The Lee App Bulge Buster Kit (brand part no. 91572), used together with the separately sold Lee Carbide Factory Crimp Die, restores free function to rimless cases that have developed low base bulges. Those bulges usually come from chambers that do not fully support the cartridge, or from cases resized in carbide dies from manufacturers other than Lee, and they show up as a noticeable stop ring near the case base. Handloaders working mixed range brass are the most likely to run into cases with this problem.

Key Specifications

• Corrects low base bulges caused by unsupported chambers or non-Lee carbide sizing.
• Designed for rimless cases, most commonly encountered in mixed range brass.
• Requires the Lee Carbide Factory Crimp Die, sold separately, to complete the fix.
• Most often needed for mixed, multi-source range brass rather than once-fired brass from your own gun.

Frequently Asked Questions

What causes a low base bulge? Chambers that do not fully support the cartridge, or cases previously resized in a non-Lee carbide die, both commonly leave a stop ring near the case base.

Do I need anything else to use this kit? Yes, the Lee Carbide Factory Crimp Die for your caliber is required and sold separately.

Who runs into this problem most? Handloaders working with mixed range brass from unknown chambers are the most likely to find cases with base bulges.

Buy the Lee App Bulge Buster Kit

Lee Precision built this kit specifically to rescue brass that would otherwise get tossed for a stubborn base bulge. Order it from our reloading equipment catalog and our Lubbock, Texas gun shop will ship it directly.