Agree with wncchester, my trim length is 1.755, and I'll accept any case between 1.750 and 1.760. Or in other words, my target length is 1.755 and I'll accept a +/- 0.005. I do not load for absolute precision though.
I think if you're loading for precision, then every factor counts to some level. So a consistent case neck would one of those factors, and if you use a crimp, and I'm pretty sure you do, then that consistent neck length should hit the die at the same spot every time.
If not loading for serious precision, then I wouldn't worry about it.
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