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this is what i do when rebarreling. its specialized work rebarreling a rifle correctly, althought many guys wing it and get the job done.
on the 98 mauser and those related to it there are two shoulders. inner/outer or primary and secondary. the inner/primary shoulder is the very end of the threaded end of the barrel. the outer/secondary shoulder is the one next to the threads and along the body of the barrel.

idealy you messure the shoulders in the receiver and then lathe turn their distances into the barrels shoulder. make the barrel a mirror of the reciever. (something that can help but is not needed .001 short on the outer/secondary shoulder gives firm tenson on both mating shoulders. the outer shoulder of the reciever tends to crush a bit, the .001 just distributes force onto both shoulders i think a little better than perfectly equal does.)

i strongly sujest not using a dial caliper. if you use a dial caliper make sure the butt end parts are true and square, then you have to keep the thing square while taking readings.

if you do this yourself you will need a deapthmicrometer, lathe and knowledge on how to use them. then make the barrel mirror the receiver. BUT your still left with headspacing! i hope your planing on reaming the chamber, if not it adds another layer of difficulty to turning the shoulders correctly on your barrel. i am not going to go into that process since it will get both yours and my head spining...'

SAC22PPC