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Headspace Gauges Kit

 
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  #8  
Old 05-29-2010, 10:38 AM
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Re: Headspace Gauges Kit

I've been working with the .22-250AI cases and the measurement I get when measuring unsized, fired brass is 1.5885". If I back the Hornady die off a quarter turn as suggested in the manual, the resized case ends up 1.5885", same as unsized, fired brass. This brass fits the chamber without any resistance. I guess this tells me I am not bumping the shoulder back. However, I expected feel resistance when closing the bolt. Any suggestions?
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Old 05-29-2010, 01:33 PM
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Re: Headspace Gauges Kit

How many times have you fired the cases. It takes 3 or 4 firings most times before the case shoulder has expanded to hit the chamber shoulder. For instance these are measurements on my 30-06 cases and are pretty typical

new cases - 2.040"
once fired - 2.0485" (neck size only)
twice fired - 2.050" (neck size only)
3 times fried - 2.051" (slight crush fit, neck size only)
4 times fired - 2.0515" (crush fit)

then I push the shoulder back with a body die. For each subsequent firing after that I neck size with the Lee Collet and set the shoulder back to 2.051".

So if you are sizing once or twice fired cases your cases may not have fully expanded yet.
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  #10  
Old 05-29-2010, 02:17 PM
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Re: Headspace Gauges Kit

Thanks for the quick reply, woods. I believe the brass has been fired three times. Maybe a time or two more before I need to worry about bumping the shoulder?
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  #11  
Old 05-29-2010, 03:14 PM
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Re: Headspace Gauges Kit

It is harder to feel the crush fit in the smaller cases like the 22-250. The bolt kinda overpowers the smaller cases.

If you start sizing the case body it SHOULD push the shoulder forward a little, sorta like squeezing a balloon. If you have a tight chamber and a loose die then that effect may be minimal.
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  #12  
Old 05-29-2010, 08:02 PM
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Re: Headspace Gauges Kit

"resized case ends up 1.5885", same as unsized, fired brass. This brass fits the chamber without any resistance. I guess this tells me I am not bumping the shoulder back. "

The gage is indeed assuring you that the shoulders aren't being pushed back.

Mr. Woods is correct, it's an FL sizer squezing the case body that pushes a shoulder forward, not the firing; that's part of what your gage is telling you. A neck die isn't supposed to touch the case body.
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