Hello everyone. Question on brass life. I have a bunch of federal cases, about 200 saved up for my 300 win mag. I had one split at the head on me on only the third firing. I am shooting loads that are close to max for this rifle. So having had one split I've started checking my brass closer with the good old paper clip method and after the second firng I have had to cut about 10% of my cases. So what could be causing this? My primary thought is that its just the cheep federal brass but I want to make sure it isn't some issue with my resizing technique (full length RCBS) or with my rifles chamber. Any help would be great!