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davery25 · January 31, 2013, 11:19 PM

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?

January 31, 2013, 11:19 PM	#1
davery25 Senior Member Join Date: October 4, 2011 Location: Australia Posts: 318	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?