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Please answer this

NoahbodyImportant

Silver $$ Contributor
Is this normal or is this a sign of a worn throat?

I have once fired LC 69 Match brass (.308) it measures .343 at the top of the neck.

I neck size the brass using .336 TiN bushing and it now measures .333

With a 155gr (2156) Palma bullet seated measures .333

Now fired measures .343

Expanding .010, is that normal or excessive?
Am I using the wrong size neck bushing?

Am I ok, or is the throat worn out?

Much Appreciated.
 
Every chamber print I have seen has the throat forward of the lead/freebore area,which is beyond the end of the neck area of the chamber. The throat may have a problem, but it would not affect the diameter of a fired casing.

More questions than answers--bolt or semi-auto, factory or custom chamber?
 
Wouldn't the neck dia. of a fired case be more of an indicator of the chambers neck than the throat condition. The .336 bushing and the .333 sized dimension of brass does not add up to me.
 
From a number of reamer prints that I have .338 is considered a tight neck, "match" could still be as large as .342, and SAAMI is .344.
 
jsn said:
Every chamber print I have seen has the throat forward of the lead/freebore area,which is beyond the end of the neck area of the chamber. The throat may have a problem, but it would not affect the diameter of a fired casing.

More questions than answers--bolt or semi-auto, factory or custom chamber?

bolt action, Parker Hale 1200TX chambered 7.62x51 NATO
 

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