Description

The Hornady Custom Grade 300 AAC Blackout / 300 Whisper Full Length 2-Die Set (546349) is a precision-machined reloading die set built for handloaders who load one of the most versatile short-range and suppressor-optimized rifle cartridges available for the AR-15 platform. This full length 2-die reloading set for 300 Blackout is a practical choice for AR-15 owners, home defense shooters, hunters, and suppressor users who want consistent, reliable ammunition built to their exact specifications.

Key Features

Manufacturer part number: 546349

Caliber: 300 AAC Blackout / 300 Whisper (7.62x35mm, .308 diameter)

Die Series: Series I

Die set includes: one full-length sizing die and one In-line Bullet Seating Die

Full-length sizing die sizes cases to SAAMI minimum specifications

Zip Spindle with light threads on spindle and spindle collet for positive lock and fast adjustments

Elliptical Expander and hardened Headed Decap Pin included on sizing die

Hand-polished mirror interior finish on sizing die, guaranteed not to scratch brass

In-line Bullet Seating Die with floating alignment sleeve and floating steel seating stem

Built-in roll crimper on seating die

Sure-Loc lock rings with wrench flats included with both dies

Stackable die storage box included

Standard 7/8-14 thread, compatible with all presses that accept standard dies

Shellholder sold separately

Made in the USA

Special Features

The Zip Spindle design positively locks to eliminate spindle slippage and allows fast tool-free incremental adjustments, making it easy to switch between subsonic and supersonic load setups without losing your settings

The Elliptical Expander delivers smoother neck sizing with less friction and reduced case neck stretch than standard ball expanders, which matters for 300 Blackout reloaders who commonly form cases from trimmed 5.56 brass

The In-line Bullet Seating System aligns the bullet, case neck, and seating stem inside a floating sleeve before the bullet enters the case neck, producing consistent seating depth across both heavy subsonic and lighter supersonic bullet weights

The built-in roll crimper on the seating die handles roll crimping without requiring a separate crimp die or giving up an extra station on your press, which keeps semi-auto feeding reliable

Sure-Loc lock rings clamp around the entire die body with constant pressure, keeping the locking screw off the threads to protect both die and ring from contact damage

Hornady guarantees these dies will never break or wear out from normal use

Practical Benefits

The full-length sizing die makes this set ideal for AR-15 platform reloaders who need cases sized to minimum spec for reliable feeding, extraction, and bolt closure on every shot

Handloaders building subsonic loads for suppressed 300 Blackout rifles will find the consistent seating depth this die set produces is essential for reliable cycling and consistent sound signature

Hunters using the 300 Blackout for short-range deer or hog hunting can tailor bullet weight and powder charge to their specific barrel length and application, getting more from the cartridge than factory loads typically offer

Your formed or reformed brass will load more smoothly and last longer with the hand-polished interior finish and Elliptical Expander reducing friction and neck stress on every pass through the sizing die

The Hornady Custom Grade Series I Full Length 2-Die Set (546349) in 300 AAC Blackout / 300 Whisper is a smart addition to any AR-15 handloader’s bench for building consistent, accurate ammunition across the full range of subsonic and supersonic loads this cartridge handles.