.17 Mach IV


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Dave R
December 29, 2002, 12:09 PM
I lost a close friend recently. His family gifted me one of his rifles. Its a .17 based on .357 mag pistol brass.

I had a chance to visit my departed friend's house today to look for dies and load data.

Sadly, he was not very organized. I found no load data. But I did find 2 dies. They were from RCBS, and they were labeled for .17 Mach IV. So that must be what its called.

There was a single forming die (there must be more of 'em somewhere) and a trimming die. So here are some questions:

1) Anyone know what the complete set of dies should include? I'm guessing:
-Several forming dies to neck the .357 case down to .17.
-A neck reamer
-A full-case sizing die?
-The trimming die which I have.
-Any others?

2) Anyone know where I can get load data for this? Is it in the commercial catalogs?

3) Does anyone list the dies in their catalog, so I can purchase any dies I can't find? Even though the dies I found were RCBS, I couldn't find any mantion of .17 Mach IV on the RCBS website.

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Steven Mace
December 29, 2002, 05:32 PM
Dave, as has been posted in another thread the .17 Mach IV is based on the .221 Fireball case not the .357 Mag. case. At this point I would recommend contacting to people at Huntingtons (http://www.huntingtons.com) to see if they're aware of such a wildcat caliber. They specialize in custom caliber reloading equipment. Hope this helps!

Steve Mace

Dave R
December 29, 2002, 09:30 PM
Thanks for setting me straight. The Mach IV die must've been a red herring. I thouht maybe it could be used, but the formed brass won't even fit in it.

Oh, well.

redneck2
January 3, 2003, 06:28 AM
there was an article in Handloader maybe a year ago that talked about some of the various .17's

http://www.saubier.com has a small caliber forum

before you get too deep, you may want to make sure exactly what you have. Probably have to do a chamber casting. Need to find out from someone with more experience than me.

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