Re: 300 winchester case head seperation ???
The belt is a small factor but any bottle nose case is suseptible to head seperations if you bump the shoulder back too far. On belted cases I prefer to neck size so as to headspace off the shoulder rather than the belt. Then belted cases last as long as any other cases.
Did the copper brush pul the case remains out for you? A 45 cal pistol brush will work sometimes too. Just push it in from the breach end and then pull.
Build a man a fire and you heat him for a day.
Set him on fire and you heat him for life.
Only accurate rifles are interesting.
Gordy and Brady.