Reliable 38 Special +P reloading data can be found in official manufacturer manuals and online databases published by industry leaders such as Hodgdon, Alliant, Hornady, and Speer. Published data typically covers bullet weights from 110 grains up to 158 grains, detailing starting and maximum powder charges, muzzle velocities, chamber pressures up to SAAMI maximum limits of 20,000 PSI, which is higher than the standard 17,000 PSI limit for regular .38 Special loads, cartridge overall length, and test barrel specifications. Because .38 Special +P is a high-pressure defensive cartridge, minor component variations in brass case volume, small pistol primer selection, seating depth, and roll crimp tension can significantly alter pressure and revolver extraction outcomes.
38 Special +P Reloading Data Overview
| Bullet | Bullet Weight | Powder | Published Starting Load | Published Maximum Load | Published Velocity | Source |
| Hornady XTP | 110 gr | Hodgdon Titegroup | 4.8 gr | 5.3 gr | 1,050 to 1,150 fps | Hodgdon / Hornady |
| Speer Gold Dot | 125 gr | Alliant Unique | 5.5 gr | 6.2 gr | 950 to 1,040 fps | Alliant / Speer |
| Hornady XTP | 125 gr | Hodgdon HP-38 | 4.8 gr | 5.4 gr | 930 to 1,010 fps | Hodgdon |
| Sierra JHC | 140 gr | Hodgdon Universal | 4.5 gr | 5.0 gr | 880 to 960 fps | Hodgdon / Sierra |
| Lead Semi-Wadcutter | 158 gr | Alliant Unique | 4.8 gr | 5.5 gr | 890 to 970 fps | Alliant / Custom |
Understanding The .38 Special +P Reloading Data
Working up .38 Special +P load data requires careful technical evaluation because the increased pressure ceiling demands strict adherence to safe component limits:
- Starting Load: The conservative minimum charge weight recommended by testing laboratories to ensure clean combustion and reliable velocity.
- Published Maximum Load: The absolute peak pressure threshold established by testing facilities, running up to the SAAMI limit of 20,000 PSI. Exceeding this value can cause dangerous overpressure and difficult extraction in revolvers.
- Velocity: Quantified in feet per second at the muzzle, indicating how efficiently a given powder charge accelerates a specific projectile weight.
- Pressure: Measured in PSI. SAAMI establishes a Maximum Average Pressure limit of 20,000 PSI for .38 Special +P, compared to 17,000 PSI for standard pressure loads.
.38 Special +P Bullet Weight Options
Published load data spans several distinct projectile weight classes tailored for personal defense and target shooting:
- 110 Grain: High-velocity lightweight options designed for rapid expansion and reduced recoil in compact defensive revolvers.
- 125 Grain: The classic defensive standard offering an optimal balance of velocity, penetration, and reliable expansion across various barrel lengths.
- 158 Grain: Heavy-for-caliber options such as lead semi-wadcutters providing deep penetration and traditional momentum for self-defense or field use.
.38 Special +P Powder Reloading Data
Selecting the correct powder involves matching fast-burning to medium-fast pistol propellants that build efficient pressure curves within a revolver case:
| Powder | Bullet | Bullet Weight | Published Starting Load | Published Maximum Load | Published Velocity | Source |
| Hodgdon Titegroup | Hornady XTP | 110 gr | 4.8 gr | 5.3 gr | 1,050 to 1,150 fps | Hodgdon |
| Alliant Unique | Speer Gold Dot | 125 gr | 5.5 gr | 6.2 gr | 950 to 1,040 fps | Alliant |
| Hodgdon HP-38 | Hornady XTP | 125 gr | 4.8 gr | 5.4 gr | 930 to 1,010 fps | Hodgdon |
| Hodgdon Universal | Sierra JHC | 140 gr | 4.5 gr | 5.0 gr | 880 to 960 fps | Hodgdon |
| Alliant Unique | Lead SWC | 158 gr | 4.8 gr | 5.5 gr | 890 to 970 fps | Alliant |
Component And Assembly Best Practices
Because revolvers rely on solid case retention and proper crimping under heavy recoil, specific steps are required:
- Cartridge Overall Length: Standard specifications require an overall length typically set near 1.550 inches depending on the bullet profile to ensure smooth cylinder rotation.
- Primer Selection: Standard small pistol primers are used. Ensure consistent seating depth to prevent high primers that can bind the revolver cylinder.
- Crimp Requirements: A firm roll crimp into the bullet cannelure or crimp groove is mandatory to prevent heavy bullets from jumping forward out of the case under recoil in lightweight revolvers.
Velocity And Barrel Length Considerations
Manufacturer velocity figures are typically generated using test barrels measuring 4 inches to 6 inches in length. Real-world defensive revolvers featuring short snubs with 1.87-inch to 2-inch barrels will experience significant velocity reductions. Handloaders should verify actual speeds with a physical chronograph.
Pressure And Safety Warning
The .38 Special +P operates at an increased pressure ceiling of 20,000 PSI:
- Never fire +P ammunition or reloads in antique revolvers, lightweight aluminum-frame guns not rated for +P, or standard older .38 Special firearms. Only use +P loads in modern revolvers specifically rated by the manufacturer.
- Visually inspect every powder-charged case in the loading block before seating bullets to prevent improper charges.
Best Sources For .38 Special +P Data
The top references for reliable data include:
- Hodgdon Online Reloading Center: Provides extensive, pressure-tested recipes covering versatile powders like Titegroup and HP-38.
- Alliant Powder Reloader’s Guide: Features comprehensive data tailored for popular propellants like Unique and Universal.
- Hornady and Speer Manuals: Offer specialized guidance for defensive bullet lines.
Common .38 Special +P Reloading Questions
Where can I find .38 Special +P reloading data?
Reliable data is available through official online portals and print manuals published by Hodgdon, Alliant, Hornady, and Speer.
What powders are popular for .38 Special +P?
Top-performing propellants include Hodgdon Titegroup, HP-38, Alliant Unique, and Universal.
What is the max pressure for .38 Special +P?
SAAMI establishes a maximum average pressure limit of 20,000 PSI for .38 Special +P, compared to 17,000 PSI for standard pressure loads.
Can I use +P reloads in any .38 Special revolver?
No. You must only fire +P loads in modern firearms specifically rated for higher pressures by the manufacturer. Never use them in vintage or light-frame revolvers not rated for +P.
Do I need a roll crimp for .38 Special +P?
Yes. A firm roll crimp is critical to prevent bullets from pulling forward under recoil, which can jam the cylinder rotation.