I'm a new reloader so please bare with me and enlighten me.

The lands on my rifle are at 2.210 ogive and to sit back off of them I like 2.116 ogive.

My question is, with sshorter bullets it doesn't sit very deep in the case. How much of the back of the bullet should be in the case? Or is it not practical to be able to seat at that length all of the time?