Here's how I do it.
Deprime the fired cases.
Anneal them
Size them
trim them
One of the purposes of annealing is to get the neck/shoulder to consistent "softness" so that you get uniform base to shoulder dimensions when sizing. Once that is achieved, you can trim them to uniform length. If you trim them first, due to differential "springback", after sizing the annealed cases you'll put length variability right back into them. At least that's my theory (I've proved it to my satisfaction with WSM cases) YMMV......
That didn't read well... here's an explanation
(On WSM cases that need annealing, after sizing I can get as much at 1.5-2 thou headspace variabiity case to case - the "stiff" ones just don't size well, but the "soft" ones size OK - after annealing they are all w/i half a thousandth - If I trimmed first, that length variability would show up in the cases - some with long necks and some with short, which affects bullet release which is a function of neck tension and bearing surface contact along the length of the neck)
Elkbane
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