Gundigest,
I have used nothing but neck sizing dies for the last 20 years or so. In that time I have discarded a few shells but it has been less than 50. I found that my old 03A3 was good with factory rounds and full lenth resized cases and would shoot about 1.25 to 1.5 inch groups at 100 yards. I tried everything to get the groups down but it didn't happen until I learned a little secret. I began to lose cases with neck and case splits - that means they were being worked too much so I made a bit of a change. I started neck sizing and my groups actually got worse! I had to work the loads back up to get the improvement that I expected. I had to use more powder because the case volume was greater than it had been with full length sizing. Accuracy improved - a bit - I could group 1 to 1.25 inch groups at 100 yards. In a conversation with my smith he mentioned that a lot of the old surplus guns had a "generous" throat and that was about all you could expect from them without rechambering. So I did a little study and found a cheeper thing to try. I only sized the first 2/3 of the neck and left the rest to help center the front of the cartridge in the throat. It now routinely shoots groups of 5/8 inch and my cases last through more firings than I care to think about. I keep the pressures low and the velocities are below maximums too but I have enough velocity to shoot to within one inch of the point of aim out to 200 yards so I am happy.

PaulS