I have been reloading for many years now and have developed what works for me, but I found something that I wanted to see if any one else has seen this. A friend of mine was having accuracy problems w/ a G A Precision rebareled 40xb. He is new to handloading and after several attempts he asked me to help. He gave me 100 peices of firred, prepped and primed lapua brass to work up a load for him. The brass was Lapua and the primers were 210gm, I knew he necksized the brass but I dont know what else he did. I could tell he had not champhered the mouths, but I decided to use the brass as to find out where the prob was. I measured the brass and found it was like all the thousands of peices of lapua .308 brass I have worked with before (very uniform). I loaded the 1st 50 pices and found when seating the rounds in the wilson seater (same he uses) the bullets went in the mouth hard (from what Im usedto)I didnot have his sizing die to check so I calculated the neck tension by measuring the brass and came up with about .0045-.005 in. I inspected the run out and it was good and no copper had been shaved from the bullets. I could not get any consistancy from these loads (unexplained flyers and in general poor accuracy). I loaded the 2nd 50 rounds and champhered the mouths this time and changed other aspects of the load, I had about the same results. I then had to size the brass I used my redding comp. neck die w/ a .336 bushing that gives me .0015 in or so neck tension. Everythng else was the same as before except I did trim all the brass to a uniform 2.005 in. I found the flyers were gone and the accuracy realy came back. Anyone else had this happen?
