yes i can imagine that a fire formed cases would be tight fitting.so in other words,full length sizeing is the way to go for hunting loads.i'm a stickler for accuacy but i'm just trying to figure out what worth doing and whats a waste of time.human error is a big factor during hunting situations,but i want my rifle to be very accurate.that way if(or when)i do miss i know it was all me and not the rifle.