Load Specifications
Load data in caliber .33 Win. with .338 | 138gr | Sax KJG-SR bullet and 15 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-10x, Norma 200 and Alliant AR-Comp.
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 1680 | <<locked>> | 82% | 39,102 psi | 88% | 2690 fps | 97.8% |
| Accurate 2015 | <<locked>> | 98% | 39,856 psi | 90% | 2795 fps | 97.1% |
| ADI AR 2207 | <<locked>> | 86% | 38,696 psi | 87% | 2769 fps | 99.9% |
| Alliant AR-Compᴾ | <<locked>> | 100% | 39,508 psi | 89% | 2871 fps | 99.2% |
| Alliant Reloder-10x | <<locked>> | 92% | 38,667 psi | 87% | 2792 fps | 97.9% |
| Alliant Reloder-7 | <<locked>> | 84% | 38,101 psi | 86% | 2713 fps | 98.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 30,763 psi | 70% | 1791 fps | 100% |
| IMR 4198 | <<locked>> | 90% | 38,827 psi | 88% | 2740 fps | 98.6% |
| Norma 200 | <<locked>> | 88% | 38,580 psi | 87% | 2776 fps | 98.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 30,385 psi | 69% | 1831 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 82% | 38,116 psi | 86% | 2516 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 92% | 39,755 psi | 90% | 2792 fps | 96.1% |
| Vihtavuori N120 | <<locked>> | 86% | 38,928 psi | 88% | 2733 fps | 100% |
| Vihtavuori N130 | <<locked>> | 94% | 39,784 psi | 90% | 2746 fps | 97.9% |
| Vihtavuori N133 | <<locked>> | 98% | 38,812 psi | 88% | 2730 fps | 96.5% |
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 1680 | <<locked>> | 80% | 36,622 psi | 83% | 2635 fps | 97.2% |
| Accurate 2015 | <<locked>> | 94% | 35,273 psi | 80% | 2694 fps | 95.8% |
| ADI AR 2207 | <<locked>> | 80% | 31,850 psi | 72% | 2612 fps | 99.2% |
| Alliant AR-Comp | 42.2 gr | 90% | 29,022 psi | 66% | 2598 fps | 95.8% |
| Alliant Reloder-10x | 38.4 gr | 84% | 30,023 psi | 68% | 2582 fps | 95.2% |
| Alliant Reloder-7 | <<locked>> | 80% | 33,620 psi | 76% | 2608 fps | 97% |
| Hodgdon TrailBoss | <<locked>> | 80% | 22,684 psi | 51% | 1604 fps | 100% |
| IMR 4198 | <<locked>> | 80% | 29,211 psi | 66% | 2497 fps | 95.6% |
| Norma 200 | 37.9 gr | 80% | 29,921 psi | 68% | 2562 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 22,321 psi | 50% | 1640 fps | 100% |
| SNPE Vectan BA6 1/2 | <<locked>> | 80% | 36,085 psi | 82% | 2477 fps | 100% |
| SNPE Vectan SP 3 | <<locked>> | 90% | 37,231 psi | 84% | 2736 fps | 95.3% |
| Vihtavuori N120 | <<locked>> | 80% | 32,097 psi | 73% | 2582 fps | 99.8% |
| Vihtavuori N130 | <<locked>> | 86% | 31,096 psi | 70% | 2546 fps | 95.2% |
| Vihtavuori N133 | <<locked>> | 94% | 34,505 psi | 78% | 2631 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 15 powders for .33 Win. loaded with the .338 | 138gr | Sax KJG-SR. Alliant AR-Comp delivers the highest muzzle velocity at 2,871 fps; across all powders the maximum-charge window runs from 1,791 fps to 2,871 fps. Alliant AR-Comp gives the best case fill at 100 %, and 15 of the 15 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (305 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 138.0 gr projectile in 0.338" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Alliant AR-Comp, 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 Reloder-10x, Norma 200, Alliant AR-Comp rank at the top here: for .33 Win. with the .338 | 138gr | Sax KJG-SR 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.