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Martin Taylor

Hornady do offer a service to help fix this elevating any confusion & minimizing measurement error. You send 2x fire formed cases and they will machine the case with the thread to accept the comparator tool!

First job for me on a new rifle that is being set up for target/LR work is to fire off 5 rounds then drill and tap (hopefully only one!) to suit my comparator, keeping the others to set minimum shoulder bump on the dies.

Worth mentioning for new reloaders that these measurements are not "set for life" as stated, for example throats wear & to a smaller degree (hopefully) lugs lap/bed in. Just as all projectiles out of a batch/box may not measure up the same.
Nathans reloading book is still my go to for a clear understanding of all these things.