How is bearing surface length measured for boatail bullets?

[TonyR]

Same here...

Bill

Interesting that a "bell curve" isn't readily apparent.

A bell curve is more obvious with custom bullets that tend to come out of the press sequentially. Production bullets usually exhibit kind of double overlapping bell curve because they may be from different batches of the same lot number but somehow mixed together in the production process. I have seen this with brass as well.