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Reloading Berger Bullets


Question on brass prep

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Unread 05-07-2007, 02:49 AM
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Re: Question on brass prep


However, if after extreme accuracy some guys will use machinest pin guages to accurately measure the neck tension on each piece of brass before and after sizing to control neck tension.


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BH, could you expound on machinist pin gauges and possibly give a link. I haven't heard of that before.

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Unread 05-07-2007, 03:06 PM
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Location: Wilmington NC
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Re: Question on brass prep

Brass will size and then slightly expand after resizing depending on hardness. How much it expands back is the issue.

You can go to any machinest supply website and buy what are called pin guages in .001 dimensions (on the + or - side of the even decimal). With 3-4 guages and the tool holder it is easy to accurate measure the inside of the you neck (just exactly how big is that hole) to the .001.

It is not uncommon to use one bushing and have brass that might have a hole of .002 difference. Obviously that will cause different neck tension when seating.

This is easiest felt if you are using an arbor press to seat your bullets. K&M sells a dial indicator attachment for their press to accurately measure the seating force of each individual bullet.

Obviously this is not needed for hunting rounds.

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