Just a little bump on the shoulder is all you need. Use your rifle as a gage, back the size die out from shell holder contact about a quarter turn and size a case. Try to chamber it. It probably won't chamber easily. (if it does back the die out another quarter turn and try again with another case). Assuming it is too tight, turn the die down another 1/16 turn and try chambering again. Keep this up until the case chambers easily and then back the die out 1/32 th of a turn and try it with another case. Continue back and forth, with fresh cases, until you get the fit you want. Lock the die ring to allow you to return to this precise setting easily. Then make measurements and document them. Do this procedure in very small increments so that you don't crush the case.
Good luck and I hope this helps; should be about a 10-15min procedure; no pain involved, I promise !
What are you gonna do, talk the alien to death? -- (on Sigourney Weaver's worry about Guns in Aliens)
"Safety is something that happens between your ears, not something you hold in your hands."
"I carry a small gun to compensate for my huge Blue press."