Nino: My bad,I did not see post 65 till now.Yes,that is the measurement.
The cartridge case drawing calls for .354 over the shoulder.
Your calipers show .3555 to .358.
So,indeed,the length being crushed by over crimping translated to increased shoulde diameter,and a distorted,collapsed shoulder.IMO,the shoulders collapsed in away that made the bullets eccentric,and that's why they scuffed at the chamber throat.
Solving the problem Is simple once its identified.
You have received a lot of advice on adjusting your seating die.Of course,there is also my way.Mr Guffy is fond of feeler gauges.This is similar.
You have a bolt rifle.There is no need to crimp.You need a way to set your seater die to the same, consistent height off the shell holder every time,so your LOA remains consistent once you get it set.
For now,take a piece of your trimmed,sized brass,no bullet,and put it in the shellholder .With the seater die back out from the shellholder a few full turns,run the ram up to the top. Now,screw the die down till you feel the crimp function contact the case. Stop.
Now,look at the gap between your shelholder and your die body.Thats the "crush".Ok. You want to back off "some" . Enough so that crimp won't contact your cases when they grow a bit.Enough is what you need,but more does not help you. a quarter turn is plenty.
Do you suppose you can come up with ...oh,say a flat washer that you could use as a gauge between your shellholder and your die body that is pretty close?Something steel,and parallel?. Keep it in your die box.Use it every time.
Consistent. Now,a little secret. Get a fat cross section O-ring,like 3/32 or 1/8 in,with a 7/8 ID. Put it under your lock ring.
When you set your die against the washer,ram up,put a little bit of load on the die.Then set your O-ring'd lock ring down on the die.
Why? A 60 deg Vee thread is a spirally Vee-block.Your die will want to self center with a little end load.
The O-ring will hold your adjustment,but it will allow your die to center on the thread vee. Without the O-ring,your lock ring will fight with the die for alignment. Let the thread be the master with the o-ring.
You will tend to get straighter ammo from the seating process.
This will settle in better after your brass is fire formed.
Once you have a washer or other setup gauge,you can set your seater stem for LOA.
Then you are locked in for consistent,quick,repeatable setup.