Load Specifications
Load data in caliber .33 Win. with .338 | 172gr | Sax KDG-S bullet and 24 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant AR-Comp, Alliant Reloder-10x and Accurate 2015.
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>> | 94% | 38,319 psi | 87% | 2444 fps | 98.3% |
| Accurate 2495ᴾ | <<locked>> | 100% | 34,142 psi | 77% | 2448 fps | 97.8% |
| Accurate LT-30 | <<locked>> | 84% | 37,985 psi | 86% | 2343 fps | 96.7% |
| ADI AR 2207 | <<locked>> | 82% | 39,015 psi | 88% | 2420 fps | 100% |
| ADI AR 2219 | <<locked>> | 86% | 39,146 psi | 88% | 2473 fps | 96.7% |
| Alliant AR-Comp | <<locked>> | 96% | 39,885 psi | 90% | 2540 fps | 99.9% |
| Alliant Reloder-10x | <<locked>> | 88% | 39,291 psi | 89% | 2460 fps | 99.2% |
| Baschieri & Pellagri 106 | <<locked>> | 86% | 39,914 psi | 90% | 2391 fps | 97.4% |
| Hodgdon H322 | <<locked>> | 92% | 39,682 psi | 90% | 2484 fps | 96.9% |
| Hodgdon H4198 | <<locked>> | 82% | 38,827 psi | 88% | 2353 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,750 psi | 74% | 1562 fps | 100% |
| IMR 3031ᴾ | <<locked>> | 100% | 39,827 psi | 90% | 2526 fps | 97.5% |
| IMR 4198 | <<locked>> | 86% | 38,798 psi | 88% | 2403 fps | 99.6% |
| Norma 200 | <<locked>> | 84% | 39,682 psi | 90% | 2446 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,924 psi | 74% | 1601 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 88% | 37,869 psi | 86% | 2434 fps | 97.5% |
| SNPE Vectan Tubal 3000 | <<locked>> | 94% | 39,769 psi | 90% | 2396 fps | 95.6% |
| SNPE Vectan Tubal 5000ᴾ | <<locked>> | 100% | 39,305 psi | 89% | 2383 fps | 96.3% |
| Somchem S335 | <<locked>> | 94% | 38,682 psi | 87% | 2404 fps | 96.5% |
| Vihtavuori N120 | <<locked>> | 84% | 38,783 psi | 88% | 2374 fps | 100% |
| Vihtavuori N130 | <<locked>> | 90% | 39,334 psi | 89% | 2405 fps | 99% |
| Vihtavuori N133 | <<locked>> | 96% | 38,479 psi | 87% | 2401 fps | 98.1% |
| Vihtavuori N135ᴾ | <<locked>> | 100% | 36,434 psi | 82% | 2464 fps | 98.1% |
| Vihtavuori N140 | <<locked>> | 98% | 38,870 psi | 88% | 2445 fps | 95.8% |
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 | 34.9 gr | 84% | 27,978 psi | 63% | 2218 fps | 95% |
| Accurate 2495 | <<locked>> | 94% | 27,963 psi | 63% | 2306 fps | 95.7% |
| Accurate LT-30 | <<locked>> | 80% | 33,576 psi | 76% | 2251 fps | 95.3% |
| ADI AR 2207 | <<locked>> | 80% | 36,796 psi | 83% | 2378 fps | 100% |
| ADI AR 2219 | <<locked>> | 82% | 34,534 psi | 78% | 2374 fps | 95.2% |
| Alliant AR-Comp | 33.6 gr | 80% | 25,005 psi | 57% | 2168 fps | 96% |
| Alliant Reloder-10x | 32.8 gr | 80% | 31,038 psi | 70% | 2282 fps | 97.4% |
| Baschieri & Pellagri 106 | <<locked>> | 80% | 33,243 psi | 75% | 2255 fps | 95.5% |
| Hodgdon H322 | <<locked>> | 88% | 35,288 psi | 80% | 2391 fps | 95.5% |
| Hodgdon H4198 | <<locked>> | 80% | 36,695 psi | 83% | 2309 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 23,873 psi | 54% | 1396 fps | 100% |
| IMR 3031 | <<locked>> | 94% | 32,837 psi | 74% | 2391 fps | 95.6% |
| IMR 4198 | <<locked>> | 80% | 32,953 psi | 74% | 2278 fps | 98.6% |
| Norma 200 | <<locked>> | 80% | 35,317 psi | 80% | 2359 fps | 99% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 23,728 psi | 54% | 1429 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 82% | 31,444 psi | 71% | 2293 fps | 95.3% |
| SNPE Vectan Tubal 3000 | <<locked>> | 92% | 37,579 psi | 85% | 2354 fps | 95% |
| SNPE Vectan Tubal 5000 | <<locked>> | 96% | 34,243 psi | 77% | 2302 fps | 95% |
| Somchem S335 | <<locked>> | 90% | 34,534 psi | 78% | 2319 fps | 95.2% |
| Vihtavuori N120 | <<locked>> | 80% | 34,780 psi | 79% | 2300 fps | 100% |
| Vihtavuori N130 | <<locked>> | 80% | 29,559 psi | 67% | 2193 fps | 96.6% |
| Vihtavuori N133 | <<locked>> | 86% | 29,196 psi | 66% | 2193 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 92% | 28,616 psi | 65% | 2280 fps | 95.4% |
| Vihtavuori N140 | <<locked>> | 96% | 36,289 psi | 82% | 2398 fps | 95.1% |
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 24 powders for .33 Win. loaded with the .338 | 172gr | Sax KDG-S. Alliant AR-Comp delivers the highest muzzle velocity at 2,540 fps; across all powders the maximum-charge window runs from 1,562 fps to 2,540 fps. Accurate 2495 gives the best case fill at 100 %, and 24 of the 24 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 74–90 %, leaving at least 10 % headroom. The 172.0 gr projectile in 0.338" calls for a 1:14.5 twist; slower twists will usually not stabilise this weight. Accurate 2495, Hodgdon TrailBoss, IMR 3031 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, Alliant Reloder-10x, Accurate 2015 rank at the top here: for .33 Win. with the .338 | 172gr | Sax KDG-S 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.