Turning necks question

[Lefty Trigger]

I have a batch of 6XC brass that I skimmed the necks just to clean them and while reloading them I'm finding a few with really tight necks. All are new never fired, I lubed and resized them all, run them over my neck mandrel and skim turned them. Loading 25 yesterday I found 3 that took excessive force to seat bullets.
I have also come across this with my 22BR brass.

 

[dnellans]

Are you measuring them with a ball mic when turning to be sure they all measure the same when you’re done?

Are you turning all the way into the shoulder to make sure any doughnut at neck/shoulder junction is cut out as much as possible?

Are you sure your lube when seating is consistent?

If it’s only 3/100 - my guess is you missed a step in your process getting distracted somehow

 

[SSL]

I think you are OK. By sizing first (correctly) you introduce inside neck dimensions with the thicker neck, even with spring-back. The inside dimensions won't change until the cartridge is fired. Even the mandrel may not be quite enough to prevent a little spring-back (inward this time) if the neck is a bit thick and end up a little tight for the bullet. Once fired, the sizer will then compress the neck less due to the removed outside material and your problem should go away. Those three probably had slightly thicker necks than the rest and compressed more in the sizing process. I've run across this before with virgin cases. With these being new, unfired cases, there is no donut to deal with.

 

[6BRA]

fireform and then anneal every time.

 

[Lefty Trigger]

I think you are OK. By sizing first (correctly) you introduce inside neck dimensions with the thicker neck, even with spring-back. The inside dimensions won't change until the cartridge is fired. Even the mandrel may not be quite enough to prevent a little spring-back (inward this time) if the neck is a bit thick and end up a little tight for the bullet. Once fired, the sizer will then compress the neck less due to the removed outside material and your problem should go away. Those three probably had slightly thicker necks than the rest and compressed more in the sizing process. I've run across this before with virgin cases. With these being new, unfired cases, there is no donut to deal with.

Thanks, I went ahead and loaded them and marked them for foulers. New rifle so working on load development and not looking for issues thrown into the mix like obscure neck tension.