Lee 90953 Factory Crimp Die .50 BMG
Lee's Factory Crimp Die firmly secures bullets in place, improving accuracy through higher start pressure and more uniform pressure curves, even with non-grooved bullets.
Lee Factory Crimp Die for .50 BMG
The Lee 90953 Factory Crimp Die represents a straightforward approach to one of reloading's most important steps: securing the bullet firmly in the case.
How It Works
Unlike standard seating dies, the factory crimp die applies a dedicated crimping operation after bullet seating. This firm crimp accomplishes something fundamental to accurate ammunition: it forces pressure to build to a higher level before the bullet can move in the case.
Why This Matters
Improved Accuracy: Testing demonstrates that even bullets without a crimp groove shoot more accurately when firmly crimped. The reason is straightforward—a higher start pressure ensures a more uniform pressure curve throughout the firing cycle, which directly translates to less velocity variation from round to round.
Consistency: Uniform pressure curves mean uniform velocities. Uniform velocities mean tighter groups and more predictable ballistics downrange.
Specifications
- Large series design (1 1/4x12 thread)
- Compatible with Lee Classic Cast Press
- Designed for .50 BMG cartridges
- Works with any bullet, grooved or ungrooved
The Bottom Line
For serious .50 BMG reloaders, the factory crimp die is not an optional refinement—it's a fundamental tool for extracting maximum accuracy from your ammunition.
