Take your brass prep to the next level and keep your high-volume workflow moving with the Lee Precision Automatic Processing Press Large Swage Punch (91566). Designed for seamless use with the Lee Automatic Processing Press (APP), this large swage punch helps reloaders quickly and consistently remove primer pocket crimps from large-primer brass, making priming smoother, safer, and dramatically more efficient—especially when working with once-fired military or crimped commercial cases.
If you’re searching for a Lee APP large swage punch, Lee Precision 91566, large primer pocket swage, or 734307915667, this component is a must-have upgrade for reloaders who process a lot of brass and want consistent results without slowing down their operation.
What the Lee APP Large Swage Punch Does
Many once-fired cases—especially military-sourced brass—feature crimped primer pockets. That crimp is great for factory reliability, but it creates friction and resistance when you go to seat a new primer. Without swaging (or reaming), crimped pockets can cause:
Excessively tight primer seating
Crushed or damaged primers
Inconsistent primer depth
Slowdowns and stoppages during the priming stage
The Lee Large Swage Punch is designed to swage (reform) the primer pocket back to a usable dimension by pushing the crimp out of the way rather than cutting material. The result is brass that primes with a smoother, more uniform feel—an important step for producing consistent, reliable ammunition.
Made for the Lee Automatic Processing Press (APP)
The Lee APP system is built to handle repetitive brass processing tasks efficiently. This large swage punch integrates into that ecosystem so you can process large-primer brass quickly and with repeatable results, helping you turn mixed once-fired brass into load-ready brass without bottlenecks.
Why the APP-compatible design matters:
Maintains a fast, consistent brass prep rhythm
Helps reduce setup hassles and trial-and-error workarounds
Supports batch processing for serious reloaders
Keeps swaging aligned with the APP’s high-throughput purpose
If you’ve invested in the APP for efficiency, adding the correct swage punch is one of the most practical ways to expand what your press can do.
Large Primer Pocket Swaging: The Right Tool for the Right Brass
This is the large swage punch, intended for cases that use large primers. Many popular cartridges use large primers, and large-primer brass is commonly found in bulk once-fired lots—especially from sources where primer crimps are more likely.
Using the correct punch size is key for proper results:
Proper swage sizing helps primers seat reliably
Reduces the risk of deforming the pocket from incorrect tooling
Improves consistency across large batches
(Always confirm whether your brass uses large or small primers before processing.)
Why Swage Crimped Primer Pockets Instead of Fighting Them?
Crimped pockets can turn priming into a frustrating, time-consuming chore. Swaging is a clean, repeatable solution that saves time and reduces risk—especially when you’re loading large batches.
Key benefits of swaging with a dedicated punch:
Smoother primer seating during loading
Fewer damaged primers and fewer interruptions
More consistent primer depth and feel
Faster production in high-volume workflows
Better reliability when assembling ammunition for training, competition, or hunting
For many reloaders, swaging becomes a standard part of brass prep—especially when dealing with mixed once-fired brass sources.
Ideal For High-Volume Reloaders and Range Brass Processing
The Lee Precision APP Large Swage Punch (91566) is a great fit if you:
Process large amounts of once-fired brass
Work with brass that often has military-style primer crimps
Want to speed up brass prep and reduce manual steps
Prefer swaging (reforming) over reaming (cutting) for primer pocket prep
Need a dedicated large primer pocket solution for the Lee APP platform
It’s also an excellent spare to keep on hand if you routinely switch between small and large primer brass—helping you stay ready for any batch.
Product Identification
Brand: Lee Precision
Product: Automatic Processing Press Large Swage Punch
Model / Part Number: 91566
UPC: 734307915667
Make Primer Pocket Prep Faster, Smoother, and More Consistent
When you’re loading in volume, efficiency matters—and primer pocket crimps can quickly become the biggest bottleneck in your process. The Lee Precision Automatic Processing Press Large Swage Punch (91566) is a simple, high-impact upgrade that helps you swage large primer pockets quickly and consistently using the Lee APP system, turning crimped brass into load-ready brass with far less effort.
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