Lee Precision 90815 Factory Crimp Die 458 SOCOM

The Lee Precision Factory Crimp Die for 458 SOCOM transforms ammunition reloading by delivering the firm, consistent bullet seating that separates match-grade handloads from mediocre ones. This rifle reloading die uses a collet-based crimping system that squeezes the case mouth into the bullet's crimp groove with precision, ensuring every round seats identically. Whether you're loading for a bolt-action hunting rifle, AR-platform build, or precision rifle competition, a proper crimp is foundational to accuracy and reliability.

Most reloaders underestimate how much a loose bullet affects downrange performance. Without a firm crimp, bullet movement during the pressure curve creates velocity variation and inconsistent point-of-impact. The Factory Crimp Die eliminates this problem by establishing a higher initial pressure before bullet movement begins, resulting in a uniform pressure curve and tighter velocity spreads. Testing has shown that even bullets without a crimp groove benefit from this die's approach, making it a smart upgrade for anyone serious about reloading accuracy.

Setup is straightforward: the die threads into any standard 7/8"-14 reloading press, making it compatible with Lee and most other press designs. Note that a shellholder is sold separately. This is a dedicated crimping tool—use it as a final reloading step after seating your bullet, and you'll notice the difference in consistency and grouping immediately.

Key Features

• Collet-based crimping system for firm, uniform bullet seating
• Improves accuracy by establishing consistent initial pressure
• Works with 458 SOCOM ammunition and rifles
• Compatible with all 7/8"-14 threaded reloading presses
• Reduces velocity variation for tighter groups

Specifications

Frequently Asked Questions

Will this die work in my reloading press?

Yes, if your press has a standard 7/8"-14 threaded opening. This includes Lee, RCBS, Hornady, and most other major brands. If you're unsure about your press, verify the thread size before ordering.

Do I need a shellholder?

Yes, a shellholder is required but not included with this die. You'll need a 458 SOCOM shellholder, sold separately.

How does crimping improve accuracy?

A firm crimp prevents bullet movement during the pressure curve, ensuring consistent bullet jump and establishing a uniform pressure profile. This reduces shot-to-shot velocity variation and tightens groups.

When should I use the Factory Crimp Die in my loading sequence?

Use it as a final step after seating the bullet in the cartridge case. The collet applies crimping pressure independently of the sizing or seating operation.