110 bolt internal thread dimensions

[nso123]

I bought a used 110 action, and the internal threads on the bolt (for the BAS) are a little rough. I want to chase them but want to verify the thread pitch first i am thinking 1/2-28. Can anyone verify this for me?

[drybean]

you are correct, be careful they are very hard

[bootsmcguire]

you are correct, be careful they are very hard

Sometimes harder than the tap you are chasing with.