Comments on: Tech Tip: Always Check Headspace with New Barrels https://bulletin.accurateshooter.com/2017/04/tech-tip-always-check-headspace-with-new-barrels/ from AccurateShooter.com Sun, 07 Jun 2026 10:05:48 +0000 hourly 1 https://wordpress.org/?v=4.1.26 By: bill novak https://bulletin.accurateshooter.com/2017/04/tech-tip-always-check-headspace-with-new-barrels/comment-page-1/#comment-1176 Wed, 13 Aug 2008 21:33:09 +0000 http://accurateshooter.wordpress.com/?p=926#comment-1176 I have a swede mauser – 6.5 x55.

I had trouble opening the bolt, after firing mil surp.
ammo, and after getting go/nogo gauges, found the head-space .08 too large.

My real question is, I found after slugging the bore, the micrometer read .255 groove /261 lands.

Is the bore undersize, contributing to the high pressure indications, or do I just need to re-headspace the barrel?

The barrel appears to be new.

Comments?

]]> By: Boyd Allen https://bulletin.accurateshooter.com/2017/04/tech-tip-always-check-headspace-with-new-barrels/comment-page-1/#comment-1175 Sat, 03 May 2008 16:40:54 +0000 http://accurateshooter.wordpress.com/?p=926#comment-1175 Scotch Magic tape is .002 thick by my dial caliper.
If you stick one or more layers to the head of
a new case until you get some feel on bolt close,
you can get a rough idea of what your brass to chamber clearance is. It is usual for chambers to be longer than new brass. The question is how much. You can experiment
on rifles that seem to work properly to get a
feel for what is normal. I am not suggesting that
tape is a substitute for gages, but this is an
easy way to get a rough idea of what you have.
Check the tape that you are using for thickness.

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