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Old January 31, 2013, 11:19 PM   #1
Senior Member
Join Date: October 4, 2011
Location: Australia
Posts: 317
K31 7.5x55 FL case sizing issue

Okay, not so much an issue as a query. I usually FL size all my rifle cases and bump the shoulder back 0.002. I use a comparator gauge to measure this.

I did the same with my once-fired 7.5x55 swiss brass except the bolt wouldn't close on it.

bumped the shoulder back to 0.004 and the bolt close but required force.

So now i have the die set up to bump the shoulder back a whopping 0.006 and they chamber fine.

Does anyone know why the shoulders need to be bumped back so much in the k-31?
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