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30 Gibbs case forming

 
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  #8  
Old 01-07-2011, 06:32 PM
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Re: 30 Gibbs case forming

Woods....I use .270 or .280 brass to form my .300 Sherman cases which are very close to the Gibbs only less body taper, sharper shoulder, and longer neck. If you open the neck up to say, .338, then partial size back to .308 just enough so that you leave a false shoulder, you don't have to mess with loading bullets. You can load 11 grs. of red dot, cream of wheat to base of neck and a little cotton to hold it all together (fire away). I have even formed them by simply sizing directly to .308 and using the same load to fireform with no stretching at the web. I believe , because of the longer .270/.280 case, the neck of the case binds at the start of the throat and acts to headspace just like a false shoulder would. I don't know if this would work in every case, but it works great in my chamber which measures 2.515". You might experiment with this a little. At worst, you might have to trim the case length slightly before you fireform, but it is a lot easier than going thru all the sizing etc. Also, you aren't going to end up with too short necks. If you REALLY want to make life easy, do what I do currently; order a hydro die from Lonnie Hummel of Hornady and all your troubles are over.......Good luck/Rich
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  #9  
Old 01-08-2011, 12:35 AM
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Re: 30 Gibbs case forming

I have a full set of hornady generic neck sizing dies. They will neck size any cartridge. I use the 338 neck sizer the bring it down to 30. Go a little at a time until you get that false shoulder headspace then lock in the die.
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