IMR Load Data & Reloading Guide
IMR, an abbreviation for Improved Military Rifle, has a storied history dating back to the early 20th century, playing a crucial role in ammunition advancement and reloading innovation. Known for enhancing powder technology, IMR has been a vital part of DuPont's powder division before eventually becoming a standalone entity under Hodgdon Powder Company. Specializing in smokeless powders, IMR offers a robust lineup of reloading powders renowned for their performance across a wide variety of cartridges, from small to large calibers. IMR powders, such as IMR 4064, IMR 4350, and IMR 4895, are staples in the reloading community, offering versatility that supports precise load development for both rifle and pistol applications.
About IMR
IMR is acclaimed for upholding stringent quality standards and delivering consistent performance batch after batch. Their powders are manufactured to meticulously defined specifications that help reloaders achieve optimal ballistic results and maintain safety standards. IMR ensures that each powder variant provides consistent metering characteristics, critical for precise bullet seating and reliable groupings.
Reloaders benefit from extensive reloading data provided by IMR, which is available in printed guides and online resources, offering well-researched load data developed through comprehensive testing. This wealth of information supports handloaders in developing safe and efficient loads tailored to specific firearms and shooting disciplines.
IMR enjoys a solid reputation within the handloading community for their reliable, high-quality products, earning trust through their dedication to continuous innovation and excellence. For reloaders seeking consistency and performance in their ammunition, IMR powders represent a tried-and-true choice that has stood the test of time, making them a favorite among those committed to precision and accuracy in handloading.
Develop your own IMR Load Recipes
Use our ballistics calculator to create precise load recipes with products from this manufacturer.
Start CalculatingIMR Powders in our Database:
IMR 3031
IMR 3031 is a versatile rifle powder with a medium burn rate, ideally suited for .223 Remington, .22-250 Remington, and .308 Winchester, among other calibers. Developed as a single-base powder, it delivers consistent performance across a range of applications, predominantly in medium-sized rifles. Its extruded granule shape offers reliable metering with the appropriate equipment, though it may require some attention in progressive systems to ensure precision. Known for its temperature stability, IMR 3031 maintains predictable performance across various climatic conditions, making it favorable for both target shooting and hunting applications. Its reputation within the handloading community is well-regarded, thanks to its ability to produce accurate and consistent loads. During load development, the powder allows for fine-tuning without excessive pressure swings, offering an edge for those seeking to optimize ballistic performance. Enthusiasts favor IMR 3031 for its effective balance between pressure management and velocity output. The powder's manufacturer, IMR, is known for producing reliable propellants that cater to both seasoned and novice reloaders.
IMR 4064
IMR 4064 is a versatile medium burn rate powder that is particularly well-suited for a wide range of rifle calibers. Its burn characteristics provide reliable performance and accuracy across numerous loading densities, making it a favored choice for intermediate-sized cartridges. This single-base extruded powder offers consistent metering properties, although its cylindrical granules may require careful attention in progressive reloading setups. Handloaders often favor IMR 4064 for its excellent temperature stability, ensuring consistent performance under varying environmental conditions, which is crucial for hunters and target shooters alike. Typical applications include calibers such as .308 Winchester, .30-06 Springfield, and 7mm-08 Remington, where precise load development is crucial for optimizing accuracy and consistency. Its adaptability allows for superior load density adjustments, enabling reloaders to fine-tune for maximum precision and efficiency. The reputation of IMR in the handloading community for quality and performance makes 4064 a trusted option for those seeking reliable and repeatable results in their ammunition crafting endeavors.
IMR 4166 Enduron
IMR 4166 Enduron is a medium burn rate rifle powder, ideal for a diverse range of calibers, offering exceptional versatility akin to other propellants in the IMR series. It excels in cartridges such as .308 Winchester, .30-06 Springfield, and other mid-size rifle cartridges, making it a preferred choice among competitive shooters and hunting enthusiasts. The extruded formulation of 4166 Enduron enhances its metering properties, ensuring consistent powder charge weights and reliable ballistic performance. Notably, this powder features incorporated copper fouling eliminator technology, resulting in reduced fouling and maintenance. With its composition, IMR 4166 Enduron provides remarkable temperature stability, maintaining reliable performance across a wide range of environmental conditions, thus giving seasoned reloaders confidence in developing loads. Its primary advantage for handloaders is its flexibility, allowing for precise adjustments based on specific shooting needs. As reloaders seek consistency and accuracy, 4166 Enduron meets these requirements, bolstered by IMR's strong reputation for quality and reliability within the handloading community.
IMR 4198
IMR 4198 is a fast-burning rifle powder renowned for its versatility and consistency among handloaders. Its burn rate is well-suited for smaller capacity cartridges and reduced loads, making it an ideal choice for applications like .222 Remington, .223 Remington, .45-70 Government, and .444 Marlin. IMR 4198 features a stick powder form, which may require careful attention during the loading process to ensure accurate measurements, but it generally meters well with proper equipment. The powder exhibits excellent temperature stability, providing reliable performance across a wide range of environmental conditions, making it popular for varied shooting scenarios. Reloaders appreciate IMR 4198 for developing accurate, consistent loads with manageable recoil, particularly beneficial for target competition and varmint hunting. When developing loads, it is advisable to start with manufacturer-recommended loads and work up while monitoring pressure signs closely due to its relatively fast burn rate. IMR's longstanding reputation for high-quality, reliable powders makes 4198 a valued choice for precise ammunition construction.
IMR 4227
IMR 4227 is a versatile propellant powder with a fast burn rate, suitable for a variety of rifle and subsonic load applications. Its granular form allows for smooth metering and consistent charge weights, essential for precision shooting requirements. Known for its excellent temperature stability, IMR 4227 maintains performance across a wide range of environmental conditions, which is critical for long-range accuracy and reliable ignition in subsonic loads. Commonly paired with calibers such as .30 Carbine, .44 Magnum, and .218 Bee, IMR 4227 excels in both low-velocity rifle and high-performance pistol loads. Its fast burn rate is particularly advantageous in short-barreled firearms and those requiring efficient energy transfer without excessive recoil. For handloaders, IMR 4227 offers the advantage of reduced muzzle flash and manageable pressures, enhancing shooter comfort and safety. During load development, gradual powder increment testing is recommended to ensure optimal ballistic performance while adhering to start and maximum charge recommendations. IMR’s reputation for quality ensures that reloaders can rely on 4227 for consistent performance with each load.
IMR 4350
IMR 4350 is a medium-slow burn rate powder that has established itself as a versatile choice for a wide range of rifle calibers. Known for its consistent performance, this powder is particularly favored in producing precise loads for larger capacity rifle cases, making it an ideal option for calibers like .30-06 Springfield, .270 Winchester, and .300 Winchester Magnum. Its extruded stick form ensures reliable ignition, though it may require careful attention during metering to achieve uniform charges, especially in progressive loading setups. With temperature stability engineered into its formulation, IMR 4350 provides consistent velocities across varied shooting conditions, ensuring performance remains unaffected by moderate temperature swings. For experienced handloaders, this powder offers the advantage of predictable pressure and velocity curves, which greatly aids in the development of tailored loads. When conducting load development, attention to published data is crucial to maximize both accuracy and safety. This powder is celebrated for its ability to deliver enhanced accuracy, making it a staple in the repertoire of discerning long-range shooters.
IMR 4451 Enduron
IMR 4451 Enduron propellant is a medium burn rate powder designed specifically for rifle applications. It is part of the innovative Enduron series, featuring an extruded, short-grain physical form that facilitates smooth and consistent metering in loading equipment. The powder is noted for its impressive temperature stability, maintaining consistent performance across a wide range of environmental conditions, which is highly advantageous for handloaders seeking reliable shot-to-shot consistency. IMR 4451 is particularly suitable for popular calibers such as 30-06 Springfield, 270 Winchester, and 300 Winchester Magnum, providing excellent velocity and accuracy potential. When developing loads, reloaders will appreciate this powder's ability to mitigate copper fouling due to its modern, environmentally friendly formulation, thus prolonging barrel life. The medium burn rate of IMR 4451 delivers versatile performance, making it a valuable component for both medium and large game hunting applications, solidifying its reputation for quality and performance within the reloading community.
IMR 4831
IMR 4831 is a versatile propellant powder characterized by a slower burn rate of 1.1 on the Hodgdon burn rate chart, making it well-suited for a range of rifle applications, particularly in medium to large caliber cartridges. This extruded powder offers excellent metering properties, resulting in consistent charges and reliable performance across various loading techniques. The granule size allows for smooth operation in standard powder measures, critical for achieving uniform velocities. IMR 4831 exhibits commendable temperature stability, reducing the risk of significant velocity variation due to ambient temperature fluctuations. It is commonly paired with cartridges such as .30-06 Springfield, .270 Winchester, and .300 Winchester Magnum, providing reloaders with the ability to achieve high velocities and fine accuracy. During load development, it is crucial to start at moderate charge weights and adjust incrementally, as the slower burn rate can lead to optimal results with suitable bullet weights and seating depths. The powder's consistent performance and reliable ignition make it a favored choice among experienced handloaders seeking precision and performance in their ammunition.
IMR 4895
IMR 4895 is a versatile medium burn rate rifle powder renowned in the reloading community for its adaptability and consistent performance. It is ideally suited for a wide range of rifle cartridges, including the popular .308 Winchester and .30-06 Springfield, making it a staple among intermediate rifle shooters and match competitors. The powder's extruded grain form ensures precise and uniform metering, vital for achieving consistent velocities and pressures in handloads. Despite its extruded nature, it meters well through most volumetric powder measures, maintaining accuracy. Temperature sensitivity with IMR 4895 is minimal, providing reliable performance across varying environmental conditions, a crucial factor for competitive shooters and hunters requiring dependable results. Its moderate burn rate offers a balance of performance, fostering efficient load development and allowing tailored loads that can maximize a projectile’s ballistic potential. IMR's long-standing reputation and their stringent quality controls ensure that this powder delivers top-tier performance, cementing its position as a go-to choice for seasoned reloaders aiming for precision in their rifle loads.
IMR 4955 Enduron
IMR 4955 Enduron is a versatile rifle powder with a medium-slow burn rate, positioned slightly slower than IMR 4350, making it ideal for a wide range of popular rifle calibers. This refined propellant excels in providing uniform ignition and optimal pressure curves, particularly suited for larger cartridges typical in precision shooting and hunting applications. The 4955 Enduron features a short-cut extruded form, promoting consistent metering through powder measures, which benefits accuracy and repeatability in handloading processes. One of the key attributes of 4955 Enduron is its exceptional temperature stability, engineered to deliver consistent performance across a wide range of environmental conditions. This powder is well-suited to calibers such as the .270 Winchester, .30-06 Springfield, and .300 Winchester Magnum, offering excellent velocity and accuracy. The Enduron technology incorporates a copper fouling eliminator, enhancing barrel life and reducing maintenance intervals. For reloaders, the advantages of 4955 Enduron include its clean burn characteristics and favorable pressure management, allowing for flexibility in load development. This powder's consistency empowers experienced handloaders to fine-tune loads for precision accuracy and optimal ballistic performance.
IMR 7828 SSC
IMR 7828 SSC is a popular slow-burning powder designed for rifle loads, making it an ideal choice for magnum calibers requiring high-energy propellants. Its burn rate is particularly suited for high-velocity applications where efficiency and consistency are paramount. As a "short cut" (SSC) form of 7828, this powder offers enhanced metering properties through most powder measures, ensuring uniform charges and reducing variation in pressure and velocity. This characteristic is particularly beneficial during load development as it aids in achieving precise, repeatable results. 7828 SSC is praised for its excellent temperature stability, providing consistent performance across a wide range of weather conditions. This trait makes it a reliable choice for hunters and long-range shooters who demand precision in varying climates. Commonly paired with calibers such as .300 Winchester Magnum, 7mm Remington Magnum, and .338 Lapua Magnum, this powder enables excellent case fill and optimal ballistic performance. Handloaders appreciate its capacity to meet diverse needs, providing flexibility and precision at the bench.
IMR 7977 Enduron
IMR 7977 Enduron is a slow-burning rifle powder known for its exceptional temperature stability and modern technological advancements. Designed specifically for large capacity magnum cartridges, 7977 is ideal for handloaders looking for consistent performance across a wide range of environmental conditions. The powder’s physical form is an extruded grain, which provides uniform loading densities but may require careful metering to ensure precise charges, particularly when using volumetric measures. It excels in cartridges such as the .300 Winchester Magnum and the 7mm Remington Magnum, where its slow burn rate optimizes velocity and accuracy. Endurons' temperature-insensitive properties mean minimal variation in performance from low winter temperatures to peak summer heat, offering reliable pressure and velocity data. Handloaders appreciate its Copper Fouling Eraser technology, significantly reducing barrel fouling and extending shooting sessions. The powder is also noted for its excellent load density, providing flexibility in load development and enabling tailored performance to meet specific shooting requirements.
IMR 8133 Enduron
IMR 8133 Enduron is a slow-burning rifle powder, designed to excel in magnum calibers where large case capacities are common. It functions with a pronounced slow burn rate, suitable for use in calibers such as 300 Winchester Magnum, 7mm Remington Magnum, and 6.5mm Remington Magnum, among others. The powder's extruded form ensures consistent metering through powder measures, enhanced by advanced granulation techniques that promote uniform charge weights. IMR 8133 Enduron features superior temperature stability, maintaining performance across a broad range of environmental conditions. This stability is crucial for handloaders seeking consistent velocities and pressures in varying climates. The powder is adorned with IMR’s Enduron technology, offering reduced copper fouling and clean burning characteristics, which serve to extend barrel life and reduce maintenance needs. Load developers will find IMR 8133 Enduron advantageous in achieving high energy loads with reduced muzzle flash, making it a trusted choice for precision long-range rifle enthusiasts.
IMR 8208 XBR
IMR 8208 XBR is a rifle powder renowned among handloaders for its medium burn rate, making it highly versatile across a range of cartridge applications. Its granular form allows for precise metering, reducing variability in charge weights. Notably, 8208 XBR is celebrated for its remarkable temperature stability, providing consistent performance across varying environmental conditions, which is critical for precision shooting disciplines. This propellant excels in calibers such as .223 Remington, .308 Winchester, and 6.5mm Grendel, where accuracy and reliability are paramount. During load development, 8208 XBR's forgiving nature fosters ease in finding accurate and efficient load combinations, benefitting seasoned reloaders and newcomers alike. IMR's standing in the handloading community is reinforced by the powder's consistent batch quality, supporting confidence with each purchase. Handloaders favor this powder for competitive shooting scenarios and applications where repeatable shot-to-shot consistency is crucial, enhancing its reputation as a top choice for high-performance loads.
Standard Load Data — IMR
Select your desired cartridge and bullet weight below to access the corresponding load table. From there, you can choose any listed load recipe and transfer it directly into the ballistics calculator for further refinement, optimization, and precision tuning.
.284 | 175gr | Berger Elite Hunter
7 mm PRC
.284 | 195gr | Berger Elite Hunter
7 mm PRC
.400 | 190gr | Winchester Deer Season X400DS Legend
.400 Legend
.264 | 144gr | Berger Long Range Hybrid Target
6.5 x 55 Swedish
.308 | 150gr | Nosler Ballistic Tip Hunting
.30-06 Spring.
.224 | 77gr | Berger OTM Tactical
.22 ARC
.222 | 45gr | Prvi Partizan SP
5.45 x 39 mm
.308 | 200gr | Swift A-Frame
.30-06 Ackley Improved
.308 | 180gr | Swift Scirocco
.300 Win. Mag.
.227 | 58gr | Reichenberg HDB Universal
.225 Win.
.308 | 188gr | Discreet Ballistics Selous Machined Expander
.30-06 Spring.
.204 | 40gr | Berger Varmint
.204 Ruger
.284 | 180gr | Berger VLD Hunting
7 mm PRC
.264 | 120gr | Nosler Ballistic Tip Hunting
6.5 x 55 Swedish
.224 | 60gr | Berger FB Varmint
.223 Rem.
.227 | 50gr | Impala RNFP KO
5.6 x 52 R
.243 | 100gr | MEN SP
6 mm XC
.277 | 150gr | Berger VLD Hunting
.270 Win.
.224 | 62gr | Barnes TAC-X
.22 Creedmoor
.308 | 180gr | Fox Classic Hunter
.300 Win. Mag.
.284 | 160gr | Nosler AccuBond
7 mm Rem. SA Ultra Mag.
.204 | 35gr | Berger FB Varmint
.20 BR
.243 | 90gr | Nosler AccuBond
6 mm ARC (bolt action rifles only)
.321 | 180gr | Frontier PH HPFB
8 x 57 I
Community Loads — IMR
Sample load data using IMR bullets or powders from our database.
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Frequently Asked Questions
We offer load data for 14 IMR powders, including IMR 3031, IMR 4064, IMR 4166 Enduron, IMR 4198, IMR 4227.