mtwheelock@gmail.com
mtwheelock@gmail....
3 posts
Joined May 2017

Varying OAL in 9mm

I am pretty new to reloading on a progressive. I just got my XL750 set up last week. My first 100 rounds were a mess. My second 100 were better, but I am chasing the OAL around. My target is 1.150 OAL, but it is varying from 1.145 to about 1.165. To me that is a pretty big variance and visually noticeable. I am reaching out for ideas. The shellplate has a slight amount of play, which is the only thing I can think of. Thanks in advance for any assistance.
Fishobaby
Fishobaby
102 posts
Joined December 2017

RE: Varying OAL in 9mm

If you have the Dillon die set, are you aware that the seating stem can be turned-over? One side is for round nosed bullets and the other side is for flat nosed bullets.
mtwheelock@gmail.com
mtwheelock@gmail....
3 posts
Joined May 2017

RE: Varying OAL in 9mm

Yes, and I tried both sides. I stuck with the side for round nose as it kept these truncated cone bullets centered. Also, I don't think it is the stem as I have also tried a Hornady seating die with the same results.
lewmed@cox.net
lewmed@cox.net
10 posts
Joined February 2020

RE: Varying OAL in 9mm

Tighten your shell plate until it wont turn then back it off a bit. If that doesn't work there is a guy named Wobbly on the CZ forum that can make you a seating plug to fit your bullet. I've used JB weld to make a seating plug fit and it worked for several thousand rounds.
mtwheelock@gmail.com
mtwheelock@gmail....
3 posts
Joined May 2017

RE: Varying OAL in 9mm

I tightened up the shell plate, adjusted the seating die, and ran another batch of 100. This batch was the best so far, and the overall lengths were centered around my 1.150" target length (the mean was 1.1497"). They still varied .016" from the shortest to the longest in the batch. Maybe that is the best I can hope for?