Achieve Unmatched Precision and Reliability in Your .356 Winchester and .358 Winchester Reloads with the Lee Factory Crimp Rifle Die

Are you a dedicated rifle enthusiast, a seasoned hunter, or a precision shooter who demands the utmost consistency and safety from your handloaded ammunition? Do you frequently encounter issues like bullet setback in your tubular magazine rifles, inconsistent ignition, or variations in your muzzle velocities? If so, the Lee 90904 Factory Crimp Rifle Die for .356 Winchester and .358 Winchester is an indispensable tool designed to solve these exact challenges, elevating your reloading process to a professional standard.

This specialized die from Lee Precision is not just another accessory; it's a critical component for optimizing the performance and reliability of your handloads, especially for bottleneck rifle cartridges like the .356 Win and .358 Win. These versatile cartridges are popular among lever-action rifle owners and those who appreciate their potent performance in various hunting and shooting scenarios. However, ensuring consistent bullet retention and reliable feeding in these platforms requires a crimp that is both strong and precise, a task the Lee Factory Crimp Die excels at.

Understanding the Power of a Perfect Crimp: Why It Matters for Rifle Ammunition

For many new to handloading, the concept of crimping can seem secondary to seating the bullet or charging the powder. However, for rifle ammunition, particularly rounds like the .356 Winchester and .358 Winchester, an effective and consistent crimp is paramount for several reasons:

1. Preventing Bullet Setback: This is perhaps the most critical function of a rifle crimp, especially for cartridges used in tubular magazine firearms or semi-automatic rifles. During recoil, or when rounds jostle in a magazine, bullets can be inadvertently pushed deeper into the cartridge case. This phenomenon, known as "bullet setback," significantly reduces the internal case volume, leading to a dangerous and unpredictable spike in chamber pressure upon firing. The Lee Factory Crimp Die applies a robust crimp that locks the bullet firmly in place, virtually eliminating the risk of setback and ensuring safer, more consistent performance.
2. Ensuring Consistent Ignition: The crimp provides resistance against the bullet, allowing chamber pressure to build up more consistently before the bullet begins to move. This consistent "bullet pull" leads to a more uniform powder burn, which in turn translates to more consistent muzzle velocities. In the world of precision shooting and hunting, where every foot per second counts, consistent velocities are a cornerstone of tighter groups and more predictable ballistics.
3. Improved Feeding Reliability: A properly crimped round maintains its overall length (OAL) and shape, ensuring smooth, snag-free feeding from the magazine into the chamber. This is particularly vital for lever-action rifles and semi-automatic platforms where any deviation from standard cartridge dimensions can lead to costly malfunctions in the field or on the range.
4. Enhanced Accuracy: By controlling bullet pull and ensuring consistent powder burn, the Lee Factory Crimp Die directly contributes to improved accuracy. When every round performs nearly identically, variables are reduced, allowing the shooter to focus on technique and external factors rather than ammunition inconsistencies.

So, if you're asking, "How do I get better accuracy from my .356 Win or .358 Win handloads?" or "What's the best way to prevent bullet setback in my lever-action rifle?", the answer unequivocally involves implementing a superior crimping method, and the Lee Factory Crimp Die is designed to deliver precisely that.

Unpacking the Unique Engineering of the Lee 90904 Factory Crimp Die

What sets the Lee Factory Crimp Die apart from traditional roll or taper crimp dies? Its innovative design is the key to its superior performance:

• The Revolutionary Collet-Style Crimp: Unlike dies that apply a simple roll or taper crimp by pushing the case mouth into a cannelure or reforming the case, the Lee Factory Crimp Die utilizes a unique collet system. Four hardened steel segments within the die body apply an even, circumferential crimp directly onto the bullet. This design allows the die to crimp the bullet anywhere along its surface, meaning a cannelure (crimp groove) is not required. This is a significant advantage, offering unparalleled versatility for various bullet types, including those designed for other applications.
• The Segmented Grip: This segmented approach ensures that the crimp is uniformly applied around the entire circumference of the bullet. This even pressure minimizes bullet deformation and avoids creating an unsightly or inconsistent crimp that could compromise accuracy or feeding. The result is a factory-like crimp that securely holds the bullet without overworking the brass or damaging the projectile.
• Integrated Carbide Sizing Ring: A hallmark of many Lee Factory Crimp Dies, the 90904 model includes a carbide sizing ring located at the bottom of the die. This critical feature ensures that every finished cartridge is sized to factory specifications, even if the bullet seating process slightly bulges the case or if the brass dimensions are marginally off. By passing through this carbide ring after the bullet has been seated but before the crimp is applied, the case is brought back to SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) minimum dimensions. This guarantees that your handloads will chamber freely and reliably in any firearm chambered for .356 Win or .358 Win, eliminating the frustrating "plunk test" failures often associated with oversized finished rounds.
• Simple and Intuitive Adjustment: Setting up the Lee Factory Crimp Die is remarkably straightforward. It doesn't require complex calculations or delicate adjustments. You simply thread the die into your reloading press, lower the ram with a seated cartridge, and turn the die down until you achieve your desired crimp. This ease of use makes it an excellent choice for both novice and experienced reloaders seeking consistent results without a steep learning curve.
• Durable Construction: Built with Lee Precision's commitment to quality, the 90904 die is crafted from robust materials designed to withstand years of heavy use. Its hardened steel components ensure longevity and consistent performance, making it a reliable addition to your reloading bench.

Who Benefits Most from the Lee 90904 Factory Crimp Rifle Die?

This specific die is particularly beneficial for:

• Lever-Action Rifle Shooters: Owners of iconic lever-action rifles chambered in .356 Winchester or .358 Winchester will find this die essential. The tubular magazines of these firearms mean that cartridges are stacked end-to-end. Without a strong crimp, recoil can cause the bullet of one round to be driven into the primer of the cartridge in front of it, leading to disastrous consequences. The Lee Factory Crimp Die virtually eliminates this hazard by firmly securing the bullet.
• Hunters: When you're out in the field, reliability is non-negotiable. A misfeed or an inconsistent shot can mean the difference between a successful hunt and a missed opportunity. The enhanced safety, feeding reliability, and improved accuracy offered by a proper crimp provide invaluable peace of mind.
• Precision Reloaders: For those meticulously chasing tighter groups and squeezing every last bit of performance out of their rifle, the consistency in bullet pull and velocity achieved with this die is a significant advantage.
• Reloaders Using Diverse Bullet Types: If you experiment with various bullet weights or designs for your .356 Win or .358 Win, including cast bullets without a cannelure, the Lee Factory Crimp Die's ability to crimp anywhere on the bullet provides unmatched flexibility.
• Anyone Seeking Increased Safety: Bullet setback is a real and dangerous concern. This die directly addresses that risk, making your handloads safer to shoot.

Step-by-Step: How to Integrate the Lee Factory Crimp Die into Your Reloading Process

Incorporating the Lee 90904 Factory Crimp Die into your reloading routine is simple and typically performed as the final step before inspection and loading:

1. Complete Prior Steps: Ensure your cartridge cases are properly sized, deprimed, reprimed, charged with powder, and the bullet has been fully seated to your desired overall length (OAL) using your seating die. The Lee Factory Crimp Die is not a seating die; its sole purpose is to apply the crimp after the bullet is already seated.
2. Install the Die: Thread the Lee Factory Crimp Die into the desired station on your reloading press.
3. Initial Adjustment: Raise the ram to its full height with a loaded (but uncrimped) cartridge in the shell holder. Screw the die body down until you feel it make firm contact with the shell holder.
4. Set the Crimp: Lower the ram. Now, turn the die body down incrementally, typically 1/4 to 1/2 turn at a time. With each adjustment, raise the ram to full height and apply the crimp.
5. Test and Fine-Tune: Remove the crimped cartridge and inspect it visually. You'll notice a distinct, clean crimp mark around the bullet. For cartridges intended for tubular magazines, a stronger crimp is generally desired to prevent setback. For other applications, a lighter crimp may suffice. Test the crimped rounds for proper feeding and chambering in your firearm. The carbide ring will have already ensured they fit, but observe the crimp itself. Adjust as necessary until you achieve the desired amount of crimp that holds the bullet securely without deforming it or excessively wrinkling the case mouth. Remember, a common reloading mistake is over-crimping, which can shorten brass life or deform bullets. Start light and increase gradually.

Beyond the Basics: Comparing Crimp Methods for Rifle Cartridges

While various crimping methods exist, understanding the distinction highlights the advantages of the Lee Factory Crimp Die:

• Roll Crimp: Primarily used for revolver cartridges where a distinct cannelure on the bullet provides a positive locking point. It works by rolling the case mouth into this cannelure. While effective for its intended purpose, applying a roll crimp to bottleneck rifle cartridges without a cannelure can lead to case mouth deformation or inconsistent crimping.
• Taper Crimp: Commonly used for semi-automatic pistol cartridges. It works by removing the flare from the case mouth and providing light tension to hold the bullet. Taper crimps generally don't offer the robust bullet retention needed for rifle cartridges, especially those subjected to significant recoil or tubular magazine pressures.
• Lee Factory Crimp Die (Collet Crimp): This method stands apart. By utilizing a segmented collet, it applies a secure, concentric crimp anywhere on the bullet. It doesn't rely on a cannelure, doesn't over-work the case mouth like an aggressive roll crimp, and provides far more bullet retention than a typical taper crimp. Its ability to uniformly size the case mouth via the carbide ring after bullet seating is another unique benefit, preventing issues with oversized loaded rounds. This combination makes it arguably the most versatile and effective crimping solution for bottleneck rifle cartridges.

Considerations for Reloading .356 Winchester and .358 Winchester

Both the .356 Winchester and .358 Winchester are potent, medium-bore rifle cartridges. The .356 Win was developed for lever-action rifles and is often found in Winchester Model 94s, making bullet setback prevention absolutely crucial. The .358 Win, a necked-down .308 Winchester case, offers excellent power in a short-action rifle, suitable for various game.

When reloading these cartridges, precise bullet seating and a secure crimp are paramount, especially if you're using them for hunting where reliable performance in adverse conditions is essential. The Lee 90904 Factory Crimp Die ensures that the bullets in your .356 Win and .358 Win handloads stay exactly where they're supposed to be, through recoil, transport, and rapid cycling, contributing significantly to both safety and ballistic consistency. Whether you're using traditional jacketed soft-point bullets or experimenting with cast lead projectiles, this die's versatile collet design adapts effortlessly.

Maintaining Your Lee Factory Crimp Die for Lifelong Performance

Like any precision reloading tool, your Lee 90904 Factory Crimp Die will benefit from proper care and maintenance. A few simple steps can ensure its longevity and continued peak performance:

• Regular Cleaning: After each reloading session, especially if using lubricants or powder that leaves residue, wipe down the die with a clean cloth. Occasionally, you can disassemble the die (if applicable) and clean the interior with a suitable solvent, ensuring no powder or brass shavings accumulate in the collet mechanism.
• Light Lubrication: A very thin film of oil on the exterior of the die and a tiny drop on the collet segments (if accessible) can prevent rust and ensure smooth operation. Avoid excessive lubrication that could transfer to your cases or bullets.
• Proper Storage: Store your die in its original box or a dedicated die storage box in a dry environment to prevent corrosion. Keeping it free from dust and debris is also important.

Why Choose Lee Precision for Your Reloading Needs?

Lee Precision has been a cornerstone of the reloading community for decades, renowned for its innovative designs, robust engineering, and commitment to providing high-quality, affordable reloading equipment. The Lee Factory Crimp Die itself is a testament to their ingenuity, having revolutionized the way reloaders approach crimping rifle ammunition. When you choose a Lee Precision product, you're investing in:

• Innovation: Lee consistently introduces clever solutions that simplify reloading while enhancing safety and performance.
• Quality: Their dies are known for their durability and precise machining, designed to deliver consistent results over countless reloading sessions.
• Value: Lee Precision offers exceptional performance at a price point that makes high-quality reloading accessible to everyone.
• Reliability: Millions of reloaders worldwide trust Lee products for their consistent and dependable operation.

In conclusion, for any serious reloader of .356 Winchester or .358 Winchester cartridges, the Lee 90904 Factory Crimp Rifle Die is an essential upgrade. It directly addresses critical concerns like bullet setback, inconsistent ignition, and feeding issues, transforming your handloads into factory-like ammunition with enhanced safety, superior accuracy, and unwavering reliability. This die doesn't just crimp; it optimizes your ammunition for peak performance in your rifle, session after session.

This exceptional reloading tool, along with a comprehensive selection of other Lee Precision products and all your reloading necessities, is readily available at DEGuns. Invest in precision, invest in safety, and elevate your reloading experience today.

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Product Specifications

Feature	Detail
Product Name	Lee Factory Crimp Rifle Die
Lee Part Number	90904
Die Type	Collet Style Factory Crimp Die

Cartridge Compatibility

Cartridge	Specific Suitability
.356 Winchester	Excellent for Lever-Action Rifles
.358 Winchester	Ideal for Short-Action Rifle Loads
Bullet Types	Jacket, Cast (no cannelure required)

UPC Information

Product Name	UPC
Lee 90904 Factory Crimp Rifle Die	734307909048