Thread: Using comparator tool when seating projectiles.

I fiddle with the micrometer seater till the CBTO is what I want then leave it there and load al my rounds. Fortunately I only use one cartridge so can just leave it there. I measure the loaded CBTO with achornady comparator body and bullet insert. A hex nut ith holes the size of bullets was a bit unstable and wobbly.

If I change the micrometer setting say for a different bullet I write it down then can dial it back to where it was and its pretty good. Its a Redding micro seater I use and you can re zero the dial so mine is set to a

I havent been able to accurately measure my distance to lands so am not worried about getting a particular CBTO, get it the same each time. My lands seem to be > 0.100” further out than the max length I can fit in mag and eject through the action if unfired. So I might not be fussy enough for your purposes.

Handy facts Ive found with my system (7mm NBT 140gr):
The OAL to tip is actually very consisyent ie +/ - 0.002” so my bullets are consistent from “ogive” to tip.
Compressed powder loads result in the bullet being pushed back out a few thou so would be hard to get consistent seating
I apply Imperial dry neck lube inside the case neck sing a brush on a stand tool I got from Reloading direct ( for severa years just screwed an old nylon brush into a bit of wood fixed inside a plastic jar to hold all the black lube tidy. I dont use the white silica powder libe as i think silica is very hard but graphite is softe. My fingers get black ue to case lube and neck lube.