Hodgdon HP-38 stands as one of the most venerable and widely utilized smokeless propellants in the history of handgun reloading. For decades, this double-base spherical powder has been the bedrock of high-volume target shooting, law enforcement training, and competitive pistol disciplines. The reputation of Hodgdon HP-38 is built upon a foundation of extreme versatility, consistent metering, and a pressure curve that is ideally suited for the most popular centerfire handgun cartridges in existence. It is important to note for the technical reloader that Hodgdon HP-38 is chemically identical to Winchester 231, and the two propellants can be used interchangeably with identical load data, as they are produced in the same facility to the same exacting specifications.
The market role of Hodgdon HP-38 is that of a “do-it-all” propellant for standard-pressure handgun applications. While it was not designed for the extreme velocities of magnum hunting rounds, it has defined the performance standards for the 38 Special, 9mm Luger, and 45 ACP. Its longevity in the Hodgdon catalog is a testament to its reliability; in an era where new propellants are introduced annually with various marketing claims, Hodgdon HP-38 remains a top seller because it simply works across an incredibly broad range of bullet weights and case volumes. For the reloader seeking a single powder to manage an entire stable of handguns, Hodgdon HP-38 is often the first and final recommendation.
Executive Summary
- Main Application – High-volume target and service loads for 9mm Luger, 38 Special, and 45 ACP.
- Key Advantage – Fluid-like metering and excellent economic efficiency.
- Burn Rate Position – Fast-to-medium handgun propellant.
- What This Guide Covers – Chemical composition, metering precision, temperature sensitivity, and optimized cartridge pairings.
Best For: High-volume reloaders and competitive shooters who require a single, reliable propellant for all standard-pressure handgun calibers.
Powder Description & Technical Profile
Technically, Hodgdon HP-38 is a double-base, spherical propellant that incorporates a specific percentage of nitroglycerin to enhance its energy density and ignition consistency. The “spherical” or “ball” geometry refers to the physical shape of the grains, which are small, uniform rounds that have been flattened during the manufacturing process to increase their surface area. This flattening is a critical design feature of Hodgdon HP-38, as it allows for a more controlled and progressive burn than a perfectly round sphere would provide. The deterrent coatings applied to the exterior of the grains further regulate the burn rate, ensuring that the pressure builds at a safe and predictable pace for handgun actions.
The physical density of Hodgdon HP-38 is one of its most advantageous traits. It is a dense powder, meaning it occupies less space for its weight compared to flake powders like Alliant Unique. This allows it to fit easily into small cases like the 380 ACP or the 9mm Luger without fear of compressed loads or bullet seating depth issues. Furthermore, the chemical formulation of Hodgdon HP-38 is designed for cleanliness. While no powder is completely residue-free, Hodgdon HP-38 burns exceptionally clean at the upper end of its pressure range, which is why it is so frequently chosen by shooters who use semi-automatic platforms that are sensitive to carbon fouling.
Pros & Cons
- Pro – Metering is nearly perfect in every type of mechanical powder measure.
- Pro – Highly economical; small charge weights lead to a high number of rounds per pound.
- Pro – Versatile enough to load everything from 32 ACP to moderate 44 Magnum.
- Pro – Very easy to ignite with standard non-magnum primers.
- Con – Can be “sooty” if used in ultra-low pressure loads below its efficient burn window.
- Con – Not suitable for maximum-velocity magnum hunting applications.
- Con – Sensitive to extreme temperature variations compared to modern “Extreme” line powders.
Technical Characteristics
The technical profile of Hodgdon HP-38 illustrates its role as a stable, high-energy propellant. Its specific gravity and burn speed are tuned for the rapid cycling times of modern semi-automatic handguns and the consistent velocities required for revolver accuracy.
| Feature | Specification |
| Manufacturer | Hodgdon Powder Company |
| Powder Type | Double-Base |
| Grain Shape | Flattened Spherical |
| Base Type | Nitroglycerin / Nitrocellulose |
| Relative Burn Rate Category | Fast-to-Medium Handgun |
| Density (g/cc) | 0.680 – 0.700 |
| Primary Application | Standard Pressure Handgun |
With a bulk density of approximately 0.690 g/cc, Hodgdon HP-38 strikes a balance between being compact enough for small cases and voluminous enough to be easily inspected during the loading process. This density is a key factor in its legendary metering performance, as the weight-to-volume ratio remains extremely consistent from the top of the powder hopper to the bottom.
Temperature Stability & Burn Rate Analysis
In the hierarchy of handgun propellants, Hodgdon HP-38 sits in the fast-to-mid-range burn rate segment. It is slower than ultra-fast powders like Accurate Nitro 100 NF or Hodgdon Titegroup, yet it is significantly faster than medium-rate powders like Hodgdon Universal or Alliant Unique. This specific position on the burn rate chart is the “sweet spot” for standard-pressure handgun cartridges. It allows the powder to reach peak pressure quickly enough to be efficient in short barrels, yet it stays behind the bullet long enough to generate respectable velocities without exceeding SAAMI pressure limits.
Temperature stability for Hodgdon HP-38 is considered average for a traditional double-base spherical powder. While it is more stable than many older flake-style propellants, it does exhibit some velocity sensitivity when subjected to extreme temperature swings. In testing, a load developed at 70 degrees Fahrenheit may show a velocity drop of 25-40 FPS when fired at 20 degrees Fahrenheit. Conversely, in high-heat environments exceeding 100 degrees, pressures can climb slightly. For target shooters and plinkers, these deviations are usually statistically insignificant. However, for a competitive shooter working near a specific “Power Factor” threshold, it is wise to develop loads with a small safety margin to account for environmental changes. Compared to a modern benchmark of stability like Hodgdon Varget, Hodgdon HP-38 is more sensitive, but within the context of handgun distances, it remains a highly predictable performer.
Powder Comparison
When selecting Hodgdon HP-38, reloaders are usually deciding between it and other “standard” handgun powders that offer similar versatility.
| Powder | Relative Burn Rate | Density | Primary Cartridges |
| Hodgdon HP-38 | Fast-Medium (Subject) | 0.690 | 9mm Luger, 45 ACP |
| Hodgdon Titegroup | Faster | 0.730 | 9mm Luger, 40 SW |
| Accurate No. 2 | Slightly Faster | 0.700 | 380 ACP, 9mm Luger |
| Hodgdon Universal | Slower | 0.520 | 20 gauge, 45 ACP |
The most common comparison is between Hodgdon HP-38 and Hodgdon Titegroup. While Titegroup is often praised for its extreme economy and lack of position sensitivity, Hodgdon HP-38 is generally considered to be cleaner-burning in the 45 ACP and provides a softer recoil impulse in many 38 Special loads. Compared to Hodgdon Universal, Hodgdon HP-38 is much easier to measure through small volumetric apertures. Against Winchester 231, there is no comparison, as they are the same powder; the choice between them usually comes down to which brand is available on the local shelf.
Performance, Metering & Equipment
The metering characteristics of Hodgdon HP-38 are the industry benchmark for spherical propellants. Because the grains are so small and have been flattened into uniform discs, they flow through the internal mechanics of a powder measure with almost zero friction or “bridging.” When using a high-quality measure like the Lyman Brass Smith Powder Measure, Hodgdon HP-38 consistently drops charges with a variance of +/- 0.05 grains. This level of precision is virtually impossible to achieve with large flake powders like Alliant Unique, which often require a 0.2-grain tolerance window.
For the progressive reloader using a machine like the Dillon XL 750, Hodgdon HP-38 is a dream to work with. It does not “leak” from the powder bar as easily as some ultra-fine spherical powders, yet it is fluid enough to ensure that the charge weight remains consistent even at high cycling speeds. On a single-stage press such as the RCBS Rock Chucker Supreme, the reloader can trust the volumetric drop so implicitly that “checking every 10th charge” is often more than sufficient for safety. Furthermore, the powder does not exhibit significant static cling, making it easy to pour from the container into the measure and back again without a messy cleanup.
Recommended Cartridges and Applications
While Hodgdon HP-38 can be used in almost any handgun cartridge, it has specific calibers where it is widely regarded as the “best in class” propellant.
| Cartridge | Primary Application |
| 9mm Luger | Standard 115-124 grain Target Loads |
| 45 ACP | 230 grain Ball and Target Loads |
| 38 Special | 158 grain Service and +P Loads |
| 44 Special | Traditional Target and Range Loads |
| 380 ACP | Compact Defensive Practice |
| 40 SW | Practice and Medium Velocity Loads |
In the 9mm Luger, Hodgdon HP-38 is legendary for producing the exact velocities of factory service ammunition with very low standard deviations. In the 45 ACP, it is the standard against which all other powders are measured for 230-grain Full Metal Jacket loads. Even in the 38 Special, it provides the necessary gas volume to expand the skirt of lead bullets for excellent accuracy in revolvers with slightly oversized cylinder throats.
Bullets
Because of its mid-range burn rate, Hodgdon HP-38 works effectively with a wide variety of bullet types, including lead, plated, and jacketed designs. It is particularly well-suited for standard-weight projectiles for a given caliber.
| Bullet Model | Weight Range | Recommended Application |
| Sierra Sports Master | 115-124 grain | 9mm Luger Target |
| Hornady Interlock | 158 grain | 38 Special Target |
| Sierra Sports Master | 230 grain | 45 ACP Ball |
| Speer TNT | 90-100 grain | 380 ACP Varmint/Practice |
| Coated Lead | 200 grain | 45 ACP Target SWC |
When loading for the 45 ACP, a 230-grain jacketed round nose bullet paired with Hodgdon HP-38 creates a load that replicates factory “Hardball” ammunition perfectly. For the 38 Special, the 158-grain lead semi-wadcutter is a classic choice, as the powder’s double-base chemistry provides enough heat to ensure a clean burn even at the lower pressures of target revolvers.
Primers
Hodgdon HP-38 is remarkably easy to ignite. It does not require the high-intensity flash of a magnum primer to achieve a complete and uniform burn. In fact, using magnum primers with Hodgdon HP-38 can sometimes lead to erratic pressure spikes in small-volume cases like the 9mm Luger. Standard primers are almost always the correct choice for this propellant to maintain the intended pressure curve.
Recommended Primers for Hodgdon HP-38:
- CCI 500 (Small Pistol) – The “gold standard” for 9mm Luger.
- Winchester WSP (Small Pistol) – Excellent consistency for 38 Special.
- Federal 100 (Small Pistol) – Best for revolvers with lightened trigger springs.
- CCI 300 (Large Pistol) – Standard for 45 ACP and 44 Special.
- Federal 150 (Large Pistol) – Very reliable for target loads.
- Winchester WLP (Large Pistol) – Designed for both standard and magnum, works very well with HP-38.
- Remington 1-1/2 (Small Pistol) – A solid choice for low-pressure loads.
- Sellier & Bellot V360157 (Small Pistol) – Cost-effective for high-volume reloading.
In the 45 ACP, the CCI 300 provides a very stable platform for Hodgdon HP-38, ensuring that the powder is ignited uniformly across the large surface area of the case. For competitive 9mm shooters, the Winchester WSP is often preferred for its slightly softer cup, which helps in identifying pressure signs early during load development.
Conclusion & Expert Verdict
Hodgdon HP-38 is, quite simply, the essential handgun propellant. It manages to balance efficiency, economy, and performance in a way that very few other powders have ever achieved. While there are specialty powders that may produce slightly higher velocities or marginally cleaner burns in specific niche applications, none of them offer the comprehensive versatility of Hodgdon HP-38. It is a powder that allows a reloader to buy in bulk – often in 8-pound kegs – and know that they can satisfy the needs of every handgun on their bench.
The true value of Hodgdon HP-38 lies in its predictability. In an activity where safety is paramount, having a propellant that meters perfectly, ignites easily, and has decades of documented load data is an invaluable asset. Whether you are a novice reloader just beginning your journey with a 38 Special or a seasoned competitive shooter burning through 20,000 rounds of 9mm Luger a year, Hodgdon HP-38 provides the consistency required to turn high-volume reloading into high-confidence shooting. It is, and will likely remain, the cornerstone of the handgun reloader’s world.
Expert Pro Tip: When loading Hodgdon HP-38 for the 9mm Luger, pay close attention to your case mouth flare. Because the grains of Hodgdon HP-38 are very small, if you over-flare the case mouth, you can sometimes get a few grains that “stick” to the inside of the flare due to static or lubricants. This can cause the grains to fall out during the indexing of a progressive press. A minimal flare that just allows the bullet to sit squarely will keep the loading process cleaner and ensure that every bit of that precisely metered charge stays exactly where it belongs – inside the case.
