I had to discard a bunch of my Winchester brass. I found many of my 2x, 3x & 4x fired cases were showing a bright(ish) line near the head which, when checked out using the bent paper clip method, turned out to be case heads ready to come apart. In fact, two cracked open in the sizing die. I didn't want to take any chances so.... In the can they went

In the mean time, I finally broke open the 'ol wallet and bought 100 new Remington .270 win. cases.

Question for "those in the know" - After checking all sizes & dimensions, are they OK to load up & use? Or, is it safer / better to run them through the FS die and size 'em up?
I chambered a few with & without a piece of very thin scotch tape on the head & my headspace dimension appears to be OK. (tape thickness = .002" +or-)
What say ye of vast knowledge of the Savage Thunder Stick?