I have a basic reloading set up and limited knowledge on the more intricate details of rifle reloading. How important is it to add a chronograph? They're not overly expensive, but also not cheap. Just wondering how far down the list it would be compared to spending some extra time and $ shooting, and figuring out the ballistics with paper and a calculator.
The folks above are giving you some very valid points.
But, as todbartel so aptly put it, numbers don't lie.
I went for a few decades avoiding getting some sort of device for measuring velocities. Back in the day, when I first started, measuring velocity reliably and consistently, involved setting up screens to shoot through at different distances, which were all hardwired to a console, that read numbers, to be extrapolated.
If you're only loading for a couple of firearms, Chrony systems can now be found online, used, of course, for under $100. The readings will vary depending on light conditions, but they will give information that is reliable on the day you're shooting. The Chrony will indicate whether ignition is consistent, or your "thrown" charges are consistent, by the velocity readings.
The reading will be "close enough" for the average needs of most reloaders.
A chronograph will indicate the dangerous ranges of velocities, from too low to too high. Both can give you extreme pressure issues.
If you're loading within tolerances, the chronograph will indicate consistent velocities, so you can adjust loads for the harmonics generated in your barrel, so you can duplicate the "sweet spot" with the same components.
It will also show you the difference between powders that are close in burn rates, and different primers.
If you're into extreme accuracy, then you need to go to something better. Again, it doesn't have to be perfect or the most expensive, unless you're anal, like tod ;-).
I now use the Garmin Xero C1. It's a mid range price, but it's one of the best out there, and it will fit into your pocket.