As a novice at reloading (all the gear and no idea) I'm curious as to how you measure the seating depth on a given round. I have a suggested load which I am told should be set 10 thou' off the lands. I know why this needs to be done the question is how do I determin how far off the lands I am. I haven't as yet loaded any of my own as I firmly believe in reseaching what I'm doing before blowing myself up. Father Christmas is bringing me a reloading manual but dispite the hints and suggestions I'm not allowed to have it before then. So couold someone please satisfy my curiosity before impatiance gets the better of me. I have considered measuring a factory round as they should in theory be set off the lands. Also the information that came with the loading dies (Lee) does give some suggestions of overall length, but this doesn't reall tell me what distance the bullet is from the lands.