Quote:

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By not measureable, I meant by us amateurs.

I am sure if you had scientific instruments or lasers,
then yes, you could measure both the internal and external
dimensions.

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You might be right as to requiring very fine instruments.

I really have no idea what instruments might be needed. As we all know, damage caused by hard bullets is described as ranging from faint shadows of pressed out rifling all the way to spitting of rifling out the muzzle, ribs falling off, etc.

Some of the latter would, I think...be measurable with a ruler and weighed by the pound...

But no pictures of the latter types of damage have been posted here, either.