Fired Case Neck Expansion

[Bill616]

I have a Shilen rifle barrel with a .255 Neck. Loaded rounds (22-6MM) in Winchester brass measure .250NK. A fired case measures .253 NK. Should the fired case measure closer to the .255 neck diameter? I believe if I went to Remington 6MM brass (thicker) I would get closer to the .255 number. I chose the .255 NK over the .250 NK barrel as I did not want to neck turn the brass. This is a hunting rifle with a #4 sporter barrel. When fireforming the brass, one load grouped three bullets in .547" at 100 yards. Thank you for your help.

Bill 616

 

[markm87]

I'd expect the brass to spring back a little from the actual neck diameter.

 

[243winxb]

Add in a little for spring back & it looks Ok for a hunting rifle. Some light loads with slow powder may not expand the neck fully. You dont want to tight of a neck fit like here, http://forum.accurateshooter.com/index.php?topic=3788024.new#new Hard bolt lift.

 

[necchi]

Another vote for spring back,
Your good,

 

[Bill616]

I appreciate the replys. Thank you.

 

[fredhorace77]

+1 on spring back