Introduction to Winchester AutoComp Powder

Winchester AutoComp powder is a versatile smokeless powder developed by Winchester Repeating Arms Company specifically for reloading automatic pistol cartridges like 9mm Luger and .40 S&W. First introduced in the late 1990s, AutoComp has proven itself as a consistent powder choice for both competition and self-defense applications.

What is Winchester AutoComp Powder?

Winchester AutoComp powder is a unique extruded powder formulation optimized for pistol cartridges frequently used in semi-automatic firearms. Made with nitrocellulose and nitroglycerin, it possesses a medium-fast burn rate well-suited to common autoloader rounds.

Where is Winchester AutoComp Powder Manufactured?

Winchester AutoComp powder has been produced at Winchester’s East Alton, Illinois facility since its market launch in the late 1990s. This plant strictly adheres to Winchester’s renowned quality control standards.

What are the Key Characteristics of Winchester AutoComp Powder?

As an extruded powder, AutoComp excels in uniform ignition and burn properties required for reliable semi-automatic cycling. It has a published burn rate of 48 grains per second, ideal for developing optimized defense and competition loads in short-action pistols.

History and Development of Winchester AutoComp Powder

When was Winchester AutoComp Powder First Introduced?

Development of Winchester AutoComp powder was completed in the mid-1990s, with its market introduction and availability to reloaders commencing in 1997.

Who Developed Winchester AutoComp Powder?

A team of expert chemists and ballisticians at Winchester’s Research facility formulated AutoComp powder specifically for autoloading firearms based on input from competitive pistol shooters.

How has Winchester AutoComp Powder Evolved Over Time?

While the core powder composition remains unchanged, Winchester has refined AutoComp’s manufacturing to ensure consistent performance and uniformity between lots produced today. Quality control also continues advancing.

Benefits and Features of Winchester AutoComp Powder

Performance and Reliability

How does Winchester AutoComp Powder Enhance Semiautomatic Function?

Its medium-fast 48gr/s burn rate provides consistent gas pressures that reliably cycle action and feed the next round in semi-autos.

What Kind of Accuracy can be Expected with AutoComp?

Many competitive pistol shooters consider AutoComp one of the most consistent powders for match-grade precision in short-action pistols, often sub-MOA or better.

Can AutoComp Improve Self-Defense Capabilities?

Yes, its reliable functioning and consistent velocities have made AutoComp a top choice for personal defense applications requiring utmost dependability.

Reloading Efficiency

How does AutoComp Contribute to Efficient Reloading?

As an extruded powder, it meters, charges and ignites uniformly for highly consistent loads essential in autoloading firearms.

What are Recommended Loads for AutoComp?

Reloaders should start low and work up carefully in small increments while monitoring for pressure signs. Manuals list extensive proven data.

Are There Tips for Optimizing Reloads with AutoComp?

Proper brass preparation and quality components further unlock AutoComp’s potential for match-grade accuracy in short-action pistols.

Safe Handling and Usage of Winchester AutoComp Powder

Storage and Handling

How Should AutoComp be Stored for Safety?

It should remain sealed in its original container, kept in a cool, dry place away from heat sources and open flames.

Are There Special Precautions for Handling AutoComp?

As with all gunpowders, avoid getting it on skin or clothing. Wear eye protection when handling and measure charges in a well-ventilated area.

What are the Recommended Storage Conditions for AutoComp?

An indoor location below 80°F with less than 60% relative humidity provides suitable long-term storage stability.

Loading and Reloading Procedures

What are the Recommended Loading Techniques for AutoComp?

Use an accurate powder measure without compacting powder gently into cases. Seat bullets uniformly using proper lubrication.

Are There Specific Considerations for Reloading with AutoComp?

Start low and work up in small increments to avoid pressure signs. Clean, undamaged brass is essential for consistent ignition and burning.

Where can Reliable Load Data be Found for AutoComp?

Winchester reloading manuals contain published load data. Additional data from reputable sources can also be safely referenced when developing loads.