To micrometer bullet seat or not?

Its mostly convenience; but some do load straighter ammo. A lot of them don't. Whether or not straighter ammo will result in a detectable improvement in accuracy is a whole 'nuther thing.

Where you might benefit is from experimenting with COL, changing bullets or using the same dies for multiple rifles. You can do it without a micrometer but it is handy.
 
It's nice to seat a bullet, pull it out of the press, measure it's base-to-ogive length with a comparator (get a comparator if you don't have one - bullet tips / overall length readings are notoriously unreliable), and then just dial in the additional depth required to seat in thou. Gives you much more precise level control over the process.

I also feel that both round-to-round seating depth and overall runout (concentricity) is better with a premium seating die with a micrometer stem.
 
It's great to have when tweaking the seating depth. But, as with any RIFLE seating dies, make sure that seater stem pushing / touching the ogive of the bullet and NOT touching the very tip. Happens with VLD bullets...

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Not having a micrometer seating die (yet), it seems to me that its usefulness would be in the fine, repeatable adjustability of the cartridge length.
BTW, a while ago I measured a bunch (25) of 30-06 rounds I just reloaded, and found the overall length ES was 0.0210 inches, with an SD of 0.0046 inches. The ogive length had an ES of 0.005, with the SD being 0.0011. Measurements were to 0.001 inches, and the tenths are calculated by the spreadsheet.

I don't remember which die set I used to seat the bullets, but I know it wasn't a micrometer adjustable one.

The bottom line: a regular seating die will give you fairly consistent seating depths, but will be trickier to fine-tune the length.
Whether or not more consistent seating depth ammo will matter for my shooting: I doubt it. For your purposes: only you can answer that.
 
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