Best Handloading Technique . . . . it's simple too.
CASE WIDTH . . . .
All non-belted rifle cases fully expand to chamber diameter, and that leaves a visible change in case diameter. It makes very little difference where your brass comes from if you can resize it accurately. This requires measuring case to chamber clearance (above the web) with an ordinary set of calipers, using the wide part of the blades. (1)Zero your calipers just above the web on one of your fired cases. (2) Then measure your handloads in the same way. Your calipers will display the exact chamber clearance that YOUR handloads have in YOUR chamber.
CASE LENGTH . . . .
Most shooters don't measure their "shoulder to chamber" clearance either. When doing this, you ALSO need to know the actual size of YOUR particular chamber. Otherwise you are comparing handloads to something that may not accurately represent YOUR particular chamber. That is the main advantage of the Digital Headspace Gauge. It can also measure your bullet to rifling jump within a thousandth of an inch, and it works on ALL different calibers without any attachments.