Load Specifications
Load data in caliber .338 Marlin Express with .338 | 210gr | Swift Scirocco bullet and 45 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are IMR 3031, Alliant AR-Comp and Lovex D073.6.
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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2015 | <<locked>> | 92% | 41,452 psi | 89% | 2247 fps | 99.8% |
| Accurate 2460 | <<locked>> | 88% | 39,595 psi | 85% | 2241 fps | 97.8% |
| Accurate 2495ᴾ | <<locked>> | 100% | 40,698 psi | 88% | 2306 fps | 99.9% |
| Accurate 2520 | <<locked>> | 92% | 39,363 psi | 85% | 2274 fps | 97.4% |
| Accurate 4064ᴾ | <<locked>> | 100% | 37,884 psi | 82% | 2280 fps | 98.2% |
| Accurate LT-30 | <<locked>> | 82% | 39,610 psi | 85% | 2136 fps | 98.8% |
| Accurate LT-32 | <<locked>> | 82% | 40,045 psi | 86% | 2142 fps | 97.3% |
| ADI AR 2207 | <<locked>> | 82% | 41,684 psi | 90% | 2211 fps | 100% |
| ADI AR 2219 | <<locked>> | 84% | 39,320 psi | 85% | 2247 fps | 98.8% |
| Alliant AR-Comp | <<locked>> | 94% | 40,582 psi | 87% | 2306 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 86% | 39,624 psi | 85% | 2224 fps | 100% |
| Baschieri & Pellagri 106 | <<locked>> | 84% | 40,306 psi | 87% | 2172 fps | 99.2% |
| Hodgdon Benchmark | <<locked>> | 90% | 41,162 psi | 89% | 2215 fps | 96.4% |
| Hodgdon BL-C2 | <<locked>> | 94% | 40,176 psi | 87% | 2303 fps | 96.3% |
| Hodgdon H322 | <<locked>> | 88% | 40,843 psi | 88% | 2274 fps | 99% |
| Hodgdon H335 | <<locked>> | 88% | 41,553 psi | 90% | 2293 fps | 98.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,489 psi | 70% | 1401 fps | 100% |
| IMR 3031 | <<locked>> | 96% | 40,915 psi | 88% | 2333 fps | 99.6% |
| IMR 4198 | <<locked>> | 86% | 41,321 psi | 89% | 2205 fps | 100% |
| Lovex D073.4 | <<locked>> | 82% | 39,900 psi | 86% | 2244 fps | 97.2% |
| Lovex D073.5 | <<locked>> | 88% | 39,334 psi | 85% | 2234 fps | 96.4% |
| Lovex D073.6 | <<locked>> | 96% | 39,885 psi | 86% | 2297 fps | 97.5% |
| Lovex S062ᴾ | <<locked>> | 100% | 41,959 psi | 90% | 2293 fps | 96.2% |
| Norma 200 | <<locked>> | 82% | 39,610 psi | 85% | 2205 fps | 100% |
| Norma 202 | <<locked>> | 96% | 41,669 psi | 90% | 2297 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,518 psi | 70% | 1437 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 88% | 40,756 psi | 88% | 2254 fps | 97.2% |
| Rottweil R 901 | <<locked>> | 92% | 40,959 psi | 88% | 2244 fps | 98.1% |
| Shooters World AR Plus | <<locked>> | 82% | 39,900 psi | 86% | 2244 fps | 97.2% |
| Shooters World Match Rifle | <<locked>> | 96% | 39,885 psi | 86% | 2297 fps | 97.5% |
| Shooters World Precisionᴾ | <<locked>> | 100% | 41,959 psi | 90% | 2293 fps | 96.2% |
| SNPE Vectan SP 10 | <<locked>> | 84% | 39,871 psi | 86% | 2254 fps | 98% |
| SNPE Vectan SP 3 | <<locked>> | 86% | 40,437 psi | 87% | 2231 fps | 99.4% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 40,001 psi | 86% | 2178 fps | 97.9% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 41,046 psi | 88% | 2215 fps | 98.9% |
| Somchem S321 | <<locked>> | 90% | 40,553 psi | 87% | 2274 fps | 96% |
| Somchem S335 | <<locked>> | 94% | 41,234 psi | 89% | 2224 fps | 98.9% |
| Vihtavuori N120 | <<locked>> | 82% | 41,829 psi | 90% | 2175 fps | 100% |
| Vihtavuori N130 | <<locked>> | 88% | 40,451 psi | 87% | 2188 fps | 100% |
| Vihtavuori N133 | <<locked>> | 94% | 41,930 psi | 90% | 2224 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 98% | 39,639 psi | 85% | 2270 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 96% | 39,769 psi | 86% | 2241 fps | 98.3% |
| Vihtavuori N530 | <<locked>> | 92% | 40,567 psi | 87% | 2244 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 98% | 40,524 psi | 87% | 2274 fps | 98% |
| Winchester 748 | <<locked>> | 94% | 41,597 psi | 90% | 2323 fps | 96.9% |
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% | 28,529 psi | 61% | 2005 fps | 97.6% |
| Accurate 2460 | <<locked>> | 80% | 30,327 psi | 65% | 2060 fps | 95% |
| Accurate 2495 | <<locked>> | 82% | 22,524 psi | 49% | 1929 fps | 95.6% |
| Accurate 2520 | <<locked>> | 86% | 32,053 psi | 69% | 2139 fps | 95.2% |
| Accurate 4064 | <<locked>> | 90% | 27,717 psi | 60% | 2070 fps | 95% |
| Accurate LT-30 | <<locked>> | 80% | 37,304 psi | 80% | 2093 fps | 98.4% |
| Accurate LT-32 | <<locked>> | 80% | 37,695 psi | 81% | 2100 fps | 96.7% |
| ADI AR 2207 | <<locked>> | 80% | 39,421 psi | 85% | 2178 fps | 100% |
| ADI AR 2219 | <<locked>> | 80% | 34,519 psi | 74% | 2159 fps | 97.7% |
| Alliant AR-Comp | 32.2 gr | 80% | 26,295 psi | 57% | 2018 fps | 99% |
| Alliant Reloder-10x | <<locked>> | 80% | 33,112 psi | 71% | 2106 fps | 99.5% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 35,462 psi | 76% | 2090 fps | 98.3% |
| Hodgdon Benchmark | <<locked>> | 86% | 36,680 psi | 79% | 2133 fps | 95.1% |
| Hodgdon BL-C2 | <<locked>> | 92% | 37,492 psi | 81% | 2257 fps | 95.6% |
| Hodgdon H322 | <<locked>> | 80% | 31,705 psi | 68% | 2100 fps | 96.8% |
| Hodgdon H335 | <<locked>> | 80% | 31,792 psi | 69% | 2106 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,975 psi | 52% | 1250 fps | 100% |
| IMR 3031 | 32.9 gr | 82% | 26,629 psi | 57% | 2031 fps | 95.7% |
| IMR 4198 | <<locked>> | 80% | 34,853 psi | 75% | 2096 fps | 99.9% |
| Lovex D073.4 | <<locked>> | 80% | 37,159 psi | 80% | 2195 fps | 96.5% |
| Lovex D073.5 | <<locked>> | 86% | 36,724 psi | 79% | 2188 fps | 95.7% |
| Lovex D073.6 | 38.5 gr | 90% | 32,503 psi | 70% | 2159 fps | 95.3% |
| Lovex S062 | <<locked>> | 98% | 39,523 psi | 85% | 2251 fps | 95.5% |
| Norma 200 | <<locked>> | 80% | 37,217 psi | 80% | 2165 fps | 100% |
| Norma 202 | <<locked>> | 86% | 30,705 psi | 66% | 2090 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,859 psi | 51% | 1280 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 33,518 psi | 72% | 2116 fps | 95.1% |
| Rottweil R 901 | <<locked>> | 82% | 30,705 psi | 66% | 2047 fps | 95.1% |
| Shooters World AR Plus | <<locked>> | 80% | 37,159 psi | 80% | 2195 fps | 96.5% |
| Shooters World Match Rifle | <<locked>> | 90% | 32,503 psi | 70% | 2159 fps | 95.3% |
| Shooters World Precision | <<locked>> | 98% | 39,523 psi | 85% | 2251 fps | 95.5% |
| SNPE Vectan SP 10 | <<locked>> | 80% | 34,853 psi | 75% | 2162 fps | 96.7% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 33,446 psi | 72% | 2103 fps | 98.2% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 31,502 psi | 68% | 2021 fps | 95.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 28,718 psi | 62% | 1982 fps | 95.6% |
| Somchem S321 | <<locked>> | 88% | 37,927 psi | 82% | 2228 fps | 95.3% |
| Somchem S335 | <<locked>> | 82% | 28,732 psi | 62% | 1985 fps | 95.5% |
| Vihtavuori N120 | <<locked>> | 80% | 39,581 psi | 85% | 2142 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 31,676 psi | 68% | 2031 fps | 99% |
| Vihtavuori N133 | <<locked>> | 80% | 27,543 psi | 59% | 1952 fps | 96.9% |
| Vihtavuori N135 | <<locked>> | 80% | 22,858 psi | 49% | 1903 fps | 95.1% |
| Vihtavuori N140 | <<locked>> | 86% | 29,080 psi | 63% | 2031 fps | 95% |
| Vihtavuori N530 | <<locked>> | 90% | 38,174 psi | 82% | 2201 fps | 95% |
| Vihtavuori N540 | <<locked>> | 90% | 31,589 psi | 68% | 2103 fps | 95.4% |
| Winchester 748 | <<locked>> | 90% | 36,463 psi | 79% | 2228 fps | 95.4% |
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 45 powders for .338 Marlin Express loaded with the .338 | 210gr | Swift Scirocco. IMR 3031 delivers the highest muzzle velocity at 2,333 fps; across all powders the maximum-charge window runs from 1,401 fps to 2,333 fps. Accurate 2495 gives the best case fill at 100 %, and 45 of the 45 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (320 MPa), the top charges use 70–90 %, leaving at least 10 % headroom. The 210.0 gr projectile in 0.338" calls for a 1:13.5 twist; slower twists will usually not stabilise this weight. Accurate 2495, Accurate 4064, Hodgdon TrailBoss 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. IMR 3031, Alliant AR-Comp, Lovex D073.6 rank at the top here: for .338 Marlin Express with the .338 | 210gr | Swift Scirocco 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.