Lee 90188 New Lube & Size Kit .510 Diameter Sizer Die|Punch|Case 7|8x14 Threads in.

The Lee 90188 New Lube & Size Kit is a .510 diameter bullet sizing solution designed for cast bullet reloaders working with single-stage presses. This kit handles the two most tedious parts of the cast-bullet workflow—lubing and sizing—in one efficient operation. If you're casting your own bullets and want to speed up prep time without fussing with separate tools, this kit simplifies the process significantly.

The system works by pushing bullets nose-first through the sizing die, eliminating the need for special nose punches. That straightforward approach is part of what makes Lee sizing kits popular among handloaders who value simplicity and speed. The kit automatically seats and crimps gas checks in place as the bullet passes through, so once a cast bullet is lubricated and fitted with a check, one stroke handles both tasks. Sized bullets drop into the included container for easy collection and counting.

The die features standard 7/8x14 threads, which fit any conventional single-stage reloading press—no proprietary adapters needed. This is a complete kit for the .510 diameter, so you get the sizing die, punch, and collection case all together. Keep in mind that you'll need to supply your own single-stage press and liquid bullet lubricant (commonly Alox) to complete the setup. The kit is built specifically for single-stage use; it's not rated for progressive or turret presses.

For best results with cast bullets, Lee recommends selecting a sizing die that's .001" larger than your bullet's groove diameter. If you're working with gas-check bullets, apply lube first, seat the check on the bullet base, then run the loaded bullet through the die—the sizing and check crimping happen in one pass.

Key Features

• Sizes cast bullets to .510 diameter
• Automatically seats and crimps gas checks during sizing
• Push-through design eliminates need for special nose punches
• Includes sizing die, punch, and collection case
• Standard 7/8x14 threads fit any single-stage press
• Bullets captured in container for organized reloading
• Designed for single-stage press use only

Specifications

Frequently Asked Questions

Will this kit work with my progressive or turret press?

No. The Lee 90188 is designed exclusively for single-stage reloading presses. Lee does not recommend it for progressive or turret-style equipment.

What lubricant should I use with this kit?

Lee recommends liquid Alox bullet lubricant. It's applied before the bullet enters the sizing die. The lubricant is sold separately and is not included in this kit.

Do I need a top punch for my bullet mold to use this kit?

No. One of the advantages of this sizing kit is that it eliminates the need for a top punch. The push-through design works without one.

What if my cast bullets are slightly different diameters—will this one kit work?

The kit sizes to .510" diameter. Lee recommends choosing a sizing die that's .001" larger than your bullet's groove diameter for best results. If your bullets vary significantly from this size, you may need a different sizing kit.