Load Specifications
Load data in caliber .33 Win. with .338 | 180gr | Impala LW CFN bullet and 27 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, Accurate 4064 and IMR 3031.
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>> | 86% | 38,711 psi | 88% | 2392 fps | 99% |
| Accurate 2460 | <<locked>> | 84% | 39,117 psi | 88% | 2418 fps | 96.6% |
| Accurate 2495 | <<locked>> | 94% | 39,320 psi | 89% | 2470 fps | 99.4% |
| Accurate 2520 | <<locked>> | 88% | 38,696 psi | 87% | 2454 fps | 96% |
| Accurate 4064 | <<locked>> | 96% | 38,827 psi | 88% | 2480 fps | 97.4% |
| Alliant AR-Comp | <<locked>> | 90% | 39,436 psi | 89% | 2493 fps | 100% |
| Alliant Reloder-10x | <<locked>> | 82% | 39,088 psi | 88% | 2408 fps | 99.7% |
| Hodgdon H322 | <<locked>> | 84% | 39,291 psi | 89% | 2444 fps | 97.9% |
| Hodgdon H335 | <<locked>> | 84% | 39,900 psi | 90% | 2461 fps | 97% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,504 psi | 76% | 1572 fps | 100% |
| IMR 3031 | <<locked>> | 90% | 37,869 psi | 86% | 2474 fps | 98.4% |
| IMR 4198 | <<locked>> | 82% | 39,842 psi | 90% | 2385 fps | 100% |
| Lovex D073.6 | <<locked>> | 92% | 39,160 psi | 89% | 2477 fps | 96.2% |
| Norma 202 | <<locked>> | 90% | 38,464 psi | 87% | 2434 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,634 psi | 76% | 1608 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 84% | 39,204 psi | 89% | 2418 fps | 95.7% |
| Rottweil R 901 | <<locked>> | 86% | 39,349 psi | 89% | 2398 fps | 96.6% |
| Shooters World Match Rifle | <<locked>> | 92% | 39,160 psi | 89% | 2477 fps | 96.2% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 39,073 psi | 88% | 2405 fps | 98.6% |
| SNPE Vectan Tubal 3000 | <<locked>> | 88% | 39,117 psi | 88% | 2352 fps | 96.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 39,566 psi | 89% | 2385 fps | 97.9% |
| Somchem S335 | <<locked>> | 88% | 38,508 psi | 87% | 2365 fps | 97.5% |
| Vihtavuori N130 | <<locked>> | 84% | 39,291 psi | 89% | 2362 fps | 99.6% |
| Vihtavuori N133 | <<locked>> | 88% | 38,464 psi | 87% | 2362 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 94% | 39,044 psi | 88% | 2461 fps | 99.3% |
| Vihtavuori N140 | <<locked>> | 92% | 38,537 psi | 87% | 2411 fps | 97.1% |
| Vihtavuori N540 | <<locked>> | 94% | 39,537 psi | 89% | 2448 fps | 96.8% |
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% | 32,706 psi | 74% | 2264 fps | 97.8% |
| Accurate 2460 | <<locked>> | 80% | 34,838 psi | 79% | 2326 fps | 95.2% |
| Accurate 2495 | <<locked>> | 80% | 26,440 psi | 60% | 2172 fps | 96% |
| Accurate 2520 | <<locked>> | 86% | 36,318 psi | 82% | 2405 fps | 95.3% |
| Accurate 4064 | 41.1 gr | 90% | 32,982 psi | 75% | 2352 fps | 95.6% |
| Alliant AR-Comp | 36.1 gr | 80% | 29,805 psi | 67% | 2274 fps | 99.1% |
| Alliant Reloder-10x | <<locked>> | 80% | 36,869 psi | 83% | 2365 fps | 99.4% |
| Hodgdon H322 | <<locked>> | 80% | 35,099 psi | 79% | 2356 fps | 96.8% |
| Hodgdon H335 | <<locked>> | 80% | 35,404 psi | 80% | 2365 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,150 psi | 57% | 1404 fps | 100% |
| IMR 3031 | 36.1 gr | 80% | 28,689 psi | 65% | 2244 fps | 95.1% |
| IMR 4198 | <<locked>> | 80% | 37,811 psi | 85% | 2346 fps | 99.9% |
| Lovex D073.6 | <<locked>> | 90% | 37,057 psi | 84% | 2434 fps | 95.5% |
| Norma 202 | <<locked>> | 86% | 34,432 psi | 78% | 2346 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,121 psi | 57% | 1437 fps | 100% |
| ReloadSwiss RS 40 | <<locked>> | 82% | 37,101 psi | 84% | 2375 fps | 95% |
| Rottweil R 901 | <<locked>> | 82% | 35,346 psi | 80% | 2310 fps | 95.4% |
| Shooters World Match Rifle | <<locked>> | 90% | 37,057 psi | 84% | 2434 fps | 95.5% |
| SNPE Vectan SP 3 | <<locked>> | 80% | 36,825 psi | 83% | 2359 fps | 98.1% |
| SNPE Vectan Tubal 3000 | <<locked>> | 84% | 34,911 psi | 79% | 2267 fps | 95.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 31,952 psi | 72% | 2224 fps | 95.6% |
| Somchem S335 | <<locked>> | 80% | 30,951 psi | 70% | 2195 fps | 95.1% |
| Vihtavuori N130 | <<locked>> | 80% | 35,302 psi | 80% | 2283 fps | 99% |
| Vihtavuori N133 | <<locked>> | 80% | 30,908 psi | 70% | 2198 fps | 97% |
| Vihtavuori N135 | <<locked>> | 80% | 26,658 psi | 60% | 2162 fps | 95.6% |
| Vihtavuori N140 | <<locked>> | 86% | 32,721 psi | 74% | 2283 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 90% | 35,273 psi | 80% | 2359 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 27 powders for .33 Win. loaded with the .338 | 180gr | Impala LW CFN. Alliant AR-Comp delivers the highest muzzle velocity at 2,493 fps; across all powders the maximum-charge window runs from 1,572 fps to 2,493 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 27 of the 27 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 76–90 %, leaving at least 10 % headroom. The 180.0 gr projectile in 0.338" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14 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 AR-Comp, Accurate 4064, IMR 3031 rank at the top here: for .33 Win. with the .338 | 180gr | Impala LW CFN 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.