | 35,969 psi | 78% | 2110 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 88% | 39,131 psi | 84% | 2152 fps | 95.7% |
| Hodgdon H4895 | <<locked>> | 80% | 36,376 psi | 78% | 2093 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 30,879 psi | 67% | 2014 fps | 95.1% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 32,518 psi | 70% | 2064 fps | 96.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,701 psi | 55% | 1220 fps | 100% |
| Hodgdon VARGET | <<locked>> | 80% | 35,201 psi | 76% | 2057 fps | 97% |
| IMR 3031 | <<locked>> | 80% | 35,172 psi | 76% | 2100 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 32,460 psi | 70% | 1991 fps | 95% |
| IMR 4831 | <<locked>> | 96% | 35,781 psi | 77% | 2139 fps | 95.4% |
| IMR 4895 | <<locked>> | 80% | 32,909 psi | 71% | 2051 fps | 95.9% |
| IMR 8208 XBR | <<locked>> | 80% | 38,130 psi | 82% | 2096 fps | 98.4% |
| Lovex D073.6 | <<locked>> | 80% | 34,214 psi | 74% | 2067 fps | 99% |
| Lovex S060 | <<locked>> | 80% | 37,362 psi | 81% | 2044 fps | 97.1% |
| Lovex S062 | <<locked>> | 80% | 32,111 psi | 69% | 1998 fps | 97% |
| Norma 201 | <<locked>> | 80% | 35,650 psi | 77% | 2054 fps | 98% |
| Norma 202 | <<locked>> | 80% | 35,549 psi | 77% | 2064 fps | 99.6% |
| Norma 203B | <<locked>> | 80% | 31,604 psi | 68% | 2018 fps | 95.3% |
| Norma URP | <<locked>> | 96% | 37,768 psi | 81% | 2178 fps | 95.7% |
| Ramshot Big Game | 43 gr | 82% | 33,344 psi | 72% | 2070 fps | 95.5% |
| Ramshot Wild Boar | <<locked>> | 80% | 36,898 psi | 80% | 2110 fps | 97% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,759 psi | 56% | 1250 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 33,025 psi | 71% | 2096 fps | 95.1% |
| ReloadSwiss RS 60 | 41.3 gr | 80% | 27,731 psi | 60% | 1988 fps | 96.1% |
| ReloadSwiss RS 62 | <<locked>> | 96% | 37,072 psi | 80% | 2192 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 80% | 39,378 psi | 85% | 2096 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 80% | 33,852 psi | 73% | 2011 fps | 97.5% |
| Rottweil R 903 | <<locked>> | 82% | 29,138 psi | 63% | 1975 fps | 95.3% |
| Shooters World Match Rifle | <<locked>> | 80% | 34,214 psi | 74% | 2067 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 32,111 psi | 69% | 1998 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 32,605 psi | 70% | 2060 fps | 95.4% |
| SNPE Vectan SP 7 | <<locked>> | 82% | 38,508 psi | 83% | 2113 fps | 95.3% |
| SNPE Vectan SP 9 | <<locked>> | 80% | 34,766 psi | 75% | 2060 fps | 96.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 37,376 psi | 81% | 2024 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,545 psi | 66% | 1916 fps | 99.3% |
| Somchem S335 | <<locked>> | 80% | 36,811 psi | 79% | 2031 fps | 99.9% |
| Somchem S341 | <<locked>> | 80% | 35,534 psi | 77% | 2070 fps | 96.5% |
| Somchem S355 | <<locked>> | 82% | 30,255 psi | 65% | 1982 fps | 95.4% |
| Somchem S365 | <<locked>> | 90% | 27,934 psi | 60% | 2001 fps | 95.4% |
| Vihtavuori N133 | <<locked>> | 80% | 37,391 psi | 81% | 2028 fps | 100% |
| Vihtavuori N135 | <<locked>> | 80% | 32,605 psi | 70% | 2008 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 33,562 psi | 72% | 2014 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 80% | 26,963 psi | 58% | 1893 fps | 95.6% |
| Vihtavuori N160 | <<locked>> | 94% | 37,304 psi | 80% | 2136 fps | 95.4% |
| Vihtavuori N530 | <<locked>> | 80% | 38,130 psi | 82% | 2096 fps | 98.5% |
| Vihtavuori N540 | <<locked>> | 80% | 32,213 psi | 69% | 2005 fps | 98.9% |
| Vihtavuori N550 | <<locked>> | 96% | 38,624 psi | 83% | 2182 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 31,633 psi | 68% | 1998 fps | 95.3% |
| Winchester 748 | <<locked>> | 80% | 36,840 psi | 79% | 2129 fps | 99% |
| Winchester StaBALL Match | <<locked>> | 80% | 33,866 psi | 73% | 2060 fps | 96.8% |
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 65 powders for .338 Marlin Express loaded with the .338 | 250gr | A-Square LionLoad. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,274 fps; across all powders the maximum-charge window runs from 1,368 fps to 2,274 fps. Hodgdon Hybrid 100V gives the best case fill at 100 %, and 65 of the 65 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (320 MPa), the top charges use 74–90 %, leaving at least 10 % headroom. Hodgdon Hybrid 100V, Hodgdon TrailBoss, IMR 4831 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. ReloadSwiss RS 60, Alliant Reloder-17, Ramshot Big Game rank at the top here: for .338 Marlin Express with the .338 | 250gr | A-Square LionLoad 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.