I also use them for .223,260,30/06 and 270 Win. Here's the great thing about the Hornady micro seater. You can buy one micro seater and actually use it on all of your Hornady seating dies. No need to buy multiple micro seaters for every caliber, you can use one for all. The way the seater is designed, it has a generic seating stem that contacts the top of the seating plug of the seating die. What I do is have notes in the die box to record the micro numbers to whatever bullet and COL you have for that caliber.
The micro seater unscrews easily from the seating die and can be moved from die to die. I didn't know this about the micro seater and bought three separate seaters for the four listed calibers. It wasn't until I decided to use the micro seater from my 223 seating die onto the 260 seating die and discovered they can be moved from die to die. Just keep a log/notes for the seating stem numbers and COL's for your different bullets/ calibers and the seating readings are repeatable when going back and forth from seating die to seating die, just as long as you don't change /adjust the die ring from when you initially set the seating die up. I set all of my Hornady seating dies up exactly as the factory instructions instruct. There is some wiggle room and I set each die up to where the micro seating stem numbers face forward.
You can actually set your pre determined seating settings with the micro stem off of the die and just screw the stem into the top of the die after setting your number.
As far as crimping, you set the die to crimp or not crimp in the initial set up. I don't use the crimping feature on my seating dies. If I feel the need to crimp, I use Lee factory crimp dies.
The Hornady micro seater is a good value and it works well.
