Is that a Dillon die thing? (He didn't actually say he's using Dillon dies.) I use Redding seating dies and they seem to be consistent no matter the profile. The variation I get is more to do with what is going on in the other stations.hovercat wrote:On powder variability, you are fine. The OAL can be better. Check your seating die to be certain that it fits the bullet profile.
You can remove the stem, place a bit of epoxy on it, and twirl a greased bullet until it dries to get a perfect fit.
Occasionally check for crud build up inside the dies, if you notice OAL getting shorter.
If I set my seating die, per mfg instructions, then run one piece of brass through to test it will repeat dead on every time. But when I start moving brass into every station the OAL will suddenly increase. Running the ram to the top and adjusting all the dies to touch the shell plate all but eliminates that issue but that is contrary to the press setup instructions.
The only way I've found to truly have every round come out precisely to the set OAL is on my single stage press.