Reliable .38 Special reloading data is available in established publisher manuals from Lyman, Hornady, Speer, and the Hodgdon Reloading Data Center. Published data normally includes the specific bullet design, starting powder charge, maximum published powder charge, expected velocity, and cartridge overall length. Common bullet weights covered by published .38 Special load data range from 110-grain defense projectiles to 148-grain wadcutters and 158-grain lead semi-wadcutters. Results naturally vary between sources due to differences in the exact bullet, powder lot, brass, primer type, test barrel length, and whether the load is tested to standard or +P pressures.
.38 Special Reloading Data
| Bullet | Bullet Weight | Powder | Published Starting Load | Published Maximum Load | Published Velocity | Pressure (Max) | Primer & Case | Cartridge Overall Length (COL) | Barrel Length / Firearm | Source |
| Hornady XTP | 125 grain | Hodgdon Titegroup | 4.3 gr | 4.8 gr | 1,027 fps | 16,100 CUP | Small Pistol / Winchester | 1.455″ | 7.70″ / Universal | Hodgdon |
| Cast LRN | 130 grain | Accurate No. 2 | 4.1 gr | 4.6 gr | 891 fps | 16,500 PSI | Small Pistol / Winchester | 1.440″ | 4.00″ / Universal | Western Powders |
| Speer HBWC | 148 grain | Alliant Bullseye | 2.8 gr | 3.1 gr | 799 fps | 16,000 CUP | Small Pistol / Federal | 1.295″ | 6.00″ / Universal | Alliant / Speer |
| Cast LSWC | 158 grain | Winchester 231 | 3.1 gr | 3.7 gr | 834 fps | 13,300 CUP | Small Pistol / Winchester | 1.475″ | 7.70″ / Universal | Hodgdon |
| Hornady XTP | 158 grain | Hodgdon Universal | 4.0 gr | 4.5 gr | 874 fps | 16,100 CUP | Small Pistol / Winchester | 1.455″ | 7.70″ / Universal | Hodgdon |
| Speer LSWC | 158 grain | Alliant Unique | 4.0 gr | 4.5 gr | 796 fps | Not Listed | Small Pistol / Speer | 1.440″ | 6.00″ / Universal | Alliant |
| Hornady XTP (+P) | 125 grain | Power Pistol | 5.7 gr | 6.3 gr | 1,061 fps | 19,500 PSI | Small Pistol / Federal | 1.455″ | 4.00″ / Vented | Hornady |
| Hornady XTP (+P) | 158 grain | Winchester 231 | 4.3 gr | 4.6 gr | 904 fps | 19,600 CUP | Small Pistol / Winchester | 1.455″ | 7.70″ / Universal | Hodgdon |
Understanding The .38 Special Reloading Data
To safely develop a .38 Special load recipe, handloaders must understand the specific variables documented in published load data charts:
- Starting load: The minimum safe powder charge. Reloaders should always begin here to establish a baseline. Dropping below starting charges with slow-burning powders can cause hazardous squib loads.
- Maximum published load: The maximum safe powder limit tested by the laboratory. Exceeding this risks frame stretching or catastrophic failure.
- Velocity: The bullet speed in feet per second (fps). Standard .38 Special loads typically range from 700 to 950 fps.
- Pressure: The standard .38 Special has a SAAMI maximum average pressure limit of 17,000 PSI. The .38 Special +P is rated for 20,000 PSI.
- Bullet weight: The mass of the projectile in grains.
- Powder: The specific propellant. Fast-burning pistol powders are exclusively used.
- Barrel length: The laboratory test barrel length. Vented barrels mimic revolver cylinder gaps, while unvented universal receivers yield higher velocities.
- Firearm used for testing: Universal receivers or production revolvers.
- Test conditions: Altitude, humidity, and temperature variables during pressure testing.
- Cartridge overall length (COL): The total length of the loaded round. Because revolvers are not restricted by feeding ramps, COL is primarily dictated by the bullet’s crimp groove and cylinder length.
Different published sources may produce varying results because they use brass with different internal volumes, differing primer brands, varying powder lots, and unvented versus vented test barrels.
.38 Special Bullet Weight Reloading Data
Because of its extensive history, .38 Special reloading data encompasses a broad spectrum of bullet weights and profiles, from lightweight defense hollow points to heavy cast lead designs.
- 110 grain: Lightweight jacketed hollow points (JHPs) designed for high velocity and low recoil. Typically driven to around 1,000 fps in standard pressure loads.
- 125 grain to 130 grain: Highly popular defense and target weights. The 125-grain XTP or 130-grain Full Metal Jacket (FMJ) are heavily supported by data from Hornady and Hodgdon, offering a strong balance of velocity and energy.
- 148 grain: The classic target weight, specifically the Lead Wadcutter (LWC) or Hollow Base Wadcutter (HBWC). These bullets are seated completely flush with the case mouth and are driven at very low velocities (700-800 fps) for ultimate accuracy and minimal recoil.
- 158 grain: The traditional, original standard weight for the .38 Special. Copious data exists for 158-grain Lead Semi-Wadcutters (LSWC) and JHPs. These offer excellent penetration and sight regulation in vintage fixed-sight revolvers.
Do not assume every bullet weight has identical pressure curves. A 148-grain wadcutter occupies significantly more space inside the cartridge case than a standard 158-grain bullet, which dictates specialized, extremely low powder charges.
.38 Special Powder Reloading Data
The .38 Special operates at low pressure and relies on fast-burning pistol powders to ensure complete ignition and consistent velocities.
| Powder | Bullet | Bullet Weight | Published Starting Load | Published Maximum Load | Published Velocity | Source |
| Hodgdon Titegroup | Hornady XTP | 125 grain | 4.3 gr | 4.8 gr | 1,027 fps | Hodgdon |
| Winchester 231 | Cast LSWC | 158 grain | 3.1 gr | 3.7 gr | 834 fps | Hodgdon |
| Alliant Bullseye | Speer HBWC | 148 grain | 2.8 gr | 3.1 gr | 799 fps | Alliant |
| Accurate No. 2 | Cast LRN | 130 grain | 4.1 gr | 4.6 gr | 891 fps | Western Powders |
| Power Pistol | Hornady XTP (+P) | 125 grain | 5.7 gr | 6.3 gr | 1,061 fps | Hornady |
Never use a powder charge designed for a jacketed bullet with a cast lead bullet of the exact same weight without consulting a manual. Lead bullets create less bore friction than copper jackets, altering the necessary powder charge.
.38 Special Bullet And Powder Combinations
The safety and consistency of .38 Special reloading data depend on matching the exact components.
- Bullet construction and bearing surface: A jacketed hollow point (JHP) requires a slightly heavier powder charge to overcome bore friction compared to a lubricated cast lead bullet of the same weight.
- Seating depth and case capacity: Because the .38 Special was originally designed for black powder, it has a massive internal volume relative to modern smokeless powder charges. Seating a bullet deeper than published COLs reduces this volume and spikes pressure.
- Primer: Standard small pistol primers are universally recommended. Magnum primers are generally unnecessary unless utilizing heavily compressed loads of slower powders (which is rare in this caliber).
- Crimp: The .38 Special requires a firm roll crimp into the bullet’s cannelure or crimp groove. This prevents the bullet from pulling forward under recoil and tying up the revolver cylinder.
- Powder position sensitivity: Because modern charges (like 3.0 grains of Bullseye) occupy very little space inside the large .38 Special case, some powders can be position-sensitive, yielding slightly different velocities depending on whether the powder is resting against the primer or the bullet.
.38 Special Velocity From Published Data
Published .38 Special velocity figures vary dramatically based on the test equipment utilized.
| Bullet | Bullet Weight | Powder | Published Load | Muzzle Velocity | Barrel Length | Firearm | Source |
| Hornady XTP | 125 grain | Titegroup | 4.8 gr (Max) | 1,027 fps | 7.70″ | Universal Receiver | Hodgdon |
| Hornady XTP (+P) | 125 grain | Power Pistol | 6.3 gr (Max) | 1,061 fps | 4.00″ | Vented Test Barrel | Hornady |
| Cast LSWC | 158 grain | W231 | 3.7 gr (Max) | 834 fps | 7.70″ | Universal Receiver | Hodgdon |
It is crucial to distinguish between unvented universal receiver barrels (which yield artificially high velocities) and vented test barrels (which mimic the cylinder gap of a real revolver). Do not present a 7.7-inch unvented laboratory velocity as achievable from an off-the-shelf snub-nose revolver.
.38 Special Reloading Data By Barrel Length
Barrel length heavily dictates the velocity a reloader will achieve. A significant portion of .38 Special reloading data is tested in 7.7-inch unvented laboratory barrels, producing velocities that shooters will never see in the field.
When firing a 158-grain standard pressure load, a 7.7-inch test barrel may record 850 fps. That identical load fired from a 4-inch service revolver will typically drop to roughly 750 fps. Fired from a 1.875-inch snub-nose revolver, velocity often plummets to the 650 fps range. Reloaders must clearly identify the test firearm and barrel length when setting ballistic expectations, as short barrels shed velocity rapidly due to the cylinder gap bleeding off gas pressure.
.38 Special Energy And Ballistics
The .38 Special is a low-velocity cartridge relying on heavy bullet mass for momentum. Using verified manufacturer data:
- 158-grain LSWC (Standard Pressure at 834 fps):
- Muzzle energy: ~244 ft-lbs
- 125-grain XTP (+P Load at 1,061 fps):
- Muzzle energy: ~312 ft-lbs
Because the cartridge is exclusively designed for short-range target shooting and self-defense, 50-yard and 100-yard retained energy figures are rarely prioritized in load manuals. The blunt, low-BC projectiles shed their kinetic energy quickly.
Manufacturer Data vs Independent Testing
Reloaders consulting a .38 Special load data chart will encounter:
- Manufacturer-published reloading data: Officially pressure-tested in a laboratory using copper crushers (CUP) or piezo-electric sensors (PSI) to guarantee loads stay safely under the 17,000 PSI (Standard) or 20,000 PSI (+P) limits.
- Independent chronograph testing: Velocities recorded by handloaders using commercial chronographs over real revolvers. This verifies speed but cannot measure internal chamber pressure.
- User-submitted load reports: Internet forum recipes that often ignore the critical distinction between standard and +P pressures.
Independently measured results frequently differ from published data because consumer revolvers feature varying cylinder gap tolerances. A tighter cylinder gap will yield higher velocities than a loose one. Priority must always remain with official, pressure-tested manufacturer limits.
.38 Special Pressure And Safety
Safety is paramount when using .38 Special reloading data due to the vast age range of firearms chambered in this caliber.
The standard SAAMI pressure limit is 17,000 PSI. Many vintage revolvers from the early 20th century were designed exclusively for these low pressures. The .38 Special +P data generates 20,000 PSI. Using +P reloading data in an older, non-+P rated revolver can cause frame stretching, timing issues, or catastrophic cylinder failure.
Because modern smokeless powder charges (such as Titegroup or Bullseye) take up a fraction of the case capacity, it is incredibly easy to accidentally double-charge a .38 Special case without the powder overflowing. Reloaders must use strict visual checks inside every single case before seating a bullet. Furthermore, a firm roll crimp is mandatory; without it, recoil can pull unfired bullets forward out of their cases, jamming the rotation of the cylinder.
Best Sources For .38 Special Reloading Data
The most authoritative sources for safe .38 Special load development include:
- Hodgdon Reloading Data Center: Provides the most extensive, free online data highlighting Winchester, IMR, and Hodgdon powders for both Standard and +P pressures.
- Lyman Cast Bullet Handbook: The absolute definitive source for reloading cast lead bullets (148-grain wadcutters and 158-grain LSWCs), which are incredibly popular in this caliber.
- Hornady Handbook of Cartridge Reloading: Offers comprehensive component specificity for their XTP jacketed defense bullets.
- Alliant Powder Reloader’s Guide: The best source for traditional, classic powder recipes using Bullseye, Unique, and Power Pistol.
These publishers offer laboratory pressure verification, precise overall length measurements, and complete transparency regarding standard versus +P pressure limits.
Common .38 Special Reloading Data Questions
Where can I find .38 Special reloading data?
Authoritative data is available in the Lyman Reloading Handbook, the Hornady Reloading Handbook, and free online via the Hodgdon Reloading Data Center.
What powders are used in published .38 Special data?
Common powders include Alliant Bullseye, Hodgdon Titegroup, Winchester 231 (HP-38), Alliant Unique, and Accurate No. 2.
What bullet weights have .38 Special reloading data?
Published data covers lightweight 110-grain jacketed bullets up to 158-grain standard lead semi-wadcutters, and occasionally heavy 200-grain historical loads.
What is the best source for .38 Special reloading data Hodgdon?
The official Hodgdon Reloading Data Center provides the most rigorously pressure-tested data for all Hodgdon, IMR, and Winchester brand powders.
Why does .38 Special reloading data vary between sources?
Variations occur due to the massive spectrum of bullet profiles, differences between unvented universal test barrels and vented test barrels, and different brass case volumes.
Does barrel length affect .38 Special velocity?
Yes. A 1.875-inch snub-nose revolver will consistently yield significantly lower velocities than a 4-inch or 6-inch revolver using the exact same load.
Can the same powder charge be used with a different bullet?
No. Different bullet profiles, materials (cast lead vs copper jacketed), and seating depths alter internal case capacity and friction, which dramatically changes chamber pressures.
What is the difference between starting and maximum published load data?
The starting load is the safe baseline for working up a new recipe. The maximum load is the highest pressure limit established safely by a ballistic laboratory.
Where can I find pressure-tested .38 Special data?
Pressure-tested data is available directly from major bullet and powder manufacturers, including Hornady, Hodgdon, Speer, and Lyman.
Does Hodgdon publish .38 Special reloading data?
Yes. Hodgdon provides extensive data specifically developed for the cartridge, covering standard pressure and +P loads across their entire family of pistol powders.
Does Hornady publish .38 Special reloading data?
Yes. Hornady publishes data tailored specifically for their 0.357-inch projectiles, including the highly popular 125-grain and 158-grain XTP lines.
Does Nosler publish .38 Special reloading data?
Yes. Nosler publishes data for their jacketed handgun bullets, covering popular defense and target weights.
Does Lyman publish .38 Special data?
Yes. Lyman’s handbooks, especially the Cast Bullet Handbook, provide some of the most extensive and historically significant data available for lead projectiles in this caliber.