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Old March 16, 2013, 09:01 AM   #30
243winxb
Senior Member
 
Join Date: July 26, 2011
Location: USA
Posts: 1,730
Do your own Testing- Savage & Remington Bolt Actions -

My testing shows the shoulder is not needed in some rifles for the firing pin to set off the primer. Case head is held by the extractor. My testing also shows the shoulder may be set back as much as .006" from the firing pin strike ( if shoulder makes contact with the chamber).This requires a loose fitting extractor & maximum head to datum brass. The ejector keeps the brass in contact with the extractor. My testing shows the head to datum measurement may get shorter on firing. My testing also shows 1/2 sizing of the neck will produce smaller groups when using FL sizing bushing dies. The unsized* part of the neck fully expands to the chamber in 3 or more firings, even in a factory chamber. People that think they know it all, may not know a thing. This may include me.

Last edited by 243winxb; March 16, 2013 at 01:14 PM. Reason: sized* spelling
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