Gosh, such a long winded thread.
1. When starting FLS and particularly if you have mixed brass and also several rifles of the same cal always check for case chamber fit after sizing before going full hog to loaded cartridges.
Beware of pushing of pushing the shoulder back too far.
2. These issues can be found very quickly by simple measurement using your trusty vernier calipers (all handloaders have a caliper don't they?) and the Hornady Headspace Gauges.
The only time I had cases that I had correctly sized the shoulders for my rifle not fit was brass given to me. I ended up having to borrow a tight base die.
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