Load Specifications
Load data in caliber .38 Special with .357 | 148gr | CamPro HBWC bullet and 7 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon TrailBoss and ReloadSwiss RS 14.
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 ≥ 60% and propellant combustion ≥ 80%. 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: 4"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AP 100*² | <<locked>> | 68% | 19,072 psi | 88% | 997 fps | 87.7% |
| Alliant Herco² | <<locked>> | 64% | 17,970 psi | 83% | 958 fps | 98.7% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 64% | 17,970 psi | 83% | 906 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 17,811 psi | 82% | 869 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 16,012 psi | 74% | 863 fps | 100% |
| Rottweil P 806*² | <<locked>> | 64% | 18,246 psi | 84% | 1017 fps | 90.5% |
| Vihtavuori N32C Tin Star² | <<locked>> | 72% | 18,202 psi | 84% | 863 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 4"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| ADI AP 100*² | <<locked>> | 64% | 16,868 psi | 78% | 948 fps | 85.2% |
| Alliant Herco² | <<locked>> | 60% | 16,172 psi | 74% | 919 fps | 97.7% |
| Baschieri & Pellagri 102 Pistol² | <<locked>> | 60% | 15,548 psi | 71% | 860 fps | 100% |
| Hodgdon TrailBoss² | 3.6 gr | 60% | 7,310 psi | 34% | 620 fps | 99.8% |
| ReloadSwiss RS 14² | 3.7 gr | 60% | 6,730 psi | 31% | 610 fps | 96.6% |
| Rottweil P 806*² | <<locked>> | 60% | 15,592 psi | 72% | 955 fps | 87.2% |
| Vihtavuori N32C Tin Star² | <<locked>> | 60% | 13,169 psi | 61% | 768 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
* not dangerous but load has suboptimal powder burnt with possible characteristics such as extensive muzzle flash or inaccurate loads.
² fill rate low - you might want to consider using a filler to ensure proper ignition.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 2 powders for .38 Special loaded with the .357 | 148gr | CamPro HBWC. Hodgdon TrailBoss delivers the highest muzzle velocity at 869 fps; across all powders the maximum-charge window runs from 863 fps to 869 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 2 of the 2 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (150 MPa), the top charges use 74–82 %, leaving at least 18 % headroom. 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. Hodgdon TrailBoss, ReloadSwiss RS 14 rank at the top here: for .38 Special with the .357 | 148gr | CamPro HBWC they combine a high case fill with complete burn and sit in the upper velocity band. Hodgdon TrailBoss, ReloadSwiss RS 14 stay subsonic at start load. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.