Originally Posted by sendero72
I have the Forster Bench Rest Ultra Micrometer Seater Die for my 7 mm rem mag. I use 162 gr A-max. I realize that bullets will vary some measuring from the ogive, but too many times when I go to seat the bullet, the die will not move the bullet at all. Say I want to move the bullet .005 to get to the correct depth. I dial the micrometer and it doesn't seat the bullet the .005 nor does it move the bullet period. I adjust the micrometer again say .003 and then it may seat the bullet .008. Does this mean that I have a bad spring or what?
don't think I'm nuts!
There will be a certain amount of backlash built into the micrometer head on any of them (all brands), so you must take the backlash out of the adjustment before making the move to the desired number. You seat a bullet, and want to come out three thousandths more, then you should move the head back about ten thousandths and then go to the desired number.
Now there was a comment about compressed loads. I can well see this, but have never had that problem. How much bullet grip have you built into the neck? Also check the seater head to make sure it is secure. Refering to the spring; I doubt it, but you might make a.007" shim and put it under the spring on one end. If it helps then maybe your onto something.