Lapua case necks too thick for my rifle

[Mikecr]

If your barrel was chambered as tight neck, that is usually engraved on the barrel.
Like "260Rem (.290 neck)"

After firing the factory ammo, what do those unsized necks measure?
What do loaded necks with your unturned Lapua brass measure?

 

[lancetkenyon]

I know all that. What I must have dilly danced about was, does Lapua make .284 brass thinner than 30 cal brass?

Not that I am aware of. If you want thinner, get .260 Rem brass and neck UP.

 

[MagnumManiac]

My 260AI is a custom reamer 'no-turn neck', but my own Lapua brass requires turning to fit comfortably. If I don't turn, clearance is less than .002" by a couple tenths. I measured with Remington brass…
If you ever want thinner brass in the necks, neck smaller brass up, I do this with several of my custom cartridges to avoid turning necks, .003" chamber clearance is absolute minimum and should never be less than .002".

Cheers.