The linked page on the midwayusa site reflects the continuing mess that Hornady created when they released the die set with inadequate attention to the instruction sheet.
Midway Page:
Hornady Dies at Midwayusa.
Midwayusa page for product #146834 Hornady 450B dies wrote:Notes:- Seating die features seater adjustment screw, built-in crimper, and locking retainer spring
- The crimp die and is intended for a deep crimp which may be required with heavy cast bullet loads.
- Features Hornady's No-Risk Lifetime Warranty
- Hornady Suggests Spraying all metal parts with Hornady One Shot Gun Cleaner-Degreaser and Dry Lubricant before using the dies (Sold Separately Item# 270-323)
Not only does the statement I've highlighted in red have grammatical problems, it probably should not be taken seriously. With cast bullets, a too-heavy crimp may deform the bullets causing accuracy problems, and if the taper crimp is applied really heavily, it can create ammo that does not headspace properly in the chamber, perhaps dropping too far into the chamber, which can result in overpressure firing.
On the Midway page Immediately below the notes is a section headed "Additional Information". One of the two links there is to "Instructions". The faulty instruction sheet for loading with this die set has generated discussion on this forum for several years.
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If I read the last page of the instructions correctly, the date is 5/05, which is also the date of the sheet Hornady furnished with their first batch of dies from years ago. Hornady has had many moons to get it right, and still has not done so.
The instruction sheet completely ignores the Taper Crimp Die, which can easily bewilder a novice reloader, and even some fairly experienced reloaders who have come to this site in the past.
Even more diabolical, the instruction sheet includes detailed instructions for applying a roll crimp, which is a no-no with the 450B. One wishes Hornady would sell the die set with a seater sleeve made specifically for the 450B cartridge, rather than using the sleeve made for the 460 S&W pistol cartridge. At the least they should put in a supplemental sheet specifically describing procedures for the 450B.
--Bob