I wanted to do a little test after a was reading a thread on annealing on another forum, one guy suggested that adding lube to freshly cleaned and annealed brass would only cause inconsistencies and promote bullet setback under recoil. I loaded up 6 rounds of 30/375 S.I. ammo for the test, three had hornady one shot sprayed in the case necks before sizing without the expander ball, and three did not, i chose a load i already knew how it shot with the lubed necks. Here is a pick of a three shot group of the load i chose two days before this test.
And here are the bullets after seating, unlubed on the left, lubed on the right, notice how much the seating stem pushed in the jacket of the 210 nosler ALR. Seating force was also easily triple the amount needed on the unlubed necks as the force needed on the lubed ones.
I shot them at 100 yards, before i shot the first group with the unlubed necks, i fired 1 round to get the barrel warm, the barrel wasnt cleaned from the 45 rounds that were out down the barrel over the last week before this test. Here is the group with the unlubed necks.
And the group with the lubed necks.
Now i didnt have a chrono to compare velocities and ES, but all the vertical of the unlubed necks compared to the very little with the lubed necks suggest to me that putting some type of neck lube will help my groups and out rounds on target.