Brass Expansion

[Taylorbok]

The neck diameter on fired brass is 0.268". The brass would have had some spring back from say 0.269". The maximum neck diameter on the chamber spec is 0.267"

The diameter of the brass body by the shoulder on fired brass was 0.267". The drawing of the chamber spec shows a maximum of 0.263".

I think ur looking at the wrong drawing. Even the one you posted shows .277" neck Diameter +.002" tolerance.

It hangs up about .040 from the case body. It'll go in so far, but expansion at the body/ shoulder junction stops it. Therefore there is no way to measure shoulder bump short of resizing long and working back.

I think ur using the wrong comparator. You should be using the .400" comparator. If that won't go over the neck there is big issues.

 

[Taylorbok]

Bushing with mandrel. ID after sizing is .240 giving me .003 neck tension. So, brass thickness is about .013 on the neck.
.240+.013+.013 would give me the .266.

Fired brass will not go into the head space comparator. It is too expanded in the shoulder area. I haven't seen that before either.

What does the neck OD of a loaded piece of ammo measure?