REDDING 17 MACH IV FROM 221 REMINGTON FORM #1 *CUSTOM

REDDING 17 MACH IV FROM 221 REMINGTON FORM #1 *CUSTOM
Item #:RED90504
Price:$108.99
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Availability:Only 1 in stock
MPN:90504
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Product Information

Case forming dies are designed to change the shape of the original parent case in small increments to avoid overworking the brass and to prolong case life. After using the proper form dies and/or Form & Trim Die, full length sizing is required.

Read 1 Reviews - Average Rating: 5 stars

Making 17 Mach IV Brass

By Michael T. on Jun 11, 2019
I first convert .223 or .222 brass to .221 Fireball with the Redding die for that conversion, followed by length trimming and the .221 FB sizing die. At this point, I do a partial neck thickness reduction by turning. Then you need the #1 Form die from Redding to partially reduce the .221 brass, and finally the 17 Mach IV sizing die and a final neck turning to around .012" or so. The Redding dies work very well, but as you can see, it is a bit of work. I have been able to start with used .223 brass, Remington brand, others should work. The work hardened original shoulder and neck are trimmed off, so old brass seems to work well. Carefully watch the cartridge headspace length. I measure it at 1.083" with a .330 Hornady gage, 1.088" after firing. Redding dies!
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