For getting prepped for the next range day, I will mostly be noting velocities for some test load. Other than that, I want to shoot 100 yards for bolt gun and 50 and 100 yards for rimfire. What is the system for targets these days? Are there stands or racks set? Or have to bring own stand and frame and set them at appropriate distances?
I don't recall the last time I shot at KR3 or KR4.
you should be totally self-sufficient. I recommend you bring your own target frame, stand, and means of anchoring to the ground (8" - 10" tent stakes work good).
if you're shooting semi-auto, you really, really need to be using a brass-catcher or a tarp, especially with 22LR, because you are responsible for policing your brass, and sometimes your shooting position is in tall grass. When we're done for the day, the Army inspects the range to make sure it's clean, and we're accountable for that, even if it wasn't when we signed it out.
If you're putting out a paper target at KR3, it's at 100yds. I sent you a PM with some amplifying info.
At KR4, you can put out (multiple) targets near and afar and in-between, e.g. CCW style, but you're limited to the fence line, appx 80yds, for max target distance. From certain KR4 shooting positions you can see the top of a rusty old tank turret at about 380 yds.

sounds to me that if you want to shoot 50yds and 100yds, you might have to split that between the two ranges, sorry.
I recommend you bring a folding table and chair, or a shooting mat. and sun-screen. As @Ren pointed out, there is no shade and no AC, and we've brought this to the attention of mgmt. They've assured us they have
Top Men, yes,
Top Men working on it.

However, there is shade at KR4, and after 11am, you'll find all the old-timers congregated under the trees, talk story for hours. It's a regular "social hour" down there, all quiet on the range, though. There's some funny stories ...
previously posted pic of KR4, mental refresher:

