Dies will interchange. Doubt you can crimp 308 with the 06 die. The base of the die gets compressed by the shell holder to make the crimp. They are cheap enough to get the right one. You really dont need to crimp unless your shooting an autoloader. I dont crimp my 180 grain 300 mag loads and never had an issue. Unless the bullet has a cannelure it's only going to deform the bullet.

I do crimp my AR mil-spec knock offs and plinking loads

The scale should be fine. Be sure to get a trickler too. Hornady makes a nice scale too for around that price. used to sell a package with a trickler and a funnel along with it if memory serves me correct.