Thanks in advance for you guys help or advise.
I've been reloading for about three years. Since I bought my 21st century concentricity gauge, I check every round that i sized. My fire formed 308 Lapua brass average have 1 1/2 to 2 max thousandths of neck run out. After i sized with the Redding Bushing FL dies, it created more run out of the neck area. It created minimum of .007 to max .012 run out which is very excessive. I have taken the dies apart blasted with action cleaner and size another fire formed brass with same result of excessive run out. I bought new RCBS shell plate holder and use the new MEC free float shell holder press, it still produces more than .007 run out. After i research on google, I switch to Lee Collect Neck dies (i set it up correctly after i watch multiple youtube video and read few articles on forum). The Lee collet neck does reduce some run out, but 5 out of 10 Lee neck sized brass avg was 3~5 thousandths of run out. Then turned my Lapua brass with K&M turning tool to .014 and neck size again, it still at 3~5 thousandths of run out. I also seat my 185 jugg to empty case with Redding Micro seating die but the bullet run out is pretty much same .003~.005 of runoff. My goal is to achieve avg of .002 Neck and bullet run out or under for most of my brass. My current loads led me to average 1/2 ~ 3/4 moa with .010 bullet jump (above .005bullet run out) but my .020 Jam load average .3ish moa with same batch of case. Am I chasing a ghost? Any advise that i can achieve under .002 run out?
I've been reloading for about three years. Since I bought my 21st century concentricity gauge, I check every round that i sized. My fire formed 308 Lapua brass average have 1 1/2 to 2 max thousandths of neck run out. After i sized with the Redding Bushing FL dies, it created more run out of the neck area. It created minimum of .007 to max .012 run out which is very excessive. I have taken the dies apart blasted with action cleaner and size another fire formed brass with same result of excessive run out. I bought new RCBS shell plate holder and use the new MEC free float shell holder press, it still produces more than .007 run out. After i research on google, I switch to Lee Collect Neck dies (i set it up correctly after i watch multiple youtube video and read few articles on forum). The Lee collet neck does reduce some run out, but 5 out of 10 Lee neck sized brass avg was 3~5 thousandths of run out. Then turned my Lapua brass with K&M turning tool to .014 and neck size again, it still at 3~5 thousandths of run out. I also seat my 185 jugg to empty case with Redding Micro seating die but the bullet run out is pretty much same .003~.005 of runoff. My goal is to achieve avg of .002 Neck and bullet run out or under for most of my brass. My current loads led me to average 1/2 ~ 3/4 moa with .010 bullet jump (above .005bullet run out) but my .020 Jam load average .3ish moa with same batch of case. Am I chasing a ghost? Any advise that i can achieve under .002 run out?
