One of the worst things I don't do right is neck tension and case tension of straight walled cases. There's also videos I've watched about expanding such cases and this is one that's a bit of difficulty. That is adjusting for minimal brass working and such. Then there's these terms like "bumping a shoulder" and it seems some chambers are not within spec. Lots of issues that can come up and some terms are difficult to find in print. Fact is some terms are actually not correct yet widely used so that's an added bunch of jargon
It's good to be aware of the array of issues and topics for various rounds
or applications. But don't let that stuff confuse the issue.
Focus on what you are working with.
Consider the old guys, 100 years ago,loading their ammo with an
Ideal Nutcracker and powder dippers.
Case neck tension issues,
1) I.D. of your die,
2) Case neck thickness
3) Bullet O.D.
If it's a consistent problem, any of the 3 can cause/fix it.
(But the bullet needs to fit your barrel,
so don't create a problem fixing one if possible.)
If it's a case by case thing?
It's probably a case thing. (Sizing dies aren't going to change what they
do by much.)
Do you anneal?
