Lee Precision Automatic Processing Press (App) Bulge Buster Kit
$22.50
The Lee Precision Automatic Processing Press (APP) Bulge Buster Kit is a specialized reloading die accessory that solves a real problem handloaders encounter: low base bulges in rimless pistol cases. If you've pulled mixed range brass or resized cases in non-Lee carbide dies, you've probably noticed a visible ring near the base of some cartridges. That bulge prevents cases from seating properly in your magazine and feeding reliably—a frustration that stops your reloading session cold. The Bulge Buster kit is the fix.
Low base bulges typically develop when cases are sized in chambers that don't fully support the cartridge wall, or when you're working with cases resized on equipment from manufacturers other than Lee. It's not a sign of defective ammunition; it's just a geometry mismatch. The Bulge Buster die removes that interference and restores your brass to factory-spec dimensions so it chambers and feeds like new. This is an essential tool if you reload pistol cartridges and aren't selective about your brass source.
To use the kit, you'll also need the appropriate Lee Carbide Factory Crimp Die for your caliber (sold separately). The combination works across a range of common handgun calibers—from .380 ACP through .45 ACP and beyond. If you're serious about getting usable ammunition from range pickups or bulk brass lots, this kit earns its place on your reloading bench.
Key Features
- Removes low base bulges from rimless pistol cases
- Restores cases resized in non-Lee carbide dies
- Works with mixed or range-picked brass
- Compatible with multiple handgun calibers
- Used in conjunction with Lee Carbide Factory Crimp Die
Specifications
| Product | Lee APP Bulge Buster Kit |
| Compatible Calibers | .380 ACP, 10mm, .40 S&W, .41 AE, .45 ACP, .45 GAP, .45 Win Mag |
| Requires | Lee Carbide Factory Crimp Die (sold separately) |
| Use Case | Handgun reloading |
Frequently Asked Questions
What exactly is a low base bulge and why does it matter?
A low base bulge is a noticeable ring near the base of a cartridge case that prevents it from seating properly in a magazine or feeding reliably into a chamber. It usually develops when cases are sized in chambers that don't fully support the case wall, or when you resize in carbide dies from manufacturers other than Lee. It's most common in mixed range brass.
Do I need anything else to use the Bulge Buster Kit?
Yes. You'll need to purchase the appropriate Lee Carbide Factory Crimp Die separately for your specific caliber. The kit and the crimp die work together to correct the bulge and restore proper case dimensions.
Which calibers can I use the Bulge Buster Kit with?
The kit is compatible with .380 ACP, 10mm, .40 S&W, .41 AE (using the .40 S&W Factory Crimp Die), .45 ACP, .45 GAP, and .45 Win Mag.
Will this work on brass I've already resized in my own carbide dies?
Yes, if those dies are from a manufacturer other than Lee, the bulge correction process works on cases that have already been sized that way. If you're working primarily with Lee carbide dies, you're less likely to encounter bulges in the first place.
