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throat/neck tolerance question

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Unread 04-14-2013, 08:49 PM
Silver Member
Join Date: Apr 2009
Location: MD
Posts: 301
throat/neck tolerance question

I've got a 7stw that was custom built by gtr. He requests a dummy round when building the gun. I was a novice to long range shooting and reloading at the time and loaded my dummy round with Remington brass. This yielded a case with a .313 neck and that was what my throat was cut to.

Since that time stw brass has been hard to find so I went about fire forming some from norma 300 h&h brass. I've used a .310 neck bushing when I resized before but noticed today when I was reloading the fire formed brass that I had almost no neck tension because the Norma brass is thinner walled than the Remington.

Based on what I've measured the new wall thickness is .010, x2 is .020, +.284 is .304.

So my question is will having a separation of .009-.010 between the neck/throat hurt or effect anything from what I've been use to with the very tight fit?

Thanks in advance for any advice.
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  •   #2  
    Unread 04-15-2013, 07:07 PM
    Platinum Member
    Join Date: Jan 2005
    Location: OK
    Posts: 2,133
    Re: throat/neck tolerance question

    your accuracy shouldn't suffer with new load development, but brass will work harden quicker so you will need to anneal every 2-3 firings to keep necks from splitting.
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